JPH066133U - Wiper control device - Google Patents

Abstract

(57) [Abstract] [Purpose] A wiper control device that achieves high reliability by making the connection wiring from the wiper switch to the controller as small as possible and not hindering other devices. provide. [Structure] A wiper motor 4 and a washer pump 5 are connected to a control mechanism 3 and a wiper switch 2 is connected to the control mechanism 3, and only a signal of a predetermined voltage level generated by the wiper switch 2 is transferred to the control mechanism 3. Wiper control device 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wiper control device used to control start / stop of a wiper motor and operation of a washer in a wiper in which a wiper blade wipes a wiped surface such as a windshield glass with the power of a wiper motor.

[0002]

[Prior art]

 As a wiper control device for controlling the start / stop of the wiper motor, a wiper switch in which one brush terminal is connected to the other brush terminal of the wiper motor connected to the power supply ACC, and a wiper motor that operates by the wiper switch are operated. It is known that the controller is provided with a controller that forms a ground circuit.

In such a wiper control device, the wiper motor is installed in the engine room, the wiper switch is installed in the steering column, and the controller is installed in the instrument panel. When the wiper switch is turned on, the power supply ACC → wiper motor → wiper switch → controller → The wiper motor was being driven by the current flowing to the ground.

[0004]

[Conventional problems]

 However, the conventional wiper control device has a structure in which the drive power source for the wiper motor is passed through the wiper switch, so that the current is large, and the wire diameter of the connection wiring from the wiper switch to the controller is It must be large enough to handle large currents, and by connecting a large wire diameter from the instrument panel where the wiper switch is located to the steering column where the wiper switch is located, a wireless radio control system or automatic There was a problem in that it was necessary to consider the possibility of causing radio interference to signal devices such as the driving position system.

[0005]

[Problems to be solved by the device]

 The problem to be solved by the invention is that if the drive power of the wiper motor is passed through the wiper switch, the wire diameter of the connection wiring from the wiper switch to the controller must be large.

[0006]

[Constitution of device]

[0007]

[Means for Solving the Problems]

 The wiper control device according to the present invention uses a stop wire, an intermittent mode, a low speed mode, and a high speed mode in order to make the connecting wire from the wiper switch to the controller as small as possible and not to hinder other devices. Connected to the wiper switch and the wiper switch that sets the resistance value corresponding to the mode by switching to the cleaning mode and the resistance value corresponding to the pause time arbitrarily set in the intermittent mode. At the same time, it has a control mechanism that recognizes the resistance value corresponding to the mode of the wiper switch and supplies power to the wiper motor and the washer pump, and connects the wiper motor driven by the power supply from the control mechanism to the control mechanism. Install a washer pump driven by the power supply from the control mechanism. It is characterized in that it is connected to a control mechanism, and in a more preferable embodiment, a resistance value corresponding to the mode is set by switching to a stop mode, an intermittent mode, a low speed mode, a high speed mode, and a cleaning mode, and an arbitrary value is set in the intermittent mode. Is equipped with a wiper switch for setting a resistance value corresponding to the set down time, and is connected to the wiper switch to determine the mode of the resistance value of the wiper switch by the voltage level and output signal of the determined mode. An input discrimination circuit that generates a signal, a prohibition circuit that generates a prohibition signal when the input discrimination circuit generates an output signal other than the intermittent mode, and a prohibition signal that is generated from the prohibition circuit, A quick charge circuit that rapidly charges the first capacitor of the intermittent timer circuit for the first wiper of the wiper, and a quick charge circuit described above. It is equipped with the first capacitor for transferring the output signal to the motor drive circuit, which is charged and determines the intermittent off time by the charging time corresponding to the setting rest time of the wiper switch and the intermittent on time by the discharging time. The intermittent timer circuit and the input discrimination circuit transfer the output signal to the pump drive circuit while the output signal in the cleaning mode is being generated, and the charge signal is charged by the output signal in the cleaning mode to any potential. Drive the motor drive circuit and apply the OFF delay to the motor drive circuit by the discharge time after the output signal disappears, and set the ON delay time and the post-wiping time of the wiper motor in the cleaning mode to drive the motor. A washer timer circuit having a second capacitor for transferring an output signal to the circuit, and an output signal from the input discrimination circuit, The control mechanism includes the motor drive circuit that operates with either the output signal from the first capacitor or the output signal from the second capacitor, and the pump drive circuit that operates with the output signal in the cleaning mode from the input determination circuit. In addition, a wiper motor driven by the operation of the motor drive circuit and a washer pump driven by the operation of the pump drive circuit are connected to the control mechanism. A single signal line that transfers an inhibit signal to the intermittent timer circuit and a rapid charge release signal to the rapid charging circuit is provided between the and the rapid charging circuit and the intermittent timer circuit. In a more preferred embodiment, the intermittent timer circuit is set by the charging current to the capacitor and the wiper switch. In a more preferred embodiment, the washer timer circuit is provided with a hysteresis circuit for setting the output on-delay time and the off-delay time. The feature is that multiple timers can be set with a single capacitor by making the wire diameter of the connection wiring from the wiper switch to the control mechanism small, and power failure to other signal equipment. The aim is to provide a wiper control device that can improve reliability by not giving it.

[0008]

[Action]

 In the wiper control device according to the present invention, the wiper motor and the washer pump are connected to the control mechanism, and the wiper switch is also connected to the control mechanism. Only the signal generated by the resistance set by the wiper switch is transferred to the control mechanism. A drive current for the wiper motor and the washer pump flows through the control mechanism. Therefore, a signal of a predetermined voltage level flows in the wiper switch, and neither the drive current of the wiper motor nor the drive current of the washer motor flows.

