JPH06344869A - Wiper control device - Google Patents

Abstract

PURPOSE:To provide a wiper control device capable of finely controlling by switching the motion of a wiper motor to intermittent motion after allowing the wiper motor to continue the current motion at least once when a vehicle stops its running. CONSTITUTION:A wiper control device 1 is provided with a control means 6 which switches the mode of a wiper motor 2 to an intermittent motion mode after rotating it at least once when the vehicle which has been running stops, when a wiper switch 3 is in a low speed mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper control device used to wipe a wiped surface such as a windshield glass by operating a wiper motor, and more particularly to automatically operating the wiper motor according to the speed of the vehicle. The present invention relates to a wiper control device.

[0002]

2. Description of the Related Art Conventionally, as a wiper control device for automatically operating a wiper motor according to the speed of a vehicle, there is known a wiper control device disclosed in Japanese Patent Publication No. 63-44290.

In the wiper control device described in the above publication, when the vehicle is stopped or at a very low speed while the low speed mode is selected by the occupant during traveling, the vehicle speed signal from the vehicle speed sensor falls below a predetermined value. Therefore, the intermittent control circuit, which has been in the standby state by the intermittent setting circuit, immediately switches the low speed mode to the intermittent mode to drive the wiper intermittently.

[0004]

In the above-mentioned conventional wiper control device, when the vehicle speed signal from the vehicle speed sensor becomes a predetermined value or less in the low speed mode, the low speed mode is immediately switched to the intermittent mode. Therefore, for example, when the vehicle suddenly stops from the running state, the vehicle speed signal from the vehicle speed sensor becomes equal to or lower than a predetermined value according to the vehicle speed, and the low speed mode is automatically changed to the intermittent mode. It cannot be said that the switch does not switch, and the wiper automatically operates intermittently even if it is difficult to secure visibility because a large amount of rainwater flows from the roof of the suddenly stopped vehicle onto the windshield glass. Since the rainwater on the windshield glass cannot be quickly removed, there is a problem that it may give frustration to passengers. To solve has been a problem.

[0005]

SUMMARY OF THE INVENTION A wiper control device according to the present invention is capable of performing fine control by automatically driving a wiper motor according to the state of a vehicle even in a mode selected by an occupant. Is intended to provide.

[0006]

[Constitution of the invention]

[0007]

In the wiper control device according to the present invention, when the low speed mode is selected by the wiper switch, the control means tells the wiper motor that the traveling detection signal is output from the stop detection means. A current supply for continuous operation is supplied, and when a stop detection signal is output from the stop detection means, a current for supplying at least one rotation to the wiper motor is supplied and then switching to the intermittent operation is performed. In the embodiment adopted as needed, the logic circuit can switch the current supply for rotating the wiper motor at least once when the stop detection signal is output from the stop detection means.

[0008]

In the wiper control device according to the present invention, when the wiper switch is selected in the low speed mode and the stop detecting means recognizes that the vehicle is in the stopped state, the wiper motor is caused to rotate at least once. Is supplied, the switching to the intermittent operation is performed.
Therefore, when the vehicle suddenly stops from the running state, the wiper motor is not immediately intermittently operated, but the wiper motor wipes in the state where the low speed mode is maintained and then shifts to the intermittent operation.

[0009]

1 and 2 show an embodiment of a wiper control device according to the present invention. FIG. 1 is an overall circuit configuration diagram and FIG. 2 is a time chart for explaining the operation.

The illustrated wiper control device 1 mainly comprises
It comprises a wiper motor 2, a wiper switch 3, a vehicle speed sensor 4, and a control means 6 having a stop detection means 5.

In the wiper motor 2, the motor shaft 2a is connected to the wiper arm via a link (not shown), and the wiper arm is rotated between the lower reversal position (stop position) and the upper reversal position on the wiping surface by the rotational power of the motor shaft 2a. By swinging between them, the wiper blade attached to the wiper arm wipes the surface to be wiped back and forth. The wiper motor 2 is also provided with a fixed position stop mechanism 2b. The fixed position stop mechanism 2b is connected to the movable contact 2b which is switched and connected to the power source side fixed contact 2b2 and the earth side fixed contact 2b3 every rotation of the motor shaft 2a.
The movable contact 2b1 is connected to the power supply side fixed contact 2b2 when the wiper arm is in the lower reversal position, and is connected to the ground side fixed contact 2b3 when the wiper arm is not in the lower reversal position. In the fixed position stop mechanism 2b, the movable contact 2b1 is fixed to the earth side fixed contact until the wiper arm reaches the lower reversal position even if the supply of the current to the wiper motor 2 is interrupted by switching the wiper switch 3 to the stop mode. 2b3 continues to supply current to the wiper motor 2, and when the wiper arm reaches the lower reversal position, the movable contact 2b1 is connected to the fixed contact 2b2 on the power supply side to stop the motor shaft 2a by the armature short and stop the wiper arm. Is stopped at a predetermined lower reversal position.

