Door security system

Abstract

Door security system, comprising: a door locking device, including: a locking mechanism provided with a fork rotatable into a locking position for engaging a locking bolt on a vehicle body, into an open position for releasing an engagement state with the locking bolt, and into a semi-locking position between the locking position and the open position, and with a claw lever locking with the fork to position the fork in the locking position; a locking mechanism for rotating the fork positioned in the semi-locking position into the locking position; and a child safety mechanism for switching between an unlocking state that allows a locked state of the locking bolt to be released using the locking mechanism by operating an inner handle, and a locking state that does not allow the locked state to be released; a child safety lock state detector for determining whether the child safety lock mechanism is in the unlocked state or the locked state; and a controller for executing a child lock priority mode in which it is not possible to drive the locking mechanism when the child lock state detector detects the locking state.

Description

BACKGROUND OF THE INVENTIONTechnical Field of ApplicationThe present invention relates to a door securing system.Prior ArtDoor lock devices each equipped with a child lock mechanism that prevents a door from being opened by operating an inner handle are well known (see, e.g., JP 2005-273 173 A).Moreover, door locking devices each having a mechanism for automatically closing a door in the half-closed state are well known (see, e.g., JP 2017-101 412 A).The publication DE 11 2013 005 663 T5 relates to a lock with a rotary latch and a pawl. A latch has a link that connects between an unlocked position and a locked position, in which a release lever operates the pawl or disengages the release lever from the pawl. A driver rotates between an unlocking position and a locking position, in which the connecting member can move into the unlocked position or the connecting member rotates into the locked position. A bridging element rotates between an actuatable position and an unactuated position, in which the lever can engage the bridging element in order to unlock the driver or the lever separates from the bridging element. The latch is positionable in an unlocked state in which the link is unlocked, a locked state in which the link is locked, the follower is in the locking position and the bridging member is actuatable, and a second locked state in which the link is locked, the follower is in the locking position and the bridging member is non-actuatable.The child lock mechanism prevents the inner handle from being operated to open the door when a child is in the rear seat. Thus, when a door lock device equipped with a child lock mechanism is supplemented with a function of automatically closing a door in a half-closed state, the door lock device may result in a finger of the child being inserted and caught between the door and a vehicle body.SUMMARYThe present invention relates to a door lock device having both a child-proof function and an automatic half-close door closing function, and in which a finger cannot be caught between the half-close door and a vehicle body.The present invention provides a door lock system as a means for solving the above-described problem, the door lock system including: a door lock device having a lock mechanism provided with a fork rotatable in a lock position for engaging with a striker on a vehicle body, an open position for releasing an engagement state with the striker, and a half-lock position between the lock position and the open position, and a claw lever locked with the fork for positioning the fork in the lock position, a lock mechanism for rotationally driving the fork positioned in the half-lock position to the lock position, and a child lock mechanism for switching between an unlock state enabling to operate, a locked state of the striker using the locking mechanism by operating an inner handle and a locked state that does not allow the locked state to be released; a child lock state detector for determining whether the child lock mechanism is in the unlocked state or the locked state; and a controller for executing a child lock priority mode in which the locking mechanism is not allowed to be driven when the child lock state detector detects the locked state.This configuration does not allow the locking mechanism to be driven in the child lock priority mode so that the fork does not rotate from the half-lock position to the lock position. Thus, it is possible to reliably prevent a finger or the like from being caught between the door and the vehicle body.The controller preferably enables the child lock priority mode to be switched to a normal mode in which the locking mechanism can be driven.This configuration enables the door to be quickly closed in a half-closed state by selecting the normal mode in a state in which