JP2002274330A - Wiper control device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper control device for a vehicle capable of continuously and intermittently operating a wiper by a simple operation without newly attaching a switch to the vehicle. SOLUTION: This wiper control device 10 for the vehicle is installed between a wiper motor 16 and a wiper switch 11 mounted on the vehicle and continuously or intermittently operating the wiper. This control device is provided with a control means 14 continuously operating the wiper when a wiper-on signal is transmitted once from the wiper switch 11 in a prescribed time and switching to an intermittent operation of the wiper when the signal is transmitted twice, and an electronic switch 15 applying a power voltage to the wiper motor 16 when a continuous/intermittent signal is transmitted from the control means 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a vehicle wiper for continuously or intermittently operating a wiper.

[0002]

2. Description of the Related Art Generally, vehicles such as passenger cars and wagons are equipped with a wiper to remove rainwater, ice and snow adhering to a windshield during rainfall or snowfall. Further, depending on the type of vehicle, a rear wiper is mounted to wipe off water droplets and hoisting droplets attached to the rear window.

[0003] Such a wiper can usually select a continuous operation or an intermittent operation. When the rainfall is small, the wiper is operated intermittently, and when the rainfall is large, the wiper is operated continuously. Thus, a suitable wiper operation according to the weather can be performed.

[0004]

However, with respect to the rear wiper, most vehicles do not have an intermittent operation function.
Some vehicles have only one of the intermittent operation and continuous operation functions.

Therefore, for example, in the case of a vehicle type in which the front wiper or the rear wiper has a function of continuous operation only, when the amount of water droplets adhering to the windshield or the rear window is small, the driver appropriately turns on the wiper switch. At present, an operation of removing water droplets by performing an OFF operation is performed. Such operations are troublesome, and there is a problem that operability is deteriorated because the user cannot concentrate on driving.
Therefore, there has been an increasing demand for a wiper that can be installed later and has a function of continuous operation and intermittent operation.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object the continuous operation of the wiper by a simple operation without installing a new switch on the vehicle. An object of the present invention is to provide a control device for a vehicle wiper capable of obtaining an intermittent operation.

[0007]

In order to achieve the above object, a control apparatus for a vehicle wiper according to the present invention is provided between a wiper motor mounted on a vehicle and a wiper switch to continuously connect the wiper. Alternatively, the control device is a control device for a vehicle wiper that performs an intermittent operation, wherein the wiper is continuously operated when a wiper-on signal is transmitted once from a wiper switch within a predetermined time, and the wiper is switched to perform an intermittent operation when transmitted twice. Control means, and continuous /
And an electronic switch for applying a power supply voltage to the wiper motor when the intermittent operation signal is transmitted.

Further, the present invention is a control device for a vehicle wiper which is installed between a wiper motor mounted on a vehicle and a wiper switch and operates the wiper continuously or intermittently. A first time constant circuit, and a wiper switch is continuously operated when a wiper-on signal is transmitted once from a wiper switch within a time set by the first time constant circuit, and the wiper is intermittently operated when transmitted twice. Control means including first and second logic circuits for switching to perform the operation, and second and third time constant circuits for setting a wiper stop time and a wiper driving time when the wiper intermittently operates; An electronic switch for applying a power supply voltage to the wiper motor when a continuous / intermittent operation signal is transmitted from the means. Further, the first and second logic circuits are constituted by D flip-flops.

Further, the present invention is a control apparatus for a vehicle wiper which is installed between a wiper motor mounted on a vehicle and a wiper switch and operates the wiper continuously or intermittently. A first time constant circuit, and a wiper switch is continuously operated when a wiper-on signal is transmitted once from a wiper switch within a time set by the first time constant circuit, and the wiper is intermittently operated when transmitted twice. Control means comprising first and second logic circuits for switching to perform the operation, and second and third time constant circuits for setting a wiper stop time and a wiper driving time when the wiper intermittently operates; An electronic switch for applying a power supply voltage to the wiper motor when a continuous / intermittent operation signal is transmitted from the means; a control means for transmitting the signal transmitted from the second logic circuit to the wiper motor; A third logic circuit for inverting the output signal, a fourth logic circuit for transmitting an output signal linked to the output signal from the third logic circuit and the wiper-on signal, and an output signal from the fourth logic circuit for inversion. A fifth logic circuit, the second and third time constant circuits being disposed between an output terminal of the fourth logic circuit and an output terminal of the fifth logic circuit; At the time of the intermittent operation, a periodic signal is output from the fifth logic circuit by changing the output signal of the third logic circuit after the lapse of the wiper stop time and the wiper drive time set by the second and third time constant circuits. Output
The electronic switch is turned on or off. Further, the first and second logic circuits are constituted by D flip-flops, the third and fourth logic circuits are each constituted by Schmitt trigger circuits having hysteresis characteristics, and the fifth logic circuit is constituted by It is characterized by comprising an inverter.