[0009]

【Example】

 1 to 4 show an embodiment of a wiper control device according to the present invention.

The illustrated wiper control device 1 is mainly composed of a wiper switch 2 and a control mechanism 3 connected to the wiper switch 2, and a wiper motor 4 and a washer pump 5 are connected to the control mechanism 3. The control mechanism is arranged in the instrument panel of the vehicle or in the engine room, the wiper motor 4 is arranged in the vicinity of the instrument panel in the engine room, and the wiper switch 2 is arranged in the steering column.

The wiper switch 2 is operated in a stepless dial manner to set a stop mode, an intermittent mode, a low speed mode, and a high speed mode, and is synchronized with the first switch section 2a. In addition, the first switch unit 2a is provided with a second switch unit 2b for arbitrarily setting a pause time in the intermittent mode when the first switch unit 2a is in the intermittent mode, and for setting a cleaning mode by pressing at each position of the first switch unit 2a. .

The first switch unit 2a is provided with a first variable resistor Vr1, and the first variable resistor Vr1 is operated in the order of stop mode, intermittent mode, low speed mode, and high speed mode. The resistance value is set to be small by performing the operation, and the voltage level of the power supply terminal 2d is set to the first mode corresponding to the stop mode via the first variable resistor Vr1 by dialing the first switch section 2a. Voltage level (lowest voltage level range.), Second voltage level corresponding to intermittent mode (second lowest voltage level range.), Third voltage level corresponding to low speed mode (third voltage level). Low voltage level range), and a fourth voltage level (highest voltage level range) compatible with the high-speed mode in four divisions before being generated from the output terminal 2e. It

The second switch unit 2b is provided with a second variable resistor Vr2, and the second variable resistor Vr2 is operated by dial operation to select an intermittent mode for a long down time, an intermittent mode for a short down time and a pressing operation. The resistance values are set to decrease in the order of the cleaning mode by the operation, and the second switch section 2b has a long pause time, an intermittent mode and a short pause time when the first switch section 2a is switched to the intermittent mode. By performing the dial operation in the order of the intermittent mode, the voltage level of the power supply terminal 2d via the second variable resistor Vr2 is set to the voltage level for setting the intermittent mode for a long rest time (the range of the lowest voltage level), and the short. The voltage level for setting the intermittent mode of the pause time (the range of the second lowest voltage level), each setting mode by the first switch unit 2a, and The voltage level of the cleaning mode (highest voltage level) which is generated only while the switch 2b is pressed regardless of the intermittent mode of the set time is converted into three and generated from the output terminal 2f.

In FIG. 2 illustrating the main part of the control mechanism 3, the control mechanism 3 includes a first input determination circuit 10 a that constitutes a part of the input determination circuit 10 and another part of the input determination circuit 10. The second input discriminating circuit 10b, the prohibiting circuit 11, the quick charging circuit 12, the intermittent timer circuit 13, the first output driving circuit 14a which is a motor driving circuit for switching the motor low speed / high speed, and the motor driving circuit A certain second output drive circuit 14b, a third output drive circuit 14c which is a pump drive circuit, and a washer timer circuit 15 are provided.

Further, in the control mechanism 3, as is apparent from FIG. 1, a power supply terminal 3 a connected to the power supply terminal 2 d of the wiper switch 2 by a connection wire 21 and a connection wire 22 to the output terminal 2 e of the wiper switch 2 are connected. One input terminal 3b connected to the output terminal 2f of the wiper switch 2 and the other input terminal 3c connected to the output terminal 2f of the wiper switch 2 via a connecting wire 23 are provided, and a power supply terminal 3d connected to a power supply VB, which is a battery, The washer terminal 3e connected to the other brush terminal 5a of the washer pump 5, the stop position signal input terminal 3f connected to the movable contact 4a1 of the fixed position stopping means 4a of the wiper motor 4, and the wiper motor 4 Is connected to the low speed brush terminal 4b provided on the wiper motor 4, and is connected to the high speed brush terminal 4c provided on the wiper motor 4. Further, a high speed terminal 3h and grounded ground terminals 3j and 3k are provided. The power supply terminal 3a for the wiper switch 2 is connected from the power supply terminal 3d of the control mechanism 3 to one end of a zener diode ZD1 whose other end is grounded via a diode D1 and a resistor r39, and is made a constant voltage by the zener diode ZD1. Power (Vcc) is being applied.

The brush terminal 5b provided on the washer pump 5, the power source terminal 4d provided on the wiper motor 4, and the normally closed fixed contact 4a2 of the fixed position stopping means 4a provided on the wiper motor 4 are connected to the power source VB, respectively. It is connected and the normally open fixed contact 4a3 of the fixed position stopping means 4a is grounded. The washer pump 5 sprays the cleaning liquid stored in a washer tank (not shown) from the nozzle toward the wiping surface by energizing the brush terminal 5b from one brush terminal 5b to the other brush terminal 5a.

The fixed position stopping means 4a has a movable contact 4a1 connected to a motor shaft 4e of the wiper motor 4, and the movable contact 4a1 has a wiper blade connected to the motor shaft 4e via a link (not shown) on a wiped surface. The position of the wiper blade is detected by contacting the normally closed fixed contact 4a2 when the stop position is reached and the normally open fixed contact 4a3 when the wiper blade is outside the predetermined stop position. When the wiper switch 2 is in the stop mode when the wiper blade is not at the predetermined stop position, the wiper motor 4 forms an energization path until the wiper blade reaches the predetermined stop position, and the wiper blade moves to the predetermined stop position. It has a function to apply sudden braking to the wiper motor 4 when it reaches.

