Patent Publication Number: US-11021896-B2

Title: Motor vehicle door lock device

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a motor vehicle door lock device. 
     JP4145774B discloses a motor vehicle door lock device in which a door can be opened with a releasing motor on the basis of an external electric element (switch) on the door outside a vehicle when an ID signal is authenticated through a wireless communication between a transmitter carried by a driver and an authenticating portion in the vehicle, while the door cannot be opened by cancelling the external electric element when the ID signal is not authenticated. 
     JP4617588B discloses a motor vehicle door lock device in which a door can be opened with a releasing motor on the basis of an external electric element (opening switch) on the side of the door outside the vehicle when a control device controls an unlock state electrically, while the door cannot be opened with the external electric element by cancelling the external electric elements when the control device controls a lock state electrically. 
     In the motor vehicle door lock device in JP4145774B, not only a driver but also a passenger can open the door with a single operation of the external electric element when the ID signal is authenticated, but the passenger without a transmitter cannot open the door when the ID signal is not authenticated. So it is not convenient for the passenger. 
     In the motor vehicle door lock device in JP4617588B, when the control device controls the unlock state, a passenger without a transmitter can open the door by operating the external electric element, but in order to open the locked door from an outside of the vehicle, even a driver with the transmitter requires two operations, i.e. an unlocking action for turning the lock state to the unlock state and a door-opening action of the external electric element. Thus, the door cannot be opened swiftly, and it is not convenient for the driver. 
     SUMMARY OF THE INVENTION 
     In view of the disadvantages, it is an object of the invention to provide a motor vehicle door lock device that is more convenient when a driver or a passenger opens a door. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side elevational view of a motor vehicle with a door lock device according to the present invention. 
         FIG. 2  is a perspective view of the door lock device for a front door. 
         FIG. 3  is a partially exploded perspective view of the door lock device. 
         FIG. 4  is an exploded perspective view of the door lock device. 
         FIG. 5  is a back elevational view of the door lock device. 
         FIG. 6  is a side elevational view of a main part when a locking mechanism of a door lock device is in an unlock state. 
         FIG. 7  is a side elevational view of the main part in a lock state. 
         FIG. 8  is a side elevational view of the main part that is electrically released in the unlock state. 
         FIG. 9  is a side elevational view of the main part that is electrically released in the lock state. 
         FIG. 10  is a side elevational view of the main part that is manually released in the unlock state. 
         FIG. 11  is a side elevational view of the main part that is manually released in the lock state. 
         FIG. 12  is an exploded perspective view of the main part of the door lock device for a rear door. 
         FIG. 13  is a side elevational view of the main part when the locking mechanism is in an unlock state and a childproof mechanism is in a childproof unlock state. 
         FIG. 14  is a side elevational view of the main part when the locking mechanism is in the unlock state and the childproof mechanism is in a childproof lock state. 
         FIG. 15  is a block diagram showing a control circuit. 
         FIG. 16  is a table showing a relation between electrically-operating elements of the front door and switches. 
         FIG. 17  is a table showing a relation between the electrically-operating elements of the rear door and the switches. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENT 
     One embodiment of the invention will be described with respect to drawings. 
     In  FIG. 1 , a front door FD of a four-door motor vehicle V comprises a door lock device  1 F for the front door to hold the front door FD closed; an outside handle OH as an external mechanically-operating element outside the vehicle; an external switch SW 1  as an external electrically operating element outside the vehicle; an inside handle IH as an internal mechanically-operating element inside the vehicle; an internal switch SW 2  as an internal electrically operating element inside the vehicle; a key cylinder KC for switching a locking device (later described) of a door lock device  1 F from the outside of the vehicle to a lock state and an unlock state; and a locking knob (not shown) for switching a locking mechanism to a lock state and an unlock state from the inside of the vehicle. 
     A rear door RD comprises a door lock device  1 R for holding the rear door RD closed; an outside handle OH as an external mechanically-operating element outside the vehicle; an external switch SW 3  as an external electrically operating element outside the vehicle, an inside handle IH as an internal mechanically operating element inside the vehicle; an internal switch SW 4  as an internal electrically operating element inside the vehicle; and a locking knob (not shown) for switching a locking mechanism of a door lock device  1 R from the inside of the vehicle to a lock state and an unlock state. The locking knobs of the front door FD and the rear door RD may be left out depending on a design. 
     In an area where a driver can operate at a driver&#39;s seat (such as an interior close to the driver&#39;s seat or an inner side of the front door FD), there are disposed an internal switch SW 2  for all doors except a door at the driver&#39;s seat; a cancelling switch SW 5  for enabling or cancelling SW 4 , and an internal locking switch SW 11  for switching the locking mechanisms for all the doors to a lock state or an unlock state together, at the interior of the vehicle. 
     The external switches SW 1 , SW 3  are disposed at a front surface of, a back surface of or close to each of the outside handles. The internal switches SW 2 , SW 4  are disposed on a front surface of, a back surface of or close to each of the inside handles IH. In this embodiment, each of the switches SW 1  to SW 4  is a static capacity type touch switch that detects that a finger of a user touches, but is not limited thereto. It may be a proximity switch that detects that part of a human body approaches. 
