JP4196468B2 - Operation switch circuit with display function and actuator drive device using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an operation switch circuit with a display function, such as an operation switch integrated LED unit, and a vehicle locking device using the same.
[0002]
[Prior 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 LED unit provided near the driver's seat, and 2A is a door lock controller for door lock control which is mounted on the vehicle body away from the operation switch integrated LED unit.
[0003]
The operation switch integrated LED unit 1A includes a three-point changeover type changeover switch 11A and an LED 12A, and a common terminal of the changeover switch 11A and one end of the LED 12A are grounded. The door lock controller 2A includes transistors 21A and 23A, a controller A for power supply control to the lock terminal and the unlock terminal, a controller C for LED drive control, and various resistance elements. These controllers A to C individually control each transistor according to a command from the CPU 24A, 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. Power is supplied individually through 3-5. Thereby, the CPU 24A can confirm the operation state of the changeover switch 11A by the potential of one end of the load current limiting resistor rc on the opposite side of the collector, and the LED 12A performs on / off operation according to the command of the CPU 24A through the controller C. .
[0004]
In addition to the door lock control device described above, many actuator drive devices using the operation switch integrated LED unit as described above are mounted on the vehicle.
[0005]
[Problems to be solved by the invention]
However, in the actuator driving apparatus using the conventional operation switch integrated LED unit as described above, the LED driving cable 5 and the operation are connected between the remote operation switch integrated LED unit 1A and the central controller 2A. Since the switch operation signal transmission cables 3 and 4 are necessary, reduction of the operation time and weight has long been desired, but this can be realized without using a complicated signal multiplexing system. I could n’t.
[0006]
The present invention has been made in view of the above-described problems, and provides an operation switch circuit with a display function capable of realizing operation signal transmission and display element driving with a simple circuit configuration with a single cable, and an actuator driving device using the same. Its purpose is to realize.
[0007]
[Means for Solving the Problems]
The operation switch circuit with a display function according to the first aspect of 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 the operation state of the actuator. As the constant voltage element, usually another constant voltage diode called a Zener diode and A balun cerevisiae diodes, there are various known circuit having a function of conducting at the same threshold voltage or more. For example, an appropriate number of junction diodes or LEDs may be connected in series. Any display element may be used as long as the display state is changed 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.
[0008]
The other end of the wiring is connected to a display control unit that controls display of the display element and an operation signal forming unit that outputs an operation state of the operation switch to the outside as an operation command signal as a voltage signal. The display control unit outputs a high voltage for driving the LED to the LED and the constant voltage element through the wiring. 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 is for preventing the high voltage on the display control unit side from being applied to the load element side that returns the operation state of the operation switch to the voltage signal due to the voltage drop.
[0009]
By adopting the above configuration, the following operations can be performed.
First, when the operation switch is turned off, the display control unit supplies power to the display element to display (for example, turn on) it. When the operation switch is turned on and the display element / constant voltage element is short-circuited, the display element becomes “another display (for example, non-lighting)”. By causing the operation state to correspond to “another display (for example, non-lighting)” of the display element, no trouble occurs.
[0010]
Next, when the operation switch short-circuits the display element / constant voltage element regardless of whether the display control unit supplies power to the display element, current flows from the display control unit or the operation signal forming unit to the operation switch. As a result, the voltage drop across the load element of the operation signal forming unit increases, so that the operation signal forming unit can detect the state of the operation switch.
Since the diode prevents a backflow of a direct current from the display control unit to the operation signal forming unit when the operation switch is turned off, power consumption can be reduced.
[0011]
Finally, when the display control unit is not supplying power to the display element and the operation switch is turned off, a low voltage is applied from the operation signal forming unit to the display element / constant voltage element. Since the current is cut off by the threshold value, the display element does not cause the above display (for example, lighting) by mistake.
