JP2000248799A - Operation switch circuit with display function and actuator driver using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation switch circuit with a display function capable of realizing transfer of an operation signal and drive of a display element via a single cable in a simple circuit structure, and an actuator driver using it. SOLUTION: An operation switch circuit 1 with a display function transfers an unlock signal from a change-over switch 11 through a cable 4 to a door lock controller 2 and the door lock controller 2 controls the lighting of an LED 12 for the operation switch circuit 1 with the display function through the same cable 4. A transistor 23 supplies lighting power to the LED 12 and, when the change-over switch 11 falls down to an unlock positioned terminal 112, the LED 12 is lit off by short-circuit and the potential change of the cable 4 is transferred as a potential change at a point (f) to a CPU 24. If the transistor 23 does not supply power to the LED 12, a low-voltage power supply (5V) is applied to the cable 4 for detecting the condition of the unlock positioned terminal 112 of the change-over switch 11 but a constant-voltage diode 13 prevents the lighting of the LED 12 due to the low power voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation switch circuit having a display function, such as an operation switch integrated LED unit, and a vehicle lock device using the same.

[0002]

2. Description of the Related Art An operation side portion of a conventional vehicle door lock control device will be described with reference to a block diagram shown in FIG.
1A is an operation switch integrated LE provided near the driver's seat
The D unit and 2A are door lock controllers for door lock control mounted on the vehicle body apart from the operation switch integrated LED unit.

[0003] LED unit 1A with integrated operation switch
Is composed of a three-point changeover type changeover switch 11A and an LED 12A, and a common terminal of the changeover switch 11A and the LED 12A.
Is grounded. Door lock controller 2A
Has transistors 21A and 23A, a controller A for controlling power supply to a lock terminal and an unlock terminal, a controller C for controlling LED driving, and various resistance elements. These controllers A to C are respectively
Each transistor is individually controlled by a command from A, and the transistors 21A and 23A are connected to the lock position terminal 111, the unlock position terminal 112 and the LED 12A of the changeover switch 11A through the load current limiting resistor rc.
Powered individually through Thereby, the CPU 24A can confirm the operation state of the changeover switch 11A by the potential of the one end of the load current limiting resistor rc on the side opposite to the collector, and the LED 12A controls the CPU 24A through the controller C.
ON / OFF operation of the command.

[0004] In addition to the above-described door lock control device, many actuator drive devices using the operation switch integrated LED unit as described above are mounted on the vehicle.

[0005]

However, in the actuator driving device using the conventional operation switch integrated LED unit as described above, the remote operation switch integrated LED unit 1A and the center side controller 2A are used.
Since the cable 5 for driving the LED and the cables 3 and 4 for transmitting the operation signal of the operation switch are required between
Although reductions have long been desired from the viewpoints of man-hours and weight, they have not been possible without using a complicated signal multiplexing system.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an operation switch circuit with a display function capable of realizing operation signal transmission and display element drive with a single cable with a simple circuit configuration, and an actuator using the same. Its purpose is to realize a drive device.

[0007]

An operation switch circuit having a display function according to the present invention will be described below. The operation circuit section has a constant voltage element in addition to an operation switch for driving the actuator and a display element for displaying an operation state of the actuator. As the constant voltage element, there are various known circuits having a function of conducting at a voltage equal to or higher than the same threshold voltage, in addition to a constant voltage diode usually called a Zener diode or an avalanche diode. For example, an appropriate number of junction diodes and LEDs may be connected in series. Any display element may be used as long as it changes the display state by changing the applied voltage. The constant voltage element and the display element are connected in series and supplied with power through a wiring (cable). The operation switch is connected in parallel to the constant voltage element and the display element.

The other end of the wiring is connected to a display controller for controlling the display of the display element and an operation signal generator for outputting the operation state of the operation switch to the outside as an operation command signal as a voltage signal. The display control unit uses LED
And a high voltage for driving the LED is output to the constant voltage element. The operation signal forming unit includes a load element and a diode connected in series, and applies a voltage lower than that of the display control unit to the operation switch through the wiring. The diode prevents the high voltage of the display control unit from being applied to the load element that returns the operation state of the operation switch to a voltage signal due to the voltage drop.

By employing the above configuration, the following operation can be performed. First, when the operation switch is turned off, the display control unit supplies power to the display element to display it (for example, light up). The operation switch turns on and the display element /
When the constant voltage element is short-circuited, the display element is displayed as “different display (for example, not lit)” from the above. However, this indicates the operation state of the actuator by turning on the operation switch. No problem occurs by associating with another display (for example, non-lighting).