a finger or the like is prevented from being caught between the door and the vehicle body.It is preferable to provide a mode selection switch for switching between the normal mode and the child lock priority mode.With this configuration, it is possible to easily switch between the normal mode and the child lock priority mode.It is preferable to provide an automatic opening / closing device that automatically opens or closes the door with respect to the vehicle body, and the controller preferably stops the door in a half-closed state when the door is operated to close by the automatic opening / closing device in the child lock priority mode.With this configuration, even a door of a type that can be automatically opened and closed, such as a slide door, can be configured to prevent a finger or the like from being caught between the door and the vehicle body.The present invention makes it possible to prevent the automatic closing function from being performed in the child lock priority mode even when there is both an child lock function that does not allow a locked state of the striker and the fork to be released by operating the inner handle and an automatic closing function that automatically rotates the fork to the locking position in the half locking position. This prevents a finger or the like from being caught between the door and the vehicle body, so that the door can be used safely.BRIEF DESCRIPTION OF THE FIGURESThe foregoing and other features of the present invention will become apparent from the following description and figures of an exemplary embodiment of the invention. The following are shown: FIG. 1 is a schematic front view of a door provided with a door locking device according to the present embodiment; FIG. 2 is a perspective view with a cover and the like of the door lock device illustrated in FIG. 1 removed to visualize the internal components; FIG. 3 is a front view of the door lock device shown in FIG. 2; FIG. 4 is a side view of FIG. 2; FIG. 5 is a front view of a main lock mechanism and a lock mechanism of the door lock device shown in FIG. 2 ; FIG. 6 is a side view of FIG. 5 ; FIG. 7 is a front view of a partial locking mechanism shown in FIG. 2 in an unlocked state; FIG. 8 is a front view of the partial locking mechanism shown in FIG. 7 in the locked state; FIG. 9 is a block diagram of a door securing system according to the present embodiment; FIG. 10 is a flowchart illustrating an automatic closing operation performed by a controller of FIG. 9 ; and FIG. 11 is a flow chart showing a child lock method of FIG. 9 executed by the controller.DETAILED DESCRIPTION OF EMBODIMENTSHereinafter, an embodiment according to the present invention will be described with reference to accompanying drawings. The following description is merely exemplary in nature and is not intended to mimic the invention, its application, or its use. In the following description, a vehicle front-rear direction may be described as an X direction, a vehicle width direction as a Y direction, and a vehicle height direction as a Z direction.Doors for a driver seat and a passenger seat in front of a vehicle are provided with a door locking device equipped with a closing mechanism described later. In contrast, a door for a rear seat in the rear portion of the vehicle is provided with a door locking device equipped with a locking mechanism and a child lock mechanism, which will be described later. That is, the child lock mechanism is provided only in the door for the rear seat.FIG. 1 shows a door 1 on a rear side provided with a door locking device 4 according to the present embodiment. The door 1 is provided with an outer handle 2 and an inner handle 3. The door 1 is rotatably fixed to a vehicle body by a hinge (not shown).As shown in FIG. 2, the door lock device 4 includes a housing 5 internally provided with a lock mechanism 6, an opening mechanism 7, a main securing mechanism 8, a sub securing mechanism 9, and a closing mechanism 10. The door lock device 4 is electrically connected to a vehicle-mounted electronic control unit (ECU) 11 and is driven in response to a control signal from the ECU 11.(Housing 5)The housing 5 is made of resin and includes a first accommodating portion 12 disposed along an end surface (generally, a YZ plane) of the door 1, and a second accommodating portion 13 disposed along an inner panel (an XZ plane) of the door 1.As illustrated in FIGS. 3 and 4, the first accommodating portion 12 includes a stopper block 14 made of resin. The stopper block 14 is arranged with the lock mechanism 6, a portion of the opening mechanism 7, and a portion of the main securing mechanism 8. The stopper block 14 is also provided with an insertion groove 16 into which a locking bolt 15 is inserted. The insertion groove 16 opens outward in the X direction and toward the vehicle interior in the Y direction, so that a substantially U-shape is formed.The second receiving portion 13 is arranged with another portion of the opening mechanism 7, another portion of the main securing mechanism 8 and the sub securing mechanism 9. The stopper block 14 has an end face partially covered with a metal cover 17. The cover 17 is provided with an insertion groove 18 at a position corresponding to the insertion groove 16. The second accommodating portion 13 is covered with a cover 19 made of resin (see FIG. 1 ).