In the end, according to this configuration, two operations of operation signal transmission and display control between the operation switch circuit with a display function and the controller are performed by sharing one wiring without complicating the circuit configuration so much. It is possible to reduce the number of work steps, the weight of the device (particularly the cable), and the number of external terminals.
[0012]
According to the configuration of the second aspect, in the operation switch circuit with a display function according to the first aspect, since the switch and the display element are integrally formed, the operation circuit unit has one external terminal as a whole. That's fine. Similarly, by forming the operation signal forming unit and the display control unit integrally, only one external terminal is required on this side.
According to the configuration described in claim 3, 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.
[0013]
In this particular configuration, the controller, to the input of the command signal for operating the plurality of actuators to actuate a plurality of actuators order below.
In this way, since it is not necessary for the power supply line to supply the starting currents of a plurality of actuators at the same time, it is possible to improve safety by reducing the diameter of the power supply line and reducing the fuse capacity.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
A vehicle door lock device will be described with reference to the following embodiments as a preferred mode of an actuator driving device using an operation switch circuit with a display function of the present invention.
[0015]
【Example】
The vehicle door lock device of this embodiment will be described with reference to the drawings.
(Child lock operation / display circuit configuration)
FIG. 1 is a circuit diagram showing an operation display portion for child lock (rear door lock) control and status display of the vehicle door lock device.
[0016]
1 is an operation switch integrated LED unit for child lock control provided near the driver's seat, and 2 is a door lock controller for door lock control mounted on the vehicle body away from the operation switch integrated LED unit 1.
The operation switch integrated LED unit 1 includes a three-point switching type switch (operation switch in the present invention) 11, an LED 12, a constant voltage diode 13, and a resistance element 14, and is 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 energizing current limitation, but is not essential when sufficient current limitation is performed by other elements of the LED 12. The common terminal 110 of the changeover switch 11 is grounded, its lock position terminal 111 is connected to one end of the cable 3, its unlock position terminal 112 and one end of the LED 12 are connected to one end of the cable 4.
[0017]
The door lock controller 2 includes transistors 21 and 23, a controller A for power supply control of a lock terminal, a controller C for LED drive control, a resistance element (load element in the present invention) R, a diode D for backflow prevention, a CPU 24 and a later-described. It consists of various current limiting resistors.
The transistor 21 is supplied with power from the battery, and supplies power to the lock position terminal 111 of the changeover switch 11 through the current limiting resistor rc1 on the collector side thereof. This power supply is used for limiting the base current by the controller A that transmits a command of the CPU 24. It is controlled by a lock control signal voltage applied to the base of the transistor 21 through the resistor rb1. The potential of the lock position terminal 111, that is, the open / closed state of the lock position terminal 111 is read into the CPU 24 through the resistance element rs1.
[0018]
The transistor 23 is supplied with power from a battery (not shown) and supplies power to the unlock position terminal 112 of the changeover switch 11 and the LED 12 through the collector-side current limiting resistor rc2 and the cable 3. The control power supply (5 V) also feeds power to the unlock position terminal 112 and the LED 12 of the changeover switch 11 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 / closed state of the unlock position terminal 112 is read into the CPU 24 through the resistance element rs2.
[0019]
The transistor 23, the controller C, and the resistance elements rc1 and rb2 constitute a display control section referred to in the present invention, and the resistance elements R, rs2 and the diode D constitute an operation signal forming section referred to in 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.
[0020]
Reference numeral 5 denotes a door lock control / state display integrated LED unit having the same configuration as the child lock control integrated LED switch unit, 6 denotes an ignition switch, and 7 denotes an air bag for controlling the operation of an air bag (not shown). A bag controller, 8 is a door lock actuator, 9 is a child lock actuator, and 10 is a switch. The door lock actuator 8 locks and unlocks the doors of the entire 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 the unlocked state is detected and a corresponding signal is output to the CPU 24.
(Child lock operation / display circuit operation)
By adopting the above configuration, the following operations can be performed.
