JPH1111259A - Wiper controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unwiped parts from being left, even if power supply voltage and load fluctuate, by reversing and actuating a wiper motor driving circuit by delaying the wiper motor driving circuit by delay time based on the time elapsed when a wiper blade reaches a fixed location within a wiping out range. SOLUTION: A wiper motor 2 performs actuating forward and backward revolutions for a driving circuit 3, reciprocatedly oscillates a wiper blade 13 in a prescribed section and a location detection means 4 detects a terminal location in the prescribed section. A time elapsed detection circuit 5 of a controller 7 detects the time elapsed when the wiper blade 13 moves in the prescribed section and obtains time elapsed data. A delay time generation circuit 6 performs an arithmetic processing based on time elapsed data obtained by the delay time detection circuit 5 and generates a delay time signal. By reversing and actuating the driving circuit 3 by delaying the circuit 3 by delay time, the reversing location of the wiper blade 13 is prevented from being changed, even if power supply 50 voltage and load for a wiping out surface of the wiper blade 13 fluctuate, and unwiped parts are prevented from being left.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wiper control device for wiping a wiper blade by operating a wiper motor, and more particularly to a wiper control device in which a wiper blade is directly connected to a wiper motor.

[0002]

2. Description of the Related Art A wiper control device for wiping a wiper blade by operating a wiper motor is disclosed in Japanese Utility Model Laid-Open No. 2-84759. In the wiper control device described in the above publication, when the wiper switch is turned on, the drive circuit supplies a current in the first direction to the wiper motor, which is a DC motor, so that the drive circuit is coupled to the armature shaft of the wiper motor. When the wiper blade is swung from one stop position to the other stop position and the wiper blade reaches the other stop position, the wiper position detection switch is switched, so that after the current supply to the wiper motor is cut off, the drive is stopped. In order for the circuit to reverse the current supply direction to the wiper motor in the second direction, the wiper blade reverses at the other stop position and swings toward one stop position. When the wiper blade reaches the first stop position, the wiper position detection switch is switched, so that
After the current supply to the wiper motor is cut off, the drive circuit reverses the current supply direction to the wiper motor in the first direction, so that the wiper blade reverses at one stop position and swings toward the other stop position. Operating control is performed.

[0003]

In the above-mentioned conventional wiper control device, when the wiper blade reaches one of the other stop positions, the brush terminals electrically connected to the armature of the wiper motor are short-circuited. Due to the electromagnetic braking force caused by this, the rotation of the armature is forcibly restrained and the wiper blade is stopped at one of the other stop positions, so that the voltage of the power supply applied to the wiper motor fluctuates. As a result, when the voltage level is low, the rotational speed of the armature is also low, and the inertia force of the armature is small, so that the wiper blade stops at the stop position, but on the contrary, the voltage level increases. The armature's rotation speed and the armature's inertia also increase, causing the wiper blade to stop. It is likely to overrun beyond the position. Therefore, usually, the maximum operating voltage of the power supply (1) is set so that the wiper blade does not contact the body component such as the windshield molding beyond the stop position on the wiping surface.
5V), the wiping range of the wiper position detection switch was selected to be small in anticipation of the overrun of the wiper blade. Thereby, when the wiper motor is operated in a state where the voltage level is lowered,
As described above, the inertia force of the armature is reduced, and the overrun does not occur on the windshield molding side as in the case of the maximum operating voltage, so that a predetermined stop position on the wiping surface and the windshield molding are provided. However, there is a problem that unwiping is left and obstructs the view.

Further, in the conventional wiper control device described above, a plurality of insulated contacts are used for the wiper position detection switch to set the wiping range and the storage position of the wiper blade. There is also a problem that the structure of the switch may be complicated.

[0005]

Even if the power supply voltage fluctuates or the load on the wiping surface of the wiper blade fluctuates, the position at which the wiper blade stops when the wiper blade is turned over is changed to prevent obstruction of the view due to the remaining wipe. It is another object of the present invention to provide a wiper control device capable of performing safe driving.

[0006]

Configuration of the Invention

[0007]

According to a first aspect of the present invention, there is provided a wiper control apparatus including: a wiper motor for reciprocatingly oscillating a wiper blade by supplying current from a power source; A drive circuit capable of supplying a current to the wiper motor, and an elapsed time detection circuit electrically connected to the drive circuit and detecting an elapsed time when the wiper blade moves within a predetermined range to obtain elapsed time data. A position detecting means for generating a detection signal when the wiper blade reaches a predetermined position within the wiping range, and a value of elapsed time data obtained by an elapsed time detecting circuit when a detection signal is generated by the position detecting means. And a control means for inverting the drive circuit by delaying the drive circuit with the delay time generated by the delay time generation circuit. It is characterized in that a configuration that includes.

In the wiper control device according to a second aspect of the present invention, the elapsed time detecting circuit detects an elapsed time when the wiper blade moves between two points of the first position and the second position. It is characterized by obtaining time data.

In the wiper control device according to a third aspect of the present invention, the position detection means includes a first wiper position detection switch for generating a second detection signal when the wiper blade reaches the second position. And a second wiper position detection switch for generating a first detection signal when the wiper blade reaches the first position.

[0010] In the wiper control device according to a fourth aspect of the present invention, the position detecting means is connected to an output shaft of the wiper motor and is rotatable with the output shaft. A single contact plate having a defined conduction range; and a contact plate electrically connected to the control means and electrically connectable to the contact plate, the contact being provided when the wiper blade reaches the second position. A first contactor cut off from the plate; and a first contactor electrically connected to the control means and electrically connected to the contact plate.
And a second contactor that is disconnected from the contact plate when the wiper blade reaches the first position.

In the wiper control device according to a fifth aspect of the present invention, the contact plate included in the position detecting means has a first conductive range forming portion disposed near the center of the rotary plate, and a first conductive range forming portion. The first contactor is electrically connected to the first conductive range forming portion outside the portion, and is concentric with the rotating plate, and can be electrically connected to the first contactor in a range slightly smaller than the wiping range of the wiper blade. A second conductive range forming portion formed outside the second conductive range forming portion and electrically connected to the second conductive range forming portion.
A configuration in which the second contactor is formed so as to be electrically connectable with the second contactor in a range slightly larger than the wiping range of the wiper blade coaxially with the rotating plate and integrally provided. It is characterized by having.

In a wiper control device according to a sixth aspect of the present invention, the contact plate of the position detecting means is electrically connected to the first conduction range forming portion or the second conduction range forming portion, There is provided a fourth conductive range forming portion extending coaxially with the rotary plate from the first conductive range forming portion or the second conductive range forming portion, and the position detecting means is configured to move the wiper blade to the storage position. By reaching, the first contactor or the second contactor
A third detection signal is generated when the signal is cut off from the conduction range forming section, and the control means outputs the third detection signal provided by the position detection means.
In which the drive circuit is stopped by the detection signal.

[0013]

In the wiper control device according to the first aspect of the present invention, when the wiper blade starts the wiping operation, the elapsed time when the wiper blade moves within the predetermined range is detected by the elapsed time detection circuit. The elapsed time data is obtained, and when the wiper blade reaches a predetermined position, the position detecting means generates a detection signal.Therefore, the control means sets the value of the elapsed time data obtained from the elapsed time detecting circuit to The drive circuit is delayed by the delay time generated by the delay time generation circuit based on the delay time and the inversion operation is performed.
Therefore, even if the power supply voltage fluctuates or the load on the wiping surface of the wiper blade fluctuates, if the current speed of the wiper blade moving within the predetermined range is high, the wiper blade may be over- By slightly delaying the timing of stopping the wiper motor in accordance with the run, if the current speed of the wiper blade is slow, the timing of stopping the wiper motor in response to the overrun of the wiper blade is increased. By delaying, the amount by which the wiper blade is overrun from the stop position is appropriately adjusted.