[0010] The present invention is also a vehicle wiper control device installed between a wiper motor mounted on a vehicle and a wiper switch for operating the wiper continuously or intermittently, wherein a predetermined time is set. A first time constant circuit, and a wiper switch is continuously operated when a wiper-on signal is transmitted once from a wiper switch within a time set by the first time constant circuit, and the wiper is intermittently operated when transmitted twice. Control means including first and second logic circuits for switching to perform the operation, and second and third time constant circuits for setting a wiper stop time and a wiper driving time when the wiper intermittently operates; An electronic switch for applying a power supply voltage to the wiper motor when a continuous / intermittent operation signal is transmitted from the means; and the control means includes a wiper transmitted from the wiper switch. A third logic circuit for inverting an output signal, a fourth logic circuit for inverting an output signal sent from the second logic circuit, an output signal from the third logic circuit and a signal from the fourth logic circuit. A fifth logic circuit for sending an output signal in conjunction with the output signal, and a sixth logic circuit for inverting the output signal from the fifth logic circuit;
The second and third time constant circuits are provided between the output terminal of the fifth logic circuit and the output terminal of the sixth logic circuit; during the intermittent operation of the wiper, the second and third time constant circuits are provided. After the wiper stop time and wiper drive time set in
The periodic signal is output from the sixth logic circuit by changing the output signal of the logic circuit, and the electronic switch is turned on or off. Also, the first
And the second logic circuit are composed of D flip-flops, the third and sixth logic circuits are each composed of inverters, and the fourth and fifth logic circuits are each a Schmitt trigger circuit having hysteresis characteristics. It is characterized by comprising.

In the control apparatus for a vehicle wiper according to the present invention, the control means and the circuit components constituting the electronic switch are mounted on a board and then inserted into a heat-shrinkable tube to apply heat to the heat-shrinkable tube. And covering the entire substrate on which the circuit components are mounted.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a control device for a vehicle wiper according to a first embodiment of the present invention, and FIG. 2 is a specific circuit diagram thereof. As shown in FIG. 1, a control device 10 for a vehicle wiper according to the present embodiment
Is connected between the changeover switch 11 and the wiper motor 16.

A control device 10 for a vehicle wiper includes a constant voltage power supply section 12 for stabilizing an ignition voltage (generally about 9 to 16 V in a vehicle) supplied from a battery mounted on the vehicle, and a wiper SW on signal. Signal input unit 13 which receives and outputs after shaping and level adjustment
A control unit 14 that receives a signal output from the signal input unit 13 and determines continuous operation or intermittent operation;
And a drive unit 15 that receives a signal from the drive unit 4 and supplies a current necessary for a wiper operation to a wiper motor 16.

As shown in FIG. 2, the constant voltage power supply section 12
It comprises a resistor R11, a Zener diode D11, and a capacitor C11, stabilizes an ignition voltage supplied from a battery E11 via an ignition switch SW13, and outputs the stabilized voltage to the signal input unit 13 and the control unit. 14.

The signal input section 13 includes resistors R12 to R14.
, Diodes D12 and D13, and capacitor C12
And C13. In addition, the control unit 14
Two D flip-flops FF11 and FF12 and NA
Schmitt trigger circuit IC11 operating as ND circuit
IC12, inverter IC13, transistors Tr11 and Tr12, resistors R15 to R26, diodes D14 to D18, and capacitors C14 to C14.
17 are provided.

One end of the wiper switch SW11 is connected to one input terminal of a Schmitt trigger circuit IC12 via a diode D12 and a resistor R13 and to a D flip-flop FF1.
1 and CLOCK of the D flip-flop FF12. A resistor R12 is connected between the diode D12 and the resistor R13, and a capacitor C12 is connected between the resistor R13 and the Schmitt trigger circuit IC12 with one end grounded.

