JPH05319213A - Washer-interlocked wiper control device for vehicle - Google Patents

Abstract

PURPOSE:To hold a visual field through a window glass even during high speed running in the case of a wiper being driven when a given delay time elapses after ON-operation of a washer switch. CONSTITUTION:In ON-operation of a washer switch 2, a washer motor 9 is charged with electricity and window washer liquid is injected. Thereafter, when a delay time responding to the charge time constants of a resistor 21 and a capacitor 22 elapses, transistors 24 and 11 are orderly turned ON and an exciting coil 10 is energized to start drive of a wiper. When a car speed is increased and the ON and OFF period of the reed switch 28a of a car speed sensor 28 is shortened, the period of a differentiating pulse outputted from a differentiating circuit 47 is also shortened and the output voltage Vd of an integrating circuit 50 is increased. The output of a comparator 41 is inverted into a low level signal and transistors 38 and 35 are turned ON, in order. Thereby, charge of the capacitor 22 is effected through a resistor 21, a resistor 34, and a parallel circuit and a delay time is shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle washer interlocking wiper control device for driving a wiper in conjunction with driving of a window washer liquid ejecting means.

[0002]

2. Description of the Related Art In a device of this type, when a washer switch for driving a window washer liquid ejecting means is turned on, a wiper is driven in conjunction with the operation. The washed washer fluid is automatically wiped off. In this case, there is an unavoidable time delay until the washer fluid adheres to the windshield after the washer switch is turned on. In order to prevent damage to the wiper blade and damage to the windshield surface caused by this, an interlocking operation circuit is provided to start driving the wiper only after a certain delay time has elapsed after the washer switch was turned on. ing.

[0003]

In the conventional washer interlocking wiper control device, the wind pressure acting on the windshield is small because the wind pressure acting on the windshield is small when the vehicle is stopped or running at a low speed. Although the liquid does not spread significantly and there is no problem, the following problems arise due to the constant delay time set in the interlocking driving circuit when the vehicle is traveling at high speed. Was caused. That is, when the washer switch is turned on while the vehicle is traveling at high speed, the washer liquid adhering to the window glass in response to the driving of the window washer liquid ejecting means is instantaneously spread on the wind glass surface by the wind pressure accompanying the high speed traveling. It spreads and becomes a state of obstructing the view. However, in the conventional configuration, since the delay time until the wiper starts operating is constant, the visibility remains in the meantime,
Not preferable for safe driving.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an interlocking operation circuit for driving a wiper when a predetermined delay time elapses after the washer switch is turned on. An object of the present invention is to provide a washer interlocking wiper control device for a vehicle, which can maintain a good view through a windshield even when traveling at high speed.

[0005]

In order to achieve the above object, the present invention is an interlocking system for driving a wiper when a predetermined delay time elapses after an operation of turning on a washer switch for driving a window washer liquid ejecting means. In a vehicle washer interlocking wiper control device having a driving circuit, a vehicle speed detecting means for detecting a vehicle speed is provided, and a delay time changing means for reducing the delay time as the vehicle speed detected by the vehicle speed detecting means becomes faster. The configuration is provided.

[0006]

When the washer switch is turned on, the window washer liquid jetting means is driven so that the washer liquid is jetted to the window glass, and the interlocking operation circuit has a predetermined delay time after turning on the washer switch. When the time elapses, the wiper is driven to wipe the washer liquid adhering to the window glass. In this way, the wiper is delayed in driving after the driving of the window washer liquid ejecting means, whereby damage to the wiper blade and damage to the windshield surface are prevented. When the wiper interlocking drive as described above is performed, the delay time changing means shortens the delay time as the vehicle speed detected by the vehicle speed detecting means becomes faster. In the above, the windshield wiper is driven before the washer liquid adhering to the windshield spreads widely on the windshield surface due to the wind pressure, so that the visibility through the windshield is preferentially secured.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to an automobile front wiper will be described below with reference to FIGS.

FIG. 1 shows an electric circuit configuration. In FIG. 1, a wiper switch 1 having terminals T1 to T6 is in a stop mode position OFF and an intermittent mode position in response to an operation of an operation lever (not shown). It is configured such that it can be switched to INT, low mode position LO, and high mode position HI, respectively, and in each of these positions OFF, INT, LO, and HI, the terminals T1 to T6 are selectively connected as shown in the figure. It is designed to connect to.