In the wiper control apparatus according to the second aspect of the present invention, when the wiper blade starts the wiping operation,
The elapsed time when the wiper blade moves between two points of the first position and the second position is detected by an elapsed time detection circuit to obtain elapsed time data, and the wiper blade is moved to the first position or the second position. When the position is reached, the position detection means generates a detection signal, and the control means controls the drive circuit with the delay time generated by the delay time generation circuit based on the value of the elapsed time data obtained from the elapsed time detection circuit. Reversing operation is delayed. Therefore, even if the power supply voltage fluctuates or the load on the wiping surface of the wiper blade fluctuates, if the current speed of the wiper blade that moves between the first position and the second position is high. However, the timing for stopping the wiper motor is slightly delayed in accordance with the overrun of the wiper blade. On the contrary, if the current speed of the wiper blade is slow, the wiper motor is delayed in accordance with the overrun of the wiper blade. By delaying the timing of stopping
The amount by which the wiper blade is overrun from the stop position is appropriately adjusted.

In the wiper control device according to a third aspect of the present invention, the control means is provided with a second detection signal generated by the first wiper position detection switch when the wiper blade reaches the second position. And delaying the inversion operation of the drive circuit by the delay time generated by the delay time generation circuit based on the value of the elapsed time data obtained from the elapsed time detection circuit, and the wiper blade arrives at the first position. When the first detection signal generated by the second wiper position detection switch is supplied, the drive circuit is inverted with the delay time generated by the delay time generation circuit based on the value of the elapsed time data obtained by the elapsed time detection circuit. Delay the timing. Therefore, even if the power supply voltage fluctuates or the load on the wiping surface of the wiper blade fluctuates, if the current speed of the wiper blade is high, the wiper motor is stopped according to the overrun of the wiper blade. If the current speed of the wiper blade is slow, on the other hand, if the current speed of the wiper blade is too slow, the timing to stop the wiper motor should be delayed slightly to allow for the overrun of the wiper blade slightly, and the wiper blade should be moved from the stop position. The overrun amount is appropriately adjusted.

In the wiper control apparatus according to a fourth aspect of the present invention, the control means includes: a first contactor is cut off from the contact plate when the wiper blade reaches the second position; When the wiper blade reaches the first position, the timing for inverting the drive circuit is delayed by the delay time generated by the delay time generation circuit based on the value of the elapsed time data obtained from the elapsed time detection circuit. When the second contactor is cut off from the contact plate and the first detection signal is supplied, the drive circuit is inverted with the delay time generated by the delay time generation circuit based on the value of the elapsed time data obtained from the elapsed time detection circuit. Operation is delayed. Therefore, even if the power supply voltage fluctuates or the load on the wiping surface of the wiper blade fluctuates, if the current speed of the wiper blade is high, the wiper motor is stopped according to the overrun of the wiper blade. If the current speed of the wiper blade is slow, the timing to stop the wiper motor is delayed too much in accordance with the overrun of the wiper blade, and the wiper blade is moved from the stop position. The run amount is appropriately adjusted, and the position of the wiper blade can be detected by a single contact plate, the first contactor, and the second contactor. Therefore, the position detecting means does not have a complicated structure. .

In the wiper control device according to a fifth aspect of the present invention, the control means includes: a first contactor is cut off from the second conduction range forming portion by the wiper blade reaching the second position; Is given, the timing for inverting the drive circuit is delayed by the delay time generated by the delay time generation circuit based on the value of the elapsed time data obtained from the elapsed time detection circuit, and the wiper blade is moved to the first position. , When the second contactor is cut off from the third conduction range forming section and the first detection signal is supplied, a delay time generation circuit is provided based on the value of the elapsed time data obtained from the elapsed time detection circuit. The timing of inverting the drive circuit is delayed by the generated delay time.
Therefore, even if the power supply voltage fluctuates or the load on the wiping surface of the wiper blade fluctuates, if the current speed of the wiper blade is high, the wiper motor is stopped according to the overrun of the wiper blade. If the current speed of the wiper blade is slow, the timing to stop the wiper motor is delayed too much in accordance with the overrun of the wiper blade, and the wiper blade is moved from the stop position. The run amount is appropriately adjusted, and when detecting the position of the wiper blade, a single conductive range forming unit, a second conductive range forming unit, and a third conductive range forming unit are integrally provided. Contact plate,
Since it can be performed at three points, the first contactor and the second contactor, the structure is not complicated.

In the wiper control device according to a sixth aspect of the present invention, the control means includes: a first contactor cut off from the second conduction range forming portion when the wiper blade reaches the second position; Is given, the timing for inverting the drive circuit is delayed by the delay time generated by the delay time generation circuit based on the value of the elapsed time data obtained from the elapsed time detection circuit, and the wiper blade is moved to the first position. , When the second contactor is cut off from the third conduction range forming section and the first detection signal is supplied, a delay time generation circuit is provided based on the value of the elapsed time data obtained from the elapsed time detection circuit. The timing of inverting the drive circuit is delayed by the generated delay time.
Then, when the wiper blade reaches the storage position, the control unit detects the third contact signal generated by the position detection unit when the first contactor or the second contactor is cut off from the fourth conduction range forming unit. Then, the drive circuit is stopped to stop the wiper blade at the storage position. Therefore, even if the power supply voltage fluctuates or the load on the wiping surface of the wiper blade fluctuates, if the current speed of the wiper blade is high, the wiper motor is stopped according to the overrun of the wiper blade. If the current speed of the wiper blade is slow, the timing to stop the wiper motor is delayed too much in accordance with the overrun of the wiper blade, and the wiper blade is moved from the stop position. The amount to be run is adjusted appropriately,
When detecting the position of the wiper blade, a single contact integrally including a first conductive range forming unit, a second conductive range forming unit, a third conductive range forming unit, and a fourth conductive range forming unit Since it can be performed at three points, the plate, the first contactor, and the second contactor, the structure is not complicated.

[0019]

1 to 12 show an embodiment of a wiper control device according to the present invention.

As shown in the block diagram of FIG. 1, the wiper control device 1 according to the present invention mainly includes a wiper motor 2, a drive circuit 3, a position detection means 4, an elapsed time detection circuit 5, and a delay time generation circuit 6. The control means 7 includes a wiper motor 2, a drive circuit 3, a position detecting means 4, and a microcomputer MCU1 (hereinafter referred to as a microcomputer MCU1) as a control means, as shown in a specific circuit diagram of FIG. Oscillating circuit 8, power supply circuit 9, reset circuit 10, ignition switch SW
1. A wiper continuous operation switch SW2, a washer switch SW3, and a wiper intermittent operation switch SW4 are provided. As shown in FIG. 2, the microcomputer MCU1 includes a counter 1 serving as an elapsed time detecting circuit 5, a timer 1 serving as a delay time generating circuit 6, a timer 2 for setting an inversion time, an input port, an output port, a central processing circuit CPU. The central processing circuit CPU includes a register group, a program counter P
C, a read / write memory RAM, an arithmetic logic circuit ALU, an instruction decoder, a call-only memory ROM, and a system control circuit.

As shown in FIG. 4, the wiper motor 2 has a yoke 2h rotatably housing an armature 2c.
Is screwed to the gear case 2e, and the armature shaft 2d provided for the armature 2c is
e, a worm 2i is formed, and a wheel gear 2g is meshed with the worm 2i at a one-step speed reduction. The wheel gear 2g is coupled to an output shaft 2f rotatably supported by a bearing 2e1 shown in FIG. 5 provided on the gear case 2e. The wheel gear 2g serves as a rotating plate 11 that constitutes a part of first and second wiper stop position detection switches RS1 and RS2 provided in the position detection unit 4 described later.

A first brush terminal 2a and a second brush terminal 2b shown in FIG. 3 are connected to the wiper motor 2 through a pair of brushes (not shown) arranged so as to be electrically connectable to a commutator 2j provided on the armature 2c. Are provided, and a portion of the output shaft 2f protruding from the gear case 2e is provided.
The wiper arm 12 outside the body panel (not shown).
Are connected. A wiper blade 13 is attached to a tip of the wiper arm 12. Wiper arm 1
2 is swung on the wiping surface between the first position B and the second position A on the back door glass (not shown), and is turned to the storage position C.

