Abstract:
Disclosed is a dishwasher comprising: a tub for containing dishes; a nozzle assembly for ejecting washing water; a vane assembly for changing the path of the washing water, while moving from a first position to a second position inside the tub, such that the ejected washing water is directed towards the dishes; and a controller for stopping the vane assembly, changing the movement speed of the vane assembly, or changing the movement direction of the vane assembly while the vane assembly moves from the first position to the second position, wherein the washing water can also be ejected to corner portions of the tub.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a U.S. national stage application of PCT international application PCT/KR2014/013017, filed on Dec. 30, 2014 and claims the benefit of Korean Patent Application No. 10-2013-0169375, filed on Dec. 31, 2013, respectively, the contents are incorporated herein by reference. 
     
    
     BACKGROUND 
       [0002]    1. Technical Field 
         [0003]    The present disclosure is related to a dishwasher and a control method thereof, and more particularly, to a dishwasher including a vane that changes a trajectory of sprayed washing water toward dishes and a control method thereof. 
         [0004]    2. Background Art 
         [0005]    In general, a dishwasher is an apparatus that sprays high pressure washing water to dishes, washes the dishes, and conventionally performs a washing process and a rinsing process. In the washing process, the washing water is sprayed and a detergent is supplied at the same time by a detergent supply device to wash the dishes. 
         [0006]    In general, a dishwasher includes a cabinet in which a washing tub is provided therein, a pump that generates a pressure of washing water, a basket installed therein to accommodate dishes and move forward and backward in the washing tub, nozzle assemblies which spray the washing water toward the dish basket, connecting flow paths which connect the pump and the nozzle assemblies, and flow path switching valves configured to selectively move the washing water from the pump to a plurality of nozzle assemblies, wherein the washing water sprayed by the nozzle assemblies washes the dishes. 
         [0007]    Conventionally, the nozzle assemblies are rotary type nozzle assemblies positioned above and under an upper dish basket, and above a lower dish basket. Such a rotary type spray unit is rotated by a reaction of spraying high pressure washing water. However, when the nozzle assemblies are provided to rotate, there are dead zones where the washing water cannot reach at corners of a washing tub provided in a quadrangular shape. 
       SUMMARY 
       [0008]    One embodiment of the present disclosure is directed to providing a dishwasher that sprays washing water to corners of a tub and a control method thereof. 
         [0009]    Another embodiment of the present disclosure is directed to providing a dishwasher that improves dishwashing capability and a control method thereof. 
         [0010]    Still another embodiment of the present disclosure is directed to providing a dishwasher that lessens noise due to dishwashing. 
         [0011]    One aspect of the present invention provides a dishwasher including a tub that accommodates a dish, a nozzle assembly that sprays washing water, a vane assembly that changes a trajectory of the washing water so that the sprayed washing water faces the dish while moving from a first position to a second position in the tub, and a controller that stops the vane assembly, changes a movement speed of the vane assembly, or changes a movement direction of the vane assembly while the vane assembly is moving from the first position and the second position. 
         [0012]    When the vane assembly reaches the second position, the controller may move the vane assembly from the second position to the first position. 
         [0013]    The controller may control the vane assembly to move the vane assembly for a first time duration in a forward direction and for a second time duration in a backward direction. 
         [0014]    The first time duration may be less than a reference time for which the vane assembly moves from the first position to the second position. 
         [0015]    The second time duration may be less than the first time duration. 
         [0016]    The controller may control the vane assembly to move the vane assembly for a third time duration and to stop the vane assembly for a fourth time duration. 
         [0017]    The third time duration may be less than a reference time for which the vane assembly moves from the first position to the second position. 
         [0018]    The vane assembly may change the trajectory of the washing water toward a dish accommodated at a position corresponding to the nozzle assembly when positioned in a vane rotation section. 
         [0019]    When the vane assembly is positioned in the vane rotation section, the controller may control the vane assembly to repeat moving and stopping of the vane assembly. 
         [0020]    When the vane assembly is positioned in the vane rotation section, the controller may reduce the movement speed of the vane assembly. 
         [0021]    When the vane assembly moves forward and backward between the first position and the second position, the controller may control the vane assembly to move the vane assembly forward and backward in the vane rotation section. 
         [0022]    The dishwasher may further include a vibration detector that detects a vibration of the dishwasher 
         [0023]    When the vibration of the dishwasher is a reference value or more, the controller may move the vane assembly from the first position to a third position. 
         [0024]    The nozzle assembly may include a plurality of spray nozzles and a distribution valve that distributes the washing water to the plurality of spray nozzles. 
         [0025]    When a distribution of the washing water by the distribution valve is changed, the controller may control the vane assembly to be positioned within a predetermined distance from the nozzle assembly. 
         [0026]    Another aspect of the present invention provides a control method of a dishwasher including moving a vane assembly that changes a trajectory of washing water sprayed by a nozzle assembly from a first position to a second position, wherein the moving of the vane assembly from the first position to the second position includes, stopping the vane assembly, changing a movement speed of the vane assembly, or changing a movement direction of the vane assembly. 
         [0027]    The control method may further include moving the vane assembly from the second position to the first position when the vane assembly reaches the second position. 
         [0028]    The moving of the vane assembly from the first position to the second position may include moving the vane assembly for a first time duration in a forward direction, and moving the vane assembly for a second time duration in a backward direction. 
         [0029]    The first time duration may be less than a reference time for which the vane assembly moves from the first position to the second position. 
         [0030]    The second time duration may be less than the first time duration. 
         [0031]    The moving of the vane assembly from the first position to the second position may include moving the vane assembly for a third time duration, and stopping the vane assembly for a fourth time duration. 
         [0032]    The third time duration may be less than a reference time for which the vane assembly moves from the first position to the second position. 
         [0033]    A vane movement section between the first position and the second position may include a vane rotation section in which the vane assembly changes the trajectory of the washing water toward a dish accommodated at a position corresponding to the nozzle assembly. 
         [0034]    The control method may further include repeating moving and stopping of the vane assembly when the vane assembly is positioned in the vane rotation section. 
         [0035]    The control method may further include reducing the movement speed of the vane assembly when the vane assembly is positioned in the vane rotation section. 
         [0036]    According to one embodiment of the present disclosure, a dishwasher including a vane that changes a trajectory of washing water while moving between one side and the other side of a tub can also spray washing water to corner portions of the tub. 
         [0037]    According to another embodiment of the present disclosure, dishwashing capability can be improved by controlling a movement, a movement direction, and a movement speed of the vane. 
         [0038]    According to still another embodiment of the present disclosure, noise due to dishwashing can be lessened by changing a movement section of the vane. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0039]      FIG. 1  is a view illustrating a dishwasher according to one embodiment. 
           [0040]      FIG. 2  is a view illustrating a lower portion of the dishwasher according to one embodiment. 
           [0041]      FIG. 3  is a view illustrating a structure of the dishwasher according to one embodiment. 
           [0042]      FIG. 4  is a view illustrating a configuration of a vane assembly and a vane driving assembly included in the dishwasher according to one embodiment. 
           [0043]      FIG. 5  is a view illustrating the configuration of the vane assembly included in the dishwasher according to one embodiment. 
           [0044]      FIG. 6  is a view illustrating a configuration of a belt and a belt holder included in the dishwasher according to one embodiment. 
           [0045]      FIG. 7  is a view illustrating a configuration of a bottom plate cover of the dishwasher according to one embodiment. 
           [0046]      FIG. 8  is a view illustrating a vane guide and a fixed nozzle assembly fixed to the bottom plate cover included in the dishwasher according to one embodiment. 
           [0047]      FIG. 9  is a view illustrating a control flowchart of the dishwasher according to one embodiment. 
           [0048]      FIG. 10  is a view illustrating one example of a position detector included in the dishwasher according to one embodiment. 
           [0049]      FIGS. 11 and 12  are views illustrating movements of the vane assembly included in the dishwasher according to one embodiment. 
           [0050]      FIG. 13  is a view illustrating a vane initialization method according to one embodiment. 
           [0051]      FIG. 14  is a view illustrating a vane movement method according to one embodiment. 
           [0052]      FIG. 15  is a view illustrating a vane movement method according to another embodiment. 
           [0053]      FIG. 16  is a view illustrating a vane movement method according to still another embodiment. 
           [0054]      FIGS. 17 and 18  are views illustrating rotational operations of a vane included in the dishwasher according to one embodiment. 
           [0055]      FIG. 19  is a view illustrating a vane movement method according to yet another embodiment. 
           [0056]      FIG. 20  is a view illustrating a vane movement method according to yet another embodiment. 
           [0057]      FIG. 21  is a view illustrating a vane movement method according to yet another embodiment. 
           [0058]      FIG. 22  is a view illustrating a trajectory of washing water when dishes are not accommodated at a side of a door of the dishwasher according to one embodiment. 
           [0059]      FIG. 23  is a view illustrating a vane movement method according to yet another embodiment. 
           [0060]      FIG. 24  is a view illustrating a vane movement method according to yet another embodiment. 
           [0061]      FIG. 25  is a view illustrating a trajectory of washing water when a distribution mode of the dishwasher is changed according to one embodiment. 
           [0062]      FIG. 26  is a view illustrating a vane movement method according to yet another embodiment. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0063]    Embodiments described in this specification and configurations illustrated in drawings are only exemplary examples of the disclosed disclosure, and the disclosure covers variously modified embodiments that can substitute for the embodiments herein and drawings at the time of filing of this application. 
         [0064]    Hereinafter, a dishwasher according to one embodiment will be described in detail with reference to the accompanying drawings. 
         [0065]      FIG. 1  is a view illustrating a dishwasher according to one embodiment, and  FIG. 2  is a view illustrating a lower portion of the dishwasher according to one embodiment. 
         [0066]    First, a schematic configuration of a dishwasher  1  will be described with reference to  FIGS. 1 and 2 . 
         [0067]    The dishwasher includes a main body  10  forming an exterior thereof, a tub provided in the main body  10 , baskets  12   a  and  12   b  provided in the tub  30  to store dishes, rotary spray nozzles  61  and  63  and a fixed nozzle assembly  300  that spray washing water, a sump  50  which stores washing water, a circulation pump  51  that supplies washing water in the sump  50  to the rotary spray nozzles  61  and  63  and the fixed nozzle assembly  300 , a distribution valve assembly  200  that distributes washing water to the rotary spray nozzle  61  and  63  and the fixed nozzle assembly  300 , a drain pump  52  that discharges the washing water in the sump  50  with scraps to the outside of the main body  10 , a vane assembly  400  that reflects washing water toward dishes while moving in the tub  30 , and a vane driving assembly  500  that drives the vane assembly  400 . 
         [0068]    The tub  30  may have a box shape in which the front is opened to deposit or withdraw dishes. The open front of the tub  30  may be opened and closed by a door  11 . The tub  30  may include an upper wall  31 , a rear wall  32 , a left wall  33 , a right wall  34 , and a bottom plate  35 . 