The power supply brush terminal 2c of the wiper motor 2 includes a power supply 50, a power supply side fixed contact 2b2, and a control means 6.
Are connected to the power supply terminals 6a provided in each.
The low speed brush terminal 2d of the wiper motor 2 is connected to one motor terminal 6b of the control means 6, and the high speed brush terminal 2e of the wiper motor 2 is connected.
Is connected to the other motor terminal 6c provided in the control means 6. The movable contact 2b1 of the fixed position stopping mechanism 2b is connected to the position signal input terminal 6f provided in the control means 6.

The wiper switch 3 includes a mode setting section 3e having a movable contact 3a, an intermittent contact 3b, a low speed contact 3c and a high speed contact 3d, respectively, and an intermittent time setting section 3g having a variable resistor VR1. The intermittent contact 3b is connected to the intermittent terminal 6g provided in the control means 6, the low speed contact 3c is connected to the low speed terminal 6h provided in the control means 6, and the high speed contact 3d is provided in the control means 6. Connected to the high speed terminal 6i provided in the variable resistor VR1.
Has one end connected to the intermittent time setting terminal 6j provided in the control means 6 and the other end grounded. The movable contact 3a is rotated by an occupant in a rotary manner, so that the intermittent contact 3b and the low speed contact 3 are brought out of the stop mode.
Since the earth circuit is formed in each of the intermittent contact 3b, the low speed contact 3c, and the high speed contact 3d by being respectively connected to the high speed contact 3c and the high speed contact 3d, the intermittent mode, the low speed mode, and the high speed mode are set respectively. Further, since the resistance value of the intermittent time setting unit 3g is changed by an occupant's dial operation, the intermittent potential is changed by changing the collector potential of the second intermittent drive transistor TR7 provided in the control means 6 described later. The wiper pause time in the mode is set arbitrarily.

On the other hand, the vehicle speed sensor 4 is a reed switch interlocked with the wheels, one end of which is connected to the vehicle speed signal input terminal 6m provided in the control means 6 and the other end of which is grounded. The vehicle speed sensor 4 constantly generates a vehicle speed signal which is a pulse signal as the vehicle travels, and does not generate a vehicle speed signal when the vehicle stops.

On the other hand, the control means 6 includes a stop detection means 5 incorporating an output transistor TR13, a first intermittent drive transistor TR1, and a continuous drive transistor TR.
2, continuous operation prohibiting transistor TR3, first intermittent time setting transistor TR4, stop detecting transistor TR5, second intermittent time setting transistor TR6, second intermittent driving transistor TR7, third intermittent driving Transistor TR8, relay drive transistor TR
9, relay drive inhibition transistor TR10, discharge transistor TR11, discharge inhibition transistor TR1
2, relays RL1, RL2, capacitors C1, C2, comparator COM1, OR logic circuit OR1, resistor R
1, R2, R3, R4, R5, R6, R7, R8, R
9, R10, R11, R12, R13, R14, R1
5, R16, R17, R18, R19, R20, R2
1, R22, R23, R24, R25, R26, R2
7, R28, R29, R30, R31, R32, R3
3, R34, R35, diodes D1, D2, D3, D
4, D5, D6, D7, D8, Zener diode ZD1
Is provided. The power supply 50 is made a constant voltage by a resistor R1 and a zener diode ZD1.

The stop detecting means 5 is constructed so that the output transistor TR13 is turned off when there is a vehicle speed signal from the vehicle speed sensor 4 and is turned on when there is no vehicle speed signal from the vehicle speed sensor 4. In the off state of the output transistor TR13, the output becomes a high level which is a traveling detection signal, and the output transistor TR13
The output becomes the low level which is the stop detection signal in the ON state of. When the output becomes low level by turning on the output transistor TR13, the resistors R11 and R1
2 has a function of turning on the stop detection transistor TR5.