(Locking mechanism 6)The lock mechanism 6 is configured to lock the striker 15 (see FIG. 4 ) disposed on the vehicle body by closing the door 1 relative to the vehicle body and keep the door 1 in a closed state.As shown in FIG. 2, the lock mechanism 6 includes a fork 20 and a pawl lever 21.As illustrated in FIG. 6, the fork 20 has a substantially U-shape including a first arm portion 22 located outside the vehicle and a second arm portion 23 located inside the vehicle, and is rotatably fixed to the stopper block 14 about a rotation shaft 20 a. The first arm portion 22 and the second arm portion 23 have outer edges respectively formed with a first lock receiving portion 24 and a second lock receiving portion 25 for engaging or disengaging from the below-described claw lever 21. The fork 20 is urged clockwise about the rotating shaft 20a by a spring (not shown) to be rotated to the open position. The fork 20 is pushed in the open position by the striker 15 having entered the insertion groove 16 to be rotated counterclockwise. The fork 20 is locked with the striker 15 in the half-locking position and maintains the door 1 in a closed state in the locking position. The fork 20 located in the half-lock position and the fork 20 located in the lock position are detected by a half-lock position detection switch 26 and a lock position detection switch 27, respectively (see FIG. 9 ). The fork 20 has an outer edge provided with a pressure receiving portion 28. The fork 20 is configured to be rotatable counterclockwise about the rotation shaft 20 ain the figure by pressing the pressure receiving portion 28 by the below-described closing mechanism 10.The pawl lever 21 is rotatably fixed to the stopper block 14 about the rotation axis 21a and is urged counterclockwise about the rotation axis 21a by a spring (not shown). The claw lever 21 has an outer edge provided with a locking portion 29 that engages and disengages the first locking receiving portion 24 and the second locking receiving portion 25 of the fork 20. The locking portion 29 is locked to the first fuse receiving portion 24 by rotating the fork 20 to the half locking position, and is locked to the second fuse receiving portion 25 by rotating the fork 20 to the locking position. The fuse portion 29 is locked to the first fuse receiving portion 24 to form a half-closed state, and is locked to the second fuse receiving portion 25 to form the closed state.(Opening / closing mechanism)As shown in FIG. 2, the opening mechanism 7 includes an opening lever 30 connected to the same rotation axis 21a as the claw lever 21, a link 31 for operating the opening lever 30, and an outer lever 32 and an inner lever 33 for operating the link 31.The outer lever 32 includes a first link lever 34 connected to the outer handle 2 via a wire (not shown), and a first operation lever 35 attached to the link 31.The inner lever 33 includes a second link lever 36 connected to the inner handle 3 via a wire (not shown) and a second operating lever 37 for operating the link 31, which levers are rotatably attached to a rotation shaft 33a protruding from the second receiving portion 13.As shown in FIG. 7, the second link lever 36 includes a tubular portion 38 rotatably supported by the rotating shaft 33 a, a first protruding portion 39 extending from the tubular portion 38 in one direction, and a second protruding portion 40 extending therefrom in the other direction. The first protruding portion 39 has an edge portion serving as a pressing edge 41 capable of pressing a first slider as described below. The second protruding portion 40 has a connecting portion 42 to which a wire (not shown) extending from the inner handle 3 is connected. The second link lever 36 is rotated about the rotation axis 33 aagainst clockwise from a rest position illustrated in FIG. 7 by operating the inner handle 3. Then, the pressing edge 41 presses a slider 82 positioned at a connection position as described below, and the second operation lever 37 is rotated by the slider 82.The second operation lever 37 includes a guide portion 44 and a pressing portion 45 and is rotatably supported by the rotation shaft 33 a. The guide portion 44 is formed with a guide groove 46 to form a U-shape. The pressing portion 45 extends further from one end of the guide portions 44 to allow the pressing of the link 31 (see FIG. 2 ).