The off-side terminal of the wiper switch SW11 is connected to one end of the motor switch SW12 and to the base of the transistor Tr12 via a diode D18 and a resistor R24. Further, a resistor R23 is provided between the diode D18 and the resistor R24.
A capacitor C17 is connected between the resistor R24 and the transistor Tr12 with one end thereof grounded.
The emitter of the transistor Tr12 is grounded. The other terminal of the wiper switch SW11 passes through the constant voltage power supply unit 12, and is connected to the ignition switch SW13.
Is connected to the battery E11.

The SET of the D flip-flop FF11 is grounded, and DATA is connected to the constant voltage power supply unit 12. RESET is connected to the cathode of diode D14 and to the cathode of diode D15. The anode of the diode D14 is connected to the RESET of the D flip-flop FF12 and is connected to the constant voltage power supply 1 via the capacitor C13.
The resistor R14 and the diode D13 are connected to a connection point between the anode of the diode D14 and the capacitor C13, respectively, with one end grounded.
Further, the anode of the diode D15 is connected to the output Q via a resistor R15 and a parallel connection circuit of the diode D16 and the resistor R16.
4 is grounded. At this time, a first time constant circuit that determines the input time is configured by the resistor R16 and the capacitor C14.

The SET of the D flip-flop FF12 is grounded, and DATA is supplied to the D flip-flop FF12 via a resistor R17.
It is connected to the output Q of the flip-flop FF11 and is grounded via the capacitor C16. The output Q is a Schmitt trigger circuit IC via a resistor R18.
11 is connected to one input terminal.

The output terminal of the Schmitt trigger circuit IC11 is connected to the other input terminal of the Schmitt trigger circuit IC12, and the output terminal of the Schmitt trigger circuit IC12 is connected to the input terminal of the inverter IC13. Inverter IC
13 is connected to the base of Tr11 via a resistor R22, and to the other input terminal of the Schmitt trigger circuit IC11 via a resistor R19 and a parallel connection circuit of resistors R20 and R21 and a diode D17. Is done. A capacitor C15 is connected between a connection point of the Schmitt trigger circuit IC12 and the inverter IC13 and a connection point of the parallel connection circuit and the resistor R19. At this time, a second time constant circuit is formed by the capacitor C15 and the resistor R20, and the capacitor C15 and the resistor R20
And a resistor R21 constitute a third time constant circuit.

The collector of the transistor Tr11 is connected to the collector of the transistor Tr12, connected to the battery E11 via a resistor R25 and an ignition switch SW13, and further connected to the drive unit 15 via a resistor R26. Also, the transistor Tr11
Are grounded. The driving unit 15 includes a MOS-
The electronic switch is composed of an FET 11, and the gate is connected to the control unit 14, the source is connected to the battery E11 via the ignition switch SW13, and the drain is connected to the wiper motor 16.

Next, the operation of this embodiment will be described with reference to the timing charts shown in FIGS.
When the driver turns on the ignition switch SW13, the ignition voltage output from the battery E11 is supplied to the constant voltage power supply unit 12. Then, the voltage is stabilized by the constant voltage power supply unit 12, and after the H level is input to the RESET of the D flip-flop FF11 and the D flip-flop FF12 for several seconds by the capacitor C13 and the resistor R14, the L level is input.

Then, the driver operates the wiper switch SW11.
Is turned on, L level is input to SET and RESET of the D flip-flop FF11, and CLO
Since the rising signal is input to CK, the output Q of the D flip-flop FF11 outputs the H level of DATA. Then, since a voltage is applied to the first time constant circuit constituted by the capacitor C14 and the resistor R16, a time constant t11 (for example, 3) determined by the capacitance of the capacitor C14 and the resistance value of the resistor R16. Second), the voltage gradually rises, and the input to RESET reaches the H level. Therefore, the output Q outputs the L level after the elapse of the time t11.

On the other hand, when the wiper switch SW11 is turned on, the SET and RESE of the D flip-flop FF12 are turned on.
An L level is also input to T, and a rising signal is input to CLOCK. Although the output Q outputs DATA, DATA is initially at L level and becomes H level after being delayed by a time constant determined by the resistance value of the resistor R17 and the capacitance of the capacitor C16. Q outputs the L level which is the original DATA. At this time, the time constant determined by the resistance value of the resistor R17 and the capacitance of the capacitor C16 is set to be sufficiently shorter than the time constant set by the first time constant circuit.

