Patent Publication Number: US-10782066-B2

Title: Refrigeration control method for refrigerator and refrigerator

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is a national phase entry of International Application No. PCT/CN2016/113935, filed Dec. 30, 2016, which claims priority to Chinese Patent Application No. 201610470713.3, filed Jun. 23, 2016, which are incorporated herein by reference in their entirety. 
     TECHNICAL FIELD 
     The present invention relates to the field of household appliances control, and in particular to a refrigeration control method for a refrigerator and a refrigerator. 
     BACKGROUND OF THE INVENTION 
     With the development of society and the improvement of people&#39;s living standards as well as the increasingly rapid pace of life, people are getting used to buying a lot of food and putting same in a refrigerator, so the demand for refrigerators is also higher and higher. 
     A conventional refrigerator is generally provided with a refrigerating compartment and a freezing compartment, and the same refrigeration cycle system provides refrigeration capacity to the two compartments via a refrigerating circuit and a freezing circuit. Such a refrigeration cycle system controls the flow direction of the refrigerant by providing a solenoid valve so as to separately perform refrigeration using evaporators correspondingly provided for the refrigerating compartment and the freezing compartment. However, such a refrigeration cycle system can only provide refrigeration capacity to one of the compartments at a time, and cannot handle the situation where the two compartments require the system to provide refrigeration capacity at the same time. In addition, when the refrigeration cycle system switches between the refrigerating circuit and the freezing circuit, especially switching from the freezing circuit to the refrigerating circuit, the refrigerant migration causes a large loss of refrigeration capacity, thus increasing the energy consumption of the refrigerator and reducing the user experience. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a refrigeration control method suitable for use in a parallel dual-cycle system refrigerator. 
     A further object of the present invention is to appropriately make a selection from evaporators connected in parallel to meet refrigeration requirements of the refrigerator. 
     Another further object of the present invention is to reduce the loss of refrigeration capacity during refrigerant migration to reduce the energy consumption of the refrigerator. 
     In particular, the present invention provides a refrigeration control method for a refrigerator, with the refrigerator being provided with a first compartment where a first evaporator performs refrigeration and a second compartment where a second evaporator performs refrigeration, the first evaporator and the second evaporator being arranged in parallel and configured to alternatively perform refrigeration, and the refrigeration control method for a refrigerator comprising: acquiring the refrigeration state of the first evaporator and the refrigeration state of the second evaporator; when the first evaporator performs refrigeration, acquiring the temperature of the second compartment; when the temperature of the second compartment is greater than the starting temperature of the second compartment and the difference between the temperature of the second compartment and the starting temperature of the second compartment is less than a first preset threshold, acquiring the temperature of the first compartment and determining whether the temperature of the first compartment is less than a preset first reference temperature, the first reference temperature being calculated according to the starting temperature of the first compartment and a set adjustment temperature; and when the temperature of the first compartment is less than the first reference temperature, switching the refrigerator into a state where the second evaporator performs refrigeration. 
     Optionally, when the difference between the temperature of the second compartment and the starting temperature of the second compartment is greater than or equal to the first preset threshold, the refrigerator is switched into a state where the second evaporator performs refrigeration. 
     Optionally, prior to the step of acquiring the temperature of the first compartment, the method further comprises: determining whether the refrigeration time of the first evaporator is less than a preset refrigeration time threshold; and if yes, performing the step of acquiring the temperature of the first compartment, and if not, switching the refrigerator into a state where the second evaporator performs refrigeration. 
     Optionally, when the temperature of the first compartment is greater than or equal to the first reference temperature, the state where the first evaporator performs refrigeration is maintained. 
     Optionally, when the starting temperature of the first compartment is less than the starting temperature of the second compartment and the first evaporator performs refrigeration, the method further comprises: determining whether the temperature of the first compartment is less than the shutdown temperature of the first compartment and whether the temperature of the second compartment is greater than the starting temperature of the second compartment; and when the temperature of the first compartment is less than the shutdown temperature of the first compartment and the temperature of the second compartment is greater than the starting temperature of the second compartment, switching the refrigerator into a state where the second evaporator performs refrigeration. 
     Optionally, when the starting temperature of the first compartment is greater than the starting temperature of the second compartment and the first evaporator performs refrigeration, the method further comprises: determining whether the temperature of the first compartment is less than the shutdown temperature of the first compartment; and if yes, determining whether the temperature of the second compartment is greater than a second reference temperature, and if yes, switching the refrigerator into a state where the second evaporator performs refrigeration, the second reference temperature being calculated according to the starting temperature and the shutdown temperature of the second compartment. 
     Optionally, when the starting temperature of the first compartment is less than the starting temperature of the second compartment and both the first evaporator and the second evaporator stop refrigeration, the method further comprises: acquiring the temperature of the first compartment and the temperature of the second compartment; and when the temperature of the first compartment is greater than or equal to the starting temperature of the first compartment and the temperature of the second compartment is greater than or equal to the starting temperature of the second compartment, switching the refrigerator into a state where the second evaporator performs refrigeration. 