(Main Securing Mechanism 8)The main securing mechanism 8 switches the locking of the striker 15 by the locking mechanism 6 between an unlocking state in which the striker 15 can be released by operation of the outer handle 2 and the inner handle 3 and a locking state in which the striker 15 cannot be released. That is, the main securing mechanism 8 is configured to switch the operation of the inner handle 3 and the outer handle 2 between a valid state and an invalid state.As shown in FIGS. 2 and 5, the main securing mechanism 8 includes a first motor 4 7, a first worm gear 48, a first worm wheel 49, a rotor 50, a joint 51, and a first shift lever 52.The first worm gear 48 is fixed to an output shaft of the first motor 47. The first worm wheel 49 is rotatably fixed to the second receiving portion 13 about a rotation shaft 49a and engages with the first worm wheel 48. The rotor 50 is rotatably fixed to the second receiving portion 13 about a rotation shaft 50a and engages with the first worm wheel 49. The hinge 51 is disposed in the second receiving portion 13 and engages with the rotor 50. The first shift lever 52 is disposed on the stopper block 14 and connected to the hinge 51. The first switching lever 52 is rotatable to a position in which the link 31 can be moved to an unlocked position in which the link 31 can engage with the open lever 30, and to a position in which the link 31 can be moved to a locked position in which the link 31 cannot engage therewith.The emergency shaft 53 is configured to mechanically lock and drive the main securing mechanism 8 in an emergency in which the first motor 47 cannot be driven. The emergency shaft 53 is rotated by inserting a plate member (not shown) into an insertion hole 54 and rotating it clockwise. By rotating the emergency shaft 53, the hinge 51 is moved upward to rotate the first shift lever 52, and then the link 31 is moved to the lock position.(Sub-Securing Mechanism 9)The sub-securing mechanism 9 is configured to switch the locking of the striker 15 using the locking mechanism 6 between an unlocking state in which the striker 15 can be released by operation of the inner handle 3 (inner lever 33) and a locking state in which the striker 15 cannot be released. The sub-securing mechanism 9 can be used as, for example, a child securing mechanism when a small child is on board.As shown in FIGS. 7 and 8, the sub-securing mechanism 9 includes a second motor 55, a second worm gear 56, a second worm wheel 57, and a second shift lever 58.The second motor 55 is disposed in the second accommodating portion 13. The second motor 55 has an output shaft to which a second worm gear 56 is fixed.The second worm wheel 57 has a cylindrical portion 59 rotatably supported by a rotation shaft 57 aprotruding from the second receiving portion 13. From the cylindrical portion 59, a first gear portion 60, a second gear portion 61 and a contact portion 62 project radially outward. The first gear portion 60 fan-projects out of the cylindrical portion 59, and the second worm wheel 56 meshes with an outer periphery thereof. The second gear portion 61 protrudes from the cylindrical portion 59 in a semicircular ring shape, and a gear portion 74 of a first pivotable lever 64 engages with its outer periphery. The second gear portion 61 and the contact portion 62 are arranged on the same circumference, and these and the first gear portion 60 are arranged offset from each other in an axial direction. Near the second worm wheel 57, a microswitch 63 serving as a child-proof state detector is provided. The microswitch 63 is turned on by being pressed against the contact portion 62, and the second worm wheel 57 is rotated counterclockwise about the rotation shaft 57a.The second switching lever 58 includes the first pivotable lever 64 and a second pivotable lever 65 which are arranged overlapping each other in the Y direction.The first swingable lever 64 has a substantially round shape and includes a central tubular portion 66 rotatably supported by a rotating shaft 64a projecting from the housing 5. The first swingable lever 64 is provided in its outer peripheral portion with a first recessed portion 69 having a first edge portion 67 and a second edge portion 68 facing each other in its circumferential direction, and includes recessed portions 70 formed adjacent to the corresponding one of the first edge portion 67 and the second edge portion 68 in the circumferential direction, respectively. The first cut-out portion 69 defines corner portions, and a first contact portion 71 and a second contact portion 72 protrude upward from the respective corner portions. In the first recess portion 69, a stopper 73 fixed to the housing 5 is provided to regulate a rotation range of the first pivotable lever 64. Thereby, the first swingable lever 64 can rotate between a first operating position (FIG. 7 ) in which the first contact portion 71 comes into contact with the stopper 73 and a second operating position (FIG. 8 ) in which the second contact portion 72 comes into contact with the stopper 73. The outer peripheral portion of the first swingable lever 64 is partially provided with the gear portion 74 in a fan shape. The second gear portion 61 of the