As shown in FIG. 3, the wiper motor 2 includes a first relay movable contact R which a first brush terminal 2a has in a first relay RL1 provided in a drive circuit 3 described later.
L1-3, and the second brush terminal 2b is connected to the second relay movable contact RL2-3 of the second relay RL2 provided in the drive circuit 3, so that the wiper arm 12 is in the first position. B, the first relay coil RL1-1 included in the first relay RL1 is excited and the second relay coil RL2-1 included in the second relay RL2 is demagnetized. From the first brush terminal 2a to the second brush terminal 2b, the current of the power supply 50 is supplied to the armature 2c in the positive direction, the output shaft 2f rotates forward, and the wiper arm 12 is moved from the first position B to the second position. To position A.

The wiper motor 2 is, contrary to the above,
When the wiper arm 12 is at the second position A, as shown in FIG. 3, the second relay coil RL2-1 included in the second relay RL2 is excited and the second relay coil RL2-1 included in the first relay RL1 is excited. When the first relay coil RL1-1 is demagnetized, the current of the power supply 50 is supplied from the second brush terminal 2b to the first brush terminal 2a in the opposite direction to the armature 2c, and the armature shaft 2d is turned off. Then, the wiper arm 12 swings from the second position A to the first position B in the reverse rotation.

The wiper motor 2 has a first relay coil RL1-1 of the first relay RL1 and a second relay coil RL2- of the second relay RL2.
1 are demagnetized, the first and second brush terminals 2
Since the current supply path to the power supply 50a and 2b is cut off and a short circuit between the first and second brush terminals 2a and 2b is formed, the armature 2c is suddenly stopped by the back electromotive force generated at that time.

Further, when the wiper arm 2 is at the first position B, the wiper motor 2
2 is energized, and the first relay coil RL1-1 included in the first relay RL1 is demagnetized, so that the first brush is connected to the second brush terminal 2b from the second brush terminal 2b. The current of the power supply 50 is supplied to the terminal 2a in the opposite direction to the armature 2c, and the armature shaft 2d rotates in the reverse direction, and the wiper arm 1
2 is rotated to a storage position C below the first position B. Then, when the wiper arm 12 reaches the storage position C, the first relay coil RL1-1 included in the first relay RL1 and the second relay coil RL1-1 included in the second relay RL2.
When the relay coil RL2-1 is demagnetized, the power supply path of the power supply 50 to the first and second brush terminals 2a and 2b is cut off, and the armature 2c is short-circuited by the back electromotive force generated at that time. Is formed and stops suddenly.

As shown in FIG. 3, the driving circuit 3
A first relay RL1 for forward rotation, a first transistor for forward rotation (NPN-type transistor) TR1, a second relay RL2 for reverse rotation, a second transistor for reverse rotation (NPN-type transistor) TR2, Zener diode Z
D1, ZD2 and resistors R2, R3, R4, R5 are provided.

The first relay RL1 includes a first relay coil RL1-1, a first relay normally open fixed contact RL1-2,
It has a first relay movable contact RL1-3, a first relay normally closed fixed contact RL1-4, and a second relay RL2,
RL2-1, a second relay normally open fixed contact RL2-2, a second relay movable contact RL2-3, and a second relay normally closed fixed contact RL2-4.

The first relay RL1 has one end of a first relay coil RL1-1 connected to an ignition switch SW1 (power supply line), and the other end of the first relay coil RL1-1 has a first end. The first relay normally open contact RL1-2 is connected to the ignition switch SW1 (power supply line), and the first relay movable contact RL1-3 is connected to the wiper motor 2 as described above. And the first relay normally closed contact RL1-4 is grounded.

The first transistor TR1 has a grounded emitter, a base connected to a forward rotation output port O1 provided in the microcomputer MCU1 described later through a resistor R2, and grounded through a resistor R4, between the collector and the emitter. The zener diode ZD1 is connected.

When the ignition switch SW1 is on, the first transistor TR1 is turned on by the microcomputer MC.
It turns on when an output signal (high level) is supplied from the forward rotation output port O1 provided in U1, and turns off when no output signal is supplied from the forward rotation output port O1.

When the first transistor TR1 is turned on while the ignition switch SW1 is in the on state, the first relay RL1 is excited by forming an energizing path in the first relay coil RL1-1. , The first relay movable contact RL1-3 is the first relay normally closed contact RL1.
-4, and electrically connected to the first relay normally open contact RL1-2.
When the first transistor TR1 is in an off state, the first relay coil RL1-1 is demagnetized and the first relay movable contact RL1 is turned off.
-3 is connected to the first relay normally closed contact RL1-4, so that the first brush terminal 2a of the wiper motor 2 is connected to ground.

The second relay RL2 has one end of a second relay coil RL2-1 connected to an ignition switch SW1 (power supply line) and the other end of the second relay coil RL2-1 connected to a second end. The second relay normally open contact RL2-2 is connected to the ignition switch SW1 (power supply line), and the second relay movable contact RL2-3 is connected to the wiper motor 2 as described above. The second relay normally closed contact RL2-4 is grounded.

The second transistor TR2 has a common emitter, and its base is connected to the microcomputer MCU through a resistor R3.
1, and is grounded through a resistor R5, and a zener diode ZD2 is connected between the collector and the emitter.

When the ignition switch SW1 is in the ON state, the second transistor TR2 causes the microcomputer MC
It turns on when an output signal (high level) is supplied from the reverse rotation output port O2 provided in U1, and turns off when no output signal is supplied from the reverse rotation output port O2.

When the second transistor TR2 is turned on while the ignition switch SW1 is in the on state, the second relay RL2 is energized by forming an energizing path in the second relay coil RL2-1. , The second relay movable contact RL2-3 is the second relay normally closed contact RL2.
-4, and electrically connected to the second relay normally open contact RL2-2.
When the second transistor TR2 is in the off state, the second relay coil RL2-1 is demagnetized and the second relay movable contact RL2
-3 is connected to the second relay normally closed contact RL2-4, so that the second brush terminal 2b of the wiper motor 2 is connected to ground.

As shown in FIG. 4, the position detecting means 4 comprises a first wiper position detecting switch RS1 and a second wiper position detecting switch RS2.

The first wiper position detection switch RS1 is
It is built in the wiper motor 2 together with a second wiper position detection switch RS2 described later.

The first wiper position detection switch RS1 is
A rotating plate (wheel gear) 11 made of an insulating material, which is coupled to an output shaft 2f of the wiper motor 2 and rotates by transmitting the rotational force of the armature shaft 2d;
It comprises a single contact plate 14 mounted on the rotating plate 11 and a first contactor 15 arranged on the contact plate 14 and electrically connectable to the contact plate 14. The contact plate 14 is connected to a second wiper position detection switch RS
Shared with 2.

The second wiper position detection switch RS2 is
Second contactor 1 arranged on contact plate 14 and electrically connectable to contact plate 14
6.

The contact plate 14 is formed of a conductive metal plate. As shown in FIG. 4, the contact plate 14 has a first conductive range forming portion 14a and a second conductive range forming portion 14a. A range forming portion 14b and a third
Are formed integrally with each other.

The first conduction range forming portion 14a is provided with the rotating plate 1
1 is arranged near the center and is formed in a substantially disk shape. Since the center of the first conduction range forming portion 14a is electrically connected to the output shaft 2f of the wiper motor 2, it is always connected to the ground through the output shaft 2f.

The second conduction range forming portion 14b is disposed outside the first conduction range forming portion 14a.
4 includes a first end portion 14b1 disposed at the right end in FIG. 4 and a second end portion 14b1 disposed at the left end in FIG.
The end 14b2 has an arc shape of approximately 150 degrees larger than the wiping range of the wiper blade 13, and is electrically connected to the first conduction range forming portion 14a.

The third conduction range forming portion 14c is disposed outside the second conduction range forming portion 14b.
4 includes a first end 14c1 disposed at the right end in FIG. 4 and a second end 14c1 disposed at the left end in FIG.
And the second end portion 14b2 of the second conduction range forming portion 14b and the third end portion 14c2 of the second conduction range forming portion 14b have an arc shape of approximately 150 degrees larger than the wiping range of the wiper blade 13. Between the first end portion 14c1 and the conduction region between the second conduction range forming portion 14b and the third conduction range forming portion 14c are each slightly smaller than the wiping range of the wiper blade 13 at 120 degrees. And electrically connected to the second conduction range forming portion 14b.

