Door latch device for vehicle

Abstract

To provide a door latch device for vehicles capable of efficiently using a space of a vehicle.SOLUTION: The door latch device for vehicles includes: a first door latch unit for performing lock and unlock of a door; a second door latch unit for performing lock and unlock of a door; a backup power supply that is provided to the first door latch unit for supplying the power to the actuator unit of the first vehicle door when the vehicle gets fault condition where power is not supplied from the main power supply; and an auxiliary power line that is provided to the first door latch unit for connecting the backup power supply and the second door latch unit.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a door latch device for a vehicle. [Background technology]

[0002] It is known that an electric door latch device is used in the doors of a vehicle such as an automobile. Conventionally, electric door latch devices are configured to supply power from a main power source installed in the vehicle through a power supply wiring to the door latch device provided in the door.

[0003] Meanwhile, door latch devices have been developed that are equipped with an emergency backup power source using a supercapacitor in case power to the door latch device from the main power source is cut off due to a vehicle accident or the like. For example, a door latch device according to this is described in JP2016-503135A. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2016-503135 Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional door latch device, a backup power supply using an emergency supercapacitor is installed in each door and supplies power only to the door latch of each door. Therefore, the backup power supply of each door can only obtain a limited power capacity. In addition, since a backup power supply is provided in every door, there are disadvantages in terms of space, cost, and weight. [Means for solving the problem]

[0006] A vehicle door latch device according to one embodiment of the present invention includes, for example, a first door latch device that locks and unlocks a door, a second door latch device that locks and unlocks a door, a main power supply unit that supplies power to the first door latch device and the second door latch device, an actuator unit provided in the first door latch device and a control unit that controls the actuator unit, an actuator unit provided in the second door latch device and a control unit that controls the actuator unit, a standby power supply unit provided in the first door latch device that supplies power to the actuator unit of the first vehicle door in a vehicle failure state in which power is not supplied from the main power supply, an auxiliary power supply line that connects the standby power supply unit provided in the first door latch device and the second door latch device, and a control line that connects the control unit provided in the first door latch device and the control unit provided in the door latch device of the second vehicle door, and the first door latch device is installed on a first vehicle door, and the second door latch device is installed on a second vehicle door.

[0007] In addition, the vehicle door latch device of one embodiment of the present invention is configured so that when the control unit of the second door latch device receives an unlock command from an operating unit in a vehicle failure state, it receives power supply from the standby power supply unit by sending a power supply request signal via the control line to the control unit of the first door latch device. Effect of the Invention

[0008] According to the vehicle door latch device of the present invention, it is possible to supply high-output, highly efficient power to the door latch device that requires it. Also, according to the present invention, the number of doors that are provided with a backup power supply can be limited to some of the doors, so that the space of the vehicle can be effectively utilized, costs can be suppressed, and / or the vehicle weight can be reduced. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram for explaining a vehicle door latch device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram for explaining a vehicle door latch device according to another embodiment of the present invention. [Diagram 3] FIG. 3 is a diagram for explaining a vehicle door latch device according to another embodiment of the present invention. [Figure 4] FIG. 4 is a diagram for explaining the operation of a vehicle door latch device according to another embodiment of the present invention. [Diagram 5] FIG. 5 is a diagram for explaining the operation of a vehicle door latch device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that duplicated explanations of elements common to the various drawings may be omitted.

[0011] Fig. 1 is a diagram for explaining a vehicle door latch device according to one embodiment of the present invention. The vehicle door latch device shown in Fig. 1 is installed in a vehicle 100 such as an automobile. The vehicle 100 has a main power source 101 that supplies power to each part of the vehicle 100, and a plurality of vehicle doors 110 and 120.

[0012] The vehicle door 110 has a door latch device 111 that locks and unlocks the vehicle door 110. The door latch device 111 has an actuator unit 112 composed of a door latch motor and the like, a control unit 114 that controls the driving of the actuator unit 111, and the actuator unit 112 and the control unit 114.

[0013] Similarly, the vehicle door 120 also has a door latch device 121 that locks and unlocks the vehicle door 120, an actuator unit 122 composed of a door latch motor and the like arranged in the door latch device 121, a control unit 124 that controls the drive of the actuator unit 121, and a standby power supply unit 125 that supplies power to the actuator unit 122 and the control unit 124.

[0014] Although not particularly limited, each control unit includes an arithmetic device such as a microprocessor.

