JPH0116684Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper and washer interlocking device equipped with a raindrop-sensitive wiper intermittent drive device that drives the wiper intermittently according to the state of raindrops adhering to the window glass of an automobile or the like.

Conventionally, in this type of device, in order to stop the wiper at a predetermined position, the contact is switched in response to the wiper, and the movable contact piece and the stop contact are brought into contact at the predetermined stop position of the wiper, and the wiper is oscillated. An auto-stop switch is provided which brings the movable contact piece into sliding contact with the operating contact in the moving position.

However, the stop contact generally has a predetermined width in the direction in which the wiper swings, and especially when the wiper and washer are linked, the movable contact piece is spaced apart from the operating contact. Sometimes, when the timer that interlocks the wiper and washer stops, the wiper stop position does not come to the normal stop position, resulting in a so-called incorrect stop.

In other words, since the stop contact adjacent to the operating contact generally has an angular width of approximately 45° in the wiper swing direction, the movable contact moves away from the operating contact while the wiper, that is, the wiper motor, is being driven. There is a large difference in the wiper stop position between the case where the timer stops immediately after the wiper is separated and the case where the timer stops immediately before the movable contact piece makes sliding contact with the operating contact. In the latter case, the wiper stops at a position far away from the normal stop position, resulting in a so-called incorrect stop.

The present invention was devised in view of the above-mentioned drawbacks, and it is possible to make the wiper always stop at a predetermined regular stop position no matter when the washer switch is opened when the wiper and washer are linked. The purpose is to provide a wiper and washer interlocking device that can

In order to achieve the above object, the wiper and washer interlocking device according to the present invention includes a wiper motor that drives the wiper, a movable contact piece that responds to the wiper at a predetermined stop position of the wiper, and a movable contact piece that responds to the wiper in the swinging direction of the wiper. an auto-stop switch that brings the movable contact into contact with a stop contact having a predetermined width and slidingly contacts the movable contact with the operating contact at the swing position of the wiper; a washer motor connected to a power source via a washer switch; A first capacitor that is normally charged and starts to gradually discharge only when the washer switch is closed, and when the charge of this first capacitor drops to a predetermined level, it starts operating and outputs. A control circuit that generates the wiper motor, a drive means that is activated by the output of this control circuit and drives the wiper motor, and when the control circuit starts operating, it is rapidly charged, and when the washer switch is released, the movable contact piece is activated. While it is in sliding contact with the operating contact, it discharges at a predetermined time constant, and when the movable contact moves away from the operating contact, the discharge stops, and after the washer switch is released, the charge reaches a predetermined voltage level. The present invention is characterized in that it includes a second capacitor that causes the control circuit to generate an output until the voltage drops.

Hereinafter, the present invention will be explained based on an embodiment shown in the drawings.

In the figure, 1 is a power supply, and its negative pole is grounded. Reference numeral 2 denotes a washer motor connected to the power source 1 through a washer switch 2a, one end of the motor 2 being connected to the positive pole of the power source 1, and the other end being grounded through the washer switch 2a.

3 is a schematic diagram of a wiper switch;
When the stop position is set to "OFF", terminals M and L are connected,
When the intermittent position is set to ``INT'', terminals M and L and terminals W and E are connected, when set to the low speed position ``LOW'', terminals E and L are connected, and when set to the high speed position ``HIGH'', terminals E and H are connected.

A wiper motor 4 drives a wiper (not shown) and has three brushes 4a, 4b, and 4c. The brush 4a is connected to the positive electrode of the power source 1, the low speed brush 4b is connected to the terminal L of the wiper switch 3, and the high speed brush 4c is connected to the terminal H.

Reference numeral 5 refers to a movable contact piece 5a that responds to the wiper at a predetermined stop position of the wiper and a stop contact 5b having a predetermined width in the swing direction of the wiper, and a movable contact piece 5a that responds to the wiper at a predetermined stop position, and a stop contact 5b that has a predetermined width in the swing direction of the wiper. This is an auto-stop switch that brings the movable contact piece 5a and the operating contact 5c into sliding contact.