Therefore, the Schmitt trigger circuit IC1
1 outputs the H level, and the Schmitt trigger circuit IC12
Outputs an L level from the H level input from the signal input unit 13 and the H level output from the Schmitt trigger circuit IC11. Therefore, since the inverter IC 13 outputs the H level, the collector voltage of the transistor Tr11 becomes the L level, and the L level is input to the driving unit 15.
When the L level is input to the drive unit 15, the electronic switch F
An amplified current flows between the source and the drain of the ET 11 and the electronic switch FET 11 is turned on, so that the wiper motor 16 is energized and operates. This is the wiper switch S
It operates continuously while W11 is on.

When the driver turns on the wiper switch SW11 again within the time constant t11 set by the first time constant circuit after turning on the wiper switch SW11, D
The output Q of the flip-flop FF12 outputs the H level of DATA, and the Schmitt trigger circuit IC11 outputs the L level. The Schmitt trigger circuit IC12 outputs an H level based on the H level input from the signal input unit 13 and the L level output from the Schmitt trigger circuit IC11, and the inverter IC13 outputs an L level. Therefore, the collector voltage of the transistor Tr11 becomes H level, and the driver unit 15 inputs H level. Drive unit 15
, The electronic switch FET11 is turned off, and the wiper motor 16 stops.

At this time, the Schmitt trigger circuit IC12
Is at the H level, and the output terminal of the inverter IC 13 is at the L level.
Level, the capacitor C15 and the resistor R2
At the connection point with 0, the voltage gradually decreases from the H level, and goes to the L level after the elapse of the time constant t12 (for example, 10 seconds) of the second time constant circuit including the capacitor C15 and the resistor R20.

Then, the output terminal H of the D flip-flop FF12 is connected to the input terminal of the Schmitt trigger circuit IC11.
The L level is input together with the level, so that the output of the Schmitt trigger circuit IC11 becomes the H level. Therefore, the Schmitt trigger circuit IC12 outputs the L level, the inverter IC13 outputs the H level, the collector voltage of the transistor Tr11 becomes the L level, and inputs the L level to the driving unit 15. When the L level is input to the drive unit 15, the electronic switch FET11 is turned on, and the wiper motor 16 is energized and operates.

At this time, the Schmitt trigger circuit IC12
Is at the L level and the output terminal of the inverter IC 13 is at the H level.
Level, a current flows through the third time constant circuit constituted by the parallel combined resistance of the resistors R20 and R21 and the capacitor C15. At this time constant t13 (for example, 1 second), The voltage at the connection point between C15 and the parallel combined resistor gradually rises from the L level,
Reach level.

Thus, the Schmitt trigger circuit IC1
1 is at the L level, and the Schmitt trigger circuit I
C12 outputs an H level, and inverter IC13 outputs an L level. Therefore, the collector voltage of the transistor Tr11 is at the H level, and the H level is input to the driving unit 15. When the H level is input to the drive unit 15,
Since the electronic switch FET11 is turned off, the wiper motor 16 stops. By repeating the above operation, the wiper motor 16 can be driven and stopped at a predetermined cycle, and the intermittent operation can be performed. Specifically, the wiper can be operated once at an interval of time t11 (10 seconds).

After turning off the wiper switch SW11,
Schmitt trigger circuit IC from motor switch SW12
When the L level is input to 12, the Schmitt trigger circuit IC12 outputs the H level, and the inverter IC13 outputs the L level. Therefore, the collector voltage of the transistor Tr11 becomes the H level, and the H level is input to the driving unit 15. . When an H level is input to the drive unit 15, the electronic switch FET11 is turned off, and the wiper motor 16 stops.

Here, since the motor switch SW12 is turned on when the wiper motor 16 starts moving, even if the wiper switch SW11 is turned off during the operation of the wiper motor 16, the transistor Tr12 is turned on by the motor switch SW12.
Level is input to the base of the transistor Tr12.
Becomes the L level, and the L level is input to the driving unit 15. When the L level is input to the drive unit 15, the electronic switch FET11 is turned on, so that the wiper motor 1
Reference numeral 6 keeps energized and operates.

After that, when the wiper motor 16 returns to a predetermined position (where the wiper is settled at a fixed position), the motor switch SW12 is turned off, so that the collector voltage of the transistor Tr12 becomes H level, and the H level is inputted to the drive unit 15. Therefore, the wiper motor 16 stops. Since this is repeated every time the wiper motor 16 moves, if the ignition switch SW13 is turned on, the wiper motor 16 always stops at a predetermined position without stopping halfway.