     Optionally, the first reference temperature is calculated according to the sum of the starting temperature of the first compartment and a set adjustment temperature, and the adjustment temperature is calculated by multiplying the difference between the starting temperature and the shutdown temperature of the first compartment by a preset adjustment coefficient. 
     According to another aspect of the present invention, a refrigerator is further provided. The refrigerator comprises: a refrigerator body with a first compartment and a second compartment defined therein; a first evaporator configured to perform refrigeration for the first compartment; a second evaporator arranged in parallel with the first evaporator and configured to perform refrigeration for the second compartment, the first evaporator and the second evaporator being configured to alternatively perform refrigeration; and a cooling medium switching device configured to acquire the refrigeration state of the first evaporator and the refrigeration state of the second evaporator; when the first evaporator performs refrigeration, acquiring the temperature of the second compartment; when the temperature of the second compartment is greater than the starting temperature of the second compartment and the difference between the temperature of the second compartment and the starting temperature of the second compartment is less than a first preset threshold, acquiring the temperature of the first compartment and determining whether the temperature of the first compartment is less than a preset first reference temperature, the first reference temperature being calculated according to the starting temperature of the first compartment and a set adjustment temperature; and when the temperature of the first compartment is less than the first reference temperature, switching the refrigerator into a state where the second evaporator performs refrigeration. 
     Optionally, the cooling medium switching device is further configured for: when the difference between the temperature of the second compartment and the starting temperature of the second compartment is greater than or equal to a first preset threshold, switching the refrigerator into a state where the second evaporator performs refrigeration; prior to acquiring the temperature of the first compartment, determining whether the refrigeration time of the first evaporator is less than a preset refrigeration time threshold; and if yes, acquiring the temperature of the first compartment and comparing the temperature with the first reference temperature, and if not, switching the refrigerator into a state where the second evaporator performs refrigeration; and when the temperature of the first compartment is greater than or equal to the first reference temperature, maintaining the state where the first evaporator performs refrigeration. 
     Optionally, when the starting temperature of the first compartment is less than the starting temperature of the second compartment and the first evaporator performs refrigeration, the cooling medium switching device is further configured for: determining whether the temperature of the first compartment is less than the shutdown temperature of the first compartment and whether the temperature of the second compartment is greater than the starting temperature of the second compartment; and when the temperature of the first compartment is less than the shutdown temperature of the first compartment and the temperature of the second compartment is greater than the starting temperature of the second compartment, switching the refrigerator into a state where the second evaporator performs refrigeration. 
     Optionally, when the starting temperature of the first compartment is greater than the starting temperature of the second compartment and the first evaporator performs refrigeration, the cooling medium switching device is further configured for: determining whether the temperature of the first compartment is less than the shutdown temperature of the first compartment; and if yes, determining whether the temperature of the second compartment is greater than a second reference temperature, and if yes, switching the refrigerator into a state where the second evaporator performs refrigeration, the second reference temperature being calculated according to the starting temperature and the shutdown temperature of the second compartment. 
     Optionally, when the starting temperature of the first compartment is less than starting temperature of the second compartment and both the first evaporator and the second evaporator stop refrigeration, the cooling medium switching device is further configured for acquiring the temperature of the first compartment and the temperature of the second compartment; and when the temperature of the first compartment is greater than or equal to the starting temperature of the first compartment and the temperature of the second compartment is greater than or equal to the starting temperature of the second compartment, switching the refrigerator into a state where the second evaporator performs refrigeration. 
     According to the refrigeration control method for a refrigerator and the refrigerator of the present invention, with the refrigerator being provided with a first compartment where a first evaporator performs refrigeration and a second compartment where a second evaporator performs refrigeration, and the first evaporator and the second evaporator being arranged in parallel and configured to alternatively perform refrigeration, and by means of acquiring the refrigeration state of the first evaporator and the refrigeration state of the second evaporator; when the first evaporator performs refrigeration, acquiring the temperature of the second compartment; when the temperature of the second compartment is greater than the starting temperature of the second compartment and the difference between the temperature of the second compartment and the starting temperature of the second compartment is less than a first preset threshold, acquiring the temperature of the first compartment and determining whether the temperature of the first compartment is less than a preset first reference temperature, the first reference temperature being calculated according to the starting temperature of the first compartment and a set adjustment temperature; and when the temperature of the first compartment is less than the first reference temperature, switching the refrigerator into a state where the second evaporator performs refrigeration. The set adjustment temperature can be used to determine the degree of urgency to which the two compartments require refrigeration, and a selection can be appropriately made from the evaporators connected in parallel when the two compartments require refrigeration at the same time so as to meet the refrigeration requirements of the refrigerator, so that the refrigeration control method for a refrigerator is more appropriate, and the adjustment temperature is set according to the actual requirements of the user, thereby effectively improving the user experience and meeting the differential requirements of the user. 
     Further, according to the refrigeration control method for a refrigerator and the refrigerator of the present invention, the refrigeration control method for a refrigerator comprises: when the starting temperature of the first compartment is less than the starting temperature of the second compartment and both the first evaporator and the second evaporator stop refrigeration, acquiring the temperature of the first compartment and the temperature of the second compartment; and when the temperature of the first compartment is greater than or equal to the starting temperature of the first compartment and the temperature of the second compartment is greater than or equal to the starting temperature of the second compartment, switching the refrigerator into a state where the second evaporator performs refrigeration, thereby reducing switching from a state where the compartment having a low starting temperature performs refrigeration to a state where the compartment having a high starting temperature performs refrigeration, so as to effectively avoid the loss of refrigeration capacity during refrigerant migration to avoid the increased energy consumption of the refrigerator. 
