JPH0540558U - Vehicle door lock control device - Google Patents

Abstract

(57) [Summary] [Purpose] The dark current is reduced to prevent the battery from running down. A door lock state information is transmitted to a control module 1 through a signal transmission line, and door lock locking instruction information is received from the control module to control door lock locking via a door lock motor 5. The communication circuit 2 is provided, and one end of the door lock detection switch 6 for outputting to the communication circuit the door lock state information that is off when the door lock is in the locked state and is on when the door lock is in the unlocked state is grounded. In addition, the other end of the door lock detection switch is connected to the first pull-up resistor 12
And a second pull-up resistor 13 connected in series to the power supply circuit 9 via a sleep signal output from the communication circuit in synchronization with the on / off of the ignition switch. It is connected in parallel to the first pull-up resistor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle door lock control device for controlling locking of a door lock via a vehicle door lock motor.

[0002]

[Prior Art]

 As a conventional vehicle door lock control device, there is, for example, one shown in FIG. In the figure, reference numeral 1 is a control module which is a master station for multiplex communication. The control module 1 receives door lock status information via signal transmission lines A and B, and at the same time, door lock locking instruction information from the control module 1. To send. Reference numeral 2 is a communication circuit which is a slave station of multiplex communication that operates based on a signal for a local area network (hereinafter abbreviated as a signal for LAN) that has passed through a communication interface 3. Reference numeral 4 is a motor driver driven by an output from the communication circuit 2. 5 is a door lock motor operated by the motor driver 4, 6 is a door lock detection switch that is turned off when the door lock is locked and is turned on when the door lock is unlocked. One end of 6 is grounded, and the other end is connected to a power supply circuit 9 driven by an in-vehicle battery 8 via a pull-up resistor 7. Reference numeral 10 is an input protection resistor, and 11 is a clock generation circuit.

Next, the operation will be described. A door lock detection signal indicating the door lock state information from the door lock detection switch 6 is transmitted to the communication circuit 2. This door lock state information is transmitted to the control module 1 via the signal transmission lines A and B. When the communication circuit 2 receives the door lock locking instruction information from the control module 1, the motor driver 4 drives the door lock motor 5 to control the locking of the door lock.

[0004]

[Problems to be solved by the device]

 However, in such a conventional vehicle door lock control device, when the engine is stopped and the vehicle is left for a long time without being locked, the dark current is kept flowing through the pull-up resistor 7. Therefore, since the dark current flows as much as the normal operating current, there is a problem that the so-called battery exhaustion easily occurs.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a vehicle door lock control device that reduces a dark current to prevent the battery from running down. .

[0006]

[Means for Solving the Problems]

 A vehicle door lock control device according to the present invention transmits door lock state information to another communication circuit via a signal transmission line and receives door lock locking instruction information from the other communication circuit to receive a door lock. It is equipped with a communication circuit that controls the locking of the door lock via a motor.Ground one end of the door lock detection switch that turns off when the door lock is in the locked state and turns on when the door lock is in the unlocked state. , The other end of this door lock detection switch is connected to the power supply circuit via the first pull-up resistor, and the sleep signal output from the above communication circuit turns it on in synchronization with the on / off of the ignition switch. A series circuit of a switch element that is driven off and a second pull-up resistor is connected in parallel with the first pull-up resistor, and a door lock state information indicating the door lock state information is displayed. A lock detection signal Ru der those to output to the communication circuit.

[0007]

[Action]

 The vehicle door lock control device in this invention outputs a door lock detection signal indicating door lock state information from a door lock detection switch which is turned off when the door lock is in the locked state and turned on when the door lock is in the unlocked state. In addition to outputting to the communication circuit, the dark current is reduced by reducing the current flowing through the door lock detection switch when the ignition is off and the door lock is on.

[0008]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, the same or equivalent components as in FIG. First, the configuration will be described. In the figure, 12 is a first pull-up resistor, 13 is a second pull-up resistor whose resistance value is set smaller than that of the first pull-up resistor 12, and this second pull-up resistor is used. The up resistor 13 is controlled by the first and second transistors 14 and 15. Reference numeral 16 is a Schmitt NAND circuit, and the Schmitt NAND circuit 16 is driven on / off in synchronization with the on / off of the ignition switch by a sleep signal output from the communication circuit 2.

Next, the operation will be described. When the ignition switch is turned on, the sleep signal is output from the communication circuit 2 so that the first and second transistors 14 and 15 are turned on. Then, when the door lock detection switch 6 is turned on, a current from the second pull-up resistor 13 and a current from the first pull-up resistor 12 flow.

Further, by turning off the second transistor 15 when the ignition switch is off, only the current from the first pull-up resistor 12 flows when the door lock detection switch 6 is on. Thus, when the ignition switch is turned on, a sufficient current flows through the first pull-up resistor 12 and the second pull-up resistor 13 in the door lock detection switch 6, and when the ignition switch is turned off, the door lock detection switch 6 A necessary minimum current flows through the first pull-up resistor 12.

Then, a door lock detection signal indicating the door lock state information from the door lock detection switch 6 is transmitted to the communication circuit 2, and this door lock state information is further transmitted to the control module 1 via the signal transmission lines A and B. Sent. Further, when the communication circuit 2 receives the door lock locking instruction information from the control module 1, the motor driver 4 drives the door lock motor 5 to control the locking of the door lock.

[0012]

[Effect of the device]

 As described above, according to the present invention, the configuration transmits the door lock status information to another communication circuit via the signal transmission line and receives the door lock locking instruction information from the other communication circuit. It is equipped with a communication circuit that controls the locking of the door lock via the door lock motor, and is turned off when the door lock is in the locked state, and is turned on when the door lock is in the unlocked state. In addition to grounding, connect the other end of this door lock detection switch to the power supply circuit via the first pull-up resistor, and synchronize with the on / off of the ignition switch by the sleep signal output from the above communication circuit. A series circuit of a second pull-up resistor and a switch element that is turned on and off by parallel connection is connected in parallel to the first pull-up resistor, and the above-mentioned door lock detection is performed. The door lock control device for a vehicle is characterized in that the door lock detection signal indicating the door lock state information from the other end of the switch is output to the communication circuit, so that the dark current is reduced, so that the battery is discharged. The effect of being able to prevent is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a vehicle door lock control device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a conventional vehicle door lock control device.

[Explanation of symbols]

 2 communication circuit 5 door lock motor 6 door lock detection switch 9 power supply circuit 12 first pull-up resistor 13 second pull-up resistor 14 first transistor 15 second transistor 16 Schmidt NAND circuit

Claims (1)

[Scope of utility model registration request] 1. A door lock state information is transmitted to another communication circuit 2 through a signal transmission line, and door lock locking instruction information is received from this other communication circuit to receive a door lock motor 5. In a vehicle door lock control device having a communication circuit for controlling lock / lock, a door lock indicating door lock state information that is turned off when the door lock is in a locked state and turned on when the door lock is in an unlocked state One end of the door lock detection switch 6 that outputs a detection signal to the communication circuit is grounded, and the other end of the door lock detection switch is connected to the power supply circuit 9 via the first pull-up resistor 12, and the communication is further performed. A switch element 14, which is driven on / off in synchronization with on / off of an ignition switch by a sleep signal output from a circuit,
A vehicle door lock control device, wherein a series circuit of 15, 16 and a second pull-up resistor 13 is connected in parallel to the first pull-up resistor.