[0015] Furthermore, the actuator units 112 and 122 each have, but are not limited to, a ratchet that can selectively rotate relative to a striker fixed to a door post, a pole that prevents the rotation of the ratchet, and a door latch motor that rotates the pole. The control units 114 and 124 each can include a driver circuit for driving and controlling the door latch motor of each actuator unit. In other embodiments, such a driver circuit can be configured as a part of the actuator unit. Here, a door latch motor is shown as an example of the actuator unit, but the actuator unit is not limited to a motor, and an actuator using a solenoid, etc. can also be used.

[0016] As described above, according to one embodiment of the present invention, the door latch device 111 is not provided with a backup power supply device, whereas the door latch device 121 is provided with a backup power supply device 125. In the following description, the door latch device provided with a backup power supply device may be referred to as a first door latch device, and the door latch device not provided with a door latch device may be referred to as a second door latch device.

[0017] A main power supply 101 provided in a vehicle 100 constantly supplies power to door latch devices 111 and 121 of each vehicle door via a power supply line 102. In Fig. 1, control units 114 and 124 are connected to the power supply line 102, and power is supplied to actuator units 112 and 122 via the control units 114 and 124. In another embodiment, the power supply line 102 may be independently connected to the actuator units 112 and 122. Although not particularly limited, the main power supply 101 may be a storage battery such as a lead storage battery that is widely used as an automobile battery.

[0018] The control unit 114 detects the operation of the operation unit 113 and controls the actuator unit 112 to lock or unlock the vehicle door 110.

[0019] The operation unit 113 is a door latch switch that allows occupants of the vehicle 100 to lock or unlock the doors, and includes an outer handle installed on the outside of the vehicle 100 and an inner handle located on the inside of the vehicle 100.

[0020] Although main power supply 101 is expected to supply power at all times, in an emergency such as a vehicle accident, the power supply from main power supply 101 may be cut off or the power supply may be interrupted due to a disconnection of power supply line 102. Backup power supply unit 125 disposed in the first door latch device provides power to door latch device 121, which is the first door latch device, as well as door latch device 111, which is the second door latch device that does not have a backup power supply unit, in the event of a vehicle malfunction such as when the main power supply is interrupted.

[0021] As described later, the backup power supply unit 125 is configured using, for example, a supercapacitor (sometimes called an ultracapacitor). The supercapacitor includes an electrolytic double layer capacitor, a pseudocapacitor, or a capacitor that is a combination of these. By providing such a backup power supply unit 125, power is supplied to the control unit and / or actuator unit of the door latch device when the main power supply is interrupted, and the actuator unit can be reliably operated even in a vehicle accident state, thereby ensuring good locking or unlocking of the vehicle door. In general, a supercapacitor has high energy density, high output current characteristics, and is relatively small in size, so that it is suitable as a backup power supply unit provided in a vehicle door, but is not limited thereto. The backup power supply unit can also be configured with a capacitance element other than a supercapacitor, and can also be configured with a secondary battery such as a nickel-metal hydride battery.

[0022] Here, in the vehicle door latch device according to one embodiment of the present invention, an auxiliary power supply line 104 is provided which connects a standby power supply unit 125 provided in the first door latch device 121 and the second door latch device 111. Furthermore, a control unit 124 provided in the first door latch device 121 and a control unit 114 provided in the second door latch device 111 are connected by a control line 103.

[0023] In this way, the vehicle door latch device according to one embodiment of the present invention includes a first door latch device for locking and unlocking the door, a second door latch device for locking and unlocking the door, a main power supply unit for supplying power to the first door latch device and the second door latch device, an actuator unit provided in the first door latch device and a control unit for controlling the actuator unit, an actuator unit provided in the second door latch device and a control unit for controlling the actuator unit, a standby power supply unit provided in the first door latch device for supplying power to the actuator unit of the first vehicle door in a vehicle failure state in which power is not supplied from the main power supply, and an auxiliary power line 104 connecting the standby power supply unit provided in the first door latch device and the second door latch device, thereby making it possible to supply standby power to multiple door latch devices by simply providing a standby power supply unit in one door latch device. Since a standby power supply unit is provided only in some door latch devices of the vehicle doors, the number of standby power supply units can be reduced, and the weight of the entire vehicle can also be reduced. The reduction in vehicle weight is expected to suppress consumption of the main power supply unit, especially in the case of an electric vehicle.