     According to the detailed description of specific embodiments of the present invention below in conjunction with the accompanying drawings, the above and other objects, advantages and features will become more apparent for a person skilled in the art. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Some of specific embodiments of the present invention will be described below in detail with reference to the accompanying drawings by way of example but not by way of limitation. The same reference signs indicate the same or similar components or parts in the accompanying drawings. It is understood by a person skilled in the art that the accompanying drawings are not necessarily drawn to scale. In the accompanying drawings: 
         FIG. 1  is a schematic block diagram of a refrigerator according to an embodiment of the present invention; 
         FIG. 2  is a schematic diagram of a parallel refrigeration system in a refrigerator according to an embodiment of the present invention; 
         FIG. 3  is a schematic diagram of a refrigeration control method for a refrigerator according to an embodiment of the present invention; 
         FIG. 4  is a schematic diagram of a refrigeration control method for a refrigerator according to another embodiment of the present invention; and 
         FIG. 5  is a schematic diagram of a refrigeration control method for a refrigerator according to another embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIG. 1  is a schematic block diagram of a refrigerator  100  according to an embodiment of the present invention. The refrigerator  100  may generally comprise: a refrigerator body  10 , a first evaporator  21 , a second evaporator  22  and a cooling medium switching device  30 . 
     Storage compartments are defined inside the refrigerator body  10  of the refrigerator  100 . The number and structure of the storage compartments may be configured according to requirements, and the storage compartment is configured as a refrigerating compartment, a freezing compartment, a variable-temperature compartment or a freshness-keeping compartment according to different uses. Each compartment may be divided into multiple storage areas by partition plates, and shelves or drawers are used to store articles. A first compartment  11  and a second compartment  12  are defined inside the refrigerator body  10  of the refrigerator  100  of this embodiment. 
     The first evaporator  21  is configured to perform refrigeration for the first compartment  11 . The second evaporator  22  is arranged in parallel with the first evaporator  21  and is configured to perform refrigeration for the second compartment  12 , and the first evaporator  21  and the second evaporator  22  are configured to alternatively perform refrigeration for the first compartment  11  or the second compartment  12 . 
       FIG. 2  is a schematic diagram of a parallel refrigeration system in the refrigerator  100  as shown in  FIG. 1 . The parallel refrigeration system comprises: a first evaporator  21 , a second evaporator  22 , a compressor  23 , a condenser  24 , a drier-filter  25 , a bistable solenoid valve  26 , a first capillary tube  27 , and a second capillary tube  28 . The flow direction of the refrigerant is switched by controlling the bistable solenoid valve  26 , so that one of the first evaporator  21  and the second evaporator  22  performs refrigeration. 
     When the bistable solenoid valve  26  is switched into a state where the first evaporator  21  performs refrigeration, the refrigerant is compressed into a high-temperature and high-pressure gas by the compressor  23  and then enters the condenser  24 . The condenser  24  performs heat exchange from a high-temperature and high-pressure gaseous refrigerant to a low-temperature and high-pressure liquid refrigerant so as to release heat to the outside. Then the liquid refrigerant passes through the drier-filter  25  for filtering out impurities and then passes through the first capillary tube  27  or another throttling device. After passing through the first capillary tube  27 , the pressure of the refrigerant is reduced, the temperature continues to drop, and the refrigerant turns into a gas-liquid two-phase refrigerant and then enters the first evaporator  21 . At this time, the refrigerant is subjected to heat exchange and vaporization in the first evaporator  21  to absorb external heat so as to implement refrigeration, and turns into a high-temperature low-pressure gaseous refrigerant which returns to the compressor to continue the circulation. When the bistable solenoid valve  26  is switched into a state where the second evaporator  22  performs refrigeration, the refrigerant passes through the drier-filter  25  and then passes through the second capillary tube  28  and the second evaporator  22  in sequence. The working process of the refrigeration cycle is similar to the above process. 
     The bistable solenoid valve  26  serves as an execution mechanism for the cooling medium switching device  30  to switch the flow direction of the refrigerant. In addition, the cooling medium switching device  30  may further comprise a temperature sensor and a data processor, wherein the first compartment  11  and the second compartment  12  may be respectively provided with a temperature sensor for detecting the internal temperature of the first compartment  11  and the internal temperature of the second compartment  12 , and the data processor can process the acquired temperature values according to a preset control algorithm, thereby implementing the refrigeration control for the two compartments of the refrigerator. 