The first contactor 15 (RS1)
As shown in FIG. 5, the wiper blade 1 is disposed so as to be electrically connectable to the second conductive range forming portion 14b.
3, when the wiper arm 12 is at the first position B, the second end portion 14b2 of the second conduction range forming portion 14b
And the wiper arm 12 is electrically connected to the second conduction range forming portion 14b while leaving the first position B and reaching the second position A.

The first contactor 15 (RS1)
, A first position detection signal input port SB provided in the central processing unit MCU1 through a resistor R14 and a capacitor C6 connected to a power supply circuit 9 through a pull-up resistor R16 and forming a low-pass filter for removing high-frequency noise. It is connected to the.

The second contactor 16 (RS2)
As shown in FIG. 3, the wiper arm 12 is disposed on the third conductive range forming portion 14c, and when the wiper arm 12 is at the second position A corresponding to the wiper blade 13, the third conductive range forming portion 14c It is cut off from the first end 14c1, and is electrically connected to the third conduction range forming portion 14c while the wiper arm 12 reaches the first position B after leaving the second position A.

Further, the second contactor 16 (RS2)
While the wiper arm 12 at the first position B moves toward the storage position C on the side opposite to the first position B, the wiper arm 12 is electrically connected to the third conduction range forming portion 14c. When it reaches the storage position C, it is shut off from the second end 14c2 of the third conduction range forming part 14c.

The second contactor 16 (RS2)
, A second position detection signal input port SA provided in the central processing circuit MCU1 through a resistor R13 and a capacitor C5 connected to a power supply circuit 9 through a pull-up resistor R15 and forming a low-pass filter for removing high-frequency noise. It is connected to the.

The first wiper position detection switch RS1 is
When the wiper arm 12 is at the first position B, the first contactor 15 is separated from the second conduction range forming portion 14b and cut off, thereby generating a high-level (H) signal. A high level (H) is applied to the first position detection signal input port SB of the MCU1.

The second wiper position detection switch RS2 is
When the wiper arm 12 is at the first position B, the second contactor 16 is electrically connected to the third conduction range forming portion 14c to generate a low level (L) signal. A low level (L) is applied to the second position detection signal input port SA included in the circuit MCU1.

The first wiper position detection switch RS
1 is that when the wiper arm 12 reaches the second position A,
Since the first contactor 15 is electrically connected to the second conduction range forming portion 14b to generate a low level (L) signal, the first position detection signal input port included in the central processing unit MCU1 is generated. A low level (L) is given to SB.

Then, the second wiper position detection switch R
S2, when the wiper arm 12 reaches the second position A, the second contactor 16 moves to the third conduction range forming portion 14
Since the signal deviates from c to generate a high-level (H) signal, a high-level (H) is applied to the second position detection signal input port SA included in the central processing unit MCU1.

When the wiper arm 12 reaches the storage position C, the first wiper position detection switch RS1 switches the first contactor 15 to the second conduction range forming section 14.
b to generate a high-level (H) signal by being cut off while deviating from the central processing circuit MCU1.
Is given a high level (H) to the first position detection signal input port SB.

Further, when the wiper arm 12 reaches the storage position C, the second contactor 16 switches the second wiper position detection switch RS2 to the third conduction range forming section 1.
Since the signal is deviated from 4c to generate a high-level (H) signal, a high-level (H) is applied to the second position detection signal input port SA included in the central processing unit MCU1.

First and second wiper position detection switches RS
1, RS2 is composed of three points of a contact plate 14, a first contactor 15, and a second contactor 16, and since the contact plate 14 is composed of a single member, it is more complicated than the conventional one. It does not become a structure.

On the other hand, as shown in FIG. 3, one of the ignition switches SW1 is connected to the power supply 50, and the other is connected to the first relay RL1.
Relay coil RL1-1 of the second relay RL2
RL2-1, the anode of the diode D1 provided in the power supply circuit 9, one of the wiper continuous operation switches SW2, one of the washer switches SW3, and one of the wiper intermittent operation switches SW4.

As shown in FIG. 3, the power supply circuit 9
A diode D1, a resistor R1, a power supply capacitor C1,
A zener diode ZD3 is provided, and the power supply circuit 9 keeps the power supply voltage stable when current consumption in the circuit fluctuates transiently. The power supply circuit 9 is connected to the reset circuit 10.

As shown in FIG. 3, the reset circuit 10 includes a diode D2, a capacitor C2, and a resistor 6, and is connected to a reset port RES provided in the microcomputer MCU1. The reset circuit 10 determines a reset timing (reset time) by a combination of the capacitor C2 and the resistor R6, and sets the reset port RES to low level (L) for a predetermined time after the power supply of the microcomputer MCU1 reaches the operation range. , The microcomputer MCU1 is initialized (initial setting).

As shown in FIG. 3, the wiper continuous operation switch SW2 has a resistor R for pulling down the switch input.
7 and a resistor R10 and a capacitor C7 forming a low-pass filter for removing high-frequency noise are connected to a wiper continuous operation input port S1 provided in the microcomputer MCU1. When the ignition switch SW1 is on, the wiper continuous operation switch SW2 gives a high level (H) to the wiper continuous operation input port S1 provided in the microcomputer MCU1, and is turned off. Then, a low level (L) is given to the wiper continuous operation input port S1 provided in the microcomputer MCU1.

As shown in FIG. 3, the washer switch SW3 is provided with a pull-down resistor R8 for switch input.
And a microcomputer MC through a resistor R11 and a capacitor C8 forming a low-pass filter for removing high-frequency noise.
It is connected to a washer input port S2 provided for U1. The washer switch SW3 gives a high level (H) to a washer input port S2 provided in the microcomputer MCU1 when the ignition switch SW1 is turned on while the ignition switch SW1 is in an on state. A low level (L) is applied to the washer input port S2 provided in the MCU1.

As shown in FIG. 3, the wiper intermittent operation switch SW4 is provided with a resistor R for pulling down the switch input.
9 and a resistor R12 and a capacitor C9 forming a low-pass filter for removing high-frequency noise are connected to a wiper intermittent operation input port S3 provided in the microcomputer MCU1. The wiper intermittent operation switch SW4 gives a high level (H) to the wiper intermittent operation input port S3 provided in the microcomputer MCU1 when the ignition switch SW1 is turned on while the ignition switch SW1 is in the on state, and is turned off. Then, a low level (L) is given to the wiper intermittent operation input port S3 provided in the microcomputer MCU1.

As shown in FIG. 3, the oscillation circuit 8 comprises a ceramic oscillator RZ1, a bias resistor R17, a capacitor C3, a capacitor C4, and an oscillation inverter circuit (not shown) built in the microcomputer MCU1. The oscillation frequency of the ceramic vibrator RZ1 is determined by the combination of the capacitors C3 and C4. One end of the resistor R17, one end of the ceramic vibrator RZ1, and one end of the capacitor C4 are connected to a first oscillation port OSC1 provided in the microcomputer MCU1.
7, the other end of the ceramic vibrator RZ1, and one end of the capacitor C3 are connected to a second oscillation port OSC2 provided in the microcomputer MCU1.

The oscillation circuit 8 is turned on when a high level (H) is applied to the power supply current input port B, and the first
When the second wiper position detection switch RS1 generates a second detection signal and when the second wiper position detection switch RS2
Generates the first detection signal, generates an inverted output signal in the microcomputer MCU1.

On the other hand, as shown in FIG. 3, the microcomputer MCU1 has the above-described forward rotation output port O1, reverse rotation output port O2, and first position detection signal input port S.
B, second position detection signal input port SA, reset port RES, wiper continuous operation input port S1, washer input port S2, wiper intermittent operation input port S3, first
In addition to the oscillation port OSC1 and the second oscillation port OSC2, the power supply circuit 9 includes a power supply current input port B connected to a power supply line and a grounded ground port E.