Next, the display controller supplies power to the display element.
Regardless of whether or not the operation switch short-circuits the display element / constant voltage element, a current flows from the display control unit or the operation signal generation unit to the operation switch, and the voltage drop of the load element of the operation signal generation unit decreases. Since it increases, the operation signal forming section can detect the state of the operation switch. The diode is
Since the backflow of the direct current from the display control unit to the operation signal forming unit is prevented when the operation switch is turned off, power consumption can be reduced.

Finally, when the display control unit does not supply power to the display element and the operation switch is turned off, a low voltage is applied to the display element / constant voltage element from the operation signal forming unit. Since the element cuts off the current according to the threshold value, the display element does not erroneously display (for example, light). After all, according to this configuration, the two operations of the operation signal transmission and the display control between the operation switch circuit with the display function and the controller are performed by sharing one wiring without significantly complicating the circuit configuration. Therefore, it is possible to reduce the number of working steps, the weight of the device (especially, the cable), and the number of external terminals.

According to a second aspect of the present invention, in the operation switch circuit with a display function according to the first aspect, since the switch and the display element are formed integrally, the operation circuit portion is formed as a single external terminal as a whole. It is good to have. Similarly, by integrally forming the operation signal forming unit and the display control unit, only one external terminal may be provided on this side. Claim 3
According to the configuration described above, a plurality of operation switch circuits with a display function according to claim 1 or 2 are used. The plurality of operation switch circuits with a display function individually operate a plurality of actuators via a common controller 3.

In this configuration, in particular, the controller operates the plurality of actuators in time sequence in response to the input of a command signal for operating the plurality of actuators. With this configuration, the power supply line does not need to simultaneously supply the starting currents of the plurality of actuators, so that it is possible to improve the safety by reducing the diameter of the power supply line and reducing the fuse capacity.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a preferred embodiment of an actuator driving device using an operation switch circuit with a display function according to the present invention, a vehicle door lock device will be described with reference to the following embodiments.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle door lock device according to this embodiment will be described with reference to the drawings. (Configuration of Child Lock Operation / Display Circuit) FIG. 1 is a circuit diagram showing an operation display portion for controlling and displaying a child lock (rear door lock) of the vehicle door lock device.

Reference numeral 1 denotes an LED unit integrated with an operation switch for child lock control provided in the vicinity of the driver's seat, and 2 denotes a door lock controller for door lock control mounted on the vehicle body apart from the LED unit 1 integrated with the operation switch. is there. The operation switch integrated type LED unit 1 is a three-point switching type changeover switch (operation switch in the present invention) 1
1, LED 12, constant voltage diode 13, and resistance element 1
4 and are integrally formed. The LED 12, the constant voltage diode 13 and the resistance element 14 are connected in series, and one end of the constant voltage diode 13 is grounded.
Note that the resistance element 14 is for limiting a conduction current,
This is not essential when the current is sufficiently limited by other elements of the LED 12. The common terminal 110 of the changeover switch 11 is grounded, the lock position terminal 111 is connected to one end of the cable 3, and the unlock position terminal 112 and one end of the LED 12 are connected to one end of the cable 4.

The door lock controller 2 includes transistors 21 and 23, a lock terminal power supply control controller A, an LED drive control controller C, a resistance element (load element in the present invention) R, a backflow prevention diode D,
It comprises a CPU 24 and various resistance elements for limiting current, which will be described later. The transistor 21 is supplied with power from the battery and supplies the power to the lock position terminal 111 of the changeover switch 11 through the current limiting resistance element rc1 on the collector side.
, And is controlled by the lock control signal voltage applied to the base of the transistor 21 through the base current limiting resistor rb1. The potential of the lock position terminal 111, that is, the open / close state of the lock position terminal 111 is read by the CPU 24 through the resistance element rs1.

The transistor 23 is supplied with power from a battery (not shown), and has a collector current limiting resistor r.
Power is supplied to the unlock position terminal 112 of the changeover switch 11 and the LED 12 through the cable c2 and the cable 3. The control power supply (5 V) also supplies power to the unlock position terminal 112 of the changeover switch 11 and the LED 12 through the resistance element (load element in the present invention) R, the diode D, and the cable 4. The anode potential of the diode D, that is, the open / close state of the unlock position terminal 112 is read by the CPU 24 through the resistance element rs2.

The transistor 23, the controller C, and the resistance elements rc1 and rb2 constitute a display control unit according to the present invention, and the resistance elements R, rs2 and the diode D constitute an operation signal forming unit according to the present invention. The operation of the operation switch integrated LED unit 1 will be described below. (Overall Configuration of Vehicle Door Lock Device) FIG. 2 is a block diagram showing the entire vehicle door lock device.