Reference numeral 6 denotes a drive means for driving the wiper motor 4 by being actuated by the output of a control circuit 8, which will be described later. In this embodiment, the drive means 6 is a relay. One end of the coil 6a of this relay 6 is connected to the positive pole of the power supply 1, and the other end is an IC that constitutes a control circuit 8, which will be described later.
Connect to the output terminal of the circuit 81. The movable piece 6b of the relay 6 is connected to the terminal M of the wiper switch 3, the normally closed fixed contact 6c is connected to the movable contact piece 5a of the auto-stop switch 5, and the normally closed fixed contact 6d is grounded.

Reference numeral 7 denotes a raindrop detector, and the raindrop detector 7 is equipped with a diaphragm that resonates in the ultrasonic range due to colliding raindrops, and an ultrasonic vibration element that generates an electrical signal with an attenuated waveform in accordance with the resonance of this diaphragm. A sensor section 7a,
and an AC amplifier 7b for AC amplifying the electric signal. The ultrasonic vibration element of the sensor section 7a is composed of a magnetostrictive element, etc., and the AC amplifier 7b is composed of amplifiers 71 and 72, capacitors C1 and C2, a Zener diode ZD1, and resistors R1 to R9.
When raindrops collide with the diaphragm of the sensor section 7a, the diaphragm resonates in the ultrasonic range (for example, 40 KHz), and the ultrasonic vibration element generates an electrical signal with a damped waveform corresponding to the resonance of the diaphragm. The electrical signal is amplified by an AC amplifier and output to terminal A, which is the output terminal of the raindrop detector 7.
generates an output signal. Terminal B is a power supply terminal, and terminal C is a ground terminal.

Incidentally, one surface of a metal case (not shown) is used as a diaphragm for the sensor section 7a, an ultrasonic vibration element is fixed to the back surface of the diaphragm, and an AC amplifier 7 is installed inside the metal case.
By storing b, a compact raindrop detector 7 can be obtained. By installing this raindrop detector 7 at any suitable place such as a windowpane, roof, bonnet, front grill, etc. via a plate-shaped ultrasonic absorbing material (for example, rubber material) (not shown), it is possible to detect raindrops. Vibration components in the ultrasonic range caused by vibrations of the vehicle body, etc., which try to be transmitted to the detector 7 can be easily removed. In addition, this raindrop detector 7 does not need to be directly attached to the vehicle body, so it is easy to install.
You can freely choose the mounting angle.

8 is a control circuit including a circuit for intermittent driving of the wiper and a circuit for interlocking the wiper and washer, and includes an IC circuit 81, a transistor 82,
83, resistor R10 to R22, Zener diode
It consists of ZD2, ZD3, diodes D1 to D6, and capacitors C3 to C9.

The IC circuit 81 has a ground terminal, an output terminal, a power supply terminal, an oscillation prevention terminal, a timer potential detection terminal, a washer interlock signal input terminal, and a wiper intermittent drive signal input terminal. The terminal is connected, and the connection point is connected to the other end of the coil 6a of the relay 6. Further, a capacitor C3 is connected between the terminal and the ground, and the terminal is connected to the output terminal A of the raindrop detector 7 via a diode D1. The terminal is resistor R10
Connect to the positive terminal of power supply 1 through
Connect 4 in parallel. This Zener diode ZD
A constant voltage obtained between the two terminals is applied between the two terminals. The terminal is connected to resistor R via capacitor C5.
10, and a series circuit of a resistor R11 and a second capacitor C6 is connected between the terminal and ground. In addition, the terminals are connected by a resistor R11 and a diode D.
2. Connected by a series circuit of resistor R12. Resistor R13 and first capacitor C between the terminal and ground
A series circuit of 7 is interposed, and one end of a resistor R14 and a diode D3 which are parallel to each other are connected between the resistor R13 and the first capacitor C7, and the other end of each is connected to the positive terminal of the power supply 1 via the resistor R15. The other end of the washer pump 2 and the washer switch 2
Connect to connection point a. The terminal is resistor R16, R
Connected to the positive pole of power supply 1 through 17 series circuits,
The connection point between the resistor R16 and the resistor R17 is connected to the terminal W of the wiper switch 3. Incidentally, a capacitor C8 interposed between the positive electrode of the power supply 1 and the ground is for noise prevention.