     The cooling medium switching device  30  may be configured for acquiring the refrigeration state of the first evaporator  21  and the refrigeration state of the second evaporator  22 ; when the first evaporator  21  performs refrigeration, acquiring the temperature of the second compartment  12 ; when the temperature of the second compartment  12  is greater than the starting temperature of the second compartment  12  and the difference between the temperature of the second compartment  12  and the starting temperature of the second compartment  12  is less than a first preset threshold, acquiring the temperature of the first compartment  11 , and determining whether the temperature of the first compartment  11  is less than a preset first reference temperature, the first reference temperature being calculated according to the starting temperature of the first compartment  11  and a set adjustment temperature; and when the temperature of the first compartment  11  is less than the first reference temperature, switching the refrigerator  100  into a state where the second evaporator  22  performs refrigeration. The first compartment  11  and the second compartment  12  may be respectively provided with a temperature sensor to detect the temperature in the first compartment  11  and the temperature in the second compartment  12 . 
     The first reference temperature may be calculated according to the sum of the starting temperature of the first compartment  11  and a set adjustment temperature, and the adjustment temperature is calculated by multiplying the difference between the starting temperature and the shutdown temperature of the first compartment  11  by a preset adjustment coefficient, or the adjustment temperature may be directly set by a user. As an example, the first compartment  11  may be a freezing compartment, and the starting temperature of the freezing compartment is TFU, the shutdown temperature of the freezing compartment is TFD, the adjustment coefficient is vFre, the adjustment temperature is TFga, and the first reference temperature is TFre 1 , thus TFga=(TFU−TFD)*vFre, and TFre 1 =TFD+TFga. As a further example, the first compartment  11  may be a refrigerating compartment, and the starting temperature of the refrigerating compartment is TRU, the shutdown temperature of the refrigerating compartment is TRD, the adjustment coefficient is vRre, the adjustment temperature is TRga, and the first reference temperature is TRre 1 , thus TRga=(TRU−TRD)*vRre, and TRre 1 =TRD+TRga. 
     The value of the adjustment coefficient vFre or vRre ranges from 0 to 1. Moreover, the user may set the adjustment coefficient according to the actual requirements. If the user has a strict requirement on refrigeration of the first compartment  11 , that is, when the two compartments require refrigeration at the same time, the user prefers the first compartment  11  to perform refrigeration, and the adjustment coefficient may be set small, for example, set to be 0.2. If the user does not have a strict requirement on refrigeration of the first compartment  11 , that is, when the two compartments require refrigeration at the same time, the user prefers the second compartment  12  to perform refrigeration, and the adjustment coefficient may be set large, for example, set to be 0.8. If the user gives consideration to the refrigeration of both the first compartment  11  and the second compartment  12 , the adjustment coefficient may be set to be 0.5. The above specific values are merely examples and are not intended to limit the present invention. 
     The refrigerator  100  may also be provided with a display device, and the user may use the display device to set the adjustment coefficient. For example, an interface of the display device may include an adjustment coefficient setting option, and the user sets the adjustment coefficient by means of touching or key-pressing. 
     The refrigerator  100  of this embodiment can use the set adjustment temperature to determine the degree of urgency to which the two compartments require refrigeration, and appropriately select from the evaporators connected in parallel when the two compartments require refrigeration at the same time so as to meet the refrigeration requirements of the to refrigerator, so that the refrigeration control method for a refrigerator is more appropriate, and the adjustment temperature is set according to the actual requirements of the user, thereby effectively improving the user experience and meeting the differential requirements of the user. 
     The cooling medium switching device  30  may also be configured for: when the difference between the temperature of the second compartment  12  and the starting temperature of the second compartment  12  is greater than or equal to a first preset threshold, switching the refrigerator  100  into a state where the second evaporator  22  performs refrigeration; prior to acquiring the temperature of the first compartment  11 , determining whether the refrigeration time of the first evaporator  21  is less than a preset refrigeration time threshold, and if yes, acquiring the temperature of the first compartment  11  and comparing the temperature with a first reference temperature, and if not, switching the refrigerator  100  into a state where the second evaporator  22  performs refrigeration; and when the temperature of the first compartment  11  is greater than or equal to the first reference temperature, maintaining the state where the first evaporator  21  performs refrigeration. 
     In the refrigerator  100  of the above embodiment, the first compartment  11  may be a refrigerating compartment, and the second compartment  12  may be a freezing compartment; or the first compartment  11  may be a freezing compartment, and the second compartment  12  may be a refrigerating compartment. 
     In one specific embodiment, the first compartment  11  of the refrigerator  100  may be a freezing compartment, the second compartment  12  may be a refrigerating compartment, and at this time the starting temperature of the first compartment  11  is less than the starting temperature of the second compartment  12 . When the first evaporator  21  performs refrigeration, the cooling medium switching device  30  may also be configured for: determining whether the temperature of the first compartment  11  is less than the shutdown temperature of the first compartment  11  and whether the temperature of the second compartment  12  is greater than the starting temperature of the second compartment  12 ; and when the temperature of the first compartment  11  is less than the shutdown temperature of the first compartment  11  and the temperature of the second compartment  12  is greater than the starting temperature of the second compartment  12 , switching the refrigerator  100  into a state where the second evaporator  22  preforms refrigeration. In this embodiment, where both the first evaporator  21  and the second evaporator  22  stop refrigeration, the cooling medium switching device  30  may also be configured for: acquiring the temperature of the first compartment  11  and the temperature of the second compartment  12 ; and when the temperature of the first compartment  11  is greater than or equal to the starting temperature of the first compartment  11  and the temperature of the second compartment  12  is greater than or equal to the starting temperature of the second compartment  12 , switching the refrigerator  100  into a state where the second evaporator  22  performs refrigeration. 