         [0069]    The baskets  12   a  and  12   b  may be wire racks formed with wires through which washing water passes not to be collected therein. The baskets  12   a  and  12   b  may be detachably provided in the tub. The baskets  12   a  and  12   b  may include an upper basket  12   a  disposed at an upper portion of the tub  30  and a lower basket  12   b  disposed at a lower portion of the tub  30 . 
         [0070]    The rotary spray nozzles  61  and  63  may spray washing water at a high pressure to wash dishes and include an upper rotary nozzle  61  provided at the upper portion of the tub  30  and a central rotary nozzle  63  provided at a central portion of the tub  30 . 
         [0071]    The rotary spray nozzles  61  and  63  spray washing water through spray holes  62  and  64  respectively formed at the upper rotary nozzle  61  and the central rotary nozzle  63 , and rotate by a reaction of spraying the washing water. 
         [0072]    The fixed nozzle assembly  300  is provided at a lower portion so as not to move unlike the rotary spray nozzles  61  and  63 , and is fixed to one side of the tub  30 . The fixed nozzle assembly  300  may be disposed adjacent to the rear wall  32  of the tub  30  and may spray washing water toward the front of the tub  30 . Accordingly, the washing water sprayed by the fixed nozzle assembly  300  may not be directly sprayed toward dishes. 
         [0073]    Such a fixed nozzle assembly  300  may include a left fixed nozzle  330  disposed at a left side of the tub  30  and a right fixed nozzle  340  disposed at a right side of the tub  30 . 
         [0074]    Washing water sprayed by the fixed nozzle assembly  300  may be reflected toward dishes by a vane assembly  400 . The fixed nozzle assembly  300  may be disposed below the lower basket  12   b  and the vane assembly  400  may reflect washing water sprayed by the fixed nozzle assembly  300  upward. 
         [0075]    The vane assembly  400  may include a vane  410  lengthily extending in left and right directions of the tub  30  to reflect all washing water sprayed by the fixed nozzle assembly  300 . Such a vane  410  may linearly move forward and backward in a direction of washing water being sprayed by the fixed nozzle assembly  300 . That is, the vane  410  may linearly move forward and backward in forward and backward directions of the tub  30 . 
         [0076]    Accordingly, a linear spray structure including the fixed nozzle assembly  300  and the vane assembly  400  may wash an entire area of the tub  30  with no dead zones. 
         [0077]    The distribution valve assembly  200  distributes washing water so that the rotary spray nozzles  61  and  63  and the fixed nozzle assembly  300  may independently spray the washing water. Furthermore, the distribution valve assembly  200  distributes the washing water so that the left fixed nozzle  330  and the right fixed nozzle  340  of the fixed nozzle assemble  300  may also independently spray the washing water. 
         [0078]    Accordingly, the dishwasher may independently and separately wash the left and right sides of the tub  30 . However, unlike one embodiment, the dishwasher may also subdivide the tub  30  as necessary as well as dividing the tub  30  only into the left and the right of the tub  30 . 
         [0079]    Hereinafter main components of the dishwasher according to one embodiment will be described in order. 
         [0080]      FIG. 3  is a view illustrating a structure of the dishwasher according to one embodiment. 
         [0081]    Referring to  FIG. 3 , the sump  50 , the circulation pump  51 , the distribution valve assembly  200 , the fixed nozzle assembly  300  and the rotary spray nozzles  61  and  63  are involved in circulating and spraying washing water. 
         [0082]    The washing water sprayed by the fixed nozzle assembly  300  or the rotary spray nozzles  61  and  63  is accommodated in the sump  50 , and the washing water accommodated in the sump  50  is pumped to the distribution valve assembly  200  by the circulation pump  51 . 
         [0083]    The distribution valve assembly  200  distributes the washing water pumped by the circulation pump  51  to the rotary spray nozzles  61  and  63 , the left fixed nozzle  330 , and the right fixed nozzle  340 . 
         [0084]    In addition, the distribution valve assembly  200  may be operated in a plurality of distribution modes for distributing washing water. For example, the distribution valve assembly  200  may be operated in first, second, third, and fourth distribution modes, and in the first distribution mode, the distribution valve assembly  200  may distribute washing water only to the rotary spray nozzles  61  and  63  through a second hose  271   b . In the second distribution mode, the distribution valve assembly  200  may distribute washing water only to the right fixed nozzle  340  through a third hose  271   c . In the third distribution mode, the distribution valve assembly  200  may distribute washing water only to the left and right fixed nozzles  330  and  340  through a first hose  271   a  and the third hose  271   c . In the fourth distribution mode, the distribution valve assembly  200  may distribute washing water only to the left fixed nozzle  330  through the first hose  271   a.    
         [0085]    Washing water distributed to the rotary spray nozzles  61  and  63  is sprayed toward dishes by the rotary spray nozzles  61  and  63  to wash the dishes. In addition, washing water distributed to the left and right fixed nozzles  330  and  340  is sprayed toward the vane assembly  400  by the left and right fixed nozzles  330  and  340  and is reflected by the vane assembly  400  to washes the dishes. 
         [0086]    The washing water that washed the dishes is accommodated in the sump  50  again. 
         [0087]    Such washing water circulates through the sump  50 , the circulation pump  51 , the distribution valve assembly  200 , the rotary spray nozzles  61  and  63 , and the fixed nozzle assembly  300 . 
         [0088]      FIG. 4  is a view illustrating a configuration of a vane assembly and a vane driving assembly included in the dishwasher according to one embodiment,  FIG. 5  is a view illustrating the configuration of the vane assembly included in the dishwasher according to one embodiment, and  FIG. 6  is a view illustrating a configuration of a belt and a belt holder included in the dishwasher according to one embodiment. 
         [0089]    Referring to  FIGS. 4 to 6 , the dishwasher includes the vane assembly  400  that reflects washing water sprayed by the fixed nozzle assembly  300  and the vane driving assembly  500  that linearly moves the vane assembly  400  forward and backward. 
         [0090]    The vane driving assembly  500  includes a vane guide  510  that guides the movement of the vane assembly  400 , a vane driving motor  520  that generates a rotational force for moving the vane assembly  400 , a drive pulley  530  coupled to a drive shaft  521  of the vane driving motor  520  to rotate, a belt  540  that is connected to the drive pulley  530 , rotates, and is disposed at an inner space of the vane guide  510 , and a driven pulley  550  connected to the belt  540  to rotatably support the belt  540 . 
         [0091]    The vane guide  510  may be provided lengthily extending in forward and backward directions at a central portion between the left and right walls  33  and  34  of the tub  30 . 
         [0092]    The vane guide  510  includes a guide rail  511  in a tubular shape in which an inner space and an open lower portion are formed, a rear holder  512  that rotatably supports the drive pulley  530  and is coupled to a rear end portion of the guide rail  511 , and a front holder  513  that rotatably supports the driven pulley  550  and is coupled to a front end portion of the guide rail  511 . 
         [0093]    The guide rail  511  is provided lengthily extending in forward and backward directions at the central portion between the left and right walls  33  and  34  of the tub  30 , and the inner space and the lower opening of the guide rail  511  may extend from one end portion to the other end portion in a lengthwise direction of the vane guide  510 . 
         [0094]    A coupling hole  512   a  that is formed to couple the vane guide  510  to a bottom plate cover  600  (see  FIG. 7 ) that will be described below may be formed at the rear holder  512 . 
         [0095]    The belt  540  is disposed at the inner space formed in the guide rail  511 , and forms a closed curve by being wound around the drive pulley  530  and the driven pulley  550 . In addition, when the vane driving motor  520  is driven, the belt  540  may rotate in a rotation direction of the vane driving motor  520 . 
         [0096]    Such a belt  540  may be formed of a resin material including aramid fibers in consideration of tensile strength, cost, and the like. 
         [0097]    Teeth  541  that transmit a driving force of the belt  540  may be formed at an inner side surface of the belt  540 , and the teeth  541  of the belt  540  may transmit the driving force to the vane assembly  400 . 
         [0098]    The vane assembly  400  includes the vane  410  that reflects washing water sprayed by the fixed nozzle assembly  300 , a belt holder  420  that receives the driving force from the belt  540 , and a vane holder  430  coupled to the belt holder  420  and the vane  410 . 
         [0099]    The vane  410  may be provided lengthily extending in a direction perpendicular to the vane guide  510 . 
         [0100]    The vane  410  may include a reflector  411  that reflects washing water sprayed by the fixed nozzle assembly  300 , a cap  414  provided at a central portion of the reflector  411  in a lengthwise direction thereof, a roller  417  with which the vane  410  moves smoothly, and a rotation hook  419  provided to interfere with a rotation guide  610  of the bottom plate cover  600  that will be described below. 
         [0101]    The reflector  411  includes reflective surfaces  412   a  and  412   b  obliquely provided to reflect washing water. The reflective surfaces  412   a  and  412   b  may include the first reflective surface  412   a  and the second reflective surface  412   b  that have inclinations different from each other and are alternately arranged in a lengthwise direction so that reflection angles of washing water are different from each other. 
         [0102]    The cap  414  may include a coupling groove  415  for being coupled to the vane holder  430 , and a rotation stopper  418  that limits a rotational range of the vane  410  when the vane  410  that will be described below is rotated by the rotation guide  610  (see  FIG. 7 ) of the bottom plate cover  600  (see  FIG. 7 ). 
         [0103]    A coupling protrusion  433  of the vane holder  430  may be coupled to the coupling groove  415  of the cap  414 . Specifically, the coupling protrusion  433  may be inserted into the coupling groove  415  of the vane  400 . The coupling protrusion  433  may rotatably support the vane  410 . 
         [0104]    The belt holder  420  may be disposed in an inner space  441  of the guide rail  511  similar to the belt  540 , and may be coupled to the teeth  541  of the belt  540  to move with the belt  540 . To this end, the belt holder  420  may include a teeth coupling portion  421  coupled to the teeth  541  of the belt holder  420 . 
         [0105]    In addition, the belt holder  420  may include legs  422  and  423  that are supported by the guide rail  511 . The legs  422  and  423  may be side legs  422  that protrude in a side direction and are supported by a side wall of the guide rail  511  and lower legs  423  that protrude downward and are supported by a lower wall of the guide rail  511 . 
         [0106]    The vane holder  430  is coupled to the belt holder  420 , moves with the belt holder  420 , and transmits a driving force of the belt holder  420  to the vane  410 . The vane holder  430  is provided to cover an outer surface of the guide rail  511 . 
         [0107]    The vane holder  430  may be coupled to the vane holder  420  through the lower opening of the guide rail  511 , and the coupling protrusion  433  to which the vane  410  is detachably coupled may be formed at the vane holder  430 . 
         [0108]      FIG. 7  is a view illustrating a configuration of a bottom plate cover of the dishwasher according to one embodiment, and  FIG. 8  is a view illustrating a vane guide and a fixed nozzle assembly fixed to the bottom plate cover included in the dishwasher according to one embodiment. 