The transistor 82 is formed by connecting two transistors in a Darlington connection, and the base is connected to the output terminal A of the raindrop detector 7 and the diode D via a resistor R18.
1, its emitter is connected between the series circuit of resistor R11 and capacitor C6, and its collector is connected to the collector of transistor 83.

The base of the transistor 83 is connected between the connection point of the resistor R16 and the resistor R17 and the terminal W of the wiper switch 3 via a series circuit of the resistor R19 and the diode D4, and the emitter is connected between the resistor R10 and the capacitor C.
5, and a resistor R20 is interposed between the base and the emitter. Further, a connection point between the collector of the transistor 82 and the collector of the transistor 83 is connected to the power supply terminal B of the raindrop detector 7 via a resistor R21.

The normally closed contact 6C of the relay 6 is grounded through a series circuit of a resistor R22, a diode D5, and a Zener diode ZD3, and a connection point F between the diode D5 and the Zener diode ZD3 is connected between the output terminal A and the resistor R21. do. Capacitor C
9 is a capacitor for noise prevention, which is connected in parallel to the series circuit of diode D5 and Zener diode ZD3. Further, a diode D6 is provided between the connection point between the resistor R22 and the diode D5 and the connection point G between the diode D2 and the resistor R12, and a resistor R23 is provided between the movable contact piece 5a and the stop contact point 5b.

Next, the operation of the apparatus of this embodiment having the above structure will be explained.

When wiper switch 3 is set to low speed position "LOW" or high speed position "HIGH", wiper motor 4
is continuously driven at low or high speed by a closed circuit of power supply 1, wiper motor 4, wiper switch 3, and ground, respectively. When the wiper switch 3 is switched to the stop position "OFF" to stop the wiper motor 4 when the wiper is not at the stop position, the power supply 1,
Wiper motor 4, wiper switch 3, movable piece 6
b, fixed contact 6c, movable contact piece 5a, operating contact 5
c. The wiper motor 4 continues to be driven at a low speed due to the grounded closed circuit, and when the wiper reaches the stop position, the movable contact piece 5a separates from the operating contact 5c and the stop contact 5
Since the wiper motor 4 comes into contact with the contact point b, the electromagnetic braking is applied to the wiper motor 4 and the wiper motor 4 suddenly stops.

At this point, wiper switch 3 is at the stop position "OFF"
Alternatively, if the low speed position is "LOW" and the high speed position is "HIGH", the terminal of the IC circuit 81 is at a high level. In addition, the potential of the terminal is higher than the predetermined voltage level, and the second capacitor C6
The charge on the terminal is at the voltage level of the terminal.

Next, when the wiper switch 3 is set to the intermittent position "INT" in order to drive the wiper intermittently when the amount of raindrops is relatively small, the terminal W is grounded and connected to the terminal W via the resistor R16. Therefore, the terminal changes from high level to low level, and the IC circuit 81 starts operating. At this time, the potential of the terminal is higher than the predetermined voltage level, so the terminal becomes low level and the coil 6
a is excited and the movable piece 6b is switched to the normally open fixed contact 6d side. Therefore, the wiper motor 4 is connected to the power source 1,
Brush 4a, wiper motor 4, low speed brush 4
b, end L, terminal M, movable piece 6b, fixed contact 6d,
Drives at low speed with a closed earth circuit.