     The refrigerator  100  of this embodiment can reduce switching from a state where the compartment having a low starting temperature (for example, the freezing compartment) performs refrigeration to a state where the compartment having a high starting temperature (for example, the refrigerating compartment) performs refrigeration, so as to effectively avoid the loss of refrigeration capacity during refrigerant migration to avoid the increased energy consumption of the refrigerator. 
     In another specific embodiment, the first compartment  11  of the refrigerator  100  may be a refrigerating compartment, the second compartment  12  may be a freezing compartment, and at this time the starting temperature of the first compartment  11  is obviously greater than the starting temperature of the second compartment  12 . When the first evaporator  21  performs refrigeration, the cooling medium switching device  30  may also be configured for: determining whether the temperature of the first compartment  11  is less than the shutdown temperature of the first compartment  11 ; and if yes, determining whether the temperature of the second compartment  12  is greater than a second reference temperature, and if yes, switching the refrigerator  100  into a state where the second evaporator  22  performs refrigeration, the second reference temperature being calculated according to the starting temperature and the shutdown temperature of the second compartment  12 . 
       FIG. 3  is a schematic diagram of a refrigeration control method for a refrigerator according to an embodiment of the present invention. The refrigeration control method for a refrigerator may be performed by the refrigerator  100  of any of the above embodiments. As shown, the refrigeration control method for a refrigerator comprises the following steps in sequence: 
     step S 302 , acquiring the refrigeration state of the first evaporator  21  and the refrigeration state of the second evaporator  22 ; 
     step S 304 , determining whether the first evaporator  21  is in the refrigeration state, and if yes, performing step S 306 ; 
     step S 306 , acquiring the temperature of the second compartment  12 ; 
     step S 308 , determining whether the temperature of the second compartment  12  is greater than the starting temperature of the second compartment  12  and whether the difference between the temperature of the second compartment  12  and the starting temperature of the second compartment  12  is less than the first preset threshold, and if yes, performing step S 310 ; 
     step S 310 , acquiring the temperature of the first compartment  11 ; 
     step S 312 , determining whether the temperature of the first compartment  11  is less than a preset first reference temperature, and if yes, performing S 314 ; and 
     step S 314 , switching the refrigerator  100  into a state where the second evaporator  22  performs refrigeration. 
     In the refrigeration control method for a refrigerator of this embodiment, the first compartment  11  of the refrigerator  100  may be a refrigerating compartment, and the second compartment  12  may be a freezing compartment; or the first compartment  11  may be a freezing compartment, and the second compartment  12  may be a refrigerating compartment. That is, the refrigeration control method for a refrigerator of this embodiment is suitable for switching from the refrigerating compartment refrigeration to the freezing compartment refrigeration, and is also suitable for switching from the freezing compartment refrigeration to the refrigerating compartment refrigeration. 
     In step S 308 , the first preset threshold may be set according to the actual requirements of the user. If the user has a strict requirement on refrigeration of the first compartment, that is, the user considers that the temperature of the first compartment cannot be too higher than the starting temperature of the first compartment, the first preset threshold may be set small, for example, may be set to be 3° C. If the user does not have a strict requirement on refrigeration of the first compartment, that is, the user considers the temperature of the first compartment can be too higher than the starting temperature of the first compartment, the first preset threshold may be set large, for example, may be set to be 6° C. The above specific values are merely examples and are not intended to limit the present invention. 
     In step S 312 , the preset first reference temperature is calculated according to the starting temperature of the first compartment  11  and the set adjustment temperature, the first reference temperature is calculated according to the sum of the starting temperature of the first compartment  11  and the set adjustment temperature, and the adjustment temperature is calculated by multiplying the difference between the starting temperature and the shutdown temperature of the first compartment  11  by a preset adjustment coefficient, or the adjustment temperature can be directly set by the user. As an example, the first compartment  11  may be a freezing compartment, and the starting temperature of the freezing compartment is TFU, the shutdown temperature of the freezing compartment is TFD, the adjustment coefficient is vFre, the adjustment temperature is TFga, and the first reference temperature is TFre 1 , thus TFga=(TFU−TFD)*vFre, and TFre 1 =TFD+TFga. As a further example, the first compartment  11  may be a refrigerating compartment, and the starting temperature of the refrigerating compartment is TRU, the shutdown temperature of the refrigerating compartment is TRD, the adjustment coefficient is vRre, the adjustment temperature is TRga, and the first reference temperature is TRre 1 , thus TRga=(TRU−TRD)*vRre, and TRre 1 =TRD+TRga. The value of the adjustment coefficient vFre or vRre ranges from 0 to 1. Moreover, the user may set the adjustment coefficient according to the actual requirements. If the user has a strict requirement on refrigeration of the first compartment  11 , that is, when the two compartments require refrigeration at the same time, the user prefers the first compartment  11  to perform refrigeration, and the adjustment coefficient may be set small, for example, set to be 0.2. If the user does not have a strict requirement on refrigeration of the first compartment  11 , that is, when the two compartments require refrigeration at the same time, the user prefers the second compartment  12  to perform refrigeration, and the adjustment coefficient may be set large, for example, set to be 0.8. If the user gives consideration to the refrigeration of both the first compartment  11  and the second compartment  12 , the adjustment coefficient may be set to be 0.5. The above specific values are merely examples and are not intended to limit the present invention. 