     When a regular user (driver) with a transmitter SW 6  (or an electronic key) used exclusively for the vehicle approaches a predetermined area around the vehicle V and it is authenticated with agreement in checking of ID signal through wireless communications between the transmitter SW 6  and an external receiver R 1  at the outer side of a vehicle body that the regular user approaches the vehicle V, the external switches SW 1 , SW 3  are electrically controlled by ECU (Electronic Control Unit) in the vehicle to enable the user to operate. 
     In the vehicle V, besides the external receiver R 1 , an internal receiver R 2  is disposed inside the vehicle. The external receiver R 1  is able to receive a signal from the transmitter SW 6  existing within the external predetermined area, and the internal receiver R 2  is able to receive a signal from the transmitter SW 6  inside the vehicle. 
     The transmitter SW 6  is positioned in a wireless portable switch SW 10  as an external electrically-operating element carried by the user, or is separate from the portable switch SW 10 . The portable switch SW 10  comprises an opening-switch portion operated when the door is opened; and a lock/unlock switch portion operated when the locking mechanism is switched. The opening-switch portion is assigned for each of the doors, and the lock/unlock switch portion is used for all the doors. When the ID signal from transmitter SW 6  is authenticated, the open-switch portion and the lock/unlock switch portion can be operated, and when it is not authenticated, they cannot be operated. 
       FIG. 2  is a perspective view of the door lock device  1 F;  FIG. 3  is a partially-exploded perspective view of the door lock device  1 F;  FIG. 4  is an exploded perspective view of the door lock device  1 F;  FIG. 5  is a back elevational view of the door lock device  1 F; and  FIGS. 6-11  are operation explaining views. 
     Directions in the following description are determined in the door lock devices  1 F,  1 R attached in the door. 
     The door lock device  1 F is mounted in the front door FD and comprises an engagement unit  2  that comprises an engagement mechanism that engages with a striker S of the vehicle body to hold the front door FD closed and an operating unit  3  that comprises a locking mechanism that comprises mechanical elements such as a lever and a link with which the front door FD is switched to a lock state or an unlock state. 
     In  FIG. 5 , the engagement unit  2  comprises, as main elements, a body  4  fixed at a rear end of the front door FD with a plurality of bolts (not shown); an engagement mechanism (not numbered) housed in the body  4  and including a latch  5  that can engage with a striker S fixed to the vehicle body and a ratchet  6  that can engage with the latch  5 ; and an opening lever  7  that can release the ratchet  6  from the latch  5  in  FIG. 4 . 
     The latch  5  is pivotally mounted in the body  4  via a latch shaft  8  that lies longitudinally of the vehicle, and comprises a full-latch engagement portion  51  and a half-latch engagement portion  52  with which the ratchet  6  can engage; and an engagement groove  53  in which the striker S that enters into a striker-entering groove  41  of the body  4  can engage. 
     In  FIG. 5 , the striker-entering groove  41  of the body  4  is a little higher than a vertically middle portion and is open inward of the vehicle to extend outward of the vehicle. A symbol “X” in  FIG. 5  stands for a striker-entering line along which the striker S enters the striker-entering groove  41  and engages with the engagement groove  53  of the latch  5  to close the front door FD. 
     With a closing motion of the front door FD, the latch  5  rotates counterclockwise against a spring (not shown) by a certain angle from an open position (to which the latch  5  rotates from a position in  FIG. 5  clockwise) in which it does not engage from the striker S with the front door FD open, to a half-latch position for a slightly-engaging state where the engagement groove  53  slightly engages with the striker S that comes into the striker entering groove  41  along the striker-entering line X from a left in  FIG. 5  and to a full-latch position in  FIG. 5  for a fully-closed state in which the striker S fully engages with the engagement groove  53 . The latch  5  rotate vice versa as the striker S goes out of the striker-entering groove  41  with an opening motion of the front door FD. 
     The ratchet  6  is pivotally mounted within the body  4  via a ratchet shaft  9  which lies longitudinally of the vehicle below the striker entering groove  41  and is urged by a spring (not shown) in an engaging direction (counterclockwise in  FIG. 5  and in a direction for engaging with the full-latch engagement portion  51  or the half-latch engagement portion  52 ). The ratchet  6  engages with the full-latch engagement portion  51  to hold the front door FD fully closed and engages with the half-latch engagement portion  52  to hold the front door FD not fully closed. 
     In  FIG. 4 , the opening lever  7  is pivotally mounted via an axis for the ratchet  6  on a front surface of the body  4  so as to rotate together with the ratchet  6 , and is released (or rotated counterclockwise in  FIG. 4 ) to disengage the ratchet  6  from the latch  5 . A released portion  71  is formed at an end of the opening lever  7  extending inward of the vehicle. 
     The operating unit  3  will be described. 
     In  FIG. 4 , the operating unit  3  comprises a first L-shaped synthetic-resin cover  10  fixed to the body  4  to cover a front surface of the body  4 ; a second synthetic-resin cover  11  closing a side of the first cover  10  toward the inside of the vehicle; a synthetic-resin waterproof side cover  12  for closing an upper half of the second cover  11 ; a waterproof top cover  13  covering an upper joining surface between the first cover  10  and the second cover  11 ; and an operating mechanism (not numbered) housed inside the housing. 
     “Inside the housing” in the description means a space formed between a side of the first cover  10  substantially perpendicular to the front surface of the body and a side of the second cover  11  facing the side of the first cover  10 . 