Thereafter, the charge of the second capacitor C6 is transferred to the diode _D2 , the resistor R12, the terminal of the IC circuit 81,
The voltage at the terminal drops below a predetermined value, and the terminal becomes high level. Therefore, the coil 6a becomes de-energized and the movable piece 6b returns to the normally closed fixed contact 6c side, but when the wiper motor 4 is driven, the movable contact piece 5 of the auto-stop switch 5
Since a is separated from the stop contact 5b and comes into sliding contact with the operating contact 5c, the wiper motor 4 includes the power source 1, the brush 4a, the wiper motor 4, the low speed brush 4b, the terminal L, the terminal M, the movable piece 6b, the fixed contact 6c, and the movable Driving continues through a closed circuit of the contact piece 5a, operating contact 5c, and ground, and when the wiper makes one reciprocation and returns to a predetermined stop position, the movable contact piece 5a comes into contact with the stop contact 5b, and the wiper motor 4 suddenly stops.

In other words, wiper switch 3 is in the intermittent position "INT"
By doing so, the wiper can immediately make one reciprocation.

Next, the operation when raindrops such as rain or splashes from a preceding vehicle collide with the raindrop detector 7 will be explained.

When the wiper switch 3 is in the intermittent position "INT", the terminal W is grounded, so the transistor 8
The base of transistor 3 becomes a low potential and the transistor 83 is turned on. Therefore, the raindrop detector 7 is connected from the power source 1 via the resistor R10, the transistor 83, and the resistor R21.
A voltage is supplied to the power supply terminal B of. When the raindrops collide with the diaphragm of the sensor section 7a, the sensor section 7a generates an electrical signal with an attenuated waveform in the ultrasonic range (for example, 40 kHz), and this electrical signal is amplified by a predetermined amplification factor by the AC amplifier 7b. pulse signal,
That is, the output signal of the raindrop detector 7 is generated. Therefore, the transistor 82 is turned on and off according to this output signal, and the second capacitor C6 is charged from the power supply 1 via the resistor R10, the transistor 83, and the transistor 82. When the potential at the terminal of the IC circuit 81 rises above a predetermined voltage level due to charging of the second capacitor C6, the terminal changes from a high level to a low level, and the coil 6a is excited and the movable piece 6
b is switched to the normally open fixed contact 6d side. This is a relay 6 which is a driving means 6 for driving the wiper motor 4.
is activated, and a circuit for grounding the low-speed brush 4b of the wiper motor 4 is formed, and the motor 4 is driven at a low speed.

As soon as the terminal becomes low level, the potential at point F becomes the ground level, so the output signal of the raindrop detector 7 is released via the diode D1 and the terminal. That is, the output signal is transmitted to the control circuit 8.
is no longer input, and the transistor 82 is turned off. Furthermore, when the wiper motor 4 is driven, the movable contact piece 5a of the auto-stop switch 5 separates from the stop contact 5b and comes into sliding contact with the operating contact 5c after a certain period of time, so that the second capacitor C6 is closed during one reciprocation of the wiper. Even if the voltage at the terminal falls below a predetermined value due to discharge and becomes a high level, the potential at point F maintains the ground level, and the output signal of the raindrop detector 7 is released via the diode D5 and the resistor 22. Ru.

In other words, regardless of the raindrop conditions such as the size of the raindrops and the interval between the raindrops, the amount of charge to the second capacitor C6 remains approximately constant, and the slope of the discharge curve of the capacitor C6 remains constant. Therefore, once the discharge time constant of the second capacitor C6, which is discharged through the diode D2, the resistor R12, and the terminal, is determined, the potential at the terminal decreases due to the discharge of the capacitor C6, and the terminal changes from a low level to a high level. The time it takes to reach the level, that is, the time the relay 6 is in operation is approximately constant regardless of the raindrop state.

Here, when the potential of the terminal falls below a predetermined voltage level due to discharge of the capacitor C6, the relay 6 stops, but since the movable contact piece 5a is in sliding contact with the operating contact 5c, the low speed brush 4b of the wiper motor 4 is A grounding circuit is formed, and the wiper motor 4 continues to drive, and when the wiper makes one reciprocation and reaches a predetermined stop position, the movable piece 5a closes the stop contact 5b.
Upon contact with the wiper motor 4, electromagnetic braking is applied and the wiper motor 4 suddenly stops.