     The refrigeration control method for a refrigerator of this embodiment can use the set adjustment temperature to determine the degree of urgency to which the two compartments require refrigeration, and appropriately select from the evaporators connected in parallel when the two compartments require refrigeration at the same time so as to meet the refrigeration requirements of the refrigerator, so that the refrigeration control method for a refrigerator is more appropriate, and the adjustment temperature is set according to the actual requirements of the user, thereby effectively improving the user experience and meeting the differential requirements of the user. 
       FIG. 4  is a schematic diagram of a refrigeration control method for a refrigerator according to another embodiment of the present invention. In the refrigerator  100  performing the refrigeration control method for a refrigerator, the first compartment  11  is a freezing compartment, the second compartment  12  is a refrigerating compartment, and a freezing evaporator of the freezing compartment is in the refrigeration state. As shown, the refrigeration control method for a refrigerator comprises the following steps in sequence: 
     step S 402 , acquiring the temperature TF of the freezing compartment; 
     step S 404 , determining whether the temperature TF of the freezing compartment is less than the shutdown temperature TFD of the freezing compartment, and if yes, performing step S 414 , and if not, performing step S 406 ; 
     step S 406 , acquiring the temperature TR of the refrigerating compartment; 
     step S 408 , determining whether the temperature TR of the refrigerating compartment is greater than the starting temperature TRU of the refrigerating compartment, and if yes, performing step S 410 , and if not, performing step S 428 ; 
     step S 410 , determining whether the difference between the temperature TR of the refrigerating compartment and the starting temperature TRU of the refrigerating compartment is greater than or equal to a first preset threshold, and if yes, performing step S 412 , and if not, performing step S 422 ; 
     step S 412 , switching the refrigerator  100  into a state where a refrigerating evaporator performs refrigeration, 
     wherein from step S 402  to step S 412  of the refrigeration control method for a refrigerator of this embodiment, when the temperature of the freezing compartment does not reach the shutdown temperature while the refrigerating compartment has an urgent requirement on refrigeration, the refrigerator  100  is switched into a state where the refrigerating evaporator performs refrigeration; 
     step S 414 , if the result of determination in step S 404  is yes, stopping refrigeration of the freezing evaporator; 
     step S 416 , acquiring the temperature TR of the refrigerating compartment; 
     step S 418 , determining whether the temperature TR of the refrigerating compartment is greater than the starting temperature TRU of the refrigerating compartment, and if yes, performing step S 412 , and if not, performing step S 420 ; 
     step S 420 , stopping refrigeration of both the freezing evaporator and the refrigerating evaporator, 
     wherein from step S 414  to step S 420  of the refrigeration control method for a refrigerator of this embodiment, when the temperature of the freezing compartment reaches the shutdown temperature while the refrigerating compartment does not require refrigeration, both the freezing evaporator and the refrigerating evaporator stop refrigeration; 
     step S 422 , if the result of determination in step S 410  is no, acquiring the refrigeration time tF of the freezing evaporator; 
     step S 424 , determining whether the refrigeration time tF of the freezing evaporator is less than the preset refrigeration time threshold tFmax, and if yes, performing step S 426 , and if not, performing step S 412 ; 
     step S 426 , determining whether the temperature TF of the freezing compartment is less than the first reference temperature TFre 1 , and if yes, performing step S 412 , and if not, performing step S 428 ; and 
     step S 428 , maintaining the freezing evaporator in the refrigeration state. 
     From step S 422  to step S 428  of the refrigeration control method for a refrigerator of this embodiment, when the temperature of the freezing compartment does not reach the shutdown temperature while the refrigerating compartment does not have an urgent requirement on refrigeration, the freezing evaporator is maintained in the refrigeration state. 
     In the above steps, both the first preset threshold in step S 410  and the preset refrigeration time threshold tFmax in step S 424  may be preset according to the actual requirements, for example, the first preset threshold may be set to be 3° C., and the refrigeration time threshold tFmax may be set to be 30 minutes. The above specific values are merely examples and are not intended to limit the present invention. 
     After both the freezing evaporator and the refrigerating evaporator stop refrigeration in step S 420 , the method may further comprise: acquiring the temperature of the freezing compartment and the temperature of the refrigerating compartment; when the temperature of the freezing compartment is greater than or equal to the starting temperature of the freezing compartment and the temperature of the refrigerating compartment is greater than or equal to the starting temperature of the refrigerating compartment, switching the refrigerator  100  into a state where the refrigerating evaporator performs refrigeration. That is to say, when both the refrigerating compartment and the freezing compartment require refrigeration, it is preferred that the refrigerating compartment performs refrigeration, so that the situation of switching from the freezing compartment refrigeration to the refrigerating compartment refrigeration can be reduced, so as to effectively avoid the loss of refrigeration capacity during refrigerant migration to avoid the increased energy consumption of the refrigerator. 