     The operating mechanism comprises a locking motor  14  as a drive source for the locking mechanism; a locking worm wheel  15  reversibly rotated by the locking motor  14 ; a locking lever  16  that can move between an unlock position for enabling the door to open with the outside handle OH and a lock position for enabling the door not to open; an open link  18  that can move to unlock position and a lock position with the locking lever  16 ; an inside lever  19  connected to the inside handle IH; a key lever  20  connected to the key cylinder KC; an outside lever  21  connected to the outside handle OH; a releasing motor  22  as a drive source for an electric releasing mechanism; a releasing worm wheel  23  that can be rotated by the releasing motor  22 ; an electric releasing lever  24  that releases (or rotates counterclockwise in  FIG. 6 ) by rotating the releasing worm wheel  23 ; and a wiring member  25  with wires electrically connected to the locking motor  14 , the releasing motor  22  and the switches. A space between the second cover  11  and the waterproof side cover  12  has a knob lever  17  connected to the manually-operated locking knob on the front door FD inside the vehicle. The knob lever will not be provided if the locking knob is not provided. 
     The locking mechanism in this embodiment comprises the locking motor  14  as a drive source; the locking worm wheel  15 , the locking lever  16  and the open link  18  as mechanical elements. 
     “The unlock state” in the following description means that the locking lever  16 , the knob lever  17  and the open link  18  are in the unlock position respectively, and “the lock state” means that the locking lever  16 , and the knob lever  17  and the open link  18  are in the lock position respectively. The locking mechanism is not limited to the present embodiment, but may be modified. 
     The electric releasing mechanism comprises the releasing motor  22  as the drive source; the releasing worm wheel  23  and the electric releasing lever  24 . 
     The locking motor  14  is housed in the housing, and a case  14   a  (yoke) for the locking motor  14  is above the striker-entering line X in  FIG. 5 . An output shaft  14   b  pivotally connected to the case  14   a  is directed downward. Thus, rainwater which comes through the striker-entering groove  41  is prevented from flowing into the case  14   a  for the locking motor  14 . 
     The wiring member  25  is integrally formed with a coupler  25  connected to an in-vehicle battery (not shown) and an external connector (not shown) connected to ECU. On a side toward an outside of the vehicle, circuits for supplying power and signals into the housing are made, and the wiring member  25  is fixed in the housing to cover the case  14   a  for the locking motor  14 . The circuits on the wiring member  25  are electrically connected to terminals of the locking motor  14  and the releasing motor  22 , and to the external connector connected to the coupler  251  so that the locking motor  14  and the releasing motor  22  are controlled by ECU.  FIG. 3  clearly shows an internal structure of the operating unit  3  without the wiring member  25 . 
     In  FIG. 6 , the locking worm wheel  15  is pivotally mounted in the housing via a shaft  26  below the case  14   a  for the locking motor  14  and meshes with a worm  141  fixed on the output shaft  14   b  of the locking motor  14 . Hence, the worm wheel  15  is rotated by the locking motor  14  clockwise or counterclockwise from a neutral position (such as a position in  FIG. 6 ) against the spring  27  (in  FIG. 4 ) wound in the shaft  26 . When the locking motor  14  stops, the worm wheel  15  returns to the neutral position again from a position to which it is rotated by the spring  27 . 
     The knob lever  17  is pivotally mounted to a side of the second cover  11  via a shaft  111  of the second cover  11 . A connecting arm  171  that extends downward is connected to the manually-operated locking knob via a connecting member  28  that comprises a Bowden cable, and the knob lever  17  is rotated to, for example, an unlock position in  FIG. 6  and a lock position in  FIG. 7  to which it rotates counterclockwise by a certain angle from the unlock position, by unlocking action or locking action of the locking knob. The action of the locking knob is transmitted to the locking lever  16  and the open link  18  via the knob lever  17  as described later. The connecting member  28  will not be provided if the locking knob is not provided. 
     A waterproof side cover  12  is fixed to an outer side of the second cover  11  after the knob lever  17  is attached to the second cover  11 , thereby closing part of the outer side of the second cover  11  including an area where the knob lever  17  is disposed, and preventing rainwater from coming into the housing. 
     The locking lever  16  is pivotally mounted in the housing via a shaft  101  provided on an inner side surface and extending inward of the vehicle. Teeth of the locking lever  16  mesh with teeth  151  of the worm wheel  15 , and an upper part is coupled to the key lever  20 . A connecting projection  162  on a front upper part is coupled in a connecting hole  172  of the knob lever  17  through an arc-shaped hole  112  of the second cover  11 . The locking lever  16  has an arm  164  with a guide wall  165  that extends downward from a rotation center. The shaft  101  or the rotation center of the locking lever  16  is positioned above the striker-entering line X in the housing. 
     Based on rotation of the key lever  20  with the key cylinder KC, rotation of the knob lever  17  with the locking knob and rotation of the locking worm wheel with the locking motor  14 , the locking lever  16  can rotate to the unlock position in  FIG. 6  and the lock position in  FIG. 7  to which it rotates from the unlock position clockwise by a certain angle and is elastically held in the unlock and lock positions by an elastic force of the holding member  29 . When the locking worm wheel  15  is in the neutral position, the teeth  161  of the locking lever  16  do not mesh with the teeth  151  of the locking worm wheel  15 , so that the rotation of the locking lever  16  with the locking knob and the key cylinder KC is not transmitted to the locking worm wheel  15 . 