[0024] According to the vehicle door latch device of FIG. 1, the control unit provided in the first door latch device and the control unit provided in the door latch device of the second vehicle door are connected to each other by a control line 103. Although not particularly limited, an in-vehicle communication network using a multiplex communication technology can be used for such connection. A representative in-vehicle communication network is CAN (Controller Area Network), which is a serial communication protocol. As described above, according to this embodiment, since the control units are connected to each other by the in-vehicle communication network, they can communicate with each other, and when an unlocking command is received from the operation unit of one of the vehicle doors in a vehicle failure state, the control units can communicate with each other and control each other so that power is supplied to the door latch device of the one of the vehicle doors from the auxiliary power unit of the other vehicle door via the auxiliary power line.

[0025] Fig. 2 is a diagram for explaining a vehicle door latch device according to one embodiment of the present invention. In Fig. 1, a vehicle 100 has two vehicle doors, or at least two vehicle doors each have a door latch device, and the two door latch devices are connected by an auxiliary power line and a control line.

[0026] In the embodiment shown in Figure 2, a vehicle 200 has a main power source 201 and four vehicle doors 210, 220, 230 and 240. Each vehicle door has a door latch device 211, 221, 231 and 241 and an operator portion 213, 223, 233 and 243. Each door latch device has an actuator portion 212, 222, 232 and 242 and a control portion 214, 224, 234 and 244.

[0027] In this embodiment, a first door latch device having a backup power supply unit is provided on two rear vehicle doors 230 and 240. Also, a second door latch device not having a backup power supply unit is provided on two front vehicle doors 210 and 220.

[0028] The control units 214, 224, 234, and 244 of the vehicle doors are connected to each other via a control line 203. The standby power supply unit 235 of the vehicle door 230 is connected to the door latch devices 211 and 221 via an auxiliary power supply line 204, and the standby power supply unit 245 of the vehicle door 240 is connected to the door latch devices 211 and 221 via an auxiliary power supply line 205.

[0029] By its very nature, the backup power supply unit accumulates and holds a certain amount of power, and therefore has only a limited power supply capacity. According to this embodiment, each second door latch device can receive power from two backup power supply units in the event of a vehicle failure. Meanwhile, since the backup power supply units are provided only in some of the door latch devices of the vehicle doors, the number of backup power sources can be reduced, and the weight of the entire vehicle can also be reduced. As described above, reducing the vehicle weight is expected to suppress wear and tear on the main power supply unit, particularly in the case of an electric vehicle.

[0030] In this embodiment, the first door latch device is provided in the rear seat, which is less likely to be damaged in an accident, and this reduces the possibility that the backup power source will become unusable in the event of an accident.

[0031] However, the present invention is not limited to this, and the first door latch device may be provided in the front seat. Alternatively, a backup power source may be provided in the driver's seat in the front seat in addition to one of the rear seats or two rear seats, or a backup power source may be provided in the passenger seat side of the front seat in addition to one of the rear seats or two rear seats.

[0032] In addition, the first door latch device does not necessarily have to be provided on both seats, and may be provided on only one of the rear seats, and the second door latch device may be provided on the remaining vehicle door, for example, the third seat. In this case, the weight of the vehicle can be further reduced by reducing the number of first door latch devices provided.

[0033] 2, the auxiliary power supply line is configured as an independent power supply line, with auxiliary power supply line 204 supplying power from one first door latch device 230 and auxiliary power supply line 205 supplying power from another first door latch device 240. This makes it possible to supply power from the other auxiliary power supply line even if an abnormality such as a short circuit or disconnection occurs in one auxiliary power supply line. However, this is not limited to this, and it is also possible to configure the auxiliary power supply line to be commonly connected to a plurality of standby power supplies. In this case, the number of auxiliary power supply lines can be reduced, and the wiring structure of the vehicle can be simplified.

[0034] 2 illustrates a case where the vehicle 200 has four doors, but the present invention is not limited to this, and the number of vehicle doors may be two, three, or five or more. The vehicle doors illustrated in FIG. 1 or 2 may be any type of door that opens and closes, such as a normal type door that is rotatable relative to the vehicle, a sliding door, a double-door, or a gull-wing door, and the location of the first door latch device or the second door latch device may be changed as appropriate depending on the type, location, number, etc. of the door.