The comparator COM1 includes resistors R4 and R4.
The resistance value of the resistor R2 is divided by the resistance value of the variable resistor VR1 and the resistance value of the resistor R3 of the intermittent time setting unit 3g via the second intermittent drive transistor TR7 whose base current is set by 5. The reference voltage is set by applying the compressed potential to the positive side input via the resistor R33. This reference voltage fluctuates as the set resistance value of the variable resistor VR1 of the intermittent time setting unit 3g is changed by the operation of the occupant. Further, the comparator COM1 includes a third intermittent drive transistor TR.
Since the voltage set by the resistor R6, the resistor R7, and the resistor R8 is applied to the negative side input via the capacitor C2 and the resistor R34, the collector potential of the second intermittent drive transistor TR7 is Capacitor C
The output is inverted when the charge of 2 is exceeded. Here, the capacitor C2 is the second intermittent time setting transistor TR.
6, when the first intermittent time setting transistor TR4 is in the off state, the current flowing through the resistor R6, the resistor R7, and the resistor R8 becomes the charging current, and the second intermittent time setting transistor TR6 becomes In the on state and when the first intermittent time setting transistor TR4 is in the off state, the current flowing through the resistors R7 and R8 becomes a charging current, and the second intermittent time setting transistor TR6 and the first intermittent time setting transistor TR6. When all the time setting transistors TR4 are on, the current through the resistor R8 becomes the charging current. The discharging path of the capacitor C2 is formed via the resistor R35 and the diode D8 when the discharging transistor TR11 is in the on state.

In the OR logic circuit OR1, one input is connected via a resistor R6 to the collector of an output transistor TR13 provided in the stop detecting means 5, and the other input is connected upstream via a resistor R37. It is connected to the diode D2 and the resistor R13, and is connected downstream to the capacitor C1, the resistor R38 and the diode D3. here,
When the output transistor TR13 of the stop detection means 5 is in the off state, the output of the OR logic circuit OR1 becomes high level when one input is at high level and the other input is also at high level. The capacitor C1 is charged through the resistor R13 and the diode D2 without turning on the continuous operation inhibiting transistor TR3. In addition, when the discharging transistor TR11 is turned on during charging, a discharging path is formed through the resistor R38 and the diode D3 in the capacitor C1, but the charging current from the resistor R13 is discharged to the resistor R38. Since it is larger than the current, the output of the OR logic circuit OR1 is held at the high level. When the output transistor TR13 of the stop detecting means 5 is turned on, the one-side input becomes low level and the anode side of the diode D1 becomes low level, so that the charging path for the capacitor C1 is cut off and the discharging transistor TR1.
When 1 is turned on, the discharge starts via the resistor R38 and the diode D3, but due to the gradual discharge, the other input remains at the high level via the resistor R37, and the output becomes high level. After the holding, the output is inverted to the low level when the other side input becomes the low level due to the end of the discharge. The OR logic circuit OR1 has a function of continuing to turn off the continuous operation inhibiting transistor TR3 while the capacitor C1 is being discharged, and the continuous operating inhibiting transistor TR3 is turned off to turn on the continuous operating transistor TR2. Since the relay driving transistor TR9 is kept on, the relay RL1 is held in the on state. The discharge time of the capacitor C1 corresponds to the time required for the motor shaft 2a of the wiper motor 2 to make one rotation. Here, the discharge time of the capacitor C1 can be changed by arbitrarily setting the resistance value of the resistor R38 to rotate the motor shaft 2a of the wiper motor 2 a plurality of times.

The first intermittent driving transistor T whose base current is set by the resistors R23 and R21.
R1 is turned on when the output of the comparator COM1 is at low level to turn on the transistor TR9.

Continuous operation transistor TR2 whose base current is set by resistors R18 and R19.
Is turned on when the low speed mode is selected by connecting the movable contact 3a of the wiper switch 3 to the low speed contact 3c, and the continuous operation transistor TR2 is turned on so that the first intermittent drive transistor TR1 is turned on. Even if it is turned off, the relay driving transistor TR9 continues to be turned on.