     The holding member  29  that is a torsion spring has a coil supported a cylindrical support  102  (in  FIG. 4 ) integrally formed with an inner side of the first cover  10 ; and two arms that surround the connecting projection  162  of the locking lever  16 . Thus, in order to rotate the locking lever  16  from the unlock position (or the lock position) to the lock position (or the unlock position), a forcing direction is changed from an unlock direction (or a lock direction) to a lock direction (or an unlock direction) at an intermediate position between the unlock position and the lock position. 
     The locking lever  16  is stopped at the unlock position and the lock position by contacting a part of the locking lever with a rubber stopper (not shown) fixed on the inner side of the first cover  10 . 
     On an upper outer circumferential surface of the locking lever  16 , there is formed a cam surface  163  which contacts a detecting portion of a locking/unlocking detecting switch SW 7  of the wiring member  25 . With rotation of the locking lever  16 , the detecting portion of the locking/unlocking detecting switch SW 7  comes in sliding contact with the cam surface  163  to supply a signal corresponding to the unlock/lock state of the locking mechanism. The supplied signal is transmitted to ECU via the circuits on the wiring member  25 . 
     The open link  18  has a drum-like connecting hole  182  at a lower rotary portion  181 . A plate-like connecting portion  211  of the outside lever  21  is inserted into the connecting hole  182 . Thus, the open link  18  is connected to the connecting portion  211  of the outside lever  21  to rotate by a certain angle longitudinally of the vehicle, and the upper connecting projection  183  is connected to the arm  164  of the locking lever  16  as described later. With movement of the locking lever  16  to the unlock position and the lock position, the open link  18  rotates to the unlock position (in  FIG. 6 ) and the lock position (in  FIG. 7 ) to which it rotates counterclockwise by a certain angle from the unlock position around the connecting portion  211  of the outside lever  21 . 
     Furthermore, in the unlock position in  FIG. 6 , in the middle, the open link  18  has a releasing portion  184  which can contact the released portion  71  of the opening lever  7  from below. A torsion spring  36  is disposed at the rotary portion  181  of the open link  18 . 
     One end of the torsion spring  36  engages with the open link  18 , and the other end engages with the connecting portion  211  of the outside lever  21 . Hence, the torsion spring  36  applies to the open link  18  an urging force in an unlock direction (clockwise in  FIG. 6 ) around the connecting portion  211  of the outside lever  21  anytime. The urging force of the torsion spring  36  is set to be smaller than a force of the holding member  29  elastically holding the locking lever  16  in the lock position. 
     The connecting projection  183  of the open link  18  is connected to the arm  164  of the locking lever  16  such that it can slide vertically on the arm  164  of the locking lever  16  and can contact the guide wall  165  only at rotation of the locking lever  16  in the lock direction (counterclockwise in  FIG. 6 ). 
     In the unlock state in  FIG. 6 , when the locking lever  16  rotates to the lock position, the open link  18  rotates from the unlock position to the lock position in  FIG. 7  by contacting the guide wall  165  of the locking lever  16  with the connecting projection  183  of the open link  18 . In the lock state in  FIG. 7 , when the locking lever  16  rotates to the unlock position, the open link  18  is rotated from the lock position to the unlock position in  FIG. 6  with rotation of the locking lever  16  by the torsion spring  36  without depending on a contact relationship between the guide wall  165  and the connecting projection  183 . 
     In the lock state in  FIG. 7 , the urging force of the torsion spring  36  exerts on the locking lever  16  in an unlocking direction (clockwise). The urging force of the torsion spring  36  is smaller than an elastic holding force for holding the locking lever  16  in a lock position with the holding member  29 . So the locking lever  16  and the open link  18  are not rotated to the unlock position by the torsion spring  36 . 
     The outside lever  21  is pivotally mounted to a front lower part of the body  4  via a shaft  31  that extends longitudinally of the vehicle to rotate vertically, and the connecting portion  211  is connected to the open link  18  as mentioned above. A connecting portion  212  is connected to the outside handle OH via a vertical connecting member (not shown). The outside lever  21  rotates by a certain angle against the spring (not shown) in a releasing direction (counterclockwise in  FIG. 4 ), thereby releasing the open link  18  upward. 
     The releasing motor  22  is disposed in the housing. A case  22   a  (yoke) for the motor  22  is lower than the striker entering line X, and an output shaft  22   b  pivotally mounted to the case  22   a  is disposed downward and backward obliquely. 
     The releasing motor  22  is positioned below the striker entering line X. Rainwater which comes through the striker entering groove  41  is likely to be put on the releasing motor  22 , which is positioned downward and backward obliquely, so rainwater into the case  22   a  can be held at the minimum. 
     The releasing worm wheel  23  is like a disc and is pivotally mounted in the housing via a shaft  39  that lies transversely of the vehicle. The releasing worm wheel  23  meshes with a worm  221  fixed to the output shaft  22   b  pivotally mounted to the case  22   a  of the releasing motor  22 . The releasing worm wheel  23  is rotated by the releasing motor  22  against a spring  35  (in  FIG. 4 ) wound on a shaft  39  clockwise from a set position (for example, in  FIG. 6 ) by a certain angle to a position in  FIG. 8 , and returns to the set position from the position where it is rotated by the spring  35  when the releasing motor  22  stops. On the releasing worm wheel  23 , there is a cam surface  231  with an involute curve in which a distance from an axis to an outer circumferential surface gradually increases counterclockwise in  FIG. 6 . 