FIG. 4 is an explanatory view showing a state in which various circuit components constituting the control device 10 of the vehicle wiper are covered with the heat-shrinkable tube 17. The heat-shrinkable tube 17 is made of, for example, polyolefin resin, elastomer,
After inserting the entire board, which is made of various materials such as fluororesin, and on which the circuit constituting the control device 10 is mounted, into the heat-shrinkable tube 17, heat is applied to the heat-shrinkable tube 17 to shrink the whole. To protect the circuit. The controller 10 is connected between the changeover switch 11 and the vehicle-side harness on which the wiper motor 16 is installed.
The control device can be attached to the vehicle by connecting the control device later.

As described above, the vehicle wiper control device 10 according to the present embodiment is installed between the existing change-over switch 11 and the wiper motor 16 so that the time t
When the changeover switch is turned on once in 11, continuous operation is performed.
When turned on, intermittent operation can be performed, so even in models that have only one function of intermittent operation or continuous operation, continuous operation and intermittent operation of the wiper can be performed with simple operation without attaching a new switch to the vehicle. Obtainable. Further, the control device 10 is connected to
By covering with such a material, damage and deterioration due to contact with the outside can be prevented in a lightweight and compact state. Furthermore, since it can be retrofitted to existing circuits with simple operations, the number of installation steps can be reduced,
If only the connector 18 is changed, it can be applied to various vehicles.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a block diagram showing a configuration of a control device for a vehicle wiper according to a second embodiment of the present invention, and FIG. 6 is a specific circuit diagram thereof.
The vehicle wiper control device 30 of the present embodiment is connected between the changeover switch 31 and the wiper motor 36 as in the first embodiment described above, and includes a constant voltage power supply unit 32,
A signal input unit 33, a control unit 34, and a drive unit 35 are provided.

The constant voltage power supply section 32 includes a resistor R31, a Zener diode D31, and a capacitor C31, stabilizes an ignition voltage supplied from a battery E31 via an ignition switch SW33, and stabilizes the ignition voltage. The voltage is supplied to the signal input unit 33.

The signal input section 33 includes resistors R32 to R34.
, Diodes D32 and D33, and capacitor C32
And C33. In addition, the control unit 34
Two D flip-flops FF31 and FF32, inverters IC31 and IC34, Schmitt trigger circuits IC32 and IC33 operating as NAND circuits,
Resistors R35 to R42 and diodes D34 to D37
And capacitors C34 to C36.

One end of the wiper switch SW31 is connected to the cathode of the diode D32, and the other end is grounded. The anode of the diode D32 is connected to the constant voltage power supply unit 32 through a parallel connection circuit of the resistor R32 and the capacitor C32, and the resistor R3
3 is connected to the inverter IC 31. The output terminal of the inverter IC31 is a D flip-flop FF3
1 and FF32, and is connected to one input terminal of the Schmitt trigger circuit IC33.

The SET of the D flip-flop FF31 is grounded, and the DATA is connected to the constant voltage power supply 32. Further, RESET is connected to the cathode of the diode D34 and to the cathode of the diode D35. The anode of the diode D34 is connected to the RESET of the D flip-flop FF32 and is connected to the constant voltage power supply 3 via the capacitor C33.
2 and a connection point between the anode of the diode D34 and the capacitor C33 is connected to a resistor R34 and a diode D33 each having one end grounded.
Further, the anode of the diode D35 is connected to the output Q via a resistor R35 and a parallel connection circuit of the diode D36 and the resistor R36, and the capacitor C3
4 is grounded. At this time, a first time constant circuit that determines the input time is configured by the resistor R36 and the capacitor C34.

The SET of the D flip-flop FF32 is grounded, and DATA is connected to the D flip-flop FF32 via a resistor R37.
Connected to the output Q of the flip-flop FF31 and grounded via the capacitor C36. The output Q is a Schmitt trigger circuit IC via a resistor R38.
32 is connected to one input terminal.

The output terminal of the Schmitt trigger circuit IC32 is connected to the other input terminal of the Schmitt trigger circuit IC33, and the output terminal of the Schmitt trigger circuit IC33 is connected to the input terminal of the inverter IC34. Inverter IC
34 is connected to the drive unit 35 via a resistor R42 and connected to the other input terminal of the Schmitt trigger circuit IC32 via a resistor R40 and a parallel connection circuit of a resistor R41 and a diode D37. Is done. A capacitor C35 is connected between a connection point of the Schmitt trigger circuit IC33 and the inverter IC34 and a connection point of the parallel connection circuit and the resistor R39. At this time, a second time constant circuit is configured by the capacitor C35 and the resistor R40, and a third time constant circuit is configured by the capacitor C35, the resistor R40, and the resistor R41.