A continuous operation inhibiting transistor TR whose base current is set by the resistors R16 and R17.
3 has a function of inhibiting the operation of the continuous drive transistor TR2, is turned on when the output of the OR logic circuit OR1 is at a low level, inhibits the operation of the continuous drive transistor TR2, and outputs the output of the OR logic circuit OR1. Becomes high level, it is turned off to allow the operation of the continuous drive transistor TR2.

In the first intermittent time setting transistor TR4 whose base current is set by the resistors R14 and R15, the movable contact 3a of the wiper switch 3 is connected to the low speed contact 3c like the continuous drive transistor TR2. Is turned on when the low speed mode is selected, and the transistor TR4 is turned on to form a charging path for the capacitor C2 via the single resistor R8.

Stop detection transistor TR5 whose base current is set by the resistors R11 and R12.
Is turned on when the output transistor TR13 of the stop detection means 5 is on, that is, when the stop detection signal is output.

The second intermittent time setting transistor TR6, whose base current is set by the resistors R9 and R10, selects the intermittent mode by connecting the movable contact 3a of the wiper switch 3 to the intermittent contact 3b. The second intermittent time setting transistor TR is turned on when
When turned on, 6 forms a charging path for the capacitor C2 via the two resistors R7 and R8.

A relay driving transistor TR9 whose base current is set by resistors R24 and R25.
Is turned on when the first intermittent drive transistor TR1 or the continuous drive transistor TR2 is turned on to turn on the relay RL.
1 energization path is formed.

A relay drive inhibition transistor T whose base current is set by resistors R27 and R28.
R10 is turned on when the wiper switch 3 is in the stop mode, and the collector is connected to the upstream side of the base of the relay driving transistor TR9 via the diode D4.
Is turned on, the relay drive transistor TR
9 has a prohibition function for not turning on.

The discharging transistor TR11 whose base current is set by the resistors R29 and R30 is
This is for forming a discharge path for the capacitors C1 and C2, and is normally in an on state, and is turned off by turning on the discharge inhibition transistor TR12 to stop the discharge of the capacitors C1 and C2.

A discharge inhibiting transistor TR12 whose base current is set by the resistors R31 and R32.
Is for switching the discharging transistor TR11, and is turned on every time the movable contact 2b1 of the fixed position stopping mechanism 2b is connected to the power supply side fixed contact 2b2, and is turned on to turn off the discharging transistor TR11.

The relays RL1 and RL2 are relay coils R
When L1-1 and RL2-1 are excited, the relay movable contacts RL1-2 and RL2-2 are closed normally fixed contacts RL1-3 and R.
Since it is switched from L2-3 to the normally open fixed contacts RL1-4 and RL2-4, it has a function of forming an energization path for the low speed operation and the high speed operation for the wiper motor 2. Relay RL
Since one relay coil RL1-1 is connected to the power supply side and the other is connected to the collector of the relay driving transistor TR9, one relay coil RL1-1 is excited by turning on the relay driving transistor TR9. Further, since the relay coil RL2-1 of the relay RL2 is connected to the high speed contact 3d of the wiper switch 3 via the high speed terminal 6i of the control means 6, the high speed contact 3d is excited by being grounded.

The wiper control device 1 having such a structure
Operates according to the time chart shown in FIG.

When the vehicle is traveling with the wiper switch 3 selected in the stop mode, the vehicle speed signal generated by the vehicle speed sensor 4 via the vehicle speed signal input terminal 6m of the control means 6 is detected by the stop detection means 5. The output transistor TR13 of the stop detecting means 5 is repeatedly turned on or off. The wiper motor 2 is immovable, and the fixed position stop mechanism 2b has the movable contact 2b2 and the fixed contact 2b on the power source side.
2 is connected to the discharge inhibiting transistor TR
12 is on, and the discharging transistor TR11 is off. Since the discharging transistor TR11 is in the off state, neither the capacitor C1 nor the capacitor C2 has a discharge path formed therein.
13, the capacitor C is charged through the diode D2
2 is charged via a resistor R6, a resistor R7, and a resistor R8. The output of the comparator COM1 is at high level.

In this state, when the occupant selects the intermittent mode, the wiper switch 3 is switched at point A and the movable contact 3a is connected to the intermittent contact 3b.
An earth circuit via a resistor R26 and a diode D6,
A ground circuit is formed via the resistors R9 and R10. The second intermittent time setting transistor TR6 is turned on by forming a ground circuit via the resistors R9 and R10, and the charging path for the capacitor C2 is formed from the resistors R7 and R8. The charging potential of C2 exceeds the reference voltage in a short time, and the output of the comparator COM1 becomes inverted low level.