second worm wheel 57 meshes with the gear portion 74.The second swingable lever 65 includes a circular portion 75 and an arm portion 76 extending from the circular portion 75. The circular portion 75 is provided at its central portion with a bearing portion 77 and is rotatably supported by the tubular portion 38 of the first swingable lever 64. The circular portion 75 is provided in its outer peripheral portion with a second recessed portion 78. The second cut-out portion 78 defines corner portions, and a first contact portion 79 and a second contact portion 80 project downward from the respective corner portions. The stopper 73 is located in the second recess portion 78 and comes into contact with the first contact portion 79 or the second contact portion 80 to regulate a rotation range of the second pivotable lever 65. The first contact portion 79 comes into contact with the first edge portion 67 of the first pivotable lever 64, and the second contact portion 80 comes into contact with the second edge portion 68 thereof. Thereby, the second swingable lever 65 can rotate forward and backward as the first swingable lever 64 rotates forward and backward. The arm portion 76 is formed with an elongated hole 81 in which a slider 82 is slidably disposed. The slider 82 is moved in the guide groove 46 of the second operation lever 37 by rotating the second pivotable lever 65 between a locking position (FIG. 7 ) in which the second operation lever 37 can be rotated by rotating the second connection lever 36 and a non-connection position (FIG. 8 ) in which the second operation lever 37 cannot be rotated.(Shooting Mechanism 10)As shown in FIG. 6, the closing mechanism 10 includes a closing lever 83 rotatably disposed about a rotation shaft. The closing lever 83 has a pressing portion 84 protruding from its outer peripheral portion. The closing lever 83 is urged counterclockwise in the figure about a rotation shaft 83a by a spring (not shown). Then, when a third motor 91 (see FIG. 9 ) is driven in response to an operation signal from the ECU 11, the closing lever 83 rotates clockwise by means of a wire (not illustrated). When the closing lever 83 is rotated to allow the pressing portion 84 to press the pressure receiving portion 28 of the fork 20, the fork 20 can be rotated from the half-locking position to the locking position.As shown in FIG. 9, the controller 11 receives signals from a key 85 (portable device), an open switch 86, a close switch 87, a lock switch 88, an unlock switch 89, a child lock switch 90, a half lock position detecting switch 26, and a lock position detecting switch 27, a microswitch 63, a mode selection switch 92, and the like. The closing switch 87 is a toggle switch with which a user can set whether the closing mechanism 10 is to be operated. The child lock switch 90 is a toggle switch with which the user can set a state of the sub-lock mechanism 9. The mode selection switch 92 is a toggle switch for allowing the user to switch between the child lock priority mode and the normal mode, which will be described below.The ECU 11 outputs a drive signal to the first motor 47, the second motor 55, the third motor 91, and the like on the basis of these input signals, and controls the opening and closing of the door 1 as described below.That is, when an ON signal is received from the close switch 87, the ECU 11 turns on a close function to allow the closing mechanism 10 of the door lock device to be operated by each door. Then, when each door lock device receives an ON signal from the half lock position detecting switch 26, the third motor 91 is driven to handle the closing mechanism 10. In contrast, when the ECU 11 receives an OFF signal from the close switch 87, it turns off the closing function so that the closing mechanism 10 of the door lock device of each door cannot be driven. Even if each door lock device receives an ON signal from the half lock position detecting switch 26, the third motor 91 is not driven, so that the closing mechanism 10 cannot be operated.When the ECU 11 receives an ON signal from the child lock switch 90, the ECU 11 turns on the child lock function and drives the second motor 55 of the door lock device 4 of the rear seat door 1 to lock the sub-lock mechanism 9. On the other hand, when an OFF signal is received from the child lock switch 90, the ECU 11 turns off the child lock function and drives the second motor 55 of the door lock device 4 of the rear seat door 1 to unlock the sub-lock mechanism 9.