[0035] Fig. 3 is a diagram for explaining a vehicle door latch device according to an embodiment of the present invention. This diagram shows an example in which the vehicle has four doors, but similar to the case of Fig. 2, the present invention is not limited to this, and the same configuration can be applied to a vehicle with three doors or five or more doors.

[0036] The embodiment shown in Fig. 3 shows a more specific form of the embodiment described with reference to Fig. 1 or Fig. 2. Description of the same parts as those in Fig. 1 or Fig. 2 will be omitted.

[0037] 3 is installed in a vehicle 300. The vehicle 300 has a main power source 301 and a plurality of vehicle doors 310, 320, 330, and 340.

[0038] The vehicle doors 310, 320, 330, and 340 each have a door latch device 311, 321, 331, and 341 that locks and unlocks the vehicle door. The door latch devices each have an actuator unit 312, 322, 332, and 342 that is constituted by a door latch motor and the like, and a control unit 314, 324, 334, and 344 that controls the driving of the actuator unit. Although the door latch motor has been given as an example of the actuator unit, as described above, the present invention is not limited to this.

[0039] In this embodiment, first door latch devices 331 and 341 having backup power supplies 335 and 345 are provided on rear vehicle doors 330 and 340.

[0040] A main power supply 301 provided in a vehicle 300 constantly supplies power to the door latch devices of each vehicle door via a power supply line 302. As described above, the main power supply 301 can use a 12V lead-acid battery that is widely used as an automobile battery.

[0041] The control unit of each door latch device is supplied with power from the main power supply 301, and operates each actuator unit according to the operation status of each operation unit to lock or unlock the vehicle door.

[0042] Although not particularly limited, each control unit is configured to include a calculation device such as a microprocessor. As described above, each actuator unit has a ratchet that can selectively rotate relative to a striker fixed to the door post and a door latch motor that rotates the ratchet. Each control unit can include a driver circuit for driving and controlling the door latch motor of each actuator unit, and in other embodiments, the driver circuit can be configured as a part of the actuator unit.

[0043] A main power supply 301 constantly supplies power to each latch device of each vehicle door via a power supply line 302. In Fig. 3, each control unit is connected to the power supply line 302, and power is supplied to each actuator unit via each control unit, but in other embodiments, each actuator unit may be independently connected to a power supply line.

[0044] When a corresponding operating unit is operated, each control unit detects the operation and controls the corresponding actuator unit to lock or unlock the vehicle door. Each operating unit is a door latch switch that allows occupants of vehicle 300 to lock or unlock the doors, and includes an outer handle installed on the outside of vehicle 300 and an inner handle located on the inside of vehicle 300.

[0045] Each of the standby power supplies 335 and 345 is configured by connecting the above-mentioned supercapacitors in series. Although not particularly limited, the maximum operating voltage of such a capacitor is about 2.5V, and by connecting five of them in series, a total voltage of 12.5V can be generated.

[0046] According to another embodiment, it is also possible to provide an equivalent circuit that keeps the voltage stored in each capacitor constant by connecting a constant voltage element (not shown) such as a Zener diode in parallel with each capacitor.

[0047] According to another embodiment, the number of connected capacitors can be reduced to, for example, two, and a boost converter (not shown) for boosting the voltage of each standby power supply unit can be provided in each standby power supply unit or in each control unit. As the standby power supply unit, a capacitance element other than a supercapacitor or a secondary battery such as nickel-hydrogen can also be used. Although not particularly limited, since the nominal voltage of a nickel-hydrogen battery is about 1.2 V, when configuring a standby power supply unit using nickel-hydrogen batteries, about 10 of the batteries can be connected in series, or the number of batteries connected in series can be reduced and the above-mentioned boost converter can be provided.

[0048] One end of the standby power supply unit is connected to a ground potential, and the other end is connected to each control unit 334 or 344 via a standby power supply line 337 or 347. That is, each standby power supply unit is connected to the power supply line 302 via each control unit 314, 324, 334, and 344, and is configured to be charged by a charging circuit (not shown) provided in each control unit 314, 324, 334, and 344 in a normal state in which power is supplied from the main power supply 301.

[0049] In this embodiment, each of the first door latch devices further includes switching units 336 and 346. The switching unit 336 is disposed between the standby power line 337 and the auxiliary power line 304, and its opening and closing is controlled by the control unit 334 via a switching control line 338. The switching unit 346 is disposed between the standby power line 347 and the auxiliary power line 305, and its opening and closing is controlled by the control unit 344 via a switching control line 348. The switching unit can be configured, for example, by a relay element, a semiconductor relay, a power transistor, an FET, or the like. According to one example, the switching unit can be configured by connecting two MOSFETs back-to-back (source-common connection).