Reference numeral 5 denotes an operation switch-integrated LED unit for door lock control and status display having the same configuration as the child lock control-operation switch-integrated LED unit.
Reference numeral 6 denotes an ignition switch, 7 denotes an airbag controller for controlling the operation of an airbag (not shown), 8 denotes an actuator for door lock, 9 denotes an actuator for child lock, and 10 denotes a switch. The door lock actuator 8 locks and unlocks all the doors of the vehicle, the child lock actuator 9 locks and unlocks the rear door of the vehicle, and the switch 10 locks the child lock actuator 9. Or unlocked state and the corresponding signal
Output to U24. (Operation of Child Lock Operation / Display Circuit) By employing the above configuration, the following operation can be performed.

Lock issuing operation The CPU 24 turns on the transistor 21 through the controller A when the ignition switch 6 is turned on, whereby the CPU 24 determines whether or not the changeover switch 11 has been operated to the lock position terminal 111 side or not. Reading is performed by detecting a voltage drop amount of the resistance element rc1 through rs1. The changeover switch 11 is the lock position terminal 11
If it is determined that the operation has been performed to the first side (in the case of reading the low level potential), the child lock actuator 9 is used.
Then, the locking operation of the rear door is started, whereby the limit switch 10 detects the locking operation and detects the locked and unlocked state (child lock) of the rear door.

In this embodiment, the LED 12 is turned on when it is read from the switch 10 that the child lock actuator 9 is performing a lock operation.
D12 is turned off. However, if the ignition switch 6 is not turned on to save power, this lighting is limited to 5 seconds. That is, when reading the locking operation of the actuator 10 from the switch 10, the CPU 24 lights the LED 12 for 5 seconds irrespective of the state of the ignition switch 6, and thereafter keeps lighting only while the ignition switch 6 is on.

Issuance of unlock operation First, an unlock operation issuance when the transistor 23 is turned on will be described below. In this case, the changeover switch 1
1 is operated to the unlock position terminal 112 side, the potential drop of the cable 4 occurs. This potential drop is read into the CPU 24 through the diode D and the resistance element rs2, and the read unlock command signal causes the child lock device to operate. 9 is unlocked. Also, the LED 12 is turned off by the ground short-circuit operation by the changeover switch 11. This unlock operation of the child lock actuator 9 is detected by the switch 10 and the CPU 24
The CPU 24 shuts off the transistor 23 through the controller C, and cuts off the power supply to the LED 12 from the battery having a high voltage through the transistor 23. However, the control power supply voltage (+5 V) causes a current to flow through the resistance element R, the diode D, and the changeover switch 11. To reduce this current, the resistance value of the resistance element R may be set to a large value.

Next, an unlock operation issuance when the transistor 23 is turned off will be described below. Immediately before this, since the control power supply voltage (+ 5V) is applied to the unlock position terminal 112 of the changeover switch 11 through the resistance element R and the diode D, when the changeover switch 11 is turned to the unlock position terminal 112 side, the diode The potential of the anode electrode of D drops, and the CPU 24 reads this potential drop through the resistance element rs2 and recognizes the unlock command from the changeover switch 11.

Prevention of erroneous lighting of LED 12 by control power supply Next, the LED 12 when the transistor 23 is off (when the unlock state is displayed by the CPU 24) and the changeover switch 11 is not tilted to the unlock position terminal 112
Will be described. In this case, the control power supply voltage (5 V) is set smaller than the sum of the threshold voltage of the constant voltage diode 13, the forward threshold voltage of the diode D, and the forward threshold voltage of the LED 12. The LED 12 is not energized, and the LED 12 is not erroneously turned on (locked state display) due to the control power supply voltage (5 V). (Explanation of Operation of Door Lock Controller 2) FIG.
The description will be made again with reference to the flowchart shown in FIG.

First, the transistor A is supplied to the controller A.
Is turned on (step 100), and then the state of the ignition switch 6, the airbag controller 7, the changeover switch 11, the actuators 8, 9 and the switch 10 is read (step 102). A turns off the transistor 21 (step 104), and resets a lock flag described later to 0 (step 106).

Next, it is determined whether or not the read d-point potential is at a low level (step 108). If so, the changeover switch 11 is determined to be tilted toward the lock position terminal 111, and the actuator 9 is driven to lock (step 108). Step 1
10), a lock flag indicating the locked state is set (step 112), and the process proceeds to step 118. Step 10
If the potential at the point d is high in step 8, it is determined whether the potential at the point f is low (step 114). If so, the changeover switch 11 is determined to be tilted toward the unlock position terminal 112 and the actuator 9 Is unlocked (step 116), and the process proceeds to step 118.