(Operation)The control of opening and closing the door 1 using the ECU 11 will be described below. Here, an automatic closing operation that automatically closes the door 1 in a half-closed state and a child lock operation that allows the outer handle 2 to open the door 1 and does not allow the inner handle 3 to open the door 1 will be described.As illustrated in FIG. 10, the automatic closing operation is configured to determine whether the fork 20 is in the half-lock position by determining whether an ON signal is input from the half-lock position detection switch 26 (step S 1). When an ON signal is input from the half lock position detection switch 26, the third motor 91 is operated (step S2). When the third motor 91 is operated to rotate the close lever 83 clockwise in FIG. 6 by means of a wire (not shown), the pressing portion 84 presses the pressure receiving portion 28 of the fork 20, and it is then determined whether an ON signal is input from the lock position detecting switch 27 (step S3). When the ON signal is input from the lock position detecting switch 27, it is determined that the fork 20 has rotated from the half lock position to the lock position, and then the drive of the third motor 91 is stopped (step S4). This results in the door 1 automatically changing from a half-closed state to a closed state.As illustrated in FIG. 11, the child lock method is configured to determine whether an ON signal is input from the child lock switch 90 (step S 11). When the ON signal is input from the child lock switch 90, a drive signal is output to the second motor 55 to operate the motor and rotate forward (step S 12). When the second motor 55 is operated, the second worm wheel 57 is rotated counterclockwise about the rotation shaft 57 ain FIG. 7 by the second worm gear 56. The second worm wheel 57 is rotated to further rotate the first swingable lever 64 clockwise about the rotation shaft 64a. While the first swingable lever 64 is rotated, the second swingable lever 65 is also rotated clockwise about the rotating shaft 64a. This causes the slider 82 to move in the guide groove 46 of the second operating lever 37 to the non-connection position in which the second operating lever 37 cannot be rotated by the second connecting lever 36. Then, it is determined whether the micro switch 63 is turned on by the contact portion 62 (step S 13). When the microswitch 63 is turned on, it is determined that the door 1 is in a child-proof state. Then, the second motor 55 is stopped, and the result of the determination is displayed on a display or the like in the vehicle (step S14). From this display, the user can determine that the door 1 is in the child-proof state.In this case, the child lock priority mode does not allow the locking mechanism 10 to be driven even when the door 1 is in a half-closed state. That is, even when an ON signal is input from a half-closed position detection switch, no drive signal is output to the third motor 91 of the closing mechanism 10. Thereby, an occupant in the rear seat (mainly a child) can be prevented from being caught by mistake even if the occupant inserts his finger into a gap between the half-closed door 1 and the vehicle body. When closing the door 1, the user can manually close the door 1 after confirming that no finger or the like is caught between the door 1 and the vehicle body.The closing of the door 1 causes the child lock state, so that the door 1 cannot be opened even when the inner handle 3 is operated. That is, although the child lock state allows the rotation of the second link lever 36 by operating the inner handle 3, the slider 82 is moved to the non-link position in which the second operating lever 37 cannot be pressed by the second link lever 36. Thus, the link 31 cannot be operated by rotating the second operating lever 37, so that the lock mechanism 6 cannot be opened and driven with the opening mechanism 7. Thereby, the door 1 is held in the closed state.In contrast, when the outer handle 2 in the door 1 is operated in the closed state constituting the child lock state, the outer lever 32 is rotated to rotate the opening lever 30 by means of the link 31, as when the door 1 is opened in an unlocked state by means of the main lock mechanism 8. Thereby, a locked state of the fork 20 is released using the claw lever 21, so that the door 1 is opened.By operating the mode selection switch 92, both the child lock priority mode and the normal mode can be selected. Instead of the mode selection switch 92, the close switch 87 and the child lock switch 90 may each be used as a momentary switch to switch between the child lock priority mode and the normal mode by keeping each of the switches 87 and 90 pressed for a predetermined time or longer. In this case, a mode display unit for displaying a currently selected mode on an instrument panel or the like may be provided in the vehicle interior.As shown in Table 1, the child lock priority mode allows the door lock device closing mechanism 10 of each of the doors on a driver seat side and a passenger seat side to be operated as if the closing switch 87 is turned on, and allows operation of the door lock device closing mechanism 10 of a door for a rear seat and non-operation thereof to be switched in accordance with a state of the child lock mechanism. Specifically, the close switch 87 can be operated when the close switch 87 is turned on and the sub-securing mechanism 9 (child securing mechanism) is in an unlocked (off) state. In contrast, in a locked (on) state, even when the close switch 87 is turned on, the sub-securing mechanism 9 (child securing mechanism) does not allow the close mechanism 10 to be operated. When the closing mechanism 10 cannot be driven, the closing mechanism 10 is not driven even when the door 1 is in a half-closed state. [Table 1] Table 1] [Table 1] Table 1]Close SwitchChild Lock SwitchDriver's Door Closing MechanismRear Door Closing MechanismRear Door Child Lock MechanismA control unit.A control unit.