[0021]
The lock issuing operation 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 the changeover switch 11 is operated to the lock position terminal 111 side or not through the resistance element rs1. Reading is performed by detecting a voltage drop amount of the resistance element rc1. When it is determined that the changeover switch 11 has been operated to the lock position terminal 111 side (in the case of low level potential reading), the child lock actuator 9 is started to lock the rear door, whereby the limit switch 10 is locked. Is detected to detect whether the rear door is locked or unlocked (child lock).
[0022]
Display control of the LED 12 In this embodiment, the LED 12 is turned on when the child lock actuator 9 is read from the switch 10 and the LED 12 is turned off otherwise. However, if the ignition switch 6 is not turned on to save power, this lighting is limited to 5 seconds. That is, when the CPU 24 reads the lock operation of the actuator 10 from the switch 10, the LED 12 is lit for 5 seconds regardless of the state of the ignition switch 6, and thereafter, lighting is continued only while the ignition switch 6 is on.
[0023]
First, the unlock operation issuance when the transistor 23 is on will be described.
In this case, when the changeover switch 11 is operated to the unlock position terminal 112 side, the potential drop of the cable 4 occurs, and this potential drop is read into the CPU 24 through the diode D and the resistance element rs2, and this read unlock is performed. The child lock device 9 is unlocked by the command signal. Further, the LED 12 is turned off by the ground short circuit operation by the changeover switch 11. This unlocking operation of the child-locking actuator 9 is detected by the switch 10 and read into the CPU 24. The CPU 24 shuts off the transistor 23 through the controller C, and supplies power to the LED 12 from the battery having a high voltage through the transistor 23. Blocked. However, the control power supply voltage (+5 V) passes a current through the resistance element R, the diode D, and the changeover switch 11. In order to reduce this current, the resistance value of the resistance element R may be set large.
[0024]
Next, the unlock operation issuance when the transistor 23 is off will be described below.
Immediately before this, the control power supply voltage (+5 V) is applied to the unlock position terminal 112 of the changeover switch 11 through the resistance element R and the diode D. Therefore, when the changeover switch 11 is tilted to the unlock position terminal 112 side, the diode The anode electrode potential of D decreases, and the CPU 24 reads this potential decrease through the resistance element rs2, and recognizes the unlock command from the changeover switch 11.
[0025]
Prevention of erroneous lighting of the LED 12 by the control power supply Next, the prevention of erroneous lighting of 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. To do.
In this case, since the control power supply voltage (5V) 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 (lock state display) by the control power supply voltage (5 V).
(Description of the operation of the door lock controller 2)
The operation described above will be described again from the viewpoint of the operation of the door lock controller 2 with reference to the flowchart shown in FIG.
[0026]
First, the transistor A is turned on by the controller A (step 100), and then the states of the ignition switch 6, the air bag controller 7, the changeover switch 11, the actuators 8, 9 and the switch 10 are read (step 102) and wait for a predetermined time. Thereafter, to save power, the controller A turns off the transistor 21 (step 104), and resets a lock flag described later to 0 (step 106).
[0027]
Next, it is determined whether or not the read d-point potential is at a low level (step 108). If so, it is assumed that the changeover switch 11 has fallen to the lock position terminal 111 side, and the actuator 9 is driven to lock (step 110). Then, a lock flag indicating the lock state is set (step 112), and the process proceeds to step 118. If the d-point potential is at the high level in step 108, it is determined whether the f-point potential is at the low level (step 114). If so, it is assumed that the changeover switch 11 has fallen to the unlock position terminal 112 side. 9 is unlocked (step 116), and the process proceeds to step 118.
[0028]
In step 118, it is determined whether or not the switch 10 is in the locked state. Otherwise, since it is in the unlocked state, the process proceeds to step 136 and the LED 12 is turned off. If so, the state of the ignition switch 6 is determined. If the ignition switch 6 is on, the routine proceeds to step 122 where the LED 12 is lit. If the ignition switch is off in step 120, it is checked whether the lock flag is 1 (step 124). If it is 1, the changeover switch 11 has commanded the lock, so the LED 12 is turned off (step 136). If so, since the changeover switch 11 has commanded unlocking, the LED 12 is turned on (step 126).