The first input discriminating means 10a includes IC1, IC2, IC3, a resistor r1, a resistor r2, a resistor r3, a resistor r4, a resistor r5, a resistor r6, and a resistor r7. The negative side input of IC1 is resistor r1 + resistor r2 and resistor r3 + resistor r4 + resistor r5, and the negative side input of IC2 is resistor r1 + resistor r2 + resistor r3 and resistor r4 + resistor. Due to the voltage division of r5, the positive side input of IC3 obtains the reference voltage by the voltage division of resistor r1 + resistor r2 + resistor r3 + resistor r4 and resistor r5. Since the positive side input of IC1, the positive side input of IC2, and the negative side input of IC3 are connected to one input terminal 3b through a resistor r6 and a resistor r7 whose one end is grounded, the reference voltage And an output is generated as a result of comparing the first voltage level, the second voltage level, the third voltage level, and the fourth voltage level.

When the potential of one input terminal 3b is at the first voltage level by the wiper switch 2, the output of IC1 becomes low level, the output of IC2 becomes low level, and the output of IC3 becomes high level. When the potential of one of the input terminals 3b is at the second voltage level, the output of IC1 is low level, the output of IC2 is low level, and the output of IC3 is low level. When the potential of one input terminal 3b is at the third voltage level, the output of IC1 is low level, the output of IC2 is high level, and the output of IC3 is low level. When the potential of the one input terminal 3b is at the fourth voltage level, the output of IC1 becomes high level, the output of IC2 becomes high level, and the output of IC3 becomes low level.

The first input discriminating circuit 10a turns on the transistor Tr1 provided in the first output driving circuit 14a when the output of the IC1 is at a high level, and inhibits the output of the IC2 to be at a high level, which will be described later. The transistor Tr4 included in the circuit 11 is turned on, the transistor Tr2 included in the second output drive circuit 14b is turned on, and the transistor Tr4 of the prohibition circuit 11 is turned on when the output of the IC3 is at a high level.

The second input discriminating circuit 10b includes an IC4, a transistor Tr7, a resistor r8, a resistor r18, and a resistor r19. The positive side input of the IC4 has a resistor r1 and a resistor r2 + a resistor r3 + a resistor r4 + a resistor. The reference voltage is obtained by the voltage division of the device r5. The negative side input of IC4 is connected to the other input terminal 3c via a resistor r8.

The IC4 of the second input determination circuit 10b becomes a high level when the voltage level of the other input terminal 3c is a voltage level other than the cleaning mode by the wiper switch 2, and the voltage level of the other input terminal 3c becomes The output is low level at the wash mode voltage level. When the output of the IC4 becomes low level, the transistor Tr7 is turned on to turn on the transistor Tr3 of the third output drive circuit 14c described later, and the second capacitor C2 provided in the washer timer circuit 15 described later is supplied with the charging current. Supply.

The inhibition circuit 11 connected to the first input determination circuit 10a includes a transistor Tr4, a resistor r9, a resistor r10, a resistor r13, a diode D2, and a diode D3.

The prohibition circuit 11 is connected to the quick charge circuit 12 and the intermittent timer circuit 13 by a single signal line 24, and is the output of the IC2 provided in the first input determination circuit 10a at a high level? The output of IC2 is low level and the output of IC3 is low depending on the combination of two logics, that is, low level and the output of IC3 provided in the first input discrimination circuit 10a is high level or low level. When the output is at the low level, the wiper switch 2 recognizes that the wiper switch 2 is in the intermittent mode, and when the wiper switch 2 recognizes that the wiper switch 2 is not in the intermittent mode, the inhibit signal is generated on the signal line 24.

When the wiper switch 2 is in a low speed mode or a high speed mode other than the intermittent mode, the prohibiting circuit 11 determines that the output of the IC 2 of the first input determining circuit 10a becomes high level and the first input determining circuit Since the output of IC3 of the circuit 10a becomes low level, the transistor Tr4 is turned on and gives a low level signal which is a prohibition signal to the quick charging circuit 12 via the signal line 24. The output of IC1 of the first input discrimination circuit 10a becomes high level even in the high speed mode.

When the wiper switch 2 is in a stop mode other than the intermittent mode, the prohibiting circuit 11 sets the output of the IC2 of the first input discriminating circuit 10a to a low level and the IC3 of the first input discriminating circuit 10a. Since the output becomes the high level, the transistor Tr4 is turned on and the inhibition signal (low level) is given to the quick charging circuit 12 through the signal line 24.

When the wiper switch 2 is in the intermittent mode, the prohibiting circuit 11 sets the output of IC2 of the first input discriminating circuit 10a to the low level and outputs the output of IC3 of the first input discriminating circuit 10a. Also, when the transistor Tr4 is turned to the low level, the transistor Tr4 is turned off and the high-level signal which is the quick charge release signal is given to the quick charge circuit 12 through the signal line 24.

The rapid charging circuit 12 connected to the inhibition circuit 11 includes a transistor Tr5, a transistor Tr5, a transistor Tr6, a resistor r28, a resistor r29, a resistor r30, a resistor r31, a resistor r32, and a resistor r33. , A diode D8, and a diode D9. The transistor Tr5 has a base connected to the power supply Vcc via the diode D8 and the resistor r30, a collector connected to the power supply Vcc, and an emitter provided to the intermittent timer circuit 13 described later. It is connected to the first capacitor C1 via a resistor r34. The base of the transistor Tr6, which is a grounded emitter, is grounded via the resistor r33, and is connected to the collector of the transistor Tr4 of the inhibition circuit 11 via the resistor r32, and the collector is connected to the base of the transistor Tr5. It is connected via r29.