     In the housing, the electric releasing lever  24  is pivotally mounted in the middle via a shaft  103  in the housing, and comprises a first arm  241  which extends forward such that an end can come in sliding contact with the cam surface  231  of the releasing worm wheel  23 , and a second arm  242  which extends backward so that an end can come in contact with the released portion  71  of the opening lever  7  from below. 
     In  FIG. 6 , when the releasing worm wheel  23  is in the set position, the end of the first arm  241  of the electric release lever  24  comes in contact with a smaller-diameter portion of the cam surface  231 , and the electric release lever  24  is thus held in a set position in  FIG. 6 . By the releasing motor  22 , the releasing worm wheel  23  is rotated clockwise from the set position in  FIG. 6  by a certain angle to the release position in  FIG. 8 . The end of the first arm  241  of the electric release lever  24  slides on the cam surface  231  to a larger-diameter portion of the cam surface  31 . Hence, the electric release lever  24  rotates to a releasing position in  FIG. 8 , and the end of the second arm  242  comes in contact with the released portion  71  of the opening lever  7  from below. The opening lever  7  is released to disengage the latch  5  from the ratchet  6 , and the front door FD can be opened. 
     In the housing, the inside lever  19  is pivotally mounted via the shaft  103  for the electric release lever  24 , and comprises a first arm  191  that extends upward and projects outward through an arc-shaped opening  113  (in  FIG. 3 ); a second arm  192  that extends downward and backward obliquely; and an unlocking portion  193  that can contact part  173  of the connecting arm  171  of the knob lever  17 . An upper part of the first arm  191  is connected to the inside handle IH of the front door FD via a connecting member  33  comprising a Bowden cable, and the inside lever  19  is rotated by a certain angle counterclockwise from the set position in  FIG. 6  against a spring  34  wound on the shaft  103  and released in  FIG. 10 . 
     At an end of the second arm  192 , there is formed a contact portion  192   a  which can contact the rotary portion  181  of the open link  18  from below when the inside lever  19  is released. 
     The connecting member  33  is connected to an upper part of the first arm  191  of the inside lever  19  through between the case  14   a  for the locking motor  14  and the case  22   a  for the releasing motor  22  in the housing. Hence, transversely of the vehicle, the connecting member  33  does not overlap the cases  14   a ,  22   a  which are thick transversely of the vehicle, thereby reducing thickness of the housing transversely of the vehicle. 
     In  FIGS. 12 to 14 , a door lock device  1 R for a rear door RD will be described. 
     The door lock device  1 R comprises an engagement unit  2  (not shown) which is the same as the engagement unit  2  of the door lock device  1 F, and an operating unit  3  that is partially different from the operating unit  3  for the door lock device  1 F. The door lock device  1 R will be described only on differences from the door lock device  1 F. 
     Instead of the inside lever  19  in the door lock device  1 F, the door lock device  1 R comprises a first inside lever  19 A, a second inside lever  19 B, a childproof lever  19 C of a childproof mechanism and a connect link  19 D. 
     The first and second inside levers  19 A,  19 B are supported on the shaft  103  for an electric release lever  24 . 
     In the first inside lever  19 A, an upper end of a first arm  191 A extending upward is connected to the inside handle IH of the rear door RD via the connecting member  33 . The inside lever  19 A is released counterclockwise from a set position in  FIG. 13  according to a door-opening action of the inside handle IH. An L-shaped control hole  195  is formed in the first inside lever  19 A. 
     The second inside lever  19 B has a vertically elongate hole  196  which partially overlaps the control hole  195  of the first inside lever  19 A; and a contact portion  192   a B. 
     The childproof lever  19 C is pivotally mounted in the housing via a shaft  104 , and can rotate between a childproof unlock position in  FIG. 13  and a childproof lock position in  FIG. 14  to which it rotates counterclockwise by a certain angle from the childproof unlock position. The childproof lever  19 C has an arc-shaped hole  197  formed longitudinally of the vehicle at a front part, and an operating portion  198  which projects from a rear end of the rear door RD, at a rear part. 
     A vertically elongate hole  19 Da in the middle of the connect link  19 D engages on the shaft  103  to slide vertically. A lower projection  19 Db at a lower part slides in an arc-shaped hole  197  of the childproof lever  19 C, and an upper projection  19 Dc slides in the control hole  195  and the elongate hole  196 . Hence, when the childproof lever  19 C is in the childproof unlock position in  FIG. 12 , the upper projection  19 Dc engages in an upper narrower part of the control hole  195  to enable releasing of the first inside lever  19 A to transmit to the second inside lever  19 B, and when the childproof lever  19 C is in the childproof lock position in  FIG. 13 , the upper projection  19 Dc is positioned in a lower wider part of the control hole  195  not to enable releasing of the first inside lever  19 A to be transmitted to the second inside lever  19 B. 
     An electric circuit with ECU in this embodiment will be described. 
     In  FIG. 15 , ECU comprises a one-chip CPU comprising a ROM that stores a control program and a RAM that functions as a working area for CPU, and carries out a series of control processing based on the control program stored in ROM. ECU comprises an authenticating portion for checking an ID signal of a wireless communication conducted between a transmitter SW 6  and each of receivers R 1 , R 2 . The authenticating portion may separately be disposed from ECU. 