     In step S 426 , the first reference temperature may be calculated according to the sum of the starting temperature of the freezing compartment and a set adjustment temperature, and the adjustment temperature is calculated by multiplying the difference between the starting temperature and the shutdown temperature of the freezing compartment by a preset adjustment coefficient, or the adjustment temperature may be directly set by the user. As an example, the starting temperature of the freezing compartment is TFU, the shutdown temperature of the freezing compartment is TFD, the adjustment coefficient is vFre, the adjustment temperature is TFga, and the first reference temperature is TFre 1 , thus TFga=(TFU−TFD)*vFre, and TFre 1 =TFD+TFga. The value of the adjustment coefficient vFre ranges from 0 to 1. Moreover, the user may set the adjustment coefficient according to the actual requirements. If the user has a strict requirement on refrigeration of the freezing compartment, that is, when both the refrigerating compartment and the freezing compartment require refrigeration at the same time, the user prefers the freezing compartment to perform refrigeration, and the adjustment coefficient may be set small, for example, set to be 0.2. If the user does not have a strict requirement on refrigeration of the freezing compartment, that is, when both the refrigerating compartment and the freezing compartment require refrigeration at the same time, the user prefers the refrigerating compartment to perform refrigeration, and the adjustment coefficient may be set large, for example, set to be 0.8. If the user gives consideration to the refrigeration of both the refrigerating compartment and the freezing compartment, the adjustment coefficient may be set to be 0.5. The above specific values are merely examples and are not intended to limit the present invention. 
     The refrigeration control method for a refrigerator of this embodiment is suitable for the situation where the first compartment  11  of the refrigerator  100  is a freezing compartment, the second compartment  12  is a refrigerating compartment, and the freezing evaporator of the freezing compartment is in the refrigeration state, can use the set adjustment temperature to determine the degree of urgency to which the two compartments require refrigeration, and appropriately select from the evaporators connected in parallel when the two compartments require refrigeration at the same time so as to meet the refrigeration requirements of the refrigerator, so that the refrigeration control method for a refrigerator is more appropriate, and the adjustment temperature is set according to the actual requirements of the user, thereby effectively improving the user experience and meeting the differential requirements of the user. 
     Further, the refrigeration control method for a refrigerator of this embodiment comprises: when both the freezing evaporator and the refrigerating evaporator stop refrigeration, acquiring the temperature of the freezing compartment and the temperature of the refrigerating compartment; when the temperature of the freezing compartment is greater than or equal to the starting temperature of the freezing compartment and the temperature of the refrigerating compartment is greater than or equal to the starting temperature of the refrigerating compartment, switching the refrigerator  100  into a state where the refrigerating evaporator performs refrigeration; and when both the refrigerating compartment and the freezing compartment require refrigeration at the same time, preferring the refrigeration of the refrigerating compartment, so as to reduce the situation of switching from the freezing compartment refrigeration to the refrigerating compartment refrigeration, thereby effectively avoiding the loss of refrigeration capacity during refrigerant migration to avoid the increased energy consumption of the refrigerator. 
       FIG. 5  is a schematic diagram of the refrigeration control method for a refrigerator according to another embodiment of the present invention. In the refrigerator  100  performing the refrigeration control method for a refrigerator, the first compartment  11  is a refrigerating compartment, the second compartment  12  is a freezing compartment, and the refrigerating evaporator of the refrigerating compartment is in the refrigeration state. As shown, the refrigeration control method for a refrigerator comprises the following steps in sequence: step S 502 , acquiring the temperature TR of the refrigerating compartment; 
     step S 504 , determining whether the temperature TR of the refrigerating compartment is less than the shutdown temperature TRD of the refrigerating compartment, and if yes, preforming step S 514 , and if not, performing step S 506 ; 
     step S 506 , acquiring the temperature TF of the freezing compartment; 
     step S 508 , determining whether the temperature TF of the freezing compartment is greater than the starting temperature TFU of the freezing compartment, and if yes, performing step S 510 , and if not, performing step S 528 ; 
     step S 510 , determining whether the difference between the temperature TF of the freezing compartment and the starting temperature TFU of the freezing compartment is greater than or equal to a first preset threshold, and if yes, performing step S 512 , and if not, performing step S 522 ; 
     step S 512 , switching the refrigerator  100  into a state where the freezing evaporator performs refrigeration, 
     wherein from step S 502  to step S 512  of the refrigeration control method for a refrigerator of this embodiment, when the temperature of the refrigerating compartment does not reach the shutdown temperature while the freezing compartment has an urgent requirement on refrigeration, the refrigerator  100  is switched into a state where the freezing evaporator performs refrigeration; 
     step S 514 , if the result of determination in step S 504  is yes, stopping refrigeration of the refrigerating evaporator; 
     step S 516 , acquiring the temperature TF of the freezing compartment; 
     step S 518 , determining whether the temperature TF of the freezing compartment is greater than a second reference temperature TFre 2 , and if yes, performing step S 512 , and if not, performing step S 520 ; 
     step S 520 , stopping refrigeration of both the freezing evaporator and the refrigerating evaporator, 
     wherein from step S 514  to step S 520  of the refrigeration control method for a refrigerator of this embodiment, when the temperature of the refrigerating compartment reaches the shutdown temperature while the freezing compartment does not require refrigeration, both the freezing evaporator and the refrigerating evaporator stop refrigeration; 
     step S 522 , if the result of determination in step S 510  is no, acquiring the refrigeration time tR of the refrigerating evaporator; 
     step S 524 , determining whether the refrigeration time tR of the refrigerating evaporator is less than a preset refrigeration time threshold tRmax, and if yes, performing step S 526 , and if not, performing step S 512 ; 
     step S 526 , determining whether the temperature TR of the refrigerating compartment is less than a first reference temperature TRre 1 , and if yes, performing step S 512 , and if not, performing step S 528 ; and 
     step S 528 , maintaining the refrigerating evaporator in the refrigeration state. 