When the wiper stops at a predetermined position, the output signal of the raindrop detector 7 is inputted to the control circuit 8 again, the transistor 82 is turned on and off, and the second capacitor C6 is charged, and after a predetermined time elapses, the terminal potential becomes a predetermined voltage. When the level is exceeded, the relay 6 is activated to drive the wiper motor 4 again, and after the wiper has made one reciprocation, it is stopped at a predetermined position. Repeat this operation below.

The time from when the wiper stops at a predetermined position to when it is next driven (rest time) is the time from when the wiper stops at a predetermined position to when the second capacitor C6 is charged by the output signal of the raindrop detector 7 and the IC circuit 81 This is the time it takes for the potential of the terminal to reach a predetermined voltage level or higher, and this time depends on the condition of the raindrops, such as the size of the raindrops and the interval between the raindrops.

Next, a case where the wiper and washer are linked will be explained.

When the washer switch 2a is closed when the wiper switch 3 is in the stop position "OFF", the washer motor 2 is immediately activated.

Here, the terminals of the IC circuit 81 are resistors R13 and R
This terminal is always at a high level until the watch switch 2a is closed, so the first capacitor C7 is charged, and therefore the first capacitor C7 is grounded until the watch switch 2a is closed. However, the terminal does not reach the predetermined level (low level) immediately, and the first capacitor C7 gradually discharges.
After a period of time until the charge disappears, it becomes low level, and the IC circuit 81 starts operating. At this time, the potential of the terminal is above a predetermined voltage level, and when the terminal becomes low level, the second capacitor C6 is rapidly charged from the terminal.
It has become IC circuit 81. Since the potential of the terminal is higher than the predetermined voltage level, the terminal becomes low level.

Here, when the charge of the first capacitor C7 drops to a predetermined level (low level) and the terminal becomes low level, it means that the control circuit 8 has started operating, and the terminal becomes low level. The time during which the control circuit 8 is generating an output indicates the time during which the control circuit 8 is generating an output. When the control circuit 8 generates an output, that is, when the terminal becomes low level, the coil 6a is excited and the movable piece 6b is switched to the normally open fixed contact 6d side. This is because the relay 6, which is the driving means 6 for driving the wiper motor 4, is activated, and a circuit is formed to ground the low-speed brush 4b of the wiper motor 4, and the wiper motor 4 is driven at a low speed. While the washer switch 5a is closed, the terminal maintains a low level and a high level, respectively, and the washer motor 2 and wiper motor 4 continue to operate.

When the washer switch 2a is released, the washer motor 2 immediately stops. On the other hand, the terminal becomes high level, but the terminal is connected to the second capacitor C.
6 is at a high level due to the charged charge, and the terminal is still maintained at a low level to continue operating the relay 6 and continue rotating the wiper motor 4 at a low speed.

Thereafter, when the wiper has reciprocated, for example, two or three times in a row, the second capacitor C, which has been discharged through the diode D2, the resistor R12, and the terminal,
6, that is, the voltage level of the terminal is the terminal,
drops to the point where it is no longer possible to maintain it at a low level,
Therefore, the relay 6 stops operating, the movable piece 6b of the relay 6 is switched to the normally closed fixed contact 6C side, and the wiper motor 4 is stopped at a predetermined stop position by the auto-stop switch 5.