[0029]
Next, it is checked whether the 5-second timer is counting (step 128). If not, it is started in step 130, and if not, the process proceeds directly to step 132, and the 5-second timer is set to 5 seconds. If not reached, the process returns to S100, and if reached, the timer is stopped for 5 seconds in step 134 and cleared, and then the LED 12 is turned off (step 136).
[0030]
The state of each part by this control operation will be described with reference to the flowchart shown in FIG.
(Prevents fusing of fuse 20)
Next, a control operation for preventing 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.
[0031]
When the airbag controller 7 commands the inflation of the airbag, the door lock controller 2 reads it in step 102 and holds it.
Next, when the interrupt routine shown in FIG. 5 is executed, it is first determined whether or not the airbag controller 7 has commanded the airbag to be inflated, that is, whether or not a collision has been detected (step 200). If not, the process returns to the main routine shown in FIG. 3, and if detected, the door locking actuator 8 is actuated to the unlock side (step 202), and after waiting for a predetermined time ΔT (here 2 seconds) (step 204), The child lock actuator 9 is operated to the unlock side (step 206).
[0032]
In this way, even when a collision is detected, the actuators 8 and 9 do not start at the same time, so there is no need to set a fuse (or overcurrent relay) to withstand a large starting current in both simultaneous startings. The fuse (or overcurrent relay) can be set to operate with a smaller current, preventing the actuator 8 or 9 from flowing a large current that is smaller than the above two starting currents but exceeds the allowable value. Can improve safety.
[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.
4 is a timing chart showing the operation of the circuit of FIG.
FIG. 5 is a flowchart showing another operation of the circuit of 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 LED unit (operation circuit unit) integrated with an operation switch for child lock control, 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), Reference numeral 12 denotes an LED (display element), 13 denotes a constant voltage diode, 23 denotes a transistor (display control unit), C denotes a controller (display control unit), R denotes a resistance element (load element, operation signal forming unit), and D denotes a diode ( Operation signal forming part)

Claims (3)

Display device for displaying an operating state of the actuator (12), wherein the display device (12) and connected in series constant voltage element (13), and, parallel to the display element (12) and the constant voltage element (13) An operation circuit unit ( 11) having an operation switch (11) connected to output an operation command signal to the actuator (9) , one end connected to the common low power supply end and the other end connected to one end of the wiring (4) 1) and
The display of the display element (12) is controlled by switching between power supply to the display element (12) and power supply interruption, which is interposed between a high voltage power supply terminal having a predetermined potential and the other end of the wiring (4). A display controller (23, C ) ;
A back-flow preventing diode ( D ) having a cathode end connected to the other end of the wiring (4) , and having a predetermined resistance value, than the anode end of the diode ( D ) and the high-voltage power supply end has a load element which is interposed between the voltage supply terminal in the low potential (R), the potential the operation switch of the diode (D) and said load element (R) and the connection point (f) ( 11) an operation signal forming section (R, rs2, D,) that outputs to the actuator side as the operation command signal;
With
The constant voltage element (13) cuts off the power supply from the operation signal forming unit ( R , rs2, D ,) when the power supply is cut off from the display control unit (23, C ) to the display element (12) . An operation switch circuit with a display function, characterized in that it has a threshold value. In the operation switch circuit with a display function according to claim 1,
An operation switch circuit with a display function, wherein the switch and the display element are integrally formed. A controller for individually controlling the plurality of actuators according to the command signals respectively input from the plurality of operation switch circuits with a display function; and the controller includes the command signals for operating the plurality of actuators. input to the plurality of actuators actuator driving apparatus using the display function operation switch circuit according to claim 1 or 2, wherein the forward to then actuate the.

Images