The drive unit 35 is composed of an electronic switch FET 31 composed of a MOS-FET 31. The gate is connected to the control unit 34, the source is connected to the wiper motor 36, and the drain is grounded.

Next, the operation of this embodiment will be described. When the driver turns on the ignition switch SW33,
The ignition voltage output from the battery E31 is supplied to the constant voltage power supply unit 32. And the constant voltage power supply unit 3
2 stabilizes the voltage, the capacitor C33 and the resistor R3
4, the H level is input to the RESET of the D flip-flop FF31 and the D flip-flop FF32 for several seconds, and then the L level is input.

Then, the driver operates the wiper switch SW31.
Is turned on, the L level is input to the SET and RESET of the D flip-flop FF31, and the L level is input to the inverter IC31. Therefore, the inverter IC31 outputs the H level, and the rising signal is input to the CLOCK of the D flip-flop FF31.
Outputs the H level of TA. Then, the capacitor C34
Since a voltage is applied to the first time constant circuit constituted by the resistor R36 and the resistor R36, the voltage is applied with a time constant t31 (for example, 3 seconds) determined by the capacitance of the capacitor C34 and the resistance of the resistor R36. Gradually rises, and the input to RESET is H
Reach level. Therefore, the output Q outputs the L level after the elapse of the time t31.

On the other hand, when the wiper switch SW31 is turned on, the SET and RESE of the D flip-flop FF32 are set.
The L level is also input to T, and a rising signal is input to CLOCK of the D flip-flop FF32. The output Q of the D flip-flop FF32 outputs DATA. DATA is initially at L level, and after being delayed by a time constant determined by the resistance value of the resistor R37 and the capacitance of the capacitor C36, the H level is output. Therefore, the output Q outputs the L level which is the original DATA. At this time, the resistance value of the resistor R37 and the capacitor C36
Is set so as to be sufficiently shorter than the time constant set by the first time constant circuit.

Therefore, the Schmitt trigger circuit IC3
2 outputs the H level, and the Schmitt trigger circuit IC33
Is L between the H level output from the inverter IC31 and the H level output from the Schmitt trigger circuit IC32.
Output level. Therefore, the inverter IC 34 outputs the H level, and inputs the H level to the driving unit 35. When the H level is input to the drive unit 35, the electronic switch FET
An amplified current flows between the source and drain of the wiper motor 31 and the electronic switch FET 31 is turned on.
6 is energized and operates. This is the wiper switch SW3
It operates continuously while 1 is turned on.

When the driver turns on the wiper switch SW31 again within the time constant t31 set by the first time constant circuit after turning on the wiper switch SW31, D
The output Q of the flip-flop FF32 outputs the H level of DATA, and the Schmitt trigger circuit IC32 outputs the L level. The Schmitt trigger circuit IC33 outputs an H level based on the H level output from the inverter IC31 and the L level output from the Schmitt trigger circuit IC32, and the inverter IC34 outputs an L level. Is entered. Drive unit 35
, The electronic switch FET31 is turned off, and the wiper motor 36 stops.

At this time, the Schmitt trigger circuit IC 33
Is at the H level, and the output terminal of the inverter IC 34 is at the L level.
Level, the capacitor C35 and the resistor R3
At the connection point with No. 9, the voltage gradually decreases from the H level, and goes to the L level after the elapse of the time constant t32 (for example, 10 seconds) of the second time constant circuit including the capacitor C35 and the resistor R40.

Then, the output terminal of the D flip-flop FF32, H, is input to the input terminal of the Schmitt trigger circuit IC32.
The L level is input together with the level, so that the output of the Schmitt trigger circuit IC32 becomes the H level. Therefore, the Schmitt trigger circuit IC33 outputs the L level, the inverter IC34 outputs the H level, and inputs the H level to the driving unit 35. When an H level is input to the drive unit 35, the electronic switch FET31 is turned on.
The wiper motor 36 is energized and operates.

At this time, the Schmitt trigger circuit IC 33
Is low and the output of inverter IC34 is high.
Level, a current flows through the third time constant circuit formed by the parallel combined resistance of the resistors R40 and R41 and the capacitor C35. At this time constant t33 (for example, 1 second), the capacitor is discharged. The voltage at the connection point between C35 and the parallel combined resistor gradually rises from the L level,
Reach level.