The elapsed time detecting circuit (counter 1) (see FIG. 1) 5 measures the number of rotations of the output shaft 2f of the wiper arm 2 when the wiper arm 12 moves in a predetermined section. When the wiper arm 12 rotates from the second position A to the first position B in a state where a high level (H) is given to the operation input port S1, the first position detection signal input port SB is From the time when the applied low level (L) as the first detection signal is switched to the high level (H), the second position detection signal input port SA is supplied with the high level (H) as the second detection signal. Is given to obtain elapsed time data T.

The elapsed time detecting circuit 5 rotates the wiper arm 12 from the first position B to the second position A when the high level (H) is applied to the wiper continuous operation input port S1. When the first position detection signal is input, the low level (L), which is the second detection signal applied to the second position detection signal input port SA, is switched to the high level (H). The elapsed time until the low level (L) as the first detection signal is applied to the port SB is detected to obtain elapsed time data T.

The elapsed time data T obtained by the elapsed time detection circuit 5 coincides with the speed of the wiper arm 12 when the wiper arm 12 rotates from the second position A to the first position B, Elapsed time data T obtained by the elapsed time detection circuit 5 and corresponding to the speed at the time of rotation from the first position B to the second position A is transferred to the delay time generation circuit 6.

The delay time generation circuit (timer 1) (see FIG. 1) 6 generates a delay time signal t by performing arithmetic processing based on the elapsed time data T obtained by the elapsed time detection circuit 5. When the wiper arm 12 rotates from the first position B to the second position A in a state where the high level (H) is given to the wiper continuous operation input port S1, the second position is detected. After the high level (H), which is the first detection signal applied to the signal input port SA, is switched to the low level (L),
Until a high level (H), which is the second detection signal, is applied to the position detection signal input port SB of FIG. generates t.

The delay time generating circuit 6 turns the wiper arm 12 from the second position A to the first position B when the high level (H) is applied to the wiper continuous operation input port S1. When moving, the second position detection signal input from the high level (H) which is the second detection signal applied to the first position detection signal input port SB is switched to the low level (L). Until the high level (H) as the first detection signal is applied to the port SA, the delay time signal t is generated by processing based on the elapsed time data T obtained from the elapsed time detection circuit 5.

At this time, the delay time generating circuit 6 sets the operating time of the output shaft 2f of the wiper motor 2 to X, and sets the operating time X of the output shaft 2f of the wiper motor 2 (the time T shown in FIG.
1, which corresponds to time T2. ) Is converted to a delay time by a, and a constant for giving a characteristic in which the timer time is offset from the operation time X of the output shaft 2f of the wiper motor 2 is b, and t = aX−b. can get.

Since the delay time signal t generated by the delay time generation circuit 6 is obtained as having a delay time t corresponding to the rotation speed of the output shaft 2f to which the wiper arm 12 is coupled in the wiper motor 2, FIG. As shown in
When the rotation speed of the output shaft 2f of the wiper motor 2 is steady, the elapsed time detection circuit 5 outputs the steady time elapsed time data T
2 having a normal delay time t2. On the other hand, when the rotation speed of the output shaft 2f of the wiper motor 2 is lower than the steady state, the elapsed time detection circuit 5 obtains the elapsed time data T3 shorter than the steady state value, and the delay time that is longer than the steady state. On the other hand, if the rotation speed of the output shaft 2f of the wiper motor 2 is higher than the steady state, the elapsed time detection circuit 5 obtains the elapsed time data T longer than the steady value, and the elapsed time data T is shorter than the steady state. It has a certain delay time t1.

In the wiper control device 1 having the above configuration, the microcomputer MCU1 executes a control operation based on the flowcharts shown in FIGS.

When the wiper is not in use, the wiper arm 12 is in the storage position C and the ignition switch SW1
Is turned on and the wiper continuous operation switch SW2 is not turned on, the current of the power supply 50 is supplied through the power supply circuit 9 and the reset circuit 1
Initialization is performed by 0, input of the wiper continuous operation input port S1 is performed in step 101, and the level of the wiper continuous operation input port S1 is determined in step 102. At this time, since the wiper continuous operation switch SW2 is not turned on, steps 101 and 102 are repeated.

At time A shown in FIG. 6, when the ignition switch SW1 is turned on and the wiper continuous operation switch SW2 is turned on, the process proceeds to step 103 according to the determination in step 102, and the first position is detected in step 103. The input of the signal input port SB and the second position detection signal input port SA is performed.
At 04, the level of the first position detection signal input port SB and the level of the second position detection signal input port SA are determined.

At this time, the wiper arm 12 is
, The first position detection signal input port SB is at a high level (H), and the second position detection signal input port SA is at a high level (H). In step 105, the forward rotation output port O1 goes high, the reverse rotation output port O2 goes low, and the forward rotation output port O1 goes high. Transistor TR1 is turned on,
Since the first relay coil RL1-1 of the first relay RL1 is excited, the first brush terminal 2 of the wiper motor 2
The current of the power supply 50 is supplied in the forward direction from the direction a to the second brush terminal 2b, and the output shaft 2f starts rotating forward.

When the output shaft 2f of the wiper motor 2 starts to rotate forward, the wiper arm 12 moves from the storage position C to the first position B, and the first position detection signal input port S
B, the second position detection signal input port SA is fetched, and the level of the first position detection signal input port SB and the level of the second position detection signal input port SA are determined in step 107 after step 106. Therefore, steps 107 and 106 are repeated until the wiper arm 12 passes the first position B at a time A shown in FIG. 6 until the wiper arm 12 passes the first position B. The detection signal input port SB is low level (L) and the second position detection signal input port SA
Becomes low level (L), and the process proceeds from step 107 to step 108. In step 108, the counter 1 starts, and the process proceeds to step 109.

Step 10 shifted from step 108
At 9, the first position detection signal input port SB and the second position detection signal input port SA are taken in. At step 110 after step 109, the level of the first position detection signal input port SB and the second Since the level determination of the position detection signal input port SA is performed, steps 110 and 109 are repeated while the wiper arm 12 is between the first position B and the second position A, and at time c shown in FIG. , The wiper arm 12 is the second
When the position A is reached, steps 110 to 1
Move to 11.

When the wiper arm 12 reaches the second position A, the counter 1 is stopped at the step 111 after the step 109, the counter 1 is read, and the elapsed time data T is stored in the read / write memory RAM. Then, the counter 1 is reset, and the process proceeds to step 112. A delay time signal t is calculated based on the elapsed time data T obtained from the counter 1 in step 112 after step 111. At this time, if the calculation result becomes a negative value, the delay time signal t is set to 0, and the process proceeds to step 113.

Step 11 shifted from step 112
At 3, the timer 1 is set to t, the timer 1 starts, and the routine proceeds to step 114. Timer 1 operates during delay time signal t.

Step 11 shifted from step 113
In steps 4 and 115, the time until the timer 1 times out is measured. During that time, the forward rotation output port O1 holds the high level (H), and the process proceeds to step 116.

During this time, the wiper motor 2 keeps the wiper arm 12 at the storage position C passing through the first position B to reach the second position A. Since the output shaft 2f continues to rotate forward until the time is up, the output shaft 2f does not stop at the same time when the wiper arm 12 reaches the second position A.

At time d shown in FIG.
As a result, the generation of the delay time signal t disappears, so that the forward rotation output port O1 is changed from high level (H) to low level (L) in step 116.
And the process proceeds to step 117.

When the timer 1 times out, the output shaft 2f of the wiper motor 2 stops rotating, so that the wiper arm 12 stops at a position slightly past the second position A.

At this time, when the rotation speed of the output shaft 2f of the wiper motor 2 is steady, the timer 1 is given a normal timer time (delay time t2) because the counter 1 obtains the elapsed time data T2 of a steady value. When the rotation speed of the output shaft 2f of the wiper motor 2 is lower than the steady state, the counter 1 obtains the elapsed time data T3 shorter than the steady state value. When t3) is given and the rotation speed of the output shaft 2f of the wiper motor 2 is higher than the steady state, the timer 1 is shorter than the steady state because the counter 1 obtains the elapsed time data T longer than the steady state value. The time (delay time t1) is given.