     Input ports of ECU are electrically connected to each of the receivers R 1 , R 2 ; external switches SW 1 , SW 2  for each of the doors; internal switches SW 2 , SW 4  for each of the doors; the cancelling switch SW 5 ; a locking-state detecting switch SW 7 ; a childproof-lock detecting switch SW 8  for detecting each state of the childproof mechanism; a vehicle speed sensor SW 9  for detecting vehicle speed; and an internal locking switch SW 11 , and each signal is fed into ECU. To output ports are connected the locking motor  14  and the releasing motor  22 . 
     The cancelling switch SW 5  is operated to switch between an unset state for enabling operation of the internal switches SW 2 , SW 4  on the doors except the front door at driver&#39;s seat, and a cancelling state for cancelling the operation. ECU receives an unset signal from the cancelling switch SW 5  to keep the unset state for enabling the operation of the internal switches SW 2 , SW 4  and receives a cancelling signal from the cancelling switch SW 5  to hold a canceling state for cancelling the operation the internal switches SW 2 , SW 4 . 
     The locking state detecting switch SW 7  that detects a state of the locking mechanism detects an unlock state to transmit an unlock signal to ECU and detects a lock state to transmit a lock signal to ECU respectively. 
     The childproof-lock-state detecting switch SW 8  that detects a state of the childproof mechanism detects a childproof unlock state to transmit a childproof unlock signal, and detects a childproof lock state to transmit a childproof lock signal to ECU respectively. 
     The vehicle speed sensor SW 9  that detects a stop and a run of the vehicle detects the stop or a speed less than a predetermined speed to transmit a stop signal to ECU and detects a speed over the predetermined speed to transmit a running signal to ECU respectively. 
     The internal locking switch SW 11  inside the vehicle transmits an unlock signal to ECU with unlocking, and a lock signal with locking to ECU respectively. When ECU receives the unlock signal, it carries out an unlocking control to the locking motor  14  to turn the locking mechanism to an unlock state, and when ECU receives a lock signal, it carries out locking control to the locking motor  14  to turn the locking mechanism to a lock state. 
     ECU receives each signal from the transmitter SW 6 , the cancelling switch SW 5 , the locking-state detecting switch SW 7 , the childproof lock state detecting switch SW 8  and the vehicle speed sensor SW 9 . Depending on receiving situation, ECU carries out turning control for enabling and cancelling a door-opening action of the switches SW 1  to SW 4  and the portable switch SW 10 , and receives a door-opening signal from the enabled switches SW 1  to SW 4  and the portable switch SW 10  to carry out a releasing control to the releasing motor  22  for the door. 
     Turning control of ECU is shown in  FIG. 16  for the front door FD, and in  FIG. 17  for the rear door RD. 
     In the column for “transmitter SW 6 ” in  FIGS. 16 and 17 , “authenticated” (outside vehicle)” means that it authenticates an ID signal between “external receiver R 1 ” and “transmitter SW  6 ” when a user with the transmitter SW 6  is within a predetermined area outside the vehicle, and “unauthenticated” means that the transmitter does not authenticate an ID signal from the transmitter SW 6  when it does not exist within a predetermined area outside the vehicle and within an interior of the vehicle, and “authenticated (inside vehicle)” means that it authenticates an ID signal between the internal receiver R 2  and the transmitter SW 6  when the transmitter SW 6  is inside the vehicle or a user is inside the vehicle. 
     With respect to  FIGS. 16 and 17 , ECU carries out turning control as below. 
     &lt;Front Door FD&gt; 
     In  FIG. 16 , in “AUTHENTICATED (OUTSIDE THE VEHICLE)” of the transmitter SW 6 , when the vehicle speed sensor SW 9  detects a stop of the vehicle V, the external switches SW 1  on the door at the driver&#39;s seat and the door at the passenger seat are enabled to operate regardless of a detected state of the cancelling switch SW 5  and locking-state detecting switch SW 7 . 
     In a cancelling state cancelled by the cancelling switch SW 5 , the internal switch SW 2  on the passenger door is not enabled to operate even when a stop signal is supplied from the vehicle speed sensor SW 9 . 
     In “NOT AUTHENTICATED” state of the transmitter SW 6 , the internal switches SW 2  on the door at the driver&#39;s seat and the door at the passenger seat are enabled to operate when the vehicle speed sensor SW 9  supplies a stop signal. Except this operation, all is cancelled. 
     In “AUTHENTICTED (INSIDE)” state of the transmitter SW 6 , the external switches SW 1  on the door at the driver&#39;s seat and the door at the passenger seat are enabled to operate when the locking-state detecting switch SW 7  detects an unlock state, but when it detects a lock state, they are cancelled. Thus, the door is unlikely to be opened unexpectedly by a person outside the vehicle when a user is inside the vehicle. 
     &lt;Rear Door&gt; 
     In a “AUTHENTICATED (OUTSIDE)” for the transmitter SW 6 ″ in  FIG. 17 , the external switch SW 3  and portable switch SW 10  are enabled to operate regardless of a detected state of the locking-state detecting switch SW 7  and childproof-lock-state detecting switch SW 8  when the vehicle speed sensor SW 9  supplies a stop signal. 