In the rapid charging circuit 12, the base of the transistor Tr6 is connected to the collector of the transistor Tr4 of the inhibition circuit 11 via the resistor r32, so that the transistor Tr4 of the inhibition circuit 11 is turned on, that is, the wiper switch 2 is turned on. If it is recognized that is other than the intermittent mode and the low level prohibition signal is given, the transistor Tr6 is turned off, and the transistor Tr5 is turned on at the divided voltage level of the resistors r28 and r29. , The first capacitor C1 of the intermittent timer circuit 13 is rapidly charged to a level higher than the positive side input of IC5. Further, when the transistor Tr4 of the prohibition circuit 11 is off, that is, when the wiper switch 2 is recognized to be in the intermittent mode and a high level charge release signal is given, the transistor Tr6 is turned on. By turning off the transistor Tr5, the charging path of the first capacitor C1 of the intermittent timer circuit 13 is cut off.

The quick charging circuit 12 prepares for the first wiping of the wiper blade by charging the first capacitor C1 of the intermittent timer circuit 13 by the transistor Tr5.

The intermittent timer circuit 13 connected to the quick charging circuit 12 includes the first capacitor C1, IC5, transistor Tr8, Zener diode ZD2, resistor r24, resistor r25, resistor r26, resistor r27, resistor. The resistor r34, the resistor r35, the resistor r36, the resistor r37, the resistor r38, the diode D6, the diode D7, and the diode D12. The IC5 has a negative input connected to the first capacitor C1 via a resistor r35 and a resistor r34, and a positive input connected to the power supply Vcc via a resistor r31 and a resistor r30 of the quick charging circuit 12. The output is connected via a diode D10 and a resistor r12 to the base of a transistor Tr9 provided in a second output drive circuit 14b which will be described later, and also via a diode D10 and a diode D11. Is connected to the output of the IC 6 provided in the washer timer circuit 15.

The base of the transistor Tr8 is connected via a diode D6 to the collector of the transistor Tr9 of the second output drive circuit 14b, and also to the base of the transistor Tr2 provided in the second output drive circuit 14b via a resistor r16. In addition to being connected, they are connected to the voltage dividing point of the resistors r26 and r27 via the diode D7, the other end of the resistor r26 is connected to the power supply Vcc, and the collector is connected to the first It is connected to the capacitor C1 and has its emitter connected to the other end of the zener diode ZD2 whose one end is grounded to the other input terminal 3c via the resistor r8 and the resistor r8. As a result, the transistor Tr8 is driven by the constant voltage circuit, and the collector current is set by dividing the constant voltage. Therefore, the current value and the resistance value are inversely proportional to each other, and the other input terminal 3c is A charging path is formed for the first capacitor C1 via the variable resistor Vr2, the resistor r8, and the resistor r24 provided in the second switch portion 2b of the wiper switch 2. Since the current value and the resistance value are inversely proportional to each other, a linear level change can be obtained according to the dial operation of the wiper switch 2. The intermittent timer circuit 13 has a timer time T1 (shown in FIG. 4) for quick charging for the first wiping preparation of the wiper blade through the transistor Tr5 of the rapid charging circuit 12 and a pause time in the intermittent mode through the transistor Tr8. To set.

The IC5 of the intermittent timer circuit 13 has a plus side input which obtains a reference voltage by the resistors r31 + resistor r30 and the resistor r38 of the quick charging circuit 12, and the first capacitor by the rapid charging circuit 12. The negative side input is low level until the charge is stored in C1, and the positive side input is high level, so the output becomes high level, and when the first capacitor C1 is charged to an arbitrary potential, the positive side input On the other hand, the negative input is inverted and goes high, so the output goes low. When the output of IC5 becomes low level, the transistor Tr9 of the second output drive circuit 14b is turned on, and when the output of IC5 becomes high level, the transistor Tr9 is turned off.

Here, when the output of the IC5 becomes low level, the level of the reference voltage is slightly lowered. Therefore, when the first capacitor C1 is charged and then discharged, the IC5 is supplied through the resistor r37. Feedback is applied to the positive side input of.

The first output drive circuit 14a connected to the output of IC1 of the first input discriminating circuit 10a includes a transistor Tr1, a resistor r14, a resistor r15, a Zener diode ZD3, and a relay RL1, and has a grounded emitter. The base of the transistor Tr1 is connected to the output of the IC1 provided in the first input determination circuit 10a via the resistor r14, and the collector is connected to one end of the relay coil RL1-1 of the relay RL1. The other end of the relay coil RL1-1 is connected to the power supply VB. The normally closed fixed contact RL1-3 of the relay RL1 is connected to the low speed terminal 3g, the normally open fixed contact RL1-4 of the relay RL1 is connected to the high speed terminal 3h, and the movable contact RL1-2 of the relay RL1 will be described later. It is connected to the movable contact RL2-2 of the relay RL2 provided in the second output drive circuit 14b.

When the output of IC1 of the first input discriminating circuit 10a becomes high level, the first output drive circuit 14a turns on the transistor Tr1 and thus forms an energization path for the relay coil RL1-1 to output the output of IC1. Becomes low level, the energization path of the relay coil RL1-1 is cut off. When the energization path of the relay coil RL1-1 is formed, the movable contact RL1-2 is connected to the normally open fixed contact RL1-4.