In step 118, it is determined whether or not the state of the switch 10 is locked. If not, the process proceeds to step 136 because the unlocked state is established, and the LED 12 is turned off. If so, the state of the ignition switch 6 is changed. If it is determined that the ignition switch 6 is on, the routine proceeds to step 122, where the LED 12 is turned on. If the ignition switch is off at step 120, it is checked whether the lock flag is 1 (step 124).
If it is, the changeover switch 11 is instructing to lock, so the LED 12 is turned off (step 136). If it is 0, the changeover switch 11 is instructing to unlock, so the LED is turned off.
12 is turned on (step 126).

Next, it is checked whether or not the 5-second timer is counting (step 128).
Start it at 0, otherwise directly
Proceeding to step 132, if the 5-second timer has not reached 5 seconds, return to S100; otherwise, go to step 1
Stop the 5-second timer at 34, clear it, and then
2 is turned off (step 136).

The state of each part by this control operation will be described with reference to the flowchart shown in FIG. (Prevention of Fusing of Fuse 20) Next, a control operation for preventing the fusing of the fuse 20 shown in FIG. 2 will be described with reference to a flowchart shown in FIG. This routine is an interrupt routine and is executed at a predetermined interval.

When the airbag controller 7 instructs the inflation of the airbag, the door lock controller 2 reads it in step 102 and holds it. Next, FIG.
Is executed, first, the airbag controller 7 determines whether or not the airbag controller 7 has instructed the inflation of the airbag, that is, whether or not a collision has been detected (step 200). Returning to the main routine shown, if detected, the door lock actuator 8 is operated to the unlock side (step 202), and after waiting for a predetermined time ΔT (here, 2 seconds) (step 204), the child lock actuator is operated. 9
Is operated to the unlock side (step 206).

In this way, since the actuators 8 and 9 are not simultaneously activated even when a collision is detected, it is necessary to set the fuse (or overcurrent relay) so as to withstand a large activation current in the simultaneous activation. Instead, the fuse (or overcurrent relay) can be set to operate with a smaller current, and a large current that is smaller than the above-mentioned two starting currents but exceeds the allowable value flows to either of the actuators 8 and 9. Can be prevented, and safety can be improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an operation display portion for child lock control and status display of the vehicle door lock device.

FIG. 2 is a block diagram showing the entire vehicle door lock device.

FIG. 3 is a flowchart showing the operation of the circuit of FIG. 1;

FIG. 4 is a timing chart showing the operation of the circuit of FIG.

FIG. 5 is a flowchart illustrating another operation of the circuit in FIG. 2;

FIG. 6 is a circuit diagram showing an operation display portion of a conventional vehicle door lock device.

[Explanation of symbols]

1 is an operation switch integrated LE for child lock control
D unit (operation circuit unit), 2 is a door lock controller for door lock control, 4 is a cable (wiring), 9 is an actuator, 11 is a changeover switch (operation switch),
12 is an LED (display element), 13 is a constant voltage diode,
23 is a transistor (display control unit), C is a controller (display control unit), R is a resistance element (load element, operation signal forming unit), and D is a diode (operation signal forming unit).

Claims (3)

[Claims] 1. A display element for displaying a state of an actuator, a constant voltage element connected in series with the display element, and
An operation circuit having an operation switch connected in parallel to the display element and the constant voltage element to output an operation command signal to the actuator, one end being connected to a common lower power supply end and the other end being connected to one end of a wiring A display control unit interposed between a high-voltage power supply terminal having a predetermined potential and the other end of the wiring, and controlling display of the display element by switching between power supply to the display element and power supply cutoff; A backflow preventing diode having an end connected to the other end of the wiring, and a diode having a predetermined resistance value between an anode end of the diode and a medium voltage power supply terminal having a lower potential than the high voltage power supply terminal. And an operation signal forming unit that outputs a potential of a connection point between the diode and the load element as the operation command signal of the operation switch to the actuator side. Voltage The operation switch circuit with a display function, wherein the element has a threshold value for interrupting power supply from the operation signal forming unit when the power supply from the display control unit to the display element is interrupted. 2. The operation switch circuit with a display function according to claim 1, wherein the switch and the display element are formed integrally. 3. A controller for individually controlling a plurality of actuators in accordance with the command signals respectively input from the plurality of operation switch circuits with a display function, wherein the controller operates the plurality of actuators. 3. The actuator driving device using an operation switch circuit with a display function according to claim 1 or 2, wherein the plurality of actuators are operated in time sequence in response to the input of the command signal.