Thus, the Schmitt trigger circuit IC3
2 is at the L level, and the Schmitt trigger circuit I
C33 outputs the H level, and the inverter IC outputs the L level, and thus inputs the L level to the drive unit. When the L level is input to the drive unit 35, the electronic switch FET31 is turned off, and the wiper motor 36 stops. By repeating the above operation, the wiper motor 36 can be driven and stopped at a predetermined cycle, and the intermittent operation can be performed. Specifically, the wiper can be operated once at an interval of time t31 (10 seconds).

When the wiper switch SW31 is turned off,
Inverter IC31 outputs L level. Therefore, the Schmitt trigger circuit IC33 outputs the H level and the inverter IC outputs the L level, and the driving unit 35 outputs the L level.
Enter the level. When the L level is input to the drive unit 35, the electronic switch FET31 is turned off, and the wiper motor 36 stops.

Since the motor switch SW32 is turned on when the wiper motor 36 starts moving, the wiper motor 36 continues to operate even if the wiper switch SW31 is turned off during the operation of the wiper motor 36. afterwards,
When the wiper motor 36 returns to the predetermined position, the motor switch S
Since W32 is turned off, the wiper motor 36 stops.
This is repeated every time the wiper motor 36 moves, so if the ignition switch SW33 is on,
The wiper motor 36 always stops at a predetermined position. Also in the present embodiment, the point covered by the heat-shrinkable tube 17 and the point of later connection using the connector 18 are the same as the configuration shown in FIG.

As described above, the vehicle wiper control device 30 according to the present embodiment is installed between the existing changeover switch 31 and the wiper motor 36 in the same manner as in the first embodiment described above, so that the time is reduced. During t31, the switch can be turned on once to operate continuously, and turned on twice to operate intermittently. Therefore, even if the vehicle has only one of the functions of intermittent operation or continuous operation, a new switch is attached to the vehicle. The continuous and intermittent operation of the wiper can be obtained by a simple operation without any operation. Further, by covering the control device 30 with the heat-shrinkable tube 17, damage and deterioration due to contact with the outside can be prevented in a lightweight and compact state. In addition, since it can be retrofitted to existing circuits with simple tasks,
The number of mounting steps can be reduced, and if only the connector 18 is changed, it can be applied to various vehicles.

In the present invention, the time set in each time constant circuit is appropriately set according to the resistance value of the resistor constituting the time constant circuit and the capacitance of the capacitor, and is set to an arbitrary time. be able to. Although an example in which a MOS-FET is used as an electronic switch has been described, an electronic switch having a similar function such as a switching transistor or an IGBT can be used. Further, in the above embodiment, the control device is retrofitted using the connector. However, it is needless to say that the control device may be installed in the initial assembling process and is not limited to the above embodiment.

[0057]

As described above, the vehicle wiper control device according to the present invention can be installed in a vehicle having only one of the intermittent operation and continuous operation wiper operation functions, so that a new switch is not attached to the vehicle. Since the continuous operation and intermittent operation of the wiper can be obtained with a simple operation, the operability can be improved.

Further, by covering the circuit components and the entire substrate on which the circuit components are mounted by using the heat-shrinkable tube, there is no need to install a controller case, so that the size, weight and cost can be reduced. In addition, damage and deterioration due to contact with the outside can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a control device for a vehicle wiper according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a specific configuration of a vehicle wiper control device according to the first embodiment of the present invention.

FIG. 3 is a timing chart showing an operation of the control device for the vehicle wiper according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a state in which various components constituting the control device for the vehicle wiper according to the first embodiment of the present invention are covered with a heat-shrinkable tube.

FIG. 5 is a block diagram showing a configuration of a control device for a vehicle wiper according to a second embodiment of the present invention.

6 is a circuit diagram showing a specific configuration of a control device for a vehicle wiper shown in FIG. 5;

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 Control device for vehicle wiper 11 Changeover switch 12 Constant voltage power supply unit 13 Signal input unit 14 Control unit 15 Drive unit 16 Wiper motor 17 Heat shrink tube 18 Connector SW11 Wiper switch SW12 Motor switch SW13 Ignition switch IC11, IC12 Schmitt trigger circuit IC13 Inverter FF11, FF12 D flip-flop E1 Battery FET11 Electronic switch

Claims (8)