The second output drive circuit 14b connected to the IC2 of the first input determination circuit 10a includes a transistor Tr2, a transistor Tr9, a resistor r11, a resistor r12, a resistor r16, a resistor r17, and a zener diode. A transistor Tr2, which is composed of a ZD4 and a relay RL2 and has a grounded emitter, has a base through a resistor r16 and a diode D4, an output of the IC2 provided in the first input determination circuit 10a, a resistor r16 and a diode D6, and an intermittent timer. It is connected to the base of the transistor Tr8 provided in the circuit 13, the collector is connected to one end of the relay coil RL2-1 of the relay RL2, and the other end of the relay coil RL2-1 is connected to the power supply VB. Has been. Transistor Tr9 has its power supply Vcc applied to its base via resistor r11 when the outputs of IC5 of intermittent timer circuit 13 and IC6 of washer timer circuit 15 are both at high level, and its emitter is connected to power supply Vcc and collector. Is connected to the base of the transistor Tr2 via a resistor r16. The normally closed fixed contact RL2-3 of the relay RL2 is connected to the stop position signal input terminal 3f, and the normally open fixed contact RL2-4 of the relay RL2 is normally connected to the relay RL3 provided in the third output drive circuit 14c described later. It is connected to the open fixed contact 3-4 and the ground terminal 3j.

The second output drive circuit 14b turns on the transistor Tr9 because the output of the IC2 of the first input determination circuit 10a is at a high level and the output of the IC5 of the intermittent timer circuit 13 is at a low level. When the output of the IC 6 provided in the timer circuit 15 is at a low level and the transistor Tr9 is in one of the ON states, the transistor Tr2 is turned on, so that the energizing path of the relay coil RL2-1 is formed. The transistor Tr9 is turned off when the output of IC2 of the first input determination circuit 10a is low level, the output of IC5 of the intermittent timer circuit 13 is high level, or the output of IC6 of the washer timer circuit 15 is high level. In this state, the transistor Tr2 is turned off, and the power supply path of the relay coil RL2-1 is cut off. It When the energization path of the relay coil RL2-1 is formed, the movable contact RL2-2 is connected to the normally open fixed contact RL2-4.

The washer timer circuit 15 connected to the second input determination circuit 10b includes an IC6, a second capacitor C2, a resistor r20, a resistor r21, a resistor r22, a resistor r23, a resistor r42, a diode D5. The positive side input of the IC6 divides the power supply Vcc by the resistors r22 and r23 to obtain the reference voltage. The negative input of the IC 6 is connected to the second capacitor C2 and is also connected to the cathode of the diode D5 via the resistor r21 and the resistor r20 for discharging the second capacitor C2. The output of the IC6 is connected to the base of the transistor Tr9 via the diode D11 and the resistor r12 of the second output drive circuit 14b. The output of IC6 becomes high level when the negative side input is low level and the positive side input is high level, and the output becomes low level when the negative side input is high level and the positive side input is low level.

In the washer timer circuit 15, when the output of IC4 of the second input determination circuit 10b becomes low level and the transistor Tr7 is turned on, charging of the second capacitor C2 is started through the resistor r21 and the second capacitor C2 is charged. The output of IC6 is high level because the minus side input of IC6 becomes lower level than the plus side input until the capacitor C2 of is charged to an arbitrary potential. When the capacitor C2 is charged to an arbitrary potential, the negative side input becomes high level compared to the positive side input, so the output becomes low level. When the output of IC6 becomes low level, the transistor Tr9 of the second output drive circuit 14b is turned on.

In the washer timer circuit 15, when the output of the IC4 of the second input determination circuit 10b becomes high level and the transistor Tr7 is turned off, the charging path of the second capacitor C2 is cut off, so that the second capacitor C2 Starts discharging through the resistor r21 and the resistor r20. When the discharge of the second capacitor C2 is started, the minus side input of IC6 is set to the high level corresponding to the discharge time. Therefore, by holding the output of IC6 at the low level for a predetermined time, the wiper post-wiping time T5 (Shown in FIG. 4) is set.

When the discharge of the second capacitor C2 ends after a predetermined time, the negative side input of the IC6 becomes a low level compared to the positive side input, so that the output of the IC6 becomes a high level and the second output drive The transistor Tr9 of the circuit 14b is turned off.

When the transistor Tr7 is turned on, the IC6 has the negative delay side input higher than the positive side input after an arbitrary time due to the charging of the second capacitor C2, and the on delay time and the output for setting the output low level. When the potential of the second capacitor C2 becomes lower than the lowered potential by lowering the positive-side input via the resistor r 42 to provide hysteresis due to the low level, the output is inverted. It causes an off delay.

The third output drive circuit 14c connected to the washer timer circuit 15 and the second input determination circuit 10b is composed of a transistor Tr3, a resistor r40, a resistor r41, a Zener diode ZD5, a relay RL3, and a grounded emitter. The base of the transistor T r3 is connected to the collector of the transistor Tr7 of the second input determination circuit 10b via the resistor r40 as described above, and the collector is connected to one end of the relay coil RL3-1 of the relay RL3. The other end of the relay coil RL3-1 is connected to the power supply VB. The movable contact RL3-2 of the relay RL3 is connected to the washer terminal 3e, the normally open fixed contact RL3-4 of the relay RL3 is connected to the ground terminal 3j, and the normally closed fixed contact RL3-3 of the relay RL3 is open. .

The third output drive circuit 14c turns on the transistor Tr3 of the second input determination circuit 10b to turn on the transistor Tr3 to form a conduction path of the relay coil RL3-1. When the transistor Tr7 of 10b is turned off, the conduction path of the relay coil RL3-1 is cut off.

The wiper control device 1 having such a structure operates based on the time chart shown in FIG.