     When the childproof-lock-state detecting switch SW 8  detects a childproof lock state, the internal switch SW 4  is cancelled regardless of a detected state of the locking-state-detecting switch SW 7  and vehicle speed sensor SW 9 . Thus, the internal switch SW 4  is prevented from being operated by a child in error. 
     In “UNAUTHENTICATED” state of the transmitter SW 6 , when unset state is held by the cancelling switch SW 5 , the internal switch SW 4  is enabled to operate only when the vehicle speed sensor SW 9  supplies a stop signal. Except it, all is cancelled. Thus, even if a regular user is out of the vehicle, the passenger can open the rear door swiftly with the internal switch SW 2 . 
     In “AUTHENTICATED (INSIDE)” of the transmitter SW 6 , the external switch SW 3  is enabled to operate when the locking-state detecting switch SW 7  detects an unlock state, but is cancelled when it detects a lock state. Hence, the door is unlikely to be opened unexpectedly by a person outside the vehicle. 
     Main action of the door lock devices  1 F,  1 R will be described. 
     The following states are premised on the basis that each of the doors is closed, ECU authenticates an ID signal from the transmitter SW 6 , the vehicle sensor SW 9  supplies a stop signal, an unset state is held by the cancelling switch SW 5 , and the switches SW 1  to SW 4  are all enabled. 
     When the front door FD acts like the rear door RD, the front door FD will be described only. 
     &lt;When the Locking Mechanism is in an Unlock State and the Door is Tried with the Outside Handle OH (for the Front Door FD and the Rear Door RD)&gt; 
     The door is tried with the outside handle OH in an unlock state of the locking mechanism in  FIG. 6 , and a door-opening action is transmitted to the outside lever  21  via a connecting member (not shown), and the outside lever  21  is released. The open link  18  connected to the connecting portion  211  of the outside lever  21  is released upward from the set position in  FIG. 6 , and the releasing portion  184  comes in contact with the released portion  71  of the opening lever  7  from below. The opening lever  7  is released. Thus, the ratchet  6  disengages from the full-latch engagement portion  51  of the latch  5 , and the front door FD can be opened. Each of the doors can be opened with the outside handle OH regardless of enabling or cancelling of the external switches SW 1 , SW 3  when the locking mechanism is in an unlock state. 
     &lt;When the Locking Mechanism is in an Unlock State and the Inside Handle IH is Operated (for the Front Door FD and the Rear Door RD)&gt; 
     The door is tried with the inside handle IH in an unlock state of the locking mechanism in  FIG. 6 , and a door-opening action is transmitted to the inside lever  19  via the connecting member  33 . The inside lever  19  is released to rotate counterclockwise by a certain angle around the shaft  103  for the electric release lever  24 . In  FIG. 10 , the contact portion  192   a  of the first arm  192  comes in contact with the rotary portion  181  of the open link  18  thereby releasing the open link  18  upward. The open link  18  is released, and the releasing portion  184  comes in contact with the released portion  71  of the opening lever  7  from below. The opening lever  7  is rotated thereby releasing the engagement mechanism, and the front door FD can be opened. 
     &lt;When the Locking Mechanism is in a Lock State and the Outside Handle OH is Operated (for the Front Door FD and the Rear Door RD)&gt; 
     The door is tried with the outside handle OH in a lock state in  FIG. 7 , and the action is transmitted to the outside lever  21 . The open link  18  is released upward from the set position in  FIG. 7 . But the releasing portion  71  of the opening lever  7  swings in front of the released portion  71  without contacting to the released portion  91 , and the opening lever  7  is not released. The front door FD cannot be opened. 
     &lt;When the Locking Mechanism is in a Lock State and the Inside Handle IH is Operated (for the Front Door FD)&gt; 
     The door is tried with the inside handle IH in the lock state in  FIG. 7 , and the inside lever  19  is released counterclockwise in  FIG. 7  against the spring  34  from the set position in  FIG. 7 . In  FIG. 11 , the unlocking portion  193  of the inside lever  19  comes in contact with the part  173  of the knob lever  17 , thereby moving the locking lever  16  and the open link  18  from the lock position to the unlock position. 
     With releasing of the inside lever  19 , the open link  18  moves upward in front of the released portion  71  of the opening lever  7  without contacting to the released portion  71  and rotates with the locking lever  16  in an unlocking direction. In  FIG. 11 , part of the open link  18  comes in contact with part of the opening lever  7  from a direction where the opening lever  7  cannot rotate, and the open link  18  stops once just before the unlock position. The inside handle IH is returned to a non-operating position once, and the open link  18  moves downward. The part of the open link  18  leaves the part of the open lever  7 , and the open link  18  moves to the unlock position with the torsion spring  36 . Thus, the locking mechanism is completely shifted to the unlock state. Thereafter, the door is opened with the inside handle again, the engagement mechanism is released, and the front door FD can be opened. 
     &lt;When the Locking Mechanism is in the Unlock State and the Childproof Mechanism is in a Childproof Unlock State (for the Rear Door RD)&gt; 
     “Childproof unlock state” means that the childproof operating lever  19 C is in a childproof unlock position to enable an action of the first inside lever  19 A to be transmitted to the second inside lever  19 B, and “childproof lock state” means that the childproof operating lever  19 C is in a childproof lock position not to enable an action of the first inside lever  19 A to be transmitted to the second inside lever  19 B. 