[Claims] 1. A control device for a vehicle wiper installed between a wiper motor mounted on a vehicle and a wiper switch for continuously or intermittently operating the wiper, wherein a wiper on signal is output from the wiper switch within a predetermined time. Control means for switching the wiper to operate continuously when transmitted once, and to operate the wiper intermittently when transmitted twice, when the continuous / intermittent operation signal is transmitted from the control means, An electronic switch for applying a power supply voltage to a wiper motor, the control device for a vehicle wiper. 2. A control device for a vehicle wiper, which is installed between a wiper motor mounted on a vehicle and a wiper switch and continuously or intermittently operates the wiper, comprising: a first device for setting a certain time; A time constant circuit, the wiper is continuously operated when a wiper-on signal is transmitted once from the wiper switch within a time set by the first time constant circuit, and the wiper is intermittently operated when transmitted twice. Control means comprising: first and second logic circuits for switching as described above; and second and third time constant circuits for setting a wiper stop time and a wiper drive time when the wiper operates intermittently. An electronic switch for applying a power supply voltage to the wiper motor when a continuous / intermittent operation signal is transmitted from the means. 3. The control device for a vehicle wiper according to claim 2, wherein the first and second logic circuits are configured by D flip-flops. 4. A control device for a vehicle wiper, which is installed between a wiper motor mounted on a vehicle and a wiper switch and continuously or intermittently operates the wiper, wherein a first predetermined time is set. A time constant circuit, the wiper is continuously operated when a wiper-on signal is transmitted once from the wiper switch within a time set by the first time constant circuit, and the wiper is intermittently operated when transmitted twice. And a second logic circuit for setting the wiper stop time and the wiper driving time when the wiper intermittently operates, and control means for controlling this control. An electronic switch for applying a power supply voltage to the wiper motor when a continuous / intermittent operation signal is transmitted from the means, wherein the control means transmits the power supply voltage from the second logic circuit. A third logic circuit for inverting the obtained signal, a fourth logic circuit for sending an output signal in conjunction with the output signal from the third logic circuit and the wiper-on signal, and a fourth logic circuit A fifth logic circuit for inverting an output signal of the second logic circuit, wherein the second and third time constant circuits are connected to an output terminal of the fourth logic circuit and an output terminal of the fifth logic circuit. During the intermittent operation of the wiper, changing the output signal of the third logic circuit after the lapse of the wiper stop time and the wiper drive time set by the second and third time constant circuits. A fifth aspect of the present invention provides a control device for a vehicle wiper, wherein a periodic signal is output from the fifth logic circuit to turn on or off the electronic switch. 5. The control device for a vehicle wiper according to claim 4, wherein said first and second logic circuits are constituted by D flip-flops, and said third and fourth logic circuits each have a hysteresis characteristic. A Schmitt trigger circuit having
The control device for a vehicle wiper, wherein each of the fifth logic circuits includes an inverter. 6. A vehicle wiper control device installed between a wiper motor mounted on a vehicle and a wiper switch for continuously or intermittently operating a wiper, wherein a first predetermined time is set. A time constant circuit, the wiper is continuously operated when a wiper-on signal is transmitted once from the wiper switch within a time set by the first time constant circuit, and the wiper is intermittently operated when transmitted twice. And a second logic circuit for setting the wiper stop time and the wiper driving time when the wiper intermittently operates, and control means for controlling this control. An electronic switch for applying a power supply voltage to the wiper motor when a continuous / intermittent operation signal is transmitted from the means; A third logic circuit for inverting the obtained wiper-on signal, a fourth logic circuit for inverting the output signal sent from the second logic circuit, an output signal from the third logic circuit, and the third logic circuit. A fifth logic circuit for transmitting an output signal in conjunction with an output signal from the fourth logic circuit, and a sixth logic circuit for inverting the output signal from the fifth logic circuit; The second and third time constant circuits are provided between an output terminal of the fifth logic circuit and an output terminal of the sixth logic circuit, and the second and third time constant circuits are provided during the intermittent operation of the wiper. After the wiper stop time and the wiper drive time set by the time constant circuit have elapsed, the output signal of the fourth logic circuit is changed to output a periodic signal from the sixth logic circuit, and the electronic switch On or off Control device for a vehicle wiper. 7. The control device for a vehicle wiper according to claim 6, wherein said first and second logic circuits are constituted by D flip-flops, and said third and sixth logic circuits are each constituted by inverters. And the fourth and fifth logic circuits each include a Schmitt trigger circuit having a hysteresis characteristic. 8. The control device for a vehicle wiper according to claim 1, wherein the control means and a circuit component constituting the electronic switch are mounted on a substrate and then placed in a heat-shrinkable tube. A wiper control device for a vehicle, wherein the control device inserts and applies heat to the heat-shrinkable tube to cover the entire board on which the circuit component is mounted.