Since the output of the comparator COM1 is inverted, the first intermittent time setting transistor TR1 is turned on and the relay driving transistor TR9 is turned on, so that the relay RL1 forms an energization path and thus the relay coil RL1-. 1 is excited to connect the relay movable contact RL1-2 to the normally open side fixed contact RL1-4, a current flows from the power supply brush terminal 2c of the wiper motor 2 to the low speed brush terminal 2d, and the motor shaft 2
Rotate a at low speed. Since the motor shaft 2a rotates at a low speed, the wiper arm reciprocates once between the lower reversal position and the upper reversal position, and wipes the wiping surface reciprocally with the wiper blade.

At the same time that the motor shaft 2a starts rotating, the movable contact 2b1 of the fixed position stop mechanism 2b is connected from the power source side fixed contact 2b2 to the earth side fixed contact 2b3, so that the discharge inhibition transistor TR12 is turned off and the discharge is stopped. Since the discharging transistor TR11 is turned on by turning off the inhibiting transistor TR12, the capacitor C2 is discharged by forming a discharging path via the resistor R35 and the diode D8. When the discharge potential of the capacitor C2 falls below the reference voltage of the comparator COM1, the comparator C
The output of OM1 is inverted from low level to high level.

When the output of the comparator COM1 is inverted to the high level, the first intermittent drive transistor TR1 is turned off, and the first intermittent drive transistor TR1.
When 1 is turned off, the relay driving transistor TR9 is also turned off and the relay RL1 is turned off. When the relay RL1 is turned off, the relay movable contacts RL1-2 are normally closed fixed contacts R.
Since it is connected to L1-2, current supply from the power supply brush terminal 2c of the wiper motor 2 to the low speed brush terminal 2d is stopped. At this time, when the wiper arm is not in the lower reversal position, the movable contact 2b1 of the fixed position stop mechanism 2b is connected to the earth side fixed contact 2b3, so that the earth circuit of the wiper motor 2 is formed, and the movable contact 2b1 is formed by the wiper arm. The motor shaft 2a continues to rotate because the ground circuit continues to be formed until it reaches the lower reversal position and is connected to the fixed contact 2b2 on the power source side.
When the wiper arm reaches a predetermined lower reversal position, the motor shaft 2a is stopped by the armature short circuit to stop the wiper arm.

The wiper arm stops at the lower reversal position, and the movable contact 2b1 of the fixed position stop mechanism 2b becomes the fixed contact 2 on the power source side.
When connected to b2, the discharge inhibition transistor TR12
Is turned on and the discharging transistor TR11 is turned off, so that the discharging path of the capacitor C2 is cut off, and the capacitor C2 is started to be charged in the charging path via the resistors R7 and R8. The capacitor C2 has a charging potential exceeding the reference voltage at a time corresponding to the wiper rest time, and the comparator C2
Since the output of OM1 becomes inverted low level, the first intermittent drive transistor TR1 is turned on and the relay drive transistor TR9 is turned on, so that the energization path of the relay RL1 is formed and the wiper arm is operated in the same manner as above. It reciprocates between the lower reversal position and the upper reversal position, and wipes the wiping surface with the wiper blade. While the vehicle is running and the wiper switch 3 is selected in the intermittent mode, the intermittent operation is repeated with the discharge time of the capacitor C2 as the wiper rest time. At this time, the OR logic circuit OR1
The capacitor C1 repeats discharging and charging by repeatedly turning on and off the discharging transistor TR11.
Since the charging current through the resistor R13 is larger than the discharging current through the resistor R38, the potential of the other side input is slightly lowered and is at the high level, so that the output is at the high level.

Therefore, when the low speed mode is selected by the occupant while the vehicle is traveling, the wiper switch 3 is switched at point B and the movable contact 3a is connected to the low speed contact 3c. An earth circuit via D7, an earth circuit via resistors R18 and R19, and an earth circuit via resistors R14 and R15 are respectively formed.