[0050] Hereinafter, the control and operation of the door latch device in this embodiment will be described with reference to Fig. 4 as well. The control units 334 and 344 of the first door latch device are connected to the main power supply 301 via the power supply line 302, and are configured to constantly or periodically monitor the voltage of the main power supply unit. This allows each control unit to determine whether the vehicle is in a normal state where power is being supplied from the main power supply, or in a vehicle failure state where the power supply from the main power supply is cut off (or in a main power supply failure state). Note that the control unit can also be configured to detect a state where the voltage of the main power supply has dropped to a certain level as a vehicle failure state, not limited to when power from the main power supply is completely cut off.

[0051] When the control unit detects a vehicle failure state (main power supply failure state) (step 401), at least in the first door latch device, power is automatically supplied from the respective backup power supplies to the control unit and the actuator unit. For convenience of explanation, the state in which power is supplied from the backup power supplies may be referred to as a backup mode.

[0052] As described in steps 431 and 441 of FIG. 4, a vehicle failure condition (main power failure condition) is detected by each controller 334 and 344 of each vehicle door 331 and 341, respectively, of FIG. 3, causing each controller to enter a backup mode.

[0053] Next, in the first door latch device, each control unit monitors the state of each auxiliary power line and determines whether or not power can be supplied (steps 432 and 442). If the auxiliary power line is found to be normal with no short circuit or disconnection and is determined to be capable of supplying power, the door latch device goes into supply line mode and intermittently turns on the corresponding switching unit to intermittently supply power to the corresponding auxiliary power line (steps 433 and 443).

[0054] This is because the second door latch device does not have a backup power supply and therefore requires power to drive each control unit of the second door latch device in the event of a main power failure. In this state, there is no need to drive the actuator unit, so the intermittent power supply can prevent power consumption of the backup power supply while ensuring the operation of the control unit of the second door latch device.

[0055] In another embodiment, the backup power supply may be configured to supply power continuously from the beginning. In this case, the power consumption of the backup power supply may be increased, but the power supply to the control unit of the second door latch device may be stable, and the second door latch device may be operated more reliably.

[0056] If an abnormality such as a short circuit or a break is found in the standby power line, the process is terminated (step 435 or 445). Here, as described in step 411, when the operating part of the vehicle door is operated, the sensor part (not shown) which is powered by the standby power supply part in the backup mode detects the operation and sends an operation detection signal indicating that the sensor part has detected the operation, and the control part detects the operation of the operating part by the operation detection signal. Here, the operating part 313 of the vehicle door 311 which is the second door latch device is operated, and the control part 314 detects the operation detection signal from the sensor part (not shown) and transmits a power supply request signal to the control parts 334 and 344 of the first door latch devices 331 and 341 via the control line 304 (step 412).

[0057] Upon receiving the power supply request signal, the control units 334 and 344 of the first door latch device switch from the intermittent power supply that had been provided until then to a continuous power supply by placing the switching units 336 and 346 in a continuously conductive state (steps 434 and 444).

[0058] In the second door latch device 311, the control unit 314 drives the actuator unit 312 using the power supplied from the first door latch devices 331 and 341, and then the series of processes is completed.

[0059] Note that in the first door latch devices 331 and 341, a step can also be provided for determining the amount of power in its own backup power supply unit and judging whether it is possible to supply power to other door latch devices before switching to intermittent power supply in steps 434 and 444. The amount of power can be determined, for example, by measuring the voltage of each backup power supply unit and judging whether the measured voltage has a predetermined voltage value.

[0060] Furthermore, the control unit 314 of the second door latch device 311 can detect that the drive of the actuator unit 312 has ended, and can control the respective control units of the first door latch device to notify the end of drive. In this case, the control unit of the first door latch device receives the drive end notification and can switch the supply of power from the standby power supply unit to an intermittent one.

[0061] In the above example, a case was described in which a user operates vehicle door 311, which is the second door latch device, but the same operation occurs when a user operates vehicle door 321, which is the second door latch device.

[0062] As described above, an in-vehicle communication network using multiplex communication technology can be used for the control line 303 that interconnects the respective control units.

[0063] FIG. 5 is a diagram for explaining the operation of the embodiment of the present invention, showing the operation explained based on FIG. 3 and FIG. 4 in chronological order.