In the stop mode in which the first switch portion 2a of the wiper switch 2 is not operated, the first voltage level (the lowest voltage level range) is applied to one input terminal 3b of the control mechanism 3. Since the voltage is applied, the output of IC1 becomes low level, the output of IC2 becomes low level, and the output of IC3 becomes high level in the first input discrimination circuit 10a.

Since the output of the IC 3 is at the high level, the transistor Tr 4 of the prohibiting circuit 11 is turned on, and the prohibiting circuit 11 gives a low-level prohibiting signal to the rapid charging circuit 12. The transistor Tr6 of the quick charging circuit 12 is turned off by the inhibition signal, and the transistor Tr5 is turned on by turning off the transistor Tr6. Therefore, the capacitor C1 is rapidly charged and is in a standby state for operation.

Therefore, when the wiper switch 2 is dial-operated at the position A in the intermittent mode for a long rest time, the second voltage level (the range of the second lowest voltage level) is applied to the one input terminal 3b of the control mechanism 3. Is applied to the other input terminal 3c of the control mechanism 3, a voltage level for setting the intermittent mode with a long down time (the range of the lowest voltage level) is applied. Output is low level, the output of IC2 is low level, the output of IC3 is low level, and the second input discrimination circuit 10b holds the output of IC4 at high level.

When the output of IC3 falls, the transistor Tr4 of the inhibition circuit 11 is turned off, the transistor Tr6 of the quick charging circuit 12 is turned on, and the rapid charging path from the transistor Tr5 to the first capacitor C1 is cut off. However, by turning off the transistor Tr4, the prohibition of the minus side input of IC5 is released, and the potential of the first capacitor C1 which has already been charged to a higher potential than the plus side input of IC5 passes through the resistors r34 and r35. Is applied to the negative side input of IC5, and the output of IC5 goes low. As a result, the transistor Tr9 is turned on, the transistor Tr2 is turned on, the relay coil RL2-1 is excited, and the wiper motor 4 starts rotating.

When the relay coil RL2-1 is excited, the movable contact RL2-2 of the relay RL2 is connected to the normally open fixed contact RL2-4, so that the low speed terminal 3g of the control mechanism 3 is connected to the ground terminal 3j. The wiper motor 4 is connected and the low speed terminal 4b is grounded. Since the low-speed terminal 4b is grounded to form a low-speed energization path in the wiper motor 4, the motor shaft 4e of the wiper motor 4 starts rotating at a low speed and is wiped by the wiper blade from the predetermined stop position to the upper reversal position. Start to wipe the wiping surface up to. The movable contact 4a1 of the fixed position stopping means 4a is connected to the grounded normally open fixed contact 4a3 by starting the wiper motor 4 and rotating it by a set angle.

When the first capacitor C1 of the intermittent timer circuit 13 is discharged and the negative input of IC5 becomes lower than the positive input, the output of IC5 is inverted and rises. When the output of IC5 rises, the transistor Tr9 of the second output drive circuit 14b is turned off, the transistor Tr2 is turned off, the relay coil RL2-1 of the relay RL2 is demagnetized, and the movable contact RL2-2 is normally turned on. The fixed contact RL2-3 is returned to the closed fixed contact RL2-3. At this time, the movable contact RL2-2 is connected to the stop position signal input terminal 3f by the return of the movable contact RL2-2 to the normally closed fixed contact RL2-3. Since the grounding circuit is formed at the low speed terminal 4b of the wiper motor 4 by the stop position signal input terminal 3f of the control mechanism 3, the wiper motor 4 continues to operate, and when the wiper blade reaches the predetermined stop position, When the movable contact 4a1 of the fixed position stopping means 4a is connected to the normally closed fixed contact 4a2 connected to the power source VB, the wiper motor 4 is electromagnetically braked and stopped. To do.

Further, by operating the dial of the wiper switch 2, a voltage level for setting the intermittent mode for a long rest time (the range of the lowest voltage level) is applied to the other input terminal 3 c of the control mechanism 3, and the intermittent timer is operated. The transistor Tr8 of the circuit 13 is turned off while the transistor Tr9 of the second output drive circuit 14b is on, and turned on while the transistor Tr9 is off, so that the other input terminal 3c of the control mechanism 3 is turned on. Supplies a charging current to the first capacitor C1 of the intermittent timer circuit 13. Since this charging current is supplied in a state in which the voltage level is set by dial operation of the wiper switch 2, the first capacitor C1 starts charging corresponding to the voltage level. The charging time of the first capacitor C1 becomes the pause time T1 in the intermittent mode.

When the first capacitor C1 is charged to an arbitrary potential, the minus side input of IC5 is set to a higher level than the plus side input, so that the output of IC5 is inverted to the low level, and Since the transistor Tr9 of the output drive circuit 14b is turned on and the transistor Tr2 is turned on by turning on the transistor Tr9, an energization path is formed in the relay coil RL2-1 of the relay RL2 to excite it, and the wiper motor is wiped in the same manner as the first wiping. An electric current path is formed in the low speed brush terminal 4b of 4 to rotate the motor shaft 4e of the wiper motor 4 at a low speed, and the wiper blade wipes the wiping surface between the predetermined stop position and the upper reversal position. When the transistor Tr9 of the second output drive circuit 14b is turned on, the transistor Tr8 of the intermittent timer circuit 13 is turned off, the transistor Tr8 is turned off, and at the same time, the first capacitor C1 starts discharging, so that the first capacitor The output of IC5 is kept at low level until C1 is discharged to an arbitrary potential, and when a predetermined time T2 elapses, the first capacitor C1 is discharged to an arbitrary potential and the output of IC5 is inverted. Until the wiper blade reaches the predetermined stop position in the same manner as above by turning off the transistor Tr9 of the second output drive circuit 14b and turning off the transistor Tr2 in the same manner as described above, the wiper motor is stopped by the wiper motor 4a. 4 is continued to operate, and the wiper motor 4 is stopped when the wiper blade reaches the predetermined stop position. While the wiper switch 2 is dialed in the intermittent mode, the above operation is repeated at the intermittent time T3 including the rest time T1 and the discharge time T2.