A relay drive inhibiting transistor TR1 is provided by a ground circuit via a resistor R26 and a diode D7.
0 is turned off, and the continuous driving transistor TR2 is turned on by the ground circuit via the resistors R18 and R19.
First by the earth circuit via the resistors R14, R15
The intermittent time setting transistor TR4 is turned on. When the relay drive inhibition transistor TR10 is turned off and the continuous drive transistor TR2 is turned on, the relay drive transistor TR9 is turned on and the relay RL is turned on.
At the same time when the first energization path is formed, the first intermittent time setting transistor TR4 is turned on to set the charging path for the capacitor C2 from the single resistor R8.

The relay RL1 is excited by the formation of an energization path and connects the movable contact RL1-2 to the normally open side fixed contact RL1-4. Therefore, the power supply brush terminal 2c of the wiper motor 2 to the low speed brush terminal 2d. An electric current flows toward the motor shaft 2a to continuously rotate the motor shaft 2a at a low speed. Since the motor shaft 2a rotates at a low speed, the wiper arm continuously swings back and forth between the lower reversal position and the upper reversal position to wipe the wiping surface with the wiper blade.

Since the vehicle speed signal is generated from the vehicle speed sensor 4, the stop detecting means 5 has the output transistor TR13 in the off state, and the OR logic circuit OR1 has one side input at the high level and the other side input as well. Since it is at the high level, the output is at the high level, and the continuous operation inhibiting transistor TR3 is not turned on.

By rotating the motor shaft 2a of the wiper motor 2, the movable contact 2b of the fixed position stopping mechanism 2b is rotated.
1 is a fixed contact 2 on the power source side for each revolution of the motor shaft 2a
Since the switch b2 is switched to the fixed contact 2b3 on the ground side, when the movable contact 2b1 is connected to the fixed contact 2b3 on the ground side, the discharge inhibition transistor TR12 is turned off and the discharge transistor TR11 is turned on, so that the capacitor C1 is turned on.
The capacitor C2 is discharged every one rotation of the motor shaft 2a, and is charged after the movable contact 2b1 is connected to the power source side fixed contact 2b2. While the motor shaft 2a is rotating, discharging and charging are repeated.

When the low speed mode is selected by the wiper switch 3 and the vehicle is suddenly stopped at the point C from the running state, the stop detection means 5 stops receiving the vehicle speed signal from the vehicle speed sensor 4, so that the output transistor TR13 is turned on. Since the stop detection transistor TR5 is turned on when the output transistor TR13 is turned on, the one side input of the OR logic circuit OR1 becomes low level. At this time, since a current flows through the output transistor TR13 via the resistor R13 and the diode D1, the capacitor C1
Is motivated by the rotation of the motor shaft 2a when charging is stopped and is gradually discharged every time the discharging transistor TR11 is turned on, and the other side input of the OR logic circuit OR1 is supplied while discharging to a predetermined potential. Becomes high level. As a result, in the OR logic circuit OR1, the one side input is at the low level and the other side input is at the high level, so that the output is at the high level and the continuous operation inhibiting transistor TR3 is not turned on.

Since the continuous operation inhibiting transistor TR3 is in the off state, the continuous action transistor TR2 is in the on state, whereby the relay driving transistor TR9 is kept on and the relay RL1 is kept on, and the wiper motor is turned on. Since 2 keeps the energization path and continuously rotates the motor shaft 2a at a low speed, the wiper arm continues to swing and wipes the wiping surface with the wiper blade.

While the wiper arm makes one reciprocation after the vehicle stops, the discharge potential of the capacitor C1 decreases and the other side input of the OR logic circuit OR1 is set to the low level at the point D, so that the OR logic circuit OR1 receives one side input. Is at a low level and the input on the other side is at a low level, and the output is at an inverted low level. By inverting the output of the OR logic circuit OR1, the continuous operation inhibiting transistor TR3
Is turned on, and the base current of the transistor TR2 for inhibiting continuous operation is cut off, so that the transistor TR2 for continuous driving is turned off. Therefore, the transistor T for relay driving is turned on.
R9 is turned off to cut off the energization path of the relay RL1.
In the relay RL1, the movable contact RL1-2 returns to the normally closed fixed contact RL1-3 by cutting the energization path,
The earth circuit of the wiper motor 2 is cut off, but when the wiper arm is not in the lower reversal position, the movable contact 2b1 of the fixed position stop mechanism 2b is connected to the earth side fixed contact 2b3 to form the earth circuit of the wiper motor 2. Since the movable contact 2b1 continues to form a ground circuit until the wiper arm reaches the lower reversal position after the position reciprocation and is connected to the power source side fixed contact 2b2, the motor shaft 2a continues to rotate and the wiper arm moves to a predetermined position. When the arm has reached the lower reversal position, the motor shaft 2a is stopped by the armature short and the wiper arm is stopped.