In other words, wiper switch 3 is at the stop position "OFF"
When the washer switch 2a is closed, the washer motor 2 operates immediately, and the wiper is operated in conjunction with the wiper even if there is a slight delay.
Immediately after the washer switch 2a is released, the washer motor 2 stops, and the wiper moves back and forth two to three times, and then stops in conjunction with the washer motor 2. The second capacitor C6 is a timer that maintains the terminal at a low level, that is, causes the control circuit 8 to generate an output, from when the washer switch 2a is opened until its charge drops to a predetermined voltage level. Acts as

Here, when the wiper is reciprocating two or three times in succession after the washer switch 2a is released, the movable contact piece 5 of the auto stop switch 5
While a is in contact with the stop contact 5b, the potential at point G is high through the power supply 1, the stop contact 5b, the movable contact 5a, the resistor R22, and the diode D6, so the second capacitor C6 The discharge of the power source 1 stops, and while the movable contact piece 5a is not in contact with either the operation contact 5c or the stop contact 5b, the power supply 1,
The potential at point G becomes a high potential through resistor R23, resistor R22, and diode D6, and similarly, the discharge of second capacitor C6 is stopped. Note that while the movable contact piece 5a is in contact with the operating contact 5c, the operating contact 5c is grounded, so the potential at point G is a low potential, and the second capacitor C6 is discharged at a predetermined time constant.

In other words, when the washer switch 2a is opened, the second capacitor C6 is moved so that the movable contact piece 5a is connected to the operating contact 5.
While the movable contact piece 5a is in contact with the operating contact point 5c, the movable contact piece 5a discharges at a predetermined time constant, and when the movable contact piece 5a separates from the operating contact point 5c, the discharge stops.

Therefore, no matter when the watch switch is opened, the charge in the second capacitor C6 has dropped to the point where the relay 6, which is the driving means, stops operating, that is, the control circuit 8 stops generating the output. The contact state of the auto-stop switch 5 at this time is always such that the movable contact piece 5a is in sliding contact with the operating contact 5c, so that the wiper can always be stopped at the normal stop position.

Note that when the wiper switch 3 is in the low speed position "LOW" or the high speed position "HIGH", the wiper motor 4 is not interlocked with the washer pump 2 even if the washer switch 2a is closed, and is driven normally continuously. Also, when the wiper switch 3 is in the intermittent position "INT", when the washer switch 2a is closed, the wiper motor 4 does not become intermittently driven but becomes continuously driven at a low speed, and when the washer switch is then opened, the wiper motor 4 is driven continuously at a low speed. After the rotary wiper moves back and forth continuously, it becomes normal intermittent drive.

As described above, according to the present invention, when the wiper is linked with the washer, no matter when the closed washer switch is opened, the electric charge in the second capacitor generates the output of the control circuit. The contact state of the auto stop switch when the wiper is lowered to the point where it stops is always the state where the movable contact piece is in sliding contact with the operating contact, and therefore the wiper always stops at a predetermined regular stop position, so-called This has the effect of eliminating unauthorized stops and ensuring visibility.

[Brief explanation of the drawing]

The figure is a circuit diagram showing an embodiment of a wiper-washer interlocking device according to the present invention. DESCRIPTION OF SYMBOLS 1... Power source, 2... Washer motor, 2a... Washer switch, 4... Wiper motor, 5... Auto stop switch, 5a... Movable contact piece, 5b... Stop contact, 5c... Operation contact, 6... Drive means, 8... Control circuit , C7...first capacitor, C6...second capacitor.

Claims (1)

[Scope of utility model registration request] A wiper motor that drives the wiper is brought into contact with a movable contact piece that responds to the wiper at a predetermined stop position of the wiper and a stop contact having a predetermined width in the swing direction of the wiper, and at a predetermined stop position of the wiper. an auto-stop switch that brings the movable contact piece into sliding contact with an operating contact, and a washer motor connected to a power source via a washer switch, which is normally charged and when the washer switch is closed. a first capacitor that gradually starts discharging; a control circuit that starts operating and generates an output when the charge of the first capacitor drops to a predetermined level; and a control circuit that operates based on the output of this control circuit to drive the wiper motor. and a driving means that is rapidly charged when the control circuit starts operating, and discharges at a predetermined time constant while the movable contact piece is in sliding contact with the operating contact when the washer switch is released. and a second capacitor which stops discharging when the movable contact moves away from the operating contact and generates an output to the control circuit from when the washer switch is opened until the charge drops to a predetermined voltage level. A wiper and washer interlocking device.