         [0109]    As illustrated in  FIG. 7 , the bottom plate cover  600  is provided to couple to one rear side of the bottom plate  35  of the tub  30 . Such a bottom plate cover  600  seals a driving motor through hole  37  and flow path through holes  38  formed on the bottom plate  35 , and performs a function of fixing the vane guide  510  and the fixed nozzle assembly  300  of the dishwasher  1 . 
         [0110]    A bottom plate protrusion  36  that protrudes so that the bottom plate cover  600  is coupled thereto may be formed at a rear of the bottom plate  35 . 
         [0111]    The driving motor through hole  37  through which the vane driving motor  520  for driving the vane assembly  400  passes and the flow path through holes  38  through which flow paths that connect the fixed nozzle assembly  300  and the distribution valve assembly  200  pass may be formed on the bottom plate protrusion  36 . 
         [0112]    The bottom plate cover  600  is pressed against and coupled to a top surface of the bottom plate protrusion  36 . 
         [0113]    The bottom plate cover  600  includes a shaft through hole  640  through which the drive shaft  521  of the vane driving motor  520  passes, hose connection portions  652   a ,  652   b , and  652   c  inserted into the flow path through holes  38  of the bottom plate protrusion  36 , nozzle inlet hole connection portions  651   a ,  651   b , and  651   c  that protrude upward to be connected to the inlet holes  65 ,  333 , and  343  of the rotary spray nozzles  61  and  63  and the fixed nozzle assembly  300 , coupling holes  620  for fixing the fixed nozzle assembly  300  and the vane guide  510 , and the rotation guide  610  protruding to guide rotation of the vane  410 . 
         [0114]    Fixing caps  680  are coupled to the hose connection portions  652   a ,  652   b , and  652   c  of the bottom plate cover  600  so that the bottom plate cover  600  may be fixed to the bottom plate protrusion  36 . 
         [0115]    The shaft through hole  640  of the bottom plate cover  600  guides the drive shaft  521  of the vane driving motor  520  to protrude toward an inside of the tub  30 . 
         [0116]    A sealing member  670  may be provided between the bottom plate cover  600  and the bottom plate protrusion  36  so that washing water in the tub  30  does not leak through the driving motor through hole  37  and the flow path through holes  38  of the bottom plate protrusion  36 . 
         [0117]    As illustrated in  FIG. 8 , the vane guide  510  and the nozzle assembly  300  may be coupled to the bottom plate cover  600 . The bottom plate cover  600 , the vane guide  510 , and the nozzle assembly  300  may be firmly coupled by a coupling member  690 . To this end, coupling holes  620 ,  512 , and  347  may be respectively formed on the bottom plate cover  600 , the nozzle assembly  300 , and the vane guide  510  at corresponding positions thereof. 
         [0118]      FIG. 9  is a view illustrating a control flowchart of the dishwasher according to one embodiment, and  FIG. 10  is a view illustrating one example of a position detector included in the dishwasher according to one embodiment. 
         [0119]    Referring to  FIG. 9 , the dishwasher  1  may include an input portion  110 , a display  120 , a driver  140 , the vane driving motor  520 , the circulation pump  51 , the drain pump  52 , a storage  150 , and a controller  100 . In addition, the dishwasher  1  may further optionally include a position detector  130 . 
         [0120]    The input portion  110  may include an input button that receives control commands of a user to the dishwasher  1 . Such an input button may adopt a micro switch, a membrane switch, a touch pad, or the like. 
         [0121]    The display  120  may include a display panel that displays operation information of the dishwasher  1 . The display panel may adopt a liquid crystal display (LCD) panel, a light emitting diode (LED) panel, or an organic light emitting diode (OLED) panel. 
         [0122]    The driver  140  drives each component included in the dishwasher  1  according to control commands of the controller  100 . Specifically, The driver  140  may include a motor driving circuit (not shown) that drives the vane driving motor  520 , a pump driving circuit (not shown) that drives the circulation pump  51 , and a pump driving circuit (not shown) that drives the drain pump  52 . 
         [0123]    The vane driving motor  520  generates a rotational force for moving the vane assembly  400 . Such a vane driving motor  520  may adopt a direct current (DC) motor, an alternating current (AC) motor, or a stepping motor capable of rotating in both directions of the clockwise and counterclockwise directions. However, the vane driving motor  520  is not limited thereto, and may adopt any motor capable of rotating in both directions or a single direction. 
         [0124]    The storage  150  may not only include nonvolatile memories (not shown) such as a magnetic disc and a solid state disk that store programs and data for controlling an operation of the dishwasher  1 , and volatile memories (not shown) such as a dynamic random access memory (D-RAM), but also a static random success memory (S-RAM) that temporarily stores temporary data generated when the operation of the dishwasher  1  is controlled. 
         [0125]    The controller  100  controls operations of components included in the dishwasher  1 . Specifically, the controller  100  outputs control signals to control the vane driving motor  520 , the circulation pump  51 , and the drain pump  52  on the basis of the control commands input through the input portion  110 . 
         [0126]    In addition, the dishwasher  1  may optionally include a vibration detector  170  that detects vibrations of the door  11  (see  FIG. 1 ). 
         [0127]    The vibration detector  170  may include a vibration sensor (not shown) provided at one side or a central portion of the door  11  (see  FIG. 1 ) to detect vibrations generated when washing water strikes the door  11  (see  FIG. 1 ). 
         [0128]    In addition, the dishwasher  1  may optionally include the position detector  130  that detects a position of the vane assembly  400  (see  FIG. 1 ). 
         [0129]    As illustrated in  FIG. 10 , the position detector  130  may include a position identification member  131  attached to the vane assembly  400  and a detection sensor  132  that detects the position identification member  131 . 
         [0130]    When the position detection sensor  132  detects the position identification member  131 , the position detector may  130  determine that the vane assembly  400  is positioned at a position of the position detection sensor  132 . 
         [0131]    For example, as illustrated in  FIG. 10 , when the position detection sensor  132  is positioned at a first position P 1  adjacent to the fixed nozzle assembly  300 , and the position detection sensor  132  detects the position identification member  131 , the position detector  130  may determine that the vane assembly  400  is positioned at the first position P 1 . 
         [0132]    The position identification member  131  and the position detection sensor  132  may adopt a permanent magnet and a hall sensor. That is, the hall sensor that detects a magnetic field may detect a position of the vane assembly  400  by detecting a magnetic field of the permanent magnet. 
         [0133]    In addition, the position identification member  131  and the position detection sensor  132  may include a protrusion protruding from the vane assembly  400 , a micro switch pressed by the protrusion, an infrared light source that emits infrared light, and an infrared light sensor that detects the infrared light. 
         [0134]    Although the position identification member  131  and the position detection sensor  132  are illustrated in  FIG. 10 , the position detector  130  may include only the position detection sensor  132 . For example, the position detection sensor  132  may adopt a capacitive proximity sensor that detects a change in electrostatic capacitance due to the vane assembly  400 , a ultrasonic wave sensor module that emits an ultrasonic wave and receives an ultrasonic wave reflected by the vane assembly  400 , and an infrared light sensor module that emits infrared light and receives infrared light reflected by the vane assembly  400 . 
         [0135]    Such a position detector  130  is just an optional component, and the dishwasher  1  may not include the position detector  130 . 
         [0136]    Hereinafter an operation of the dishwasher  1 , and more particularly, an operation of the vane assembly  400  (see  FIG. 1 ), will be described. 
         [0137]    First, an overall operation of the dishwasher  1  will be described. 
         [0138]    The dishwasher  1  may perform water supplying, washing, water draining, and drying processes. 
         [0139]    In the water supplying process, washing water may be supplied to an inside of the tub  30  through a water supply pipe (not sown). The washing water supplied to the tub  30  may flow toward and be stored in the sump  50  provided at the lower portion of the tub  30  due to a gradient of the bottom plate  35  of the tub  30 . 
         [0140]    In the washing process, the circulation pump  51  may be operated to pump the washing water in the sump  50 . The washing water pumped by the circulation pump  51  may be distributed to the rotary spray nozzles  61  and  63 , the left fixed nozzle  330 , and the right fixed nozzle  340  through the distribution valve assembly  200 . 
         [0141]    The washing water sprayed by the rotary spray nozzles  61  and  63 , the left fixed nozzle  330 , and the right fixed nozzle  340  may strike dishes to remove scraps and fall with the scraps to be stored again in the sump  50 . The circulation pump  51  pumps and recirculates the washing water stored in the sump  50 . In the washing process, the circulation pump  51  may repeat operating and stopping several times. During this process, the scraps which fell into the sump  50  with the washing water are collected by a filter installed in the sump  50  and remain in the sump  50  not to circulate into the spray nozzles  61 ,  63 , and  300 . 
         [0142]    In the water draining process, the drain pump  52  may be operated to drain the scraps and the washing water that remain in the sump  50  to the outside of the main body  10 . 
         [0143]    In the drying process, a heater (not shown) installed in the tub  30  may be operated to dry the dishes. 
         [0144]    Next, forward and backward movements of the vane assembly  400  will described. 
         [0145]      FIGS. 11 and 12  are views illustrating movements of the vane assembly included in the dishwasher according to one embodiment. 
         [0146]    Referring to  FIGS. 11 and 12 , the fixed nozzle assembly  300  is provided at one side of the tub  30 , and the vane guide  510  is provided extending from one side toward the other side of the tub  30  in which the fixed nozzle assembly  300  is provided. 
         [0147]    In addition, an inside of the tub  30  may be divided into a vane movement section  11  in which the vane assembly  400  may move and a vane no-movement section  12  in which the vane assembly  400  may not move due to the fixed nozzle assembly  300 . 
         [0148]    When both ends of the vane movement section  11  are referred to as a first position P 1  and a second position P 2 , the vane assembly  400  may move forward and backward between the first position P 1  provided at a side of the fixed nozzle assembly  300  and the second position P 2  provided at a side opposite the fixed nozzle assembly  300 . 
         [0149]    In other words, as illustrated in  FIG. 10 , the vane assembly  400  may move from the first position P 1  to the second position P 2  along the vane guide  510 , and move again from the second position P 2  to the first position P 1  along the vane guide  510 . 
         [0150]    In addition, when the vane assembly  400  approaches the first position P 1  to wash dishes accommodated in the vane no-movement section  12  where the vane assembly  400  does not move, the vane  410  included in the vane assembly  400  rotates. 
         [0151]    Accordingly, as the vane rotates near the first position P 1  where the fixed nozzle assembly  300  is positioned, the vane assembly  400  may reflect washing water sprayed by the fixed nozzle assembly  300  toward the dishes accommodated in the vane no-movement section  12 . 
         [0152]    Rotation of the vane  410  in a vane rotation section  13  will be described in detail below. 
         [0153]      FIG. 13  is a view illustrating a vane initialization method according to one embodiment. 
         [0154]    When the washing process of the dishwasher  1  is started, pressure of washing water sprayed by the fixed nozzle assembly  300  may not be immediately raised. Accordingly, when the washing process is started and the vane assembly  400  is positioned far away from the fixed nozzle assembly  300 , there is a concern that the washing water sprayed by the fixed nozzle assembly  300  may directly strike the bottom plate  35  of the tub  30 . 