     In  FIG. 13 , the door is tried with the inside handle IH, and the first inside lever  19 A rotates counterclockwise by a certain angle from the set position around the shaft  103 . The rotation is transmitted via the connect link  19 D to the second inside lever  19 B, which is released counterclockwise with the first inside lever  19 A. Thus, the contact portion  192   a B of the second inside lever  19 B comes in contact with a lower part of the rotary portion  181  of the open link  18  from below, and the open link  18  is released upward. The releasing portion  184  of the open link  18  comes in contact with the released portion  71  of the opening lever  7  from below to make the opening lever  7  rotate in a releasing direction, thereby releasing the engagement mechanism and enabling the rear door RD to open. 
     &lt;When the Locking Mechanism is in the Unlock State and the Childproof Mechanism is in the Childproof Lock State (for the Rear Door RD)&gt; 
     On the basis of a door-opening action of the inside handle IH in  FIG. 14 , the first inside lever  19 A is released, but the releasing action is not transmitted to the second inside lever  19 B. The rear door RD cannot be opened. The rear door RD can be opened with the outside handle OH, but cannot be opened with the inside handle IH. 
     &lt;When the Locking Mechanism is in the Unlock or Lock State, Open-Switch Portion of the External Switches SW 1 , SW 3  or Portable Switch SW 10  is Operated (for the Front Door FD or Rear Door RD)&gt; 
     ECU receives a door-opening signal from any one of the external switches SW 1 , SW 3  and portable switch SW 10 . In order to rotate the releasing worm wheel  23  of the opening door (door operated with the external switches SW 1 , SW 3  or a door selected with the portable switch SW 10 ) in a releasing direction (for example, clockwise in  FIG. 6 ), the releasing motor  22  is controlled for releasing. Regardless of a state of the locking mechanism, the electric release lever  24  rotates from the set position to a releasing position ( FIG. 8  in an unlock state and  FIG. 9  in a lock state) with rotation of the releasing worm wheel  23  in a releasing direction with sliding of the end of the first arm  241  along the cam surface  231  of the releasing worm wheel  23 . The end of the second arm  242  comes in contact with the released portion  71  of the opening lever  7  from below to make the opening lever  7  released. Thus, the engagement mechanism is released, and the opening door can be opened. 
     In this motion, the electric release lever  24  directly releases the opening lever  7  regardless of a state of the locking mechanism (including the childproof mechanism in the rear door RD). Thus, even when the locking mechanism is in a lock state, the opening door can be opened swiftly by the releasing motor  22  with a single door opening action of the external switches SW 1 , SW 3  or portable switch SW 10 . 
     &lt;When the Internal Switch SW 2  or SW 4  is Operated in an Unlock or Lock State of the Locking Mechanism (for the Front Door FD and Rear Door RD)&gt; 
     When ECU receives a door-opening signal from the internal switch SW 2  or SW 4 , ECU drives the releasing motor  22  for the opening door for releasing. Regardless of a state of the locking mechanism (including the childproof mechanism in the rear door RD), the electric release lever  24  is released, and the opening door can be opened with a single door-opening action of the internal switch SW 2  or SW 4 . 
     &lt;When a Door-Opening Action of the External Switch SW 1 , SW 3  or Portable Switch SW 10  is Carried Out Substantially Together with an Unlocking Action of the Internal Locking Switch SW 11  in a Lock State of the Locking Mechanism&gt; 
     ECU receives a door-opening signal from any one of the external switch SW 1 , SW 3  and portable switch SW 10 . Thus, the releasing motor  22  for the opening door is driven for releasing. ECU receives an unlocking signal from the internal locking switch SW 11  thereby unlocking the locking motor  14 . 
     So, the electric release lever  24  is released from the set position in  FIG. 8  regardless of the state of the locking mechanism. Meanwhile, substantially together with releasing of the electric release lever  24 , the locking mechanism turns from the lock state in  FIG. 7  to the unlock state by driving the locking motor  14 . As a result, in  FIG. 8 , the electric release lever  24  directly releases the opening lever  7 , while the locking mechanism turns from the lock state to the unlock state without contacting the opening lever  7 . Even if releasing of the electric release lever  14  is performed together with turning of the locking mechanism from the lock state to the unlock state, a panic phenomenon in which part of the open link  18  of the locking mechanism comes in contact with the opening lever  7  from a direction where the opening lever  7  cannot be rotated to stop the open link  18  once just before the unlock position does not occur. Thus, the door can be opened swiftly with a single door-opening action of the external switch SW 1 , SW 3  or portable switch SW 10 , and the locking mechanism can be switched to the unlock state securely. 
     One embodiment of the present invention is described as above, and various modifications and changes or their combination may be made to the embodiments without departing from the scope of the invention. 
     (1) The door is a sliding door supported on the side of the vehicle to open and close longitudinally of the vehicle. 
     (2) The door is electrically opened and closed by a door opening device with a motor as a drive source. The door opening device is controlled to open the door after releasing the engagement mechanism with a door-opening action of electric operating elements. 
     (3) In order to open a door in which a locking mechanism is locked by releasing the releasing motor  22 , the locking motor  14  is controlled for unlocking to turn the locking mechanism from a lock state to an unlock state just after releasing of the releasing motor  22 , after a predetermined time passes from finishing of releasing or when the open door is closed. 
     (4) Even when the authenticating portion does not authenticate an ID signal, a door can be opened by enabling a door opening of the external switches SW 1 , SW 3  for the door in an unlock state.