[0064] At time t1, when the intermittent power supply shown in step 433 of Fig. 4 is started, the switching unit is intermittently turned on (on state) (times t1 and t2). In response to this, power is also intermittently supplied to the second door latch device (front door) (times t1 and t2).

[0065] On the other hand, when a user operation is detected at the vehicle door 311 (step 411, time t2), a power supply request signal is output based on that, and the switching unit is controlled to be continuously in a conductive state (ON state) (steps 434 and 444, time t3).

[0066] Next, based on the power supply from the first door latch device, the front door motor is driven with a short delay at time t3.

[0067] Thereafter, upon receipt of an optional drive end notification from the second door latch device (after time t5 has elapsed), the continuous conductive state of the switching ends (time t6). 2, in this embodiment, each second door latch device can be supplied with power from two backup power supplies in the event of a vehicle malfunction. However, because the backup power supplies are provided only in some of the door latch devices of the vehicle doors, the number of backup power supplies can be reduced, which also makes it possible to reduce the weight of the entire vehicle.

[0068] As in the embodiment described based on Fig. 2, in this embodiment, the first door latch device is provided in the rear seat. This reduces the possibility that the backup power source will become unusable in the event of an accident, since the rear seat is relatively less likely to be damaged in an accident. It is also possible to provide the first door latch device in the front seat. It is also possible to configure the vehicle so that backup power sources are provided in the rear seat and the driver's seat of the front seat, or on the passenger side of the rear seat and the front seat.

[0069] In addition, in this embodiment, power is supplied from the first door latch device in response to a power request signal from the second door latch device, thereby reducing unnecessary power consumption by each standby power supply unit.

[0070] In addition, each control unit can be configured to determine whether or not there is sufficient reserve power in its own reserve power supply unit in response to a power request signal and switch the corresponding switching unit, thereby making it possible to suppress inappropriate power consumption.

[0071] In this embodiment, it is assumed that the power supply from the standby power supply units of the first door latch device is substantially simultaneous from a plurality of standby power supply units (steps 434 and 444). However, it is also possible to configure each control unit to sequentially switch the control of each switching unit so that the standby power supply is supplied sequentially. In this case, it is possible to prevent all the standby power supplies from being consumed at once, and it is possible to improve the safety of the vehicle.

[0072] Furthermore, according to this embodiment, the backup mode is entered upon detection of a main power supply failure, but this is not limited to this. It is also possible to control the entry into the backup mode by each control unit receiving a signal from a collision sensor (not shown), by a signal from the collision sensor, or by a combination of the signal from the collision sensor and the state of the main power supply.

[0073] In addition, the first door latch device does not necessarily have to be provided on both seats, and may be provided on only one of the rear seats, for example, and the second door latch device may be provided on the remaining vehicle door, for example, the third seat. By reducing the number of first door latch devices, the weight of the vehicle can be further reduced.

[0074] In addition, in this embodiment, two independent auxiliary power supply lines 304 and 305 are used, so even if an abnormality such as a short circuit or disconnection occurs in one of the auxiliary power supply lines, it is possible to supply power from the other auxiliary power supply line. However, this is not limited to this, and the auxiliary power supply line can also be configured to be commonly connected to a plurality of standby power supply units.

[0075] As described above, the embodiment of the present invention has been described. In addition, the embodiment of the present invention also includes the following forms.

[0076] (1) A vehicle door latch device according to an embodiment of the present invention includes a first door latch device for locking and unlocking a door, a second door latch device for locking and unlocking a door, a main power supply unit for supplying power to the first door latch device and the second door latch device, an actuator unit provided in the first door latch device and a control unit for controlling the actuator unit, an actuator unit provided in the second door latch device and a control unit for controlling the actuator unit, a standby power supply unit provided in the first door latch device for supplying power to the actuator unit of the first vehicle door in the event of a vehicle failure state or a power failure state, an auxiliary power supply line connecting the standby power supply unit provided in the first door latch device and the second latch device, and a control line connecting the control unit provided in the first door latch device and the control unit provided in the latch device of the second vehicle door, wherein the first door latch device is installed on a first vehicle door and the second door latch device is installed on a second vehicle door.

[0077] (2) In the vehicle door latch device, the control unit of the first door latch device supplies power to the second door latch device from the standby power supply unit in a vehicle failure state or a power supply failure state.