When the wiper switch 2 is pressed in the B position while the wiper switch 2 is dialed in the intermittent mode for a long down time, the second voltage level is applied to one input terminal 3b of the control mechanism 3. Since the cleaning mode voltage level (the highest voltage level) is applied to the other input terminal 3c of the control mechanism 3 while the (second lowest voltage level range) is being applied, In the input discrimination circuit 10a, the output of IC1 remains low level, the output of IC2 remains low level, the output of IC3 remains low level, and in the second input discrimination circuit 10b, the output of IC4 becomes low level.

When the output of the IC4 falls, the transistor Tr7 is turned on and the transistor Tr3 of the third output drive circuit 14c is turned on. Therefore, an energization path is formed in the relay coil RL3-1 of the relay RL3 to form the relay coil RL3. -1 is excited to connect the movable contact RL3-2 of the relay RL3 to the normally open fixed contact RL3-4.

When the movable contact RL3-2 of the relay RL3 is connected to the normally open fixed contact RL3-4, the washer terminal 3e is connected to the ground terminal 3j, so that the other brush terminal 5a of the washer pump 5 is connected to the ground circuit. Is formed and the washer pump 5 is started. When the washer pump 5 is operated, the cleaning liquid stored in the washer tank is sprayed from the nozzle toward the wiping surface.

When the transistor Tr7 of the second input determination circuit 10b is turned on, charging of the second capacitor C2 of the washer timer circuit 15 is started through the resistor r21. Until the second capacitor C2 is charged to an arbitrary potential, the negative input of IC6 is at a low level compared to the positive input, and when the second capacitor C2 is charged to an arbitrary potential, The negative side input of IC6 is inverted to a high level compared to the positive side input, so that the output of IC6 becomes low level.

When the output of IC6 becomes low level, the transistor Tr2 of the second output drive circuit 14b is turned on and the transistor Tr2 is turned on. Therefore, the relay coil RL2-1 of the relay RL2 is excited and the movable contact RL2 is excited. -2 is connected to the normally open fixed contact RL2-4 to form a low-speed energization path of the wiper motor 4, and the wiper motor 4 is operated at a low speed to move from the predetermined stop position to the upper reversal position by the wiper blade. Continuously wipe the wiping surface.

In this state, when the pressing operation of the wiper switch 2 is stopped at the C position and the dial is operated in the stop mode, the output of the IC4 of the second input determination circuit 10b is inverted to the high level, and the transistor Tr7 is turned off. Let When the transistor Tr7 is turned off, the transistor Tr3 of the third output drive circuit 14c is turned off to cut off the energization path of the relay coil RL3-1, so that the washer pump 5 is stopped.

When the transistor Tr7 of the second input discriminating circuit 10b is turned off at the position C, the second capacitor C2 of the washer timer circuit 15 cuts off the charging path, so that the resistor r21 and the resistor r20 are used. Start the discharge. At the moment when the second capacitor C2 starts discharging, the negative side input of IC6 is at a higher level than the positive side input, so that the output of IC6 is at a low level and the transistor of the second output drive circuit 14c is Tr9 is on.

When a predetermined timer time T4 elapses with the discharge of the second capacitor C2 and the minus side input of I C6 becomes lower level than the plus side input, the output of IC6 is inverted to the high level. Therefore, when the output of the IC6 rises, the transistor Tr9 of the second output drive circuit 14b is cut off and the transistor Tr2 is turned off. Therefore, the relay coil RL2-1 of the relay RL2 is demagnetized and the movable contact RL2- 2 is returned to the normally closed fixed contact RL2-3.

As a result, the wiper motor 4 is operated by the relay RL2 forming an energization path at the discharging time T4 of the second capacitor C2, and the wiper blade is reached by the fixed position stopping means 4a until the wiper blade reaches a predetermined stop position. The wiper blade continues to operate at T5 including the time after wiping by the blade, and when the wiper blade reaches the predetermined stop position, it is electromagnetically braked and stopped.

When the wiper switch 2 is dialed in the low speed mode at the D position, the third voltage level (the range of the third lowest voltage level) is applied to one input terminal 3b of the control mechanism 3. Therefore, in the first input discrimination circuit 10a, the output of IC1 is low level, the output of IC2 is high level, and the output of IC3 is low level.

When the output of the IC2 rises, the transistor Tr4 of the prohibition circuit 11 is turned on, so that the prohibition signal is transferred to the quick charging circuit 13. Since the transistor Tr2 of the second output drive circuit 14b is turned on by the rise of the output of IC2, the relay coil RL2-1 of the relay RL2 is excited and the movable contact RL2-2 is fixed to the normally open fixed contact RL2. By connecting it to -4, the energizing path of the low speed brush terminal 4b of the wiper motor 4 is formed, the wiper motor 4 is operated at a low speed, and the wiper blade cleans the wiping surface from the predetermined stop position to the upper reversal position. Wipe off continuously.

In this state, when the wiper switch 2 is dial-operated from the low speed mode to the high speed mode at the E position, the fourth voltage level (the highest voltage level range) is applied to one input terminal 3b of the control mechanism 3. Since they are applied, the output of IC 1 becomes high level, the output of IC 2 becomes high level, and the output of IC 3 becomes low level in the first input discrimination circuit 10 a.