         [0155]    To prevent this, the dishwasher  1  may position the vane assembly  400  at the first position P 1  through a vane initialization method  1000 . 
         [0156]    The vane initialization method  1000  will be described in detail with reference to  FIGS. 11, 12, and 13 . 
         [0157]    First, the dishwasher  1  determines whether the washing process is started ( 1010 ). This is for positioning the vane assembly  400  at the first position P 1  before the vane assembly  400  moves forward and backward between the first position P 1  and the second position P 2 . 
         [0158]    When the washing process is started (YES in  1010 ), the dishwasher  1  determines whether the vane assembly  400  is positioned at the first position P 1  ( 1020 ). 
         [0159]    Specifically, the dishwasher  1  may determine whether the vane assembly  400  is positioned at the first position P 1  according to whether the position detection sensor  132  (see  FIG. 10 ) positioned at the first position P 1  detects the position identification member  131  (see  FIG. 10 ). 
         [0160]    In other words, when the position detection sensor  132  (see  FIG. 10 ) detects the position identification member  131  (see  FIG. 10 ), the dishwasher  1  may determine that the vane assembly  400  is positioned at the first position P 1 . 
         [0161]    When the vane assembly  400  is not positioned at the first position P 1  (NO in  1020 ), the dishwasher  1  moves the vane assembly  400  in a first direction D 1  ( 1030 ). The first direction D 1  refers to a direction from any position toward the first position P 1 . 
         [0162]    Specifically, to move the vane assembly  400  in the first direction D 1 , the dishwasher  1  may rotate the driving motor  520  (see  FIG. 4 ) in a first rotation direction. 
         [0163]    When the vane assembly  400  is positioned at the first position P 1  (YES in  1020 ), the dishwasher  1  ends the vane initialization method  1000 . 
         [0164]    The vane initialization method  1000  illustrated in  FIG. 13  is performed when the washing process is started, but is not limited thereto. The vane initialization method that positions the vane at the first position P 1  may also be performed in the water supplying process before the washing process. 
         [0165]    In addition, although the vane initialization method  1000  in which the dishwasher  1  includes the position detector  130  is illustrated in  FIG. 13 , the method is not limited thereto. 
         [0166]    For example, to position the vane assembly  400  at the first position P 1 , the dishwasher  1  may move the vane assembly  400  in the first direction D 1  for a predetermined time, and may determine that the vane assembly  400  is positioned at the first position P 1  when the predetermined time is elapsed. 
         [0167]    As the dishwasher  1  performs such a vane initialization method  1000  in the washing process or the water supplying process, the dishwasher  1  may prevent the washing water sprayed by the fixed nozzle assembly  300  from directly striking the bottom plate  35  of the tub  30 , and may prevent noise and vibrations generated therefrom. 
         [0168]    To help understanding, a movement operation of the vane assembly  400  described below will be assumed that the vane assembly  400  starts the movement operation from the first position P 1 . 
         [0169]      FIG. 14  is a view illustrating a vane movement method according to one embodiment. 
         [0170]    One example of a vane movement method  1100  will be described with reference to  FIGS. 11, 12, and 14 . 
         [0171]    First, the dishwasher  1  moves the vane assembly  400  in a second direction D 2  ( 1110 ). The second direction D 2  refers to a direction from any position of the vane guide  510  toward the second position P 2 . 
         [0172]    Specifically, to move the vane assembly  400  in the second direction D 2 , the dishwasher  1  may operate the vane driving motor  520  (see  FIG. 4 ) in a second rotation direction. 
         [0173]    Then, the dishwasher  1  determines whether the vane assembly  400  reaches the second position P 2  ( 1120 ). The second position P 2  refers to one end of the vane movement section  11  (see  FIG. 13 ) in which the vane assembly  400  moves. For example, as illustrated in  FIG. 13 , the second position P 2  may be one end of a side opposite the fixed nozzle assembly  300  of both ends of the vane guide  510 . 
         [0174]    The dishwasher  1  may determine whether the vane assembly  400  reaches the second position P 2  through various methods. 
         [0175]    For example, the dishwasher  1  may determine whether the vane assembly  400  reaches the second position P 2  on the basis of an operation time of the vane driving motor  520  (see  FIG. 4 ). 
         [0176]    By dividing a distance between the first and second positions P 1  and P 2  (hereinafter, referred to as a first reference distance) by a movement speed of the vane assembly  400 , a time (hereinafter, referred to as a first reference time) for which the vane assembly  400  moves the first reference distance may be calculated. Here, the movement speed of the vane assembly  400  is calculated on the basis of a rotational speed of the vane driving motor  520  (see  FIG. 4 ) and a radius of the drive pulley  530  (see  FIG. 4 ). 
         [0177]    In other words, when the vane driving motor  520  (see  FIG. 4 ) is operated for the first reference time, the vane assembly  400  may move the first reference distance. 
         [0178]    The dishwasher  1  may determine whether the vane assembly  400  reaches the second position P 2  according to whether a time for which the vane assembly  400  moves in the second direction D 2  (a time for which the driving motor is operated in the second rotation direction) is the first reference time or more. 
         [0179]    Specifically, when the time for which the vane driving motor  520  (see  FIG. 4 ) is operated in the second rotation direction is the first reference time or more, the dishwasher  1  determines that the vane assembly  400  reaches the second position P 2 , and when the time for which the vane driving motor  520  (see  FIG. 4 ) is operated in the second rotation direction is less than the first reference time, the dishwasher  1  determines that the vane assembly  400  does not reach the second position P 2 . 
         [0180]    As another example, the dishwasher  1  may determine whether the vane assembly  400  reaches the second position P 2  on the basis of rotational displacement of the vane driving motor  520  (see  FIG. 4 ). 
         [0181]    When the vane driving motor  520  (see  FIG. 4 ) includes an encoder that detects rotational displacement, the dishwasher  1  may calculate a movement distance of the vane assembly  400  due to an operation of the vane driving motor  520  (see  FIG. 4 ). Specifically, a movement distance of the vane assembly  400  may be calculated on the basis of a product of the rotational displacement of the vane driving motor  520  (see  FIG. 4 ) detected by the encoder and a radius of the drive pulley  530  (see  FIG. 4 ). 
         [0182]    The dishwasher  1  may determine whether the vane assembly  400  reaches the second position P 2  according to whether the product of the rotational displacement by which the vane driving motor  520  (see  FIG. 4 ) rotates in the second rotation direction and the radius of the drive pulley  530  (see  FIG. 4 ) is the first reference distance or more. 
         [0183]    Specifically, when the product of the rotational displacement by which the vane driving motor  520  (see  FIG. 4 ) rotates in the second rotation direction and the radius of the drive pulley  530  (see  FIG. 4 ) is the first reference distance or more, the dishwasher  1  determines that the vane assembly  400  reaches the second position P 2 . In addition, when the product of the rotational displacement by which the vane driving motor  520  (see  FIG. 4 ) rotates in the second rotation direction and the radius of the drive pulley  530  (see  FIG. 4 ) is less than the first reference distance, the dishwasher  1  determines that the vane assembly  400  does not reach the second position P 2 . 
         [0184]    When the vane assembly  400  reaches the second position P 2  (YES in  1120 ), the dishwasher  1  moves the vane assembly  400  in the first direction D 1  ( 1130 ). Specifically, to move the vane assembly  400  in the first direction D 1 , the dishwasher  1  may operate the vane driving motor  520  (see  FIG. 4 ) in the first rotation direction (a rotation direction in which the vane assembly is moved in the first direction D 1 ). 
         [0185]    Then, the dishwasher  1  determines whether the vane assembly  400  reaches the first position P 1  ( 1140 ). 
         [0186]    The dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  through various methods. 
         [0187]    For example, the dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  according to whether a time for which the vane driving motor  520  (see  FIG. 4 ) rotates in the first direction D 1  is the first reference time or more. 
         [0188]    As another example, the dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  according to whether a product of a rotational displacement by which the vane driving motor  520  (see  FIG. 4 ) rotates in the first direction D 1  and a radius of the drive pulley  530  (see  FIG. 4 ) is the first reference distance or more when the vane driving motor  520  (see  FIG. 4 ) includes an encoder. 
         [0189]    As still another example, when the dishwasher  1  includes the position detector  130  (see  FIG. 9 ), the dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  according to whether the position detection sensor positioned at the first position P 1  detects a position identification member attached to the vane assembly  400 . 
         [0190]    When the vane assembly  400  does not reach the first position P 1  (NO in  1140 ), the dishwasher continuously moves the vane assembly  400  in the first direction D 1 . 
         [0191]    When the vane assembly  400  reaches the first position P 1  (YES in  1140 ), the dishwasher  1  finishes forward and backward movements of the vane assembly  400 . 
         [0192]    The dishwasher  1  may move the vane assembly  400  forward and backward between the first position P 1  and the second position P 2  by repeating such a vane movement method  1100 . 
         [0193]      FIG. 15  is a view illustrating a vane movement method according to another embodiment. 
         [0194]    A vane movement method  1200  illustrated in  FIG. 15  includes repeatedly moving in a forward direction (a direction in which the vane assembly finally moves) and a backward direction (a direction opposite to the direction in which the vane assembly  400  finally moves) of the vane assembly  400  while the vane assembly  400  is moving forward and backward between the first position P 1  and the second position P 2 . 
         [0195]    For example, when the vane assembly  400  moves from the first position P 1  to the second position P 2 , the dishwasher  1  may repeat the moving of the vane assembly  400  toward the second position P 2  in the forward direction for a predetermined time and the moving of the vane assembly toward the first position P 1  in the backward direction. 
         [0196]    At this point, by a time for which the vane assembly  400  is moved in the forward direction being greater than a time for which the vane is moved in the backward direction, the dishwasher  1  may move the vane assembly  400  in the forward direction. In other words, the dishwasher  1  may repeat the moving of the vane assembly  400  in the forward and backward directions until the vane assembly  400  reaches the second position P 2 . 
         [0197]    The vane movement method  1200  will be described in detail with reference to  FIGS. 11, 12, and 15 . 
         [0198]    First, the dishwasher  1  moves the vane assembly  400  in the second direction D 2  for a first time duration ( 1210 ). Specifically, the dishwasher  1  may operate the vane driving motor  520  (see  FIG. 4 ) for the first time duration in the second rotation direction. 
         [0199]    The first time duration may refer to a time for which the vane assembly  400  moves in the forward direction (here, the second direction D 2 ), and may be differently set according to the first reference time for which the vane assembly  400  moves from the first position P 1  to the second position P 2 . For example, when the first reference time is approximately 11 seconds, the first time duration may be set to approximately 3 seconds. 
         [0200]    Then, the dishwasher  1  moves the vane assembly  400  for a second time duration in the first direction D 1  ( 1220 ). Specifically, the dishwasher  1  may move the vane driving motor  520  (see  FIG. 4 ) for the second time duration in the first rotation direction. 