[0078] (3) The vehicle door latch device includes a first door latch device having a standby power supply line connecting a control unit and a standby power supply unit, and a switching unit provided between the standby power supply line and the auxiliary power supply line.

[0079] (4) When the control unit of the second door latch device receives an unlock command from an operating unit in a vehicle failure state, the vehicle door latch device sends a signal requesting a supply of power to the control unit of the first door latch device via the control line.

[0080] (5) In the vehicle door latch device, the control unit of the first door latch device that receives the signal controls the switching unit to supply power to the second door latch device.

[0081] (6) The vehicle door latch device is such that the first door latch device is also provided on a third vehicle door, and the first door latch device of the third vehicle door has a standby power line connecting a control unit and a standby power unit, and a switching unit provided between the standby power line and the auxiliary power line.

[0082] (7) The vehicle door latch device according to any one of claims 1 to 6, wherein the second door latch device does not have a standby power supply unit.

[0083] (8) In the vehicle door latch device, the first vehicle door on which the first door latch device is provided is a rear door.

[0084] (9) In the vehicle door latch device, the second vehicle door on which the second door latch device is provided is a driver's door.

[0085] (10) In the vehicle door latch device, the operating portion is an interior or exterior door handle. [Explanation of symbols]

[0086] 100, 200, 300 vehicles 101, 201, 301 Main power supply 102, 202, 302 Power lines 103, 203, 303 Control lines 104, 204, 205, 304, 305 Auxiliary power lines 110, 120, 210, 220, 230, 240, 310, 320, 330, 340 Vehicle Doors 111, 121, 211, 221, 231, 241, 311, 321, 331, 341 Door latch device 112, 122, 212, 222, 232, 242, 312, 322, 332, 342 Actuator section 113, 123, 213, 223, 233, 243, 313, 323, 333, 343 Operation section 114, 124, 214, 224, 234, 244, 314, 324, 334, 344 Control unit 125, 235, 245, 335, 345 Standby power supply unit 336,346 Switching section 337, 347 Auxiliary power lines 338, 348 Switching section control line

Claims

1. a first door latch device for locking and unlocking a door; a second door latch device for locking and unlocking the door; a main power supply unit that supplies power to the first door latch device and the second door latch device; a first actuator unit provided in the first door latch device and a first control unit that controls the first actuator unit; a second actuator unit provided in the second door latch device and a second control unit that controls the second actuator unit; a standby power supply unit provided in the first door latch device for supplying power to the first actuator unit when a vehicle malfunction occurs and power is not supplied from a main power supply; an auxiliary power supply line connecting the standby power supply unit provided in the first door latch device and the second door latch device; a control line connecting the first control unit provided in the first door latch device and the second control unit provided in the second door latch device; the first door latch device is installed on a first vehicle door; The second door latch device is a vehicle door latch device installed on a second vehicle door.

2. 2. The vehicle door latch device according to claim 1, wherein the first control unit of the first door latch device supplies power to the second door latch device from the standby power supply unit in a vehicle failure state.

3. 3. The vehicle door latch device according to claim 1, wherein the first door latch device has a standby power supply line connecting the first control unit and the standby power supply unit, and a switching unit provided between the standby power supply line and the auxiliary power supply line.

4. 4. The vehicle door latch device as described in claim 3, wherein the second control unit of the second door latch device transmits a power supply request signal to the first control unit of the first door latch device via the control line when an unlock command is received from an operating unit in a vehicle failure state.

5. 5. The vehicle door latch device according to claim 4, wherein the first control unit of the first door latch device that receives the power supply request signal controls the switching unit to supply power to the second door latch device.

6. 6. The vehicle door latch device according to claim 1, wherein the first door latch device is also provided on a third vehicle door, and the first door latch device of the third vehicle door has a third control unit, a second standby power supply unit, a second standby power supply line connecting the third control unit and the second standby power supply unit, and a second switching unit provided between the second standby power supply line and the auxiliary power supply line.

7. 7. The vehicle door latch device according to claim 1, wherein the second door latch device does not have a standby power supply unit.

8. 8. The vehicle door latch device according to claim 1, wherein the first vehicle door on which the first door latch device is provided is a rear door.

9. 9. The vehicle door latch device according to claim 1, wherein the second vehicle door on which the second door latch device is provided is a driver's door.

10. 6. The vehicle door latch device according to claim 4, wherein the operation portion is an interior or exterior door handle.

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