Since the output of IC2 is still rising, the prohibition circuit 11 transfers the prohibition signal to the quick charging circuit 13, and the output of IC1 rises, so that the transistor Tr1 of the first output drive circuit 14a is turned on. By turning on and exciting the relay coil RL1-1 of the relay RL1 and connecting the movable contact RL1-2 to the normally open fixed contact RL1-4, a conduction path of the high speed brush terminal 4c of the wiper motor 4 is formed, The wiper motor 4 is operated at high speed, and the wiper blade continuously wipes the wiped surface from the predetermined stop position to the upper reversal position.

Then, when the wiper switch 2 is dial-operated from the high speed mode to the stop mode at the F position, the first voltage level (the lowest voltage level range) is applied to one input terminal 3b of the control mechanism 3. Therefore, in the first input discrimination circuit 10a, the output of IC1 is low level, the output of IC2 is low level, and the output of IC3 is high level. Since the output of the IC3 is at the high level, the prohibition circuit 11 transfers the prohibition signal to the quick charging circuit 12, the capacitor C1 of the intermittent timer circuit 13 is charged, and the operation standby state is restored.

[0069]

[Effect of device]

 As described above, in the wiper control device according to the present invention, only the signal of the predetermined voltage level generated by the wiper switch is transferred to the control mechanism, and the drive current of the wiper motor and the drive current of the washer motor flow to the control mechanism. Therefore, only the signal of the specified voltage level flows in the wiper switch, and neither the drive current of the wiper motor nor the drive current of the washer pump flows, so the wiring from the wiper switch to the control mechanism has only the signal of the specified voltage level. It is possible to use a small wire diameter for flowing the electric current, and to improve reliability by not causing an electromagnetic interference to other signal equipment as compared with the case where a connecting wire with a large wire diameter is drawn around. It has an excellent effect that it can.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of a wiper control device according to the present invention.

FIG. 2 is a block diaphragm of a control mechanism in the wiper control device shown in FIG.

FIG. 3 is a specific circuit diagram of a control mechanism in the wiper control device shown in FIG.

FIG. 4 is a timing chart for explaining the operation of the wiper control device shown in FIG.

[Explanation of symbols]

 1 wiper control device 2 wiper switch 3 control mechanism 4 wiper motor 5 washer pump

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Takao 1760 Higashimatano-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture

Claims (5)

[Scope of utility model registration request] 1. A stop mode, an intermittent mode, a low speed mode,
A wiper switch for setting a resistance value corresponding to the mode by switching between a high speed mode and a cleaning mode and a resistance value corresponding to a pause time arbitrarily set in the intermittent mode, and a wiper switch connected to the wiper switch. With a control mechanism for recognizing the resistance value corresponding to the mode of the wiper switch and supplying power to the wiper motor and the washer pump, the wiper motor driven by the power supply from the control mechanism is connected to the control mechanism, A wiper control device, wherein a washer pump driven by power supply from the control mechanism is connected to the control mechanism. 2. A stop mode, an intermittent mode, a low speed mode,
The wiper switch is provided with a wiper switch for setting a resistance value corresponding to the mode by switching between a high speed mode and a cleaning mode and a resistance value corresponding to an arbitrarily set down time in the intermittent mode. An input discriminating circuit connected to the discriminator for discriminating the mode by the voltage level of the resistance value of the wiper switch and generating an output signal of the discriminated mode, and the input discriminating circuit generating an output signal other than the intermittent mode, A prohibition circuit that generates a prohibition signal; a quick charging circuit that rapidly charges the first capacitor of the intermittent timer circuit for the first wipe of the wiper when the prohibition signal is generated from the prohibition circuit; When the battery is charged, the intermittent off time is determined by the charging time corresponding to the set down time of the wiper switch, and by the discharging time. Determine the intermittent on time,
An intermittent timer circuit including the first capacitor that transfers an output signal to a motor drive circuit; and an output signal that is transferred to a pump drive circuit when the input determination circuit is generating an output signal in a cleaning mode,
The wiper motor is driven by the output signal in the cleaning mode to drive the motor drive circuit by charging to an arbitrary potential, and the discharge delay after the output signal disappears gives an off delay to the motor drive circuit and the wiper motor in the cleaning mode. A washer timer circuit including a second capacitor for setting an on-delay time and a post-wiping time and transferring an output signal to a motor drive circuit; an output signal from the input determination circuit; an output signal from the first capacitor; The motor drive circuit that operates by any of the output signals from the second capacitor and the pump drive circuit that operates by the output signal of the cleaning mode from the input determination circuit are provided in a control mechanism, and the motor drive circuit operates. And a washer pump driven by the operation of the pump drive circuit. Wiper control apparatus according to claim 1, characterized in that connected to the mechanism. 3. A single signal line for transferring an inhibition signal to the intermittent timer circuit and a quick charge release signal to the rapid charging circuit is provided between the inhibition circuit and the rapid charging circuit and the intermittent timer circuit. Claims 1 and 2 characterized in that
The wiper control device according to any one of 1. 4. The intermittent timer circuit is provided with a constant voltage circuit for setting the charging current to the capacitor and the resistance value set by the wiper switch to a characteristic inversely proportional to each other. 3. The wiper control device according to any one of 3 above. 5. A plurality of timers are set by a single capacitor by providing a hysteresis in the setting of the output on-delay time and the off-delay time in the washer timer circuit. 4. The wiper control device according to any one of 4 above.