         [0201]    The second time duration may refer to a time for which the vane assembly  400  moves in the backward direction (here, the first direction D 1 ), and may be differently set according to a reference time and the first time duration. For example, when the reference time is 11 seconds and the first time duration is 3 seconds, the second time duration may be set to 1 second. That is, the second time duration may be set to be less than the first time duration. 
         [0202]    Then, the dishwasher  1  determines whether the vane assembly  400  reaches the second position P 2  ( 1230 ). 
         [0203]    The dishwasher  1  may determine whether the vane assembly  400  reaches the second position P 2  through various methods. 
         [0204]    For example, the dishwasher  1  may accumulate time differences between the first time duration and the second time duration, and may determine whether the vane assembly  400  reaches the second position P 2  according to whether the accumulated time is the first reference time or more. 
         [0205]    Specifically, when the accumulated time is the first reference time or more, the dishwasher  1  determines that the vane assembly  400  reaches the second position P 2 , and when the accumulated time is less than the first reference time, the dishwasher  1  determines that the vane assembly  400  does not reach the second position P 2 . 
         [0206]    As another example, when the dishwasher  1  includes an encoder attached to the vane driving motor  520  (see  FIG. 4 ), the dishwasher  1  may accumulate distance differences between a first distance that the vane assembly  400  moves in the forward direction and a second distance that the vane assembly  400  moves in the backward direction, and may determine whether the vane assembly  400  reaches the second position P 2  according to whether the accumulated distance is the first reference distance or more, which is a distance between the first position P 1  and the second position P 2 . 
         [0207]    Specifically, when the accumulated distance is the first reference distance or more, the dishwasher  1  determines that the vane assembly  400  reaches the second position P 2 , and when the accumulated distance is less than the first reference distance, the dishwasher  1  determines that the vane assembly  400  does not reach the second position P 2 . 
         [0208]    When the vane assembly  400  does not reach the second position (NO in  1230 ), the dishwasher  1  repeats forward and backward movements of the vane assembly  400 . 
         [0209]    When the vane assembly  400  reaches the second position P 2  (YES in  1230 ), the dishwasher  1  moves the vane assembly  400  for the first time duration in the first direction D 1  ( 1240 ). Specifically, the dishwasher  1  may operate the vane driving motor  520  (see  FIG. 4 ) for the first time duration in the first rotation direction. 
         [0210]    The first time duration may refer to a time for which the vane assembly  400  moves in the forward direction (here, the first direction D 1 ), and may be different from the first time duration in  1210 . 
         [0211]    Then, the dishwasher  1  moves the vane assembly  400  for the second time duration in the second direction D 2  ( 1250 ). Specifically, the dishwasher  1  may operate the vane driving motor  520  (see  FIG. 4 ) for the second time duration in the second rotation direction. 
         [0212]    The second time duration may refer to a time for which the vane assembly  400  moves in the backward direction (here, the second direction D 2 ), and may be different from the second time duration in  1220 . 
         [0213]    Then, the dishwasher  1  determines whether the vane assembly  400  reaches the first position P 1  ( 1260 ). 
         [0214]    The dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  through various methods. 
         [0215]    For example, the dishwasher  1  may accumulate time differences between the first time duration and the second time duration, and may determine whether the vane assembly  400  reaches the second position P 2  according to whether the accumulated time is the first reference time or more. 
         [0216]    As another example, when the dishwasher  1  includes an encoder attached to the vane driving motor  520  (see  FIG. 4 ), the dishwasher  1  may accumulate distance differences between the first distance that the vane assembly  400  moves in the forward direction and the second distance that the vane assembly  400  moves in the backward direction, and may determine whether the vane assembly  400  reaches the second position P 2  according to whether the accumulated distance is the first reference distance or more, which is a distance between the first position P 1  and the second position P 2 . 
         [0217]    As still another example, when the dishwasher  1  includes a position identification member attached to the vane assembly  400  and a position detection sensor provided at the first position P 1 , the dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  according to whether the position detection sensor provided at the first position P 1  detects the position identification member. 
         [0218]    When the vane assembly  400  does not reach the first position P 1  (NO in  1260 ), the dishwasher  1  repeats forward and backward movement of the vane assembly  400 . 
         [0219]    When the vane assembly  400  reaches the first position P 1  (YES in  1260 ), the dishwasher  1  finishes the movement of the vane assembly  400 . 
         [0220]    In the washing process, the dishwasher  1  may move the vane assembly  400  forward and backward between the first position P 1  and the second position P 2  by repeating such a vane movement method  1200 . 
         [0221]    In addition, the washing capability of the dishwasher  1  may be further improved by repeating forward and backward moving of the vane assembly  400  while the vane assembly  400  is moving forward and backward between the first position P 1  and the second position P 2 . 
         [0222]      FIG. 16  is a view illustrating a vane movement method according to still another embodiment. 
         [0223]    A vane movement method  1300  illustrated in  FIG. 16  includes repeating moving and stopping of the vane assembly  400  while the vane assembly  400  is moving forward and backward between the first position P 1  and the second position P 2 . 
         [0224]    For example, when the vane assembly  400  moves from the first position P 1  to the second position P 2 , the dishwasher  1  may repeat moving of the vane assembly  400  for a predetermined time toward the second position P 2  in the second direction D 2  and stopping the vane assembly  400  for a predetermined time. In other words, the dishwasher  1  may repeat moving and stopping of the vane assembly  400  until the vane assembly  400  reaches the second position P 2 . 
         [0225]    The vane movement method  1300  will be described in detail with reference to  FIGS. 11, 12, and 16 . 
         [0226]    First, the dishwasher  1  moves the vane assembly  400  in the second direction D 2  for a third time duration ( 1310 ). Specifically, the dishwasher  1  may operate the vane driving motor  520  (see  FIG. 4 ) for the third time duration in the second rotation direction. 
         [0227]    The third time duration may refer to a time for which the vane assembly  400  moves between the first position P 1  and the second position P 2 , and may be differently set according to the first reference time for which the vane assembly  400  moves between the first position P 1  and the second position P 2 . For example, when the first reference time is approximately 11 seconds, the third time duration may be set to approximately 2 seconds. 
         [0228]    Then, the dishwasher  1  stops the vane assembly  400  for a fourth time duration ( 1320 ). Specifically, the dishwasher  1  may stop the vane driving motor  520  (see  FIG. 4 ) for the fourth time duration. 
         [0229]    The fourth time duration may refer to a time for which the vane assembly  400  stops a movement, and may be differently set according to the first reference time and the third time duration. For example, when the first reference time is 11 seconds and the third time duration is 3 seconds, the fourth time duration may be set to approximately 1 second. 
         [0230]    Then, the dishwasher  1  determines whether the vane assembly  400  reaches the second position P 2  ( 1330 ). 
         [0231]    The dishwasher  1  may determine whether the vane assembly  400  reaches the second position P 2  through various methods. 
         [0232]    For example, the dishwasher  1  may accumulate the third time duration, and may determine whether the vane assembly  400  reaches the second position P 2  according to whether the accumulated time is the first reference time or more. 
         [0233]    Specifically, when the accumulated time is the first reference time or more, the dishwasher  1  determines that the vane assembly  400  reaches the second position P 2 , and when the accumulated time is less than the first reference time, the dishwasher  1  determines that the vane assembly  400  does not reach the second position P 2 . 
         [0234]    As another example, the dishwasher  1  may accumulate a distance that the vane assembly  400  moves, and may determine whether the vane assembly  400  reaches the second position P 2  according to whether the accumulated distance is the first reference distance or more. 
         [0235]    Specifically, when the accumulated distance is the first reference distance or more, the dishwasher  1  determines that the vane assembly  400  reaches the second position P 2 , and when the accumulated distance is less than the first reference distance, the dishwasher  1  determines that the vane assembly  400  does not reach the second position P 2 . 
         [0236]    When the vane assembly  400  does not reach the second position (NO in  1330 ), the dishwasher  1  repeats moving and stopping of the vane assembly  400  between the first position P 1  and the second position P 2 . 
         [0237]    When the vane assembly  400  reaches the second position P 2  (YES in  1330 ), the dishwasher  1  moves the vane assembly  400  for the third time duration in the first direction D 1  ( 1340 ). Specifically, the dishwasher  1  may operate the vane driving motor  520  (see  FIG. 4 ) for the third time duration in the first rotation direction. 
         [0238]    The third time duration may refer to a time for which the vane assembly  400  moves between the first position P 1  and the second position P 2 , and may be different from the third time duration in  1310 . 
         [0239]    Then, the dishwasher  1  stops the vane assembly  400  for the fourth time duration ( 1350 ). Specifically, the dishwasher  1  may stop the vane driving motor  520  (see  FIG. 4 ) for the fourth time duration. 
         [0240]    The fourth time duration may refer to a time for which the vane assembly  400  stops a movement, and may be different from the fourth time duration in  1320 . 
         [0241]    Then, the dishwasher  1  determines whether the vane assembly  400  reaches the first position P 1  ( 1360 ). 
         [0242]    The dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  through various methods. 
         [0243]    For example, the dishwasher  1  may accumulate the third time duration, and may determine whether the vane assembly  400  reaches the first position P 1  according to whether the accumulated time is the first reference time or more. 
         [0244]    As another example, when the dishwasher  1  includes an encoder attached to the vane driving motor  520  (see  FIG. 4 ), the dishwasher  1  may accumulate a distance that the vane assembly  400  moves, and may determine whether the vane assembly  400  reaches the first position P 1  according to whether the accumulated distance is the first reference distance or more. 
         [0245]    As still another example, when the dishwasher  1  includes a position identification member attached to the vane assembly  400  and a position detection sensor provided at the first position P 1 , the dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  according to whether the position detection sensor provided at the first position P 1  detects the position identification member. 
         [0246]    When the vane assembly  400  does not reach the first position P 1  (NO in  1360 ), the dishwasher  1  repeats moving and stopping of the vane assembly  400 . 
         [0247]    When the vane assembly  400  reaches the first position P 1  (YES in  1360 ), the dishwasher  1  finishes the movement of the vane assembly  400 . 
         [0248]    In the washing process, the dishwasher  1  may move the vane assembly  400  forward and backward between the first position P 1  and the second position P 2  by repeating such a vane movement method  1300 . 
         [0249]    In addition, the washing capability of the dishwasher  1  is further improved by repeating moving and stopping of the vane assembly  400  while the vane assembly  400  is moving forward and backward between the first position P 1  and the second position P 2 . 
         [0250]      FIGS. 17 and 18  are views illustrating rotational operations of a vane included in the dishwasher according to one embodiment. 
         [0251]    Referring to  FIGS. 17 and 18 , when the vane assembly  400  approaches the first position P 1  to wash dishes accommodated in the vane no-movement section  12  where the vane assembly  400  does not move, the vane  410  included in the vane assembly  400  rotates. 
         [0252]    A section in which the vane  410  rotates as described above refers to the vane rotation section  13 . In addition, a third position P 3  refers to a position at which the vane rotation section starts. In other words, the vane  410  rotates while the vane assembly  400  is moving in the vane rotation section  13  between the first position P 1  and the third position P 3 . 