◯×◯A control unit.Off◯◯×OffA control unit.××◯OffOff×××◯: operable x: not operableIn contrast, in the normal mode, as shown in Table 2, the closing mechanism 10 of the door lock device 4 of each door can be driven independently of a state of the sub-securing mechanism 9 when the closing switch 87 is turned on. When the closing mechanism 10 can be driven, the door 1 that is in a half-closed state enables the closing mechanism 10 to be automatically driven to close the door 1. [Table 2] [Table 2]Close SwitchChild Lock SwitchDriver's Door Closing MechanismRear Door Closing MechanismRear Door Child Lock MechanismA control unit.A control unit.◯◯◯A control unit.Off◯◯×OffA control unit.××◯OffOff×××◯: operable x: not operableThe present invention is not limited to the structure described in the above embodiment, and various modifications are available.Although a typical swing door is described in the above embodiment, the door securing system may be also used for the door 1 of another type such as a slide door or a sash door.When the door lock system is used for the sliding door, the door 1 may be configured to be automatically opened and closed. In this case, when the child lock switch 90 is operated, the door 1 is not closed but temporarily stopped in a half-locked state as described above. This can prevent a finger or the like from being caught between the door 1 and the vehicle body.Although in the above embodiment, the fork 20 is indirectly rotated by the closing mechanism 10, the rotating shaft of the fork 20 may be directly driven and rotated forward and backward by a motor via a transmission.Although in the above embodiment, the door 1 is brought into the child-proof state by operation of the child-proof switch 90, the door 1 may activate the child-proof state by manual operation. In this case, an operation knob may be provided at an open end of the door 1 (a portion concealed when the door 1 is closed), and the slider 82 may be directly or indirectly brought to the non-connection position by operation of the operation knob. A switch or a sensor for detecting an operation position of the operation button may allow detection of whether the operation button is operated.Although in the above embodiment, the child lock state detector is constituted by the microswitch 63 for detecting a state of the sub-lock mechanism 9, it may be constituted by the child lock switch 90 operated by a user. In this case, in the child lock priority mode, the ECU 11 may not allow the locking mechanism 10 to be driven when receiving an ON signal from the child lock switch 90, and may allow it to be driven when receiving an OFF signal therefrom.

Claims

A door lock system comprising: a door lock device including: a lock mechanism provided with a fork rotatable to a lock position for engaging a striker on a vehicle body, an open position for releasing an engagement state with the striker, and a half-lock position between the lock position and the open position, and a claw lever locked to the fork for positioning the fork in the lock position; a lock mechanism for rotationally driving the fork positioned in the half-lock position to the lock position; and a child lock mechanism for switching between an unlocked state that allows a locked state of the striker to be released by operating an inner handle using the locking mechanism and a locked state that does not allow the locked state to be released; a child lock state detector for determining whether the child lock mechanism is in the unlocked state or the locked state; and a controller for executing a child lock priority mode in which it is not possible to drive the locking mechanism when the child lock state detector detects the locked state.The door latch system of claim 1, wherein the controller enables the child lock priority mode to be switched to a normal mode such that the locking mechanism can be driven.The door latch system of claim 2, further comprising a mode selector operable to switch between normal operation and the child lock priority mode.The door lock system according to any one of claims 1 to 3, further comprising an automatic opening / closing device that automatically opens or closes the door with respect to the vehicle body, wherein the controller stops the door in a half-closed state when the door is operated to close by the automatic opening / closing device in the child lock priority mode.

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