     From step S 522  to step S 528  of the refrigeration control method for a refrigerator of this embodiment, when the temperature of the refrigerating compartment does not reach the shutdown temperature while the freezing compartment does not have an urgent requirement on refrigeration, the refrigerating evaporator is maintained in the refrigeration state. 
     In the above steps, both the first preset threshold in step S 510  and the preset refrigeration time threshold tRmax in step S 524  may be preset according to the actual requirements, for example, the first preset threshold may be set to be 3° C., and the refrigeration time threshold tRmax may be set to be 20 minutes. The above specific values are merely examples and are not intended to limit the present invention. 
     The first preset threshold in step S 510  may be set according to the actual requirements of the user. The first reference temperature in step S 526  may be calculated according to the sum of the starting temperature of the refrigerating compartment and the set adjustment temperature, and the adjustment temperature may be calculated by multiplying the difference between the starting temperature and the shutdown temperature of the refrigerating compartment by a preset adjustment coefficient. As an example, the starting temperature of the refrigerating compartment is TRU, the shutdown temperature of the refrigerating compartment is TRD, the adjustment coefficient is vRre, the adjustment temperature is TRga, and the first reference temperature is TRre 1 , thus TRga=(TRU−TRD)*vRre, and TRre 1 =TRD+TRga. The value of the adjustment coefficient vRre ranges from 0 to 1. Moreover, the user may set the adjustment coefficient according to the actual requirements. If the user has a strict requirement on refrigeration of the refrigerating compartment, that is, when both the refrigerating compartment and the freezing compartment require refrigeration at the same time, the user prefers the refrigerating compartment to perform refrigeration, and the adjustment coefficient may be set small, for example, set to be 0.2. If the user does not have a strict requirement on refrigeration of the refrigerating compartment, that is, when both the refrigerating compartment and the freezing compartment require refrigeration at the same time, the user prefers the freezing compartment to perform refrigeration, and the adjustment coefficient may be set large, for example, set to be 0.8. If the user gives consideration to the refrigeration of both the refrigerating compartment and the freezing compartment, the adjustment coefficient may be set to be 0.5. The above specific values are merely examples and are not intended to limit the present invention. 
     The second reference temperature in step S 518  is calculated according to the starting temperature and the shutdown temperature of the freezing compartment. For example, the starting temperature of the freezing compartment is TFU, the shutdown temperature of the freezing compartment is TFD, and the second reference temperature is TFre 2 , thus TFre 2 =(TFU−TFD)*0.5, wherein 0.5 is a preset coefficient, which can be preset according to the actual requirements, and the value of the preset coefficient ranges from 0 to 1. 
     The refrigeration control method for a refrigerator of this embodiment is suitable for the situation where the first compartment  11  of the refrigerator  100  is a refrigerating compartment, the second compartment  12  is a freezing compartment, and the refrigerating evaporator of the refrigerating compartment is in the refrigeration state, can use the set adjustment temperature to determine the degree of urgency to which the two compartments require refrigeration, and appropriately select from the evaporators connected in parallel when the two compartments require refrigeration at the same time so as to meet the refrigeration requirements of the refrigerator, so that the refrigeration control method for a refrigerator is more appropriate, and the adjustment temperature is set according to the actual requirements of the user, thereby effectively improving the user experience and meeting the differential requirements of the user. 
     Further, the refrigeration control method for a refrigerator of this embodiment comprises: after the refrigerating evaporator stops refrigeration, determining whether the temperature of the freezing compartment is greater than the second reference temperature, and if the result is yes, switching the refrigerator  100  into a state where the freezing evaporator performs refrigeration, wherein the second reference temperature is calculated according to the starting temperature and the shutdown temperature of the freezing compartment, and the second reference temperature is less than the starting temperature of the freezing compartment, so that the freezing compartment can perform refrigeration in advance to implement supplement of refrigeration capacity, and the situation of switching from the freezing compartment refrigeration to the refrigerating compartment refrigeration can be reduced, so as to effectively avoid the loss of refrigeration capacity during refrigerant migration to avoid the increased energy consumption of the refrigerator. 
     To this end, it is recognized by a person skilled in the art that although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications complying with the principles of the present invention can be directly determined or derived from the contents disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be construed and considered as covering all of such other variations or modifications.