         [0253]    The rotation guide  610  protruding to guide the movement of the vane  410  is formed on the bottom plate cover  600 , and the rotation hook  419  configured to interfere with the rotation guide  610  is formed at the vane  410 . The coupling protrusion  433  formed at the vane holder  430  serves as a rotational shaft of the vane  410 . 
         [0254]    In addition, the rotation guide  610  includes a guide surface  611  that is in contact with the rotation hook  419  and is formed as a curved surface so that the vane  410  smoothly rotates. 
         [0255]    When the vane assembly  400  reaches the third position P 3 , the vane assembly  400  moves in the first direction D 1 , and then, the rotation hook  419  of the vane  410  is pressed by the guide surface  611  of the rotation guide  610  of the bottom plate cover  600  as illustrated in  FIG. 17 . 
         [0256]    In addition, as the rotation hook  419  is pressed by the rotation guide  610 , the vane  410  rotates about the coupling protrusion  433  of the vane holder  430  as illustrated in  FIG. 18 . Such a rotation of the vane  410  continues until the cap  414  of the vane  410  is hooked at the vane guide  510 . 
         [0257]      FIG. 19  is a view illustrating a vane movement method according to yet another embodiment. 
         [0258]    Referring to  FIG. 13  again, by rotating the vane  410  while the vane assembly  400  is positioned in the vane rotation section  13 , dishes accommodated in the vane no-movement section  12  are washed. Accordingly, a time for which dishes positioned in the vane no-movement section  12  are washed is less than a time for which dishes positioned in the vane movement section  11  are washed. 
         [0259]    A vane movement method  1400  illustrated in  FIG. 19  includes the vane assembly  400  moving forward and backward in the vane movement section  11  (see  FIG. 13 ) and the vane assembly  400  additionally moving forward and backward in the vane rotation section  13  (see  FIG. 13 ) to improve capability of washing dishes positioned in the vane no-movement section  12 . 
         [0260]    The vane movement method  1400  will be described in detail with reference to  FIGS. 17, 18, and 19 . 
         [0261]    First, the dishwasher  1  moves the vane assembly  400  forward and backward between the first position P 1  and the second position P 2  ( 1410 ). 
         [0262]    Here, the forward and backward movements between the first position P 1  and the second position P 2  may be any one among the vane movement method  1100  illustrated in  FIG. 14 , the vane movement method  1200  illustrated in  FIG. 15 , or the vane movement method  1300  illustrated in  FIG. 16 . In addition, the forward and backward movements between the first position P 1  and the second position P 2  may also be a vane movement method excluding the vane movement methods  1100 ,  1200 , and  1300  respectively illustrated in  FIGS. 14, 15, and 16 . 
         [0263]    When the vane assembly  400  moves forward and backward between the first position P 1  and the second position P 2  and reaches the first position P 1 , the dishwasher  1  moves the vane assembly  400  in the second direction D 2  ( 1420 ). Specifically, to move the vane assembly  400  in the second direction D 2 , the dishwasher  1  may operate the vane driving motor  520  (see  FIG. 4 ) in the second rotation direction. 
         [0264]    Then, the dishwasher  1  determines whether the vane assembly  400  reaches the third position P 3  ( 1430 ). Here, the third position P 3  refers to a position at which the vane rotation section  13  starts as described above. 
         [0265]    The dishwasher  1  may determine whether the vane assembly  400  reaches the third position P 3  through various methods. 
         [0266]    For example, the dishwasher  1  may determine whether the vane assembly  400  reaches the third position P 3  according to whether a time for which the vane driving motor  520  rotates in the second rotation direction is equal to or greater than a time for which the vane assembly  400  moves between the first position P 1  and the third position P 3  (hereinafter, referred to as a second reference time). 
         [0267]    Specifically, when the time for which the vane driving motor  520  is rotated in the second rotation direction is the second reference time or more, the dishwasher  1  determines that the vane assembly  400  reaches the third position P 3 , and when the time for which the vane driving motor  520  is rotated in the second rotation direction is less than the second reference time, the dishwasher determines that the vane assembly  400  does not reach the third position P 3 . 
         [0268]    As another example, when the vane driving motor  520  (see  FIG. 4 ) includes an encoder that detects rotational displacement, whether the vane assembly  400  reaches the third position P 3  may be determined according to whether a product of a rotational displacement by which the vane driving motor  520  (see  FIG. 4 ) rotates in the second rotation direction and the radius of the drive pulley  530  (see  FIG. 4 ) is equal to or greater than a distance between the first position P 1  and the third position P 3  (hereinafter, referred to as a second reference distance). 
         [0269]    Specifically, when the product of the rotational displacement by which the vane assembly  400  rotates in the second rotation direction and the radius of the drive pulley  530  (see  FIG. 4 ) is the second reference distance or less, the dishwasher  1  determines that the vane assembly  400  reaches the third position P 3 . In addition, when the product of the rotational displacement by which the vane assembly  400  rotates in the second rotation direction and the radius of the drive pulley  530  (see  FIG. 4 ) is less than the second reference distance, the dishwasher  1  determines that the vane assembly  400  does not reach the third position. 
         [0270]    When the vane assembly  400  reaches the third position P 3  (YES in  1430 ), the dishwasher  1  moves the vane assembly  400  in the first direction D 1  ( 1440 ). Specifically, the dishwasher  1  may operate the vane driving motor  520  (see  FIG. 4 ) in the first rotation direction. 
         [0271]    Then, the dishwasher  1  determines whether the vane assembly  400  reaches the first position P 1  ( 1450 ). 
         [0272]    The dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  through various methods. 
         [0273]    For example, the dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  according to whether a time for which the vane driving motor  520  (see  FIG. 4 ) rotates in the first direction D 1  is the second reference time or more. 
         [0274]    As another example, when the vane driving motor  520  (see  FIG. 4 ) includes an encoder, the dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  according to whether the product of the rotational displacement by which the vane driving motor  520  (see  FIG. 4 ) rotates in the first direction D 1  and a radius of the drive pulley  530  in  FIG. 4  is the second reference distance or more. 
         [0275]    As still another example, when the dishwasher  1  includes the position detector  130  (see  FIG. 9 ), the dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  according to whether a position detection sensor positioned at the first position P 1  detects a position identification member attached to the vane assembly  400 . 
         [0276]    When the vane assembly  400  reaches the first position P 1  (YES in  1450 ), the dishwasher  1  finishes forward and backward movements of the vane assembly  400 . 
         [0277]    In the washing process, the dishwasher  1  may move the vane assembly  400  forward and backward between the first position P 1  and the second position P 2  and between the first position P 1  and the third position P 3  by repeating such a vane movement method  1400 . 
         [0278]    In addition, the washing capability in the vane no-movement section  12  (see  FIG. 12 ) may be improved by additionally moving the vane assembly  400  forward and backward in the vane rotation section  13 . 
         [0279]      FIG. 20  is a view illustrating a vane movement method according to yet another embodiment. 
         [0280]    A vane movement method illustrated in  FIG. 20  includes repeating moving and stopping of the vane assembly  400  in the vane rotation section  13  (see  FIG. 13 ) to improve capability of washing dishes accommodated in the vane no-movement section  12 . 
         [0281]    The vane movement method  1500  will be described in detail with reference to  FIGS. 17, 18, and 20 . 
         [0282]    First, the dishwasher  1  moves the vane assembly  400  in the second direction D 2  for a fifth time duration ( 1510 ). Specifically, the dishwasher  1  may operate the vane driving motor  520  (see  FIG. 4 ) for the fifth time duration in the second rotation direction. 
         [0283]    The fifth time duration may refer to a time for which the vane assembly  400  moves in the vane rotation section  13  in the forward direction (here, the second direction D 2 ), and may be differently set according to the second reference time for which the vane assembly  400  moves from the first position P 1  to the third position P 3 . However, for example, when the second reference time is approximately 0.5 seconds, the fifth time duration may be set to approximately 0.1 second. 
         [0284]    Then, the dishwasher  1  stops the vane assembly  400  for a sixth time duration ( 1520 ). Specifically, the dishwasher  1  may stop the vane driving motor  520  (see  FIG. 4 ) for the sixth time duration. 
         [0285]    The sixth time duration may refer to a time for which the vane assembly  400  stops a movement in the vane rotation section  13 , and may be differently set according to the second reference time and the fifth time duration. For example, when the second reference time is approximately 0.5 seconds and the fifth time duration is approximately 0.1 second, the sixth time duration may be set to approximately 0.1 second. 
         [0286]    Then, the dishwasher  1  determines whether the vane assembly  400  reaches the third position P 3  ( 1530 ). 
         [0287]    The dishwasher  1  may determine whether the vane assembly  400  reaches the third position P 3  through various methods. 
         [0288]    For example, the dishwasher  1  may accumulate the fifth time duration, and may determine whether the vane assembly  400  reaches the third position P 3  according to whether the accumulated time is the second reference time or more. 
         [0289]    As another example, the dishwasher  1  may accumulate a distance that the vane moves, and may determine whether the vane assembly  400  reaches the third position P 3  according to whether the accumulated distance is the second reference distance or more. 
         [0290]    When the vane assembly  400  does not reach the third position (NO in  1530 ), the dishwasher  1  repeats moving and stopping of the vane assembly  400  between the first position P 1  and the third position P 3 . 
         [0291]    When the vane assembly  400  reaches the third position P 3  (YES in  1530 ), the dishwasher  1  moves the vane assembly  400  forward and backward between the first position P 1  and the second position P 2  ( 1540 ). 
         [0292]    Here, the forward and backward movements between the third position P 3  and the second position P 2  may be one among the vane movement method  1100  illustrated in  FIG. 14 , the vane movement method  1200  illustrated in  FIG. 15 , or the vane movement method  1300  illustrated in  FIG. 16 . In addition, the forward and backward movements between the third position P 3  and the second position P 2  may also be a vane movement method excluding the vane movement methods  1100 ,  1200 , and  1300  respectively illustrated in  FIGS. 14, 15, and 16 . 
         [0293]    When the vane assembly  400  moves forward and backward between the third position P 3  and the second position P 2  and reaches the third position P 3 , the dishwasher  1  moves the vane assembly  400  for the fifth time duration in the first direction D 1  ( 1550 ). Specifically, the dishwasher  1  may operate the vane driving motor  520  (see  FIG. 4 ) for the fifth time duration in the first rotation direction. 
         [0294]    The fifth time duration may refer to a time for which the vane assembly  400  moves, and may be different from the fifth time duration in  1510 . 
         [0295]    Then, the dishwasher  1  stops the vane assembly for the sixth time duration ( 1560 ). Specifically, the dishwasher  1  may stop the vane driving motor  520  (see  FIG. 4 ) for the sixth time duration. 
         [0296]    The sixth time duration may refer to a time for which the vane assembly  400  stops a movement, and may be different from the sixth time duration in  1520 . 
         [0297]    Then, the dishwasher  1  determines whether the vane assembly  400  reaches the first position P 1  ( 1570 ). 