The washer switch 2 having the terminals W and Ew is normally in the OFF position OFF where the terminals W and Ew are separated from each other, but when the operation knob (not shown) is operated, the terminals W and Ew are operated only during the operation period. It is switched to the ON position ON where Ew is connected. The terminal Ew of the washer switch 2 is connected to the ground line GND, and this ground line GND is connected to the ground terminal.

The power supply line + B is connected to the positive terminal of the on-vehicle battery 5 via the fuse 3 and the ignition switch 4, and the terminal T1 of the wiper switch 1 is connected.
Is connected to this power supply line + B.

The wiper motor 6 is for wiping a windshield (not shown) and has a well-known structure having a common terminal C, a high speed rotation terminal H and a low speed rotation terminal L. In this case, in the wiper motor 6, the common terminal C is connected to the ground terminal, and the high speed rotation terminal H and the low speed rotation terminal L are connected to the terminals T2 and T3 of the wiper switch 1, respectively.

The fixed position stop switch 7 is used for the wiper motor 6
It is a well-known structure that is provided in association with, and when the wiper is in a predetermined standby position, it is switched to a detection state in which the contact points (c-b) are turned on, and the wiper is moved from the standby position. At times, it is switched to a non-detection state in which the contact points (ca) are turned on. At this time, in the fixed position stop switch 7, the contact point a is connected to the power supply line + B, the contact point b is connected to the ground terminal, and the common contact point c is further connected.
Is the relay switch 8 for the terminal T4 of the wiper switch 1.
Are connected via the normally closed contacts (c-b).
The normally open contact a of the relay switch 8 is the power line +
Connected to B.

A pump motor 9 as a window washer liquid injection means is for driving a washer pump having a well-known structure in an automobile to inject the window washer liquid onto the windshield. The power supply line + B and the terminal W of the washer switch 2 are used. Is connected between and.

The exciting coil 10 for driving the relay switch 8 has one end connected to the power supply line + B and the other end connected to the ground line GND through the collector and the emitter of the npn transistor 11. still,
A resistor 12 is connected between the base and the emitter of the transistor 11, and a constant voltage diode 13 of the illustrated polarity for overvoltage protection is connected between the collector and the emitter.

The interval control circuit 14 is for determining the intermittent wiping cycle of the wiper in the intermittent mode, and has the following configuration. That is, the interval control circuit 14 connects the capacitor 15 as a timing element between the terminal T5 of the wiper switch 1 and the common contact c of the fixed position stop switch 7, and connects between the terminal T5 and the power supply line + B. In addition, a variable resistor 16 and a resistor 17 for adjusting the interval time are connected in series, and a diode 18 and a resistor 19 of the illustrated polarity are connected in series between the terminal T6 of the wiper switch 1 and the base of the transistor 11. Become.

The interlocking operation circuit 20 is for driving the wiper when a predetermined delay time elapses after the washer switch 2 is turned on, and has the following configuration.

That is, in the interlocking operation circuit 20, between the terminal W of the washer switch 2 and the power supply line + B,
A resistor 21 and a delay time determining capacitor 22 are connected in series, and a resistor 23 is connected in parallel with the capacitor 22.
Are connected. Further, between the power supply line + B and the ground line GND, a resistor 25 and a capacitor 26 for ensuring an operating time when the wiper is interlocked are connected in series between the emitter and collector of the pnp transistor 24. Further, the common connection point of the resistor 21 and the capacitor 22 is connected to the base of the transistor 24, and the common connection point of the resistor 25 and the capacitor 26 is connected to the base of the transistor 11 via the resistor 27.

On the other hand, a vehicle speed sensor 2 as a vehicle speed detecting means
Reference numeral 8 is a well-known structure having a reed switch 28a that is turned on and off at a cycle corresponding to the speed of the vehicle. One end of the reed switch 28a is connected to the terminal Tv corresponding to the input terminal of the vehicle speed detection circuit 29, and the other end is Is connected to the ground terminal.

The vehicle speed detecting circuit 29 corresponds to the delay time changing means in the present invention, which will be described below.

That is, a constant voltage diode 31 and a resistor 32 of the polarities shown are connected in series between the auxiliary power line + Vcc connected to the power line + B via the resistor 30 and the ground line GND. The smoothing capacitor 33 is connected. Between