That is, if the elapsed time from the first position B to the second position A of the wiper arm 12 is short, the speed of the wiper arm 12 is high. Time d shown in 6)
On the contrary, the first position B of the wiper arm 12
If the elapsed time from the second position A to the second position A is long, the speed of the wiper arm 12 is slow, so that the amount of overrun from the second position A is increased for a longer time (time t shown in FIG. 6).
Then, the amount of overrun of the wiper arm 12 is adjusted based on the current speed of the wiper arm 12 so that no wiping remains on the second position A side of the wiping surface.

Step 11 shifted from step 116
7, the stop time until the timer 2 times out is measured in the steps 118 and 119 after the step 117. When the timer 2 times out at the time e shown in FIG. It moves to 120.

Step 12 shifted from step 119
At 0, the reverse rotation output port O2 goes high, the forward rotation output port O1 goes low, and the reverse rotation output port O2 goes high.
Transistor TR2 is turned on, and the second relay coil RL2-1 of the second relay RL2 is excited, so that the current of the power supply 50 from the second brush terminal 2b of the wiper motor 2 to the first brush terminal 2a Are supplied in the reverse direction, and the output shaft 2f starts reverse rotation.

When the output shaft 2f of the wiper motor 2 starts reverse rotation, the wiper arm 12 stopped at a position slightly after the second position A starts rotating toward the first position B, In step 121 after step 120, the first position detection signal input port SB,
The input of the second position detection signal input port SA is performed,
In step 122 after step 121, the level of the first position detection signal input port SB and the level of the second position detection signal input port SA are determined.

At this time, until the wiper arm 12 passes through the second position A, the first position detection signal input port S
Since B is at a high level (H) and the second position detection signal input port SA is at a low level (L), Step 122,
Step 121 is repeated, and at time t shown in FIG.
From the position B, the first position detection signal input port SB becomes low level (L) and the second position detection signal input port SA becomes low level (L).
From 22, the process proceeds to step 123, where the counter 1 starts again, and proceeds to step 124.

Step 12 shifted from step 123
In 4, the first position detection signal input port SB and the second position detection signal input port SA are taken in. In Step 125, which has been shifted from Step 124, the level of the first position detection signal input port SB, The level of the position detection signal input port SA is determined.

At this time, while the wiper arm 12 is between the second position A and the first position B, the first position detection signal input port SB is at the low level (L) and the second position detection signal input port SB is at the low level (L). Since the port SA becomes low level (L),
Steps 125 and 126 are repeated, and when the wiper arm 12 reaches the first position B at the time shown in FIG. 6, the first position detection signal input port SB goes high (H) and the second position detection Signal input port SA
Goes to the low level (L), so that the routine proceeds to step 126.

Step 12 shifted from step 125
6, the counter 1 is stopped, the counter 1 is read, and the elapsed time data T is stored in the read / write memory RA.
M, counter 1 is reset, and step 1
Move to 27. A delay time signal t is calculated and calculated based on the elapsed time data T obtained from the counter 1 in a step 127 shifted from the step 126. At this time, if the operation result becomes a negative value, the delay time signal t is set to 0, and the process proceeds to step 128.

Step 12 shifted from step 127
At 8, the timer 1 is set to t, the timer 1 starts, and the routine goes to step 129. Timer 1 operates during delay time signal t.

Step 12 shifted from step 128
In step 9 and step 130, the time until the timer 1 times out is measured, and during that time, the reverse rotation output port O2 holds the high level (H).

During this time, the wiper motor 2 is in the second position A
The output shaft 2f continues to rotate in the reverse direction until the timer 1 times out after the wiper arm 12 reaches the first position B and passes through the first position B. It does not stop upon reaching position B.

At time t shown in FIG.
, The occurrence of the delay time signal t disappears, and in step 131, the reverse rotation output port O2 changes from high level (H) to low level (L).
And the process proceeds to step 132.

When the timer 1 times out, the output shaft 2f of the wiper motor 2 stops rotating, so that the wiper arm 12 stops at a position slightly past the first position B.

At this time, if the rotation speed of the output shaft 2f of the wiper motor 2 is steady, the timer 1 is given a normal timer time (delay time t2) because the counter 1 obtains the elapsed time data T2 of a steady value. When the rotation speed of the output shaft 2f of the wiper motor 2 is lower than the steady state, the counter 1 obtains the elapsed time data T3 shorter than the steady state value. When t3) is given and the rotation speed of the output shaft 2f of the wiper motor 2 is higher than the steady state, the timer 1 is shorter than the steady state because the counter 1 obtains the elapsed time data T longer than the steady state value. The time (delay time t1) is given.

That is, if the elapsed time from the second position A of the wiper arm 12 to the first position B is short, the speed of the wiper arm 12 is high, and the amount of overrun from the first position B is reduced for a short time (see FIG. Time d shown in 6)
On the other hand, the second position A of the wiper arm 12
If the elapsed time from the first position B to the first position B is long, the speed of the wiper arm 12 is low, so that the amount of overrun from the first position B is set to a longer time (time t shown in FIG. 6).
The amount of overrun of the wiper arm 12 is adjusted based on the current speed of the wiper arm 12 so that no wiping remains on the first position B side of the wiping surface.

Step 13 shifted from step 131
In step 2, the timer 2 is started, and in steps 133 and 134 after step 132, the stop time until the timer 2 times out is measured. When the timer 2 times out, the process proceeds to step 135.

Step 13 shifted from step 134
At 5, the input of the wiper continuous operation input port S1 is taken, and at step 136, the level of the wiper continuous operation input port S1 is determined. At this time, if the wiper continuous operation switch SW2 is kept ON, the level of the wiper continuous operation input port S1 becomes high level (H).
Therefore, the process proceeds to step 105, and step 106
To repeatedly execute the subsequent steps, the wiper arm 12
At a position slightly past the position B, and then toward the second position A, and swings back and forth between the first position B and the second position A. On the other hand, if the wiper continuous operation switch SW2 is turned off, the process proceeds from step 136 to step 142.

Step 14 shifted from step 136
2, the output port O2 for reverse rotation goes high, the output port O1 for normal rotation goes low, and the output port O2 for reverse rotation goes high.
Transistor TR2 is turned on, and the second relay coil RL2-1 of the second relay RL2 is excited, so that the current of the power supply 50 from the second brush terminal 2b of the wiper motor 2 to the first brush terminal 2a Are supplied in the reverse direction, and the output shaft 2f starts reverse rotation.

When the output shaft 2f of the wiper motor 2 starts reverse rotation, the wiper arm 12 stopped at the first position B starts rotating toward the storage position C. The first position detection signal input port SB and the second position detection signal input port SA are taken in, and the level of the first position detection signal input port SB, the second position detection The level of the signal input port SA is determined.

At this time, the wiper arm 12 is
Until the first position detection signal input port SB
Is low level (L), and the second position detection signal input port S
Since A is at the high level (L), steps 143 and 144 are repeated, and when the wiper arm 12 reaches the storage position C, the first position detection signal input port SB is at the high level (H) and the second position detection is performed. Signal input port SA
Becomes high level (H), so that the process proceeds from step 144 to step 145, where the reverse rotation output port O2 is switched from high level (H) to low level (L), and the second transistor TR2 is turned off. , Wiper motor 2
Means that the power supply path is cut off and the output shaft 2f stops,
The wiper arm 12 stops at the storage position C, and returns to step 101.

When the wiper continuous operation switch SW2 is turned on while the ignition switch SW1 is turned on, the wiper arm 12 is moved to the first position B and the second position B.
When the ignition switch SW1 is turned off during the swinging between the positions A, the wiper motor 2 cuts off the energizing path.
It stops at the position where the energization was cut.

Thereafter, the wiper arm 12 is moved to the first position B.
When the ignition switch SW1 is turned on and the wiper continuous operation switch SW2 is turned on in a state where the motor is stopped between the second position A and the second position A, initialization is performed by the reset circuit 10 in step 100, and step 101
, The input of the wiper continuous operation input port S1 is taken in, the level of the wiper continuous operation input port S1 is determined in step 102, and the level of the first position detection signal input port SB and the second position detection signal are determined in step 104. The level of the input port SA is determined.