         [0298]    The dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  through various methods. 
         [0299]    For example, the dishwasher  1  may accumulate the fifth time duration, and may determine whether the vane assembly  400  reaches the first position P 1  according to whether the accumulated time is he second reference time or more. 
         [0300]    As another example, when the dishwasher  1  includes an encoder attached to the vane driving motor  520  (see  FIG. 4 ), the dishwasher  1  may accumulate a distance that the vane assembly  400  moves, and may determine whether the vane assembly  400  reaches the first position P 1  according to whether the accumulated distance is the second reference distance or more. 
         [0301]    As still another example, when the dishwasher  1  includes a position identification member attached to the vane assembly  400  and a position detection sensor provided at the first position P 1 , the dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  according to whether the position detection sensor provided at the first position P 1  detects the position identification member. 
         [0302]    When the vane assembly  400  does not reach the first position P 1  (NO in  1570 ), the dishwasher  1  repeats moving and stopping of the vane assembly  400  between the third position P 3  and the first position P 1 . 
         [0303]    When the vane assembly  400  reaches the first position P 1  (YES in  1570 ), the dishwasher  1  finishes the movement of the vane assembly  400 . 
         [0304]    In the washing process, the dishwasher  1  may move the vane assembly  400  forward and backward by repeating such a vane movement method  1500 . 
         [0305]    In addition, the dishwasher  1  may improve capability of washing dishes accommodated in the vane no-movement section  12  (see  FIG. 12 ) by repeating moving and stopping of the vane assembly  400  while the vane assembly  400  is moving forward and backward in the vane rotation section  13  (see  FIG. 12 ). 
         [0306]      FIG. 21  is a view illustrating a vane movement method according to yet another embodiment. 
         [0307]    A vane movement method  1600  illustrated in  FIG. 21  includes reducing a movement speed of the vane assembly  400  in the vane rotation section  13  (see  FIG. 13 ) to improve capability of washing dishes accommodated in the vane no-movement section  12 . 
         [0308]    The vane movement method  1600  will be described in detail with reference to  FIGS. 17, 18, and 21 . 
         [0309]    First, the dishwasher  1  sets a movement speed of the vane assembly  400  to a movement speed in the vane rotation section  13  (see  FIG. 12 ) (hereinafter, referred to as a second speed) ( 1610 ). 
         [0310]    Specifically, when the vane driving motor  520  (see  FIG. 4 ) is a DC motor, the dishwasher  1  may change the movement speed of the vane assembly  400  by changing a driving current level supplied to the vane driving motor  520  (see  FIG. 4 ). In addition, when the vane driving motor  520  (see  FIG. 4 ) is an AC motor, the dishwasher  1  may change the movement speed of the vane assembly  400  by changing a frequency of the driving current supplied to the vane driving motor  520  (see  FIG. 4 ). 
         [0311]    The second speed is a speed at which the vane assembly  400  moves in the vane rotation section  13  (see  FIG. 12 ), and it is preferable that the second speed be slower than a speed at which the vane moves in the vane movement section  11  (see  FIG. 12 ) excluding the vane rotation section  13  (see  FIG. 13 ) (hereinafter, referred to as a first speed). 
         [0312]    Then, the dishwasher  1  moves the vane assembly  400  in the second direction D 2  ( 1620 ). Specifically, the dishwasher  1  may operate the vane driving motor  520  (see  FIG. 4 ) in the second rotation direction. 
         [0313]    Then, the dishwasher  1  determines whether the vane assembly  400  reaches the third position P 3  ( 1630 ). 
         [0314]    The dishwasher  1  may determine whether the vane assembly  400  reaches the third position P 3  through various methods. 
         [0315]    For example, the dishwasher may determine whether the vane assembly  400  reaches the third position P 3  according to whether a time for which the vane driving motor  520  (see  FIG. 4 ) operates in the second rotation direction is equal to or greater than a value of the second reference distance divided by the second speed. 
         [0316]    As another example, when the vane driving motor  520  (see  FIG. 4 ) includes an encoder, the dishwasher  1  may determine whether the vane assembly  400  reaches the third position P 3  according to whether a product of a rotational displacement by which the vane driving motor  520  (see  FIG. 4 ) rotates in the second rotation direction and the radius of the drive pulley  530  (see  FIG. 4 ) is the second reference distance or more. 
         [0317]    When the vane assembly  400  reaches the third position P 3  (YES in  1630 ), the dishwasher  1  sets the movement speed of the vane assembly  400  to the first speed ( 1640 ). 
         [0318]    The first speed is a speed at which the vane assembly  400  moves in the vane movement section  11  (see  FIG. 12 ) excluding the vane rotation section  13  (see  FIG. 12 ), and it is preferable that the first speed be faster than the second speed. 
         [0319]    Then, the dishwasher  1  moves the vane assembly  400  forward and backward between the third position P 3  and the second position P 2  ( 1650 ). 
         [0320]    Here, the forward and backward movements between the third position P 3  and the second position P 2  may be one among the vane movement method  1100  illustrated in  FIG. 14 , the vane movement method  1200  illustrated in  FIG. 15 , or the vane movement method  1300  illustrated in  FIG. 16 . In addition, the forward and backward movements between the first position P 1  and the second position P 2  may also be a vane movement method excluding the vane movement methods  1100 ,  1200 , and  1300  respectively illustrated in  FIGS. 14, 15, and 16 . 
         [0321]    When the vane assembly  400  moves forward and backward between the third position P 3  and the second position P 2  and reaches the third position P 3 , the dishwasher  1  sets the movement speed of the vane assembly  400  to the second speed ( 1660 ). 
         [0322]    Then, the dishwasher  1  moves the vane assembly in the first direction D 1  ( 1670 ). Specifically, the dishwasher  1  may operate the vane driving motor  520  (see  FIG. 4 ) in the first rotation direction. 
         [0323]    Then, the dishwasher  1  determines whether the vane assembly  400  reaches the first position P 1  ( 1680 ). 
         [0324]    The dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  through various methods. 
         [0325]    For example, the dishwasher may determine whether the vane assembly  400  reaches the first position P 1  according to whether a time for which the vane driving motor  520  (see  FIG. 4 ) operates in the first rotation direction is equal to or greater than a value of the second reference distance divided by the second speed. 
         [0326]    As another example, when the vane driving motor  520  (see  FIG. 4 ) includes an encoder, whether the vane assembly  400  reaches the first position P 1  may be determined according to whether a product of a rotational displacement by which the vane driving motor  520  (see  FIG. 4 ) rotates in the first rotation direction and the radius of the drive pulley  530  (see  FIG. 4 ) is the second reference distance or more. 
         [0327]    As still another example, when the dishwasher  1  includes the position detector  130  (see  FIG. 9 ), the dishwasher  1  may determine whether the vane assembly  400  reaches the first position P 1  according to whether a position detection sensor positioned at the first position P 1  detects a position identification member attached to the vane assembly  400 . 
         [0328]    In the washing process, the dishwasher  1  may move the vane assembly  400  forward and backward by repeating such a vane movement method  1600 . 
         [0329]    In addition, the dishwasher  1  may improve capability of washing dishes accommodated in the vane no-movement section  12  (see  FIG. 12 ) by reducing a movement speed of the vane assembly  400  while the vane assembly  400  is moving in the vane rotation section  13  (see  FIG. 12 ). 
         [0330]      FIG. 22  is a view illustrating a trajectory of washing water when dishes are not accommodated at a side of a door of the dishwasher according to one embodiment. 
         [0331]    Referring to  FIG. 22 , when dishes are not accommodated near the door  11  of the dishwasher  1 , washing water reflected by the vane assembly  400  may directly strike the door  11 . 
         [0332]    When washing water reflected by the vane assembly  400  directly strikes the door  11 , there is a concern that vibrations and noise of the dishwasher  1  increase. Specifically, when the vane assembly  400  is positioned near the second position P 2 , there is high possibility of washing water reflected by the vane assembly  400  striking the door  11 . 
         [0333]    When dishes are not accommodated near the door  11 , the dishwasher  1  may move the vane assembly  400  to a position at which washing water reflected by the vane assembly  400  in the first position P 1  does not strike the door  11  (hereinafter, referred to as a fourth position). 
         [0334]      FIG. 23  is a view illustrating a vane movement method according to yet another embodiment. 
         [0335]    A vane movement method  1700  illustrated in  FIG. 23  includes moving the vane assembly  400  between the first position P 1  and a fourth position P 4  when it is determined that washing water reflected by the vane assembly  400  strikes the door  11 . 
         [0336]    The vane movement method  1700  will be described with reference to  FIGS. 22 and 23 . 
         [0337]    First, the dishwasher  1  positions the vane assembly  400  at the second position P 2  ( 1710 ). For example, when the vane assembly  400  is positioned at the first position P 1 , the dishwasher  1  may position the vane assembly  400  at the second position P 2  by operating the vane driving motor  520  (see  FIG. 4 ) for the first reference time or more in the second rotation direction. 
         [0338]    Then, the dishwasher  1  detects a first vibration of the door  11  ( 1720 ). Specifically, the dishwasher  1  may detect the first vibration through a vibration sensor attached to the door  11 . 
         [0339]    Then, the dishwasher  1  determines whether the first vibration exceeds a predetermined reference value ( 1730 ). Here, the reference value may be set to a value of a vibration value generated when dishes are accommodated near the door  11  of the dishwasher  1  added to a tolerance. In addition, the tolerance refers to a deviation of vibrations generated when washing water that strikes the dishes strikes the door again. 
         [0340]    When the first vibration is greater than the reference value (YES in  1730 ), the dishwasher  1  moves the vane assembly  400  forward and backward between the first position P 1  and the fourth position P 4  ( 1740 ). 
         [0341]    The first vibration generated when the vane assembly  400  is positioned at the second position P 2  being greater than the reference value refers to washing water reflected by the vane assembly  400  directly striking the door  11  because dishes are not accommodated near the door  11 . 
         [0342]    Accordingly, the dishwasher  1  moves the vane assembly  400  to the fourth position P 4  at which the washing water reflected by the vane assembly  400  does not directly strike the door  11 . 
         [0343]    When the first vibration is not greater than the reference value (NO in  1730 ) the dishwasher  1  moves the vane assembly  400  forward and backward between the first position P 1  and the second position P 2  ( 1750 ). 
         [0344]    A vibration generated when the vane assembly  400  is positioned at the second position P 2  being the reference value or less refers to the washing water reflected by the vane assembly  400  not directly striking the door  11  because dishes are accommodated near the door  11 . 
         [0345]    Accordingly, the dishwasher  1  moves the vane assembly  400  to the second position P 2  corresponding to an end of the vane movement section  11  (see  FIG. 12 ) in a direction of the door  11  to wash the dishes near the door  11 . 
         [0346]    Through such a vane movement method  1700 , the dishwasher  1  may reduce noise by preventing washing water from directly striking the door  11 . 
         [0347]      FIG. 24  is a view illustrating a vane movement method according to yet another embodiment. 