When the discharge of the capacitor C1 is completed, one input of the OR logic circuit OR1 is at the low level and the other input is at the low level, so that the output becomes the low level and the continuous operation inhibiting transistor TR3. To turn on the transistor TR2 is prohibited.

When the wiper arm reaches the lower reversal position, the discharge inhibiting transistor TR12 is turned on,
Since the discharging transistor TR11 is turned off, the discharging paths of the capacitors C1 and C2 are cut off and charging is performed. The capacitor C2 is started to be charged in the charging path via the resistors R7 and R8, and when the charging potential of the capacitor C2 exceeds the reference voltage at the time corresponding to the wiper rest time, the output of the comparator COM1 is inverted to a low level. Therefore, the first intermittent drive transistor TR1
Is turned on and the relay driving transistor TR9 is turned on, so that the energizing path of the relay RL1 is formed and the wiper arm reciprocates between the lower reversal position and the upper reversal position.
Wipe the wiping surface back and forth with a wiper blade. When the wiper arm reaches the lower reversal position and the movable contact 2b1 of the fixed position stop mechanism 2b is connected to the power supply side fixed contact 2b2, the discharge prohibiting transistor TR12 is turned on and the discharging transistor TR11 is turned off to thereby cause the capacitor C2. Since the discharge path is cut off and the battery is charged, the wiper is operated once after the vehicle is stopped, and then the operation is switched to the intermittent operation in which the discharge time of the capacitor C2 is the wiper rest time.

Then, the wiper switch 3 is switched by the occupant and the high speed mode is selected.
When the movable contact 3a is connected to the high-speed contact 3d at a point, an energization path is formed in the relay coil RL2-1 of the relay RL2, and the movable contact RL2-2 is a normally open fixed contact RL2.
Since the wiper motor 2 is connected to -4, current flows from the brush terminal 2c for power supply to the brush terminal 2e for high speed, so that the motor shaft 2a rotates at high speed and wipes the wiping surface continuously at high speed by the wiper blade. After that, even if the wiper switch 3 is selectively changed to the stop mode, the power supply path to the wiper motor 2 is maintained by the fixed position stop mechanism 2b until the wiper arm reaches a predetermined lower reversal position, and the wiper arm is moved to the lower reversal position. When it reaches, the wiper motor 2 is stopped due to the armature short.

[0048]

As described above, since the wiper control device according to the present invention has the above-mentioned configuration,
When the vehicle is stopped from running, the wiper motor does not operate intermittently immediately, and the mode is switched to intermittent operation after at least one operation, so it corresponds to the vehicle status even in the mode selected by the occupant. Then, by automatically driving the wiper motor, an excellent effect that fine control can be performed is achieved.

[Brief description of drawings]

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

FIG. 2 is a time chart for explaining the operation of the wiper control device shown in FIG.

[Explanation of symbols]

 1 wiper control device 2 wiper motor 3 wiper switch 4 vehicle speed sensor 5 stop detection means 6 control means

Claims (2)

[Claims] 1. A wiper motor for performing a wiper operation by supplying an electric current, a wiper switch arbitrarily selected from a stop mode, a low speed mode, a high speed mode or an intermittent mode by an occupant, and a vehicle speed signal according to an actual vehicle speed of the vehicle. When the vehicle speed sensor and the wiper switch are selected in the low speed mode, a stop detection signal is output by recognizing that the vehicle is in a stopped state based on the vehicle speed signal from the vehicle speed sensor, and Is provided with a stop detection means for outputting a travel detection signal by recognizing that it is in a traveling state, and the current supply to the wiper motor is continuously operated based on the travel detection signal and the stop detection signal from the stop detection means. A wiper control device having a control means for switching to intermittent operation. When the low speed mode is selected by the switch, if the stop detection means outputs the running detection signal, the wiper motor is supplied with current for continuous operation and the stop detection means outputs the stop detection signal. A wiper control device having a configuration for performing switching to intermittent operation after supplying a current for rotating the wiper motor at least once. 2. The wiper control device according to claim 1, wherein switching of current supply for rotating the wiper motor at least once when the stop detection signal is output from the stop detection means is performed by a logic circuit.