At this time, since the wiper arm 12 is not at the first position B, not at the second position A, not at the storage position C, and between the first position B and the second position A,
Since the first position detection signal input port SB is at low level (L) and the second position detection signal input port SA is at low level (L), steps 104 to 13 are performed.
7, the level of the first position detection signal input port SB and the level of the second position detection signal input port SA are determined again. As a result of the determination in step 137, the flow shifts from step 137 to step 138. In step 138, the level of the first position detection signal input port SB and the level of the second position detection signal input port SA are determined, and the process proceeds to step 139.

Step 13 shifted from step 138
9, the forward rotation output port O1 goes high, the reverse rotation output port O2 goes low, and the forward rotation output port O1 goes high.
Of the power supply 50 from the first brush terminal 2a of the wiper motor 2 to the second brush terminal 2b because the transistor TR1 of the wiper motor 2 is turned on and the first relay coil RL1-1 of the first relay RL1 is excited. Is supplied in the forward direction, the output shaft 2f starts forward rotation, and the routine proceeds to step 140.

Step 14 shifted from step 139
At 0, the first position detection signal input port SB and the second position detection signal input port SA are fetched, and at step 141 shifted from step 140, the level of the first position detection signal input port SB, Since the level of the position detection signal input port SA is determined, steps 140 and 141 are repeated while the wiper arm 12 is between the first position B and the second position A, and the wiper arm 12 is moved to the second position A. Is reached, the process proceeds from step 141 to step 116, the routine after step 116 is executed, and the wiper arm 12 is stopped at the second position A until the timer 2 times out,
After the timer 2 times out, the wiper arm 12
Are swung from the second position A to the first position B to perform a continuous operation.

When the wiper continuous operation switch SW2 is turned on while the ignition switch SW1 is turned on, the wiper arm 12 swings between the first position B and the second position A. When the wiper arm 12 is at the first position B, the ignition switch SW1 is turned off, and after the wiper arm 12 stops at the first position B, the ignition switch SW1 is turned on, and the wiper continuous operation switch SW2
Is turned on, steps 100 to 103 are executed.
After executing the routine, the process proceeds to step 137 in the level determination in step 104, and
In step 138, the flow proceeds to step 138, and in step 138, the flow proceeds to step 120. Therefore, step 120 and subsequent steps are executed, and the wiper arm 12 stopped at the first position B is moved to the first position B. Starts to swing toward the second position A.

As described above, the wiper arm 12 is
If the elapsed time for moving the wiper arm 12 from the position B to the second position A or the wiper arm 12 from the second position A to the first position B is short, the speed of the wiper arm 12 is high.
A control to shorten the amount of overrun of the wiper arm 12 from the second position A or the first position B is performed,
On the other hand, if the elapsed time for the wiper arm 12 to move from the first position B to the second position A or for the wiper arm 12 to move from the second position A to the first position B is long, the speed of the wiper arm 12 is increased. Is slow, so the second position A
Alternatively, control is performed with the amount of overrun from the first position B as a longer time, and the amount of overrun of the wiper arm 12 is adjusted based on the current speed of the wiper arm 12, and the second position A side of the wiping surface and This prevents the unwiped portion from being left on the first position B side.

[0113]

As described above, according to the wiper control apparatus according to the first aspect of the present invention, when the wiper blade starts the wiping operation, the wiper blade moves within the predetermined range. The elapsed time is detected by the elapsed time detection circuit, the elapsed time data is obtained, and when the wiper blade reaches a predetermined position, the position detection means generates a detection signal. The drive circuit is delayed by the delay time generated by the delay time generation circuit based on the value of the elapsed time data thus obtained, and the inversion operation is performed. Therefore, the power supply voltage fluctuates and the load fluctuation on the wiping surface of the wiper blade does not occur. If the current speed of the wiper blade moving within the predetermined range is high, the wiper blade may overrun By slightly delaying the timing of stopping the wiper motor in accordance with the minute, if the current speed of the wiper blade is slow, on the other hand, delaying the timing of stopping the wiper motor in excess of the slightly overrunning of the wiper blade is delayed. The amount by which the wiper blade is overrun from the stop position is appropriately adjusted, and thereby, even if the power supply voltage fluctuates or the load on the wiping surface of the wiper blade fluctuates,
By not changing the stop position when the wiper blade is turned over, the obstruction of the field of view due to the remaining wiping is eliminated, so that there is an excellent effect that safe driving can be performed.

According to the wiper control device of the second aspect of the present invention, when the wiper blade starts the wiping operation,
The elapsed time when the wiper blade moves between two points of the first position and the second position is detected by an elapsed time detection circuit to obtain elapsed time data, and the wiper blade is moved to the first position or the second position. When the position is reached, the position detection means generates a detection signal, and the control means controls the drive circuit with the delay time generated by the delay time generation circuit based on the value of the elapsed time data obtained from the elapsed time detection circuit. Since the reversal operation is performed with a delay, even if the power supply voltage fluctuates or the load on the wiping surface of the wiper blade fluctuates, the wiper blade that moves between the first position and the second position moves. If the current speed is high, the timing to stop the wiper motor is slightly delayed in accordance with the overrun of the wiper blade, and the wiper If the current speed of the wiper blade is slow, the timing of stopping the wiper motor is delayed more in accordance with the amount of overrun of the wiper blade, and the amount of overrun of the wiper blade from the stop position is appropriately adjusted, whereby Even if the power supply voltage fluctuates or the load fluctuates on the wiping surface of the wiper blade, by eliminating the stop position when reversing the wiper blade, the obstruction of the view due to the remaining wiping is eliminated. It has an excellent effect that safe driving can be performed.

According to the wiper control device of the third aspect of the present invention, the control means receives the second detection signal generated by the first position switch when the wiper blade reaches the second position. And delaying the inversion operation of the drive circuit by the delay time generated by the delay time generation circuit based on the value of the elapsed time data obtained from the elapsed time detection circuit, and the wiper blade arrives at the first position. When the first detection signal generated from the second position switch is provided, the timing for inverting the drive circuit with the delay time generated by the delay time generation circuit is determined based on the value of the elapsed time data obtained from the elapsed time detection circuit. Because of the delay, even if the power supply voltage fluctuates or the load on the wiper blade If the current speed is high, the timing of stopping the wiper motor is slightly delayed in proportion to the overrun of the wiper blade, while if the current speed of the wiper blade is low, the wiper blade overruns slightly. By delaying the timing of stopping the wiper motor in proportion to the minute, the amount of overrun of the wiper blade from the stop position is appropriately adjusted, whereby the power supply voltage fluctuates and the load fluctuation on the wiping surface of the wiper blade is reduced. Even if the wiper blade is turned over, the stop position when the wiper blade is turned over is not changed, so that the obstruction of the field of view due to the remaining wiping is eliminated, and an excellent effect that the safe driving can be performed.

According to the wiper control device of the fourth aspect of the present invention, the control means determines that the first contactor is cut off from the contact plate when the wiper blade reaches the second position, and the second detection signal is output. Is given, the timing of inverting the drive circuit is delayed by the delay time generated by the delay time generation circuit based on the value of the elapsed time data obtained from the elapsed time detection circuit, and the wiper blade reaches the first position. As a result, when the second contactor is cut off from the contact plate and the first detection signal is supplied, the drive circuit is driven by the delay time generated by the delay time generation circuit based on the value of the elapsed time data obtained from the elapsed time detection circuit. The timing to reverse the operation is delayed. Therefore, even if the power supply voltage fluctuates or the load on the wiping surface of the wiper blade fluctuates, if the current speed of the wiper blade is high, the wiper motor is stopped according to the overrun of the wiper blade. If the current speed of the wiper blade is slow, the timing to stop the wiper motor is delayed too much in accordance with the overrun of the wiper blade, and the wiper blade is moved from the stop position. The run amount is appropriately adjusted, and the position of the wiper blade can be detected by using a single contact plate, the first contactor, and the second contactor at three points. Of the power supply voltage or the wiper blade Even if there is a change in the load, the position where the wiper blade stops when it is reversed is not changed so that the obstruction of the view due to the remaining wiping is eliminated, and the safe operation can be performed, and the position of the wiper blade can be changed. There is an excellent effect that productivity can be improved by using a simple structure as a means for detection.