         [0348]    A vane movement method  1800  will be described with reference to  FIGS. 22 and 24 . 
         [0349]    First, the dishwasher  1  positions the vane assembly  400  at the second position P 2  ( 1805 ). For example, when the vane assembly  400  is positioned at the first position P 1 , the dishwasher  1  may position the vane assembly  400  at the second position P 2  by operating the vane driving motor  520  (see  FIG. 4 ) for the first reference time or more in the second rotation direction. 
         [0350]    Then, the dishwasher  1  detects a first vibration of the door  11  ( 1810 ). Specifically, the dishwasher  1  may detect the first vibration through a vibration sensor attached to the door  11 . 
         [0351]    Then, the dishwasher  1  positions the vane assembly  400  at the fourth position P 4  ( 1815 ). For example, when the vane assembly  400  is positioned at the second position P 2 , the dishwasher  1  may position the vane assembly  400  at the fourth position P 4  by operating the vane driving motor  520  (see  FIG. 4 ) in the first rotation direction. 
         [0352]    Then, the dishwasher  1  detects a second vibration of the door  11  ( 1820 ). Specifically, the dishwasher  1  may detect the second vibration through a vibration sensor attached to the door  11 . 
         [0353]    Then, the dishwasher  1  determines whether a difference between the first vibration and the second vibration is greater than a tolerance ( 1830 ). Here, the tolerance refers to a deviation of vibrations that may be generated when washing water that strikes dishes strikes the door  11  again. 
         [0354]    When the difference between the first vibration and the second vibration is greater than the tolerance (YES in  1830 ), the dishwasher  1  moves the vane assembly  400  forward and backward between the first position P 1  and the fourth position P 4  ( 1840 ). 
         [0355]    The difference between the first vibration and the second vibration being greater than the tolerance refers to washing water reflected by the vane assembly  400  directly striking the door  11  because dishes are not accommodated near the door  11 . Accordingly, the dishwasher  1  moves the vane assembly  400  to the fourth position P 4  at which the washing water reflected by the vane assembly  400  does not directly strike the door  11 . 
         [0356]    When the difference between the first vibration and the second vibration is not greater than the tolerance (NO in  1830 ), the dishwasher  1  moves the vane assembly  400  forward and backward between the first position P 1  and the second position P 2  ( 1850 ). 
         [0357]    The difference between the first vibration and the second vibration being within the tolerance refers to washing water reflected by the vane assembly  400  not directly striking the door  11  because dishes are accommodated near the door  11 . 
         [0358]    Accordingly, the dishwasher  1  moves the vane assembly  400  to the second position P 2  corresponding to an end of the vane movement section  11  (see  FIG. 12 ) in the direction of the door  11  to wash the dishes near the door  11 . 
         [0359]    Through such a vane movement method  1800 , the dishwasher  1  may reduce noise by preventing washing water from directly striking the door  11 . 
         [0360]      FIG. 25  is a view illustrating a trajectory of washing water when a distribution mode of the dishwasher is changed according to one embodiment. 
         [0361]    As described above, the dishwasher  1  may be operated in a plurality of washing water distribution modes. For example, the dishwasher may be operated in a first distribution mode for supplying washing water only to the rotary spray nozzles  61  and  63  (see  FIG. 3 ), a second distribution mode for supplying washing water only to the right fixed nozzle  340 , a third distribution mode for supplying washing water to the left and right fixed nozzles  330  and  340 , or a fourth distribution mode for supplying washing water only to the left fixed nozzle  330 . 
         [0362]    When a distribution mode of the dishwasher  1  is changed, the distribution valve assembly  200  (see  FIG. 3 ) that distributes washing water closes and reopens a flow path for supplying the washing water to the fixed nozzle assembly  300 . 
         [0363]    For example, when changing from the second distribution mode to the third distribution mode, a flow path for supplying washing water to the right fixed nozzle  340  in the second and third distribution modes is closed and reopened. Accordingly, a pressure of the washing water sprayed from the right fixed nozzle  340  decreases, and a spray distance of the washing water decreases accordingly as illustrated in  FIG. 25 . In addition, a flow path for supplying the washing water to the left fixed nozzle  330  is opened in the third distribution mode, a pressure of the washing water sprayed from the left fixed nozzle  330  decreases right after the flow path is opened, and the spray distance of the washing water decreases accordingly as illustrated in  FIG. 25 . 
         [0364]    When the spray distance of the washing water decreases and the vane assembly  400  is positioned farther away than a decreased distance from the first position P 1 , the washing water directly strikes the bottom plate  35  of the tub  30  and generates vibrations and noise. 
         [0365]    In other words, when a distribution mode is changed and the vane assembly  400  is positioned beyond a position at which washing water reaches from the fixed nozzle assembly  300  (here, referred to as a fifth position), the washing water directly strikes the bottom plate  35  of the tub  30 . 
         [0366]      FIG. 26  is a view illustrating a vane movement method according to yet another embodiment. 
         [0367]    A vane movement method  1900  illustrated in  FIG. 26  includes controlling a movement of the vane assembly  400  according to remaining distribution time to a distribution mode change of the dishwasher  1  (hereinafter, referred to as the remaining distribution time). 
         [0368]    The vane movement method  1900  will be described with reference to  FIGS. 25 and 26 . 
         [0369]    First, the dishwasher  1  determines whether the vane assembly  400  is positioned at the first position P 1  ( 1910 ). 
         [0370]    For example, the dishwasher  1  may determine whether the vane assembly  400  is positioned at the first position P 1  according to whether the vane driving motor  520  (see  FIG. 4 ) is operated in the first rotation direction for the first reference time or more. 
         [0371]    In addition, the dishwasher  1  may determine whether the vane assembly  400  is positioned at the first position P 1  according to whether a product of a rotational displacement by which the vane driving motor  520  (see  FIG. 4 ) rotates in the first rotation direction and the radius of the drive pulley  530  (see  FIG. 4 ) is the first reference distance or more. 
         [0372]    In addition, the dishwasher  1  may determine whether the vane assembly  400  is positioned at the first position P 1  according to whether a position detection sensor positioned at the first position P 1  detects a position identification member attached to the vane assembly  400 . 
         [0373]    When it is determined that the vane assembly  400  is positioned at the first position P 1  (YES in  1910 ), the dishwasher  1  determines whether a remaining distribution time is less than a seventh time duration ( 1920 ). Here, the seventh time duration refers to a time for which the vane assembly  400  moves from the first position P 1  to a fifth position P 5 . 
         [0374]    When the remaining distribution time is less than the seventh time duration (YES in  1920 ), the dishwasher  1  moves the vane assembly  400  normally ( 1925 ). When the remaining distribution time is less than the seventh time duration, since the vane assembly  400  is positioned within a spray distance of washing water of the fixed nozzle assembly  400  even when a distribution mode is changed after the remaining distribution time is elapsed, the dishwasher  1  operates the vane assembly  400  normally. 
         [0375]    When the remaining distribution is the seventh time duration or more (NO in  1920 ), the dishwasher  1  determines whether the remaining distribution time is less than a time that is the sum of twice an eighth time duration and the seventh time duration ( 1930 ). Here, the eighth time duration refers to a time for which the vane assembly  400  moves from the fifth position P 5  to the second position P 2 . That is, the sum of the seventh time duration and the eighth time duration is equal to the first reference time. 
         [0376]    In addition, when the vane assembly  400  moves from the first position P 1  for a time that is the sum of twice the eight time duration and the seventh time duration, the vane assembly  400  is positioned at the fifth position P 5 . 
         [0377]    When the remaining distribution time is less than a time that is the sum of twice the sight time duration and the seventh time duration (YES in  1930 ), the dishwasher  1  moves the vane assembly  400  for the seventh time duration in the second direction, and moves the vane assembly  400  for the left-over remaining distribution time in the first direction ( 1935 ). 
         [0378]    When the remaining distribution time is the seventh time duration or more and is less than a time that is the sum of twice the eighth time duration and the seventh time duration and the vane assembly  400  moves forward and backward for the remaining distribution time, the vane assembly  400  is positioned beyond a spray distance of washing water of the fixed nozzle assembly  300  when a distribution mode is changed. 
         [0379]    Accordingly, the dishwasher  1  moves the vane assembly  400  only for the seventh time duration in the second direction D 2 , and moves the vane assembly  400  for the remaining distribution time duration in the first direction D 1 . 
         [0380]    Although not illustrated in  FIG. 26 , the vane assembly  400  may also be positioned at the first position P 1  for the remaining distribution time. That is, by positioning the vane assembly  400  at the first position P 1  for the remaining distribution time, the vane assembly  400  is prevented from being positioned beyond a spray distance of washing water of the fixed nozzle assembly  300  when a distribution mode is changed. 
         [0381]    When the remaining distribution time is equal to or greater than a time that is the sum of twice the eighth time duration and the seventh time duration (NO in  1930 ), the dishwasher  1  determines whether the remaining distribution time is less than a time that is the sum of twice the eighth time duration and twice the seventh time duration ( 1940 ). 
         [0382]    When the vane assembly  400  moves for a time that is the sum of twice the eighth time duration and twice the seventh time duration from the first position P 1 , the vane assembly  400  is positioned at the first position P 1  again. 
         [0383]    When the remaining distribution time is less than a time that is the sum of twice the eighth time duration and twice the seventh time duration (YES in  1940 ), the dishwasher  1  moves the vane assembly  400  normally ( 1925 ). When the remaining distribution time is less than a time that is the sum of twice the eighth time duration and twice the seventh time duration, the dishwasher  1  operates the vane assembly  400  normally since the vane assembly  400  is positioned within a spray distance of washing water of the fixed nozzle assembly  300  after the remaining distribution time is elapsed. 
         [0384]    When the remaining distribution time is equal to or greater than a time that is the sum of twice the eighth time duration and twice the seventh time duration (NO in  1940 ), the dishwasher  1  moves the vane assembly  400  in the first direction D 1  ( 1950 ). That is, since the remaining distribution time is greater than a time for which the vane assembly  400  moves forward and backward, the dishwasher  1  defers determination and operates the vane assembly  400  normally. 
         [0385]    Through such a vane movement method  1900 , the dishwasher  1  may reduce noise by preventing washing water from directly striking the bottom plate  35  when a distribution mode is changed. 
         [0386]    However, the method is not limited thereto, to prevent washing water from directly striking the bottom plate  35  when a distribution mode is changed, a movement of the vane assembly may be stopped for the remaining distribution time when the vane assembly  400  is positioned at the first position P 1  and the remaining distribution time is less than twice the first reference time (a time for which the vane assembly  400  moves between the first position P 1  and the second position P 2 ). That is, the vane assembly  400  may be positioned at the first position P 1  for the remaining distribution time. 
         [0387]    While the embodiments of the present disclosure have been illustrated and described above description, the disclosure is not limited to the above-described specific embodiments, and variously modified embodiments may be made by those skilled in the art without departing from the gist of the disclosure claimed by the appended claims and the modified embodiments may not be separately understood from the disclosure.