According to the wiper control device according to the fifth aspect of the present invention, the control means determines that the first contactor is cut off from the second conduction range forming portion when the wiper blade reaches the second position. When the second detection signal is supplied, the timing for inverting the drive circuit is delayed by the delay time generated by the delay time generation circuit based on the value of the elapsed time data obtained from the elapsed time detection circuit, and the wiper blade is moved to the first position. , When the second contactor is cut off from the third conduction range forming section and the first detection signal is given, the delay time is determined based on the value of the elapsed time data obtained from the elapsed time detection circuit. Since the timing of inverting the drive circuit is delayed by the delay time generated by the generation circuit, the power supply voltage may fluctuate or the load on the wiping surface of the wiper blade may change. Even if there is, if the current speed of the wiper blade is fast, the timing to stop the wiper motor is slightly delayed in accordance with the overrun of the wiper blade, and if the current speed of the wiper blade is slow, The amount of overrun of the wiper blade from the stop position is appropriately adjusted by delaying the timing of stopping the wiper motor in accordance with the amount of overrun of the wiper blade by a small amount, and
When detecting the position of the wiper blade, a single contact plate integrally including a first conductive range forming unit, a second conductive range forming unit, and a third conductive range forming unit;
And the second contactor can be performed at three points, so that the structure does not become complicated. Therefore, even if the power supply voltage fluctuates and the load on the wiping surface of the wiper blade fluctuates, the wiper By not changing the stop position when reversing the blade, the obstruction of the view due to the remaining wiping is eliminated, safe operation can be performed, and the means for detecting the position of the wiper blade is produced as a simple structure It has an excellent effect of improving the performance.

According to the wiper control device of the sixth aspect of the present invention, the control means determines that the first contactor is cut off from the second conduction range forming portion when the wiper blade reaches the second position. When the second detection signal is supplied, the timing for inverting the drive circuit is delayed by the delay time generated by the delay time generation circuit based on the value of the elapsed time data obtained from the elapsed time detection circuit, and the wiper blade is moved to the first position. , When the second contactor is cut off from the third conduction range forming section and the first detection signal is given, the delay time is determined based on the value of the elapsed time data obtained from the elapsed time detection circuit. The timing of inverting the drive circuit is delayed by the delay time generated by the generation circuit.
Then, when the wiper blade reaches the storage position, the control unit detects the third contact signal generated by the position detection unit when the first contactor or the second contactor is cut off from the fourth conduction range forming unit. Since the drive circuit is stopped and the wiper blade is stopped at the storage position, even if the power supply voltage fluctuates or the load on the wiping surface of the wiper blade fluctuates, if the current speed of the wiper blade is high, The timing of stopping the wiper motor is slightly delayed according to the overrun of the blade, whereas if the current speed of the wiper blade is slow, the wiper motor is stopped corresponding to the overrun of the wiper blade slightly. Overrun the wiper blade from the stop position by delaying the timing a little longer Are appropriately adjusted, and the first conductive range forming unit, the second conductive range forming unit, the third conductive range forming unit, and the fourth conductive range forming unit are integrated when detecting the position of the wiper blade. , The first contactor and the second contactor can be used for three points, so that the structure does not become complicated, so that the power supply voltage fluctuates or the wiper blade is wiped. Even if there is a load fluctuation on the surface, the position where the wiper blade stops when it is turned over is not changed, thereby preventing obstruction of the view due to the remaining wiping, enabling safe operation and the position of the wiper blade. There is an excellent effect that productivity can be improved by using a simple structure as a means for detecting.

[Brief description of the drawings]

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

FIG. 2 is an internal configuration diagram of control means in the wiper control device shown in FIG.

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

FIG. 4 is a plan view of a position detecting unit in the wiper control device shown in FIG.

FIG. 5 is a longitudinal sectional view of the position detecting means shown in FIG. 4 in a wiper motor.

FIG. 6 is a timing chart for explaining a control operation over time in the wiper control device shown in FIG. 1;

FIG. 7 is a timing chart for explaining a control operation over time in the wiper control device shown in FIG. 1;

FIG. 8 is a flowchart illustrating a control operation in the wiper control device illustrated in FIG. 1;

FIG. 9 is a flowchart illustrating a control operation in the wiper control device illustrated in FIG. 1;

FIG. 10 is a flowchart illustrating a control operation in the wiper control device illustrated in FIG. 1;

11 is a flowchart illustrating a control operation in the wiper control device illustrated in FIG.

FIG. 12 is a flowchart illustrating a control operation in the wiper control device illustrated in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wiper control device 2 Wiper motor 2f Output shaft 3 Drive circuit 4 Position detecting means 5 Elapsed time detecting circuit 6 Delay time generating circuit 7 Control means 11 Rotating plate 13 Wiper blade 14 Contact plate 14a First conduction range forming part 14b Second Conductive range forming unit 14c Third conductive range forming unit 14d Fourth conductive range forming unit 15 First contactor 16 Second contactor 50 Power supply RS1 First wiper position detection switch RS2 Second wiper position detection switch

Claims (6)

[Claims] 1. A wiper motor for reciprocatingly oscillating a wiper blade by supplying current from a power supply, a drive circuit electrically connected between the wiper motor and the power supply, and capable of supplying a current of the power supply to the wiper motor; And an elapsed time detection circuit that detects elapsed time when the wiper blade moves within a predetermined range and obtains elapsed time data, and the wiper blade reaches a predetermined position within the wiping range. A position detection means for generating a detection signal when the detection signal is generated, and a delay time generation for generating a delay time based on the value of the elapsed time data obtained by the elapsed time detection circuit when the detection signal is generated by the position detection means. And a control means for inverting the drive circuit by delaying the drive circuit with the delay time generated by the delay time generation circuit. Control device. 2. The elapsed time detection circuit detects elapsed time when the wiper blade moves between two points, a first position and a second position, and obtains elapsed time data. 2. The wiper control device according to 1. 3. A position detecting means for generating a second detection signal when the wiper blade reaches a second position.
The wiper position detection switch and the wiper blade
3. The wiper control device according to claim 2, further comprising a second wiper position detection switch that generates a first detection signal when the position of the wiper is reached. 4. A position detecting means, comprising: a rotating body coupled to an output shaft of the wiper motor and rotating with the output shaft; and a single rotating body disposed on the rotating body and having a predetermined conduction range. And a wiper blade, which is electrically connected to the control means and is electrically connectable to the contact plate.
A first contactor cut off from the contact plate when the contactor reaches the position, and a first contactor electrically connected to the control means and electrically connectable to the contact plate, wherein the wiper blade is connected to the first contactor. The wiper control device according to claim 3, further comprising a second contactor that is disconnected from the contact plate when the wiper reaches the position. 5. A contact plate included in a position detecting means, wherein a first conductive range forming portion disposed near the center of the rotating body, and a first conductive range forming portion is formed outside the first conductive range forming portion. Forming a second conduction range in which the first contactor is formed so as to be electrically connected to the portion and concentric with the rotating body and electrically connectable to the first contactor in a range slightly smaller than the wiping range of the wiper blade. And a portion which is electrically connected to the second conductive range forming portion and disposed outside the second conductive range forming portion, and which is concentric with the rotating body and slightly larger than the wiping range of the wiper blade. The wiper control device according to claim 4, wherein the second contactor is integrally provided with a third conduction range forming portion formed so as to be electrically connectable. 6. A contact plate included in the position detecting means, which is electrically connected to the first conduction range forming portion or the second conduction range forming portion, and is electrically connected to the first conduction range forming portion or the second conduction range forming portion. A fourth conduction range forming portion extending coaxially with the rotating body from the conduction range forming portion is provided, and the position detecting means detects the first contactor or the second contactor when the wiper blade reaches the storage position. When the second contactor is cut off from the fourth conduction range forming section, a third detection signal is generated, and the control means stops the drive circuit based on the third detection signal given by the position detection means. Claim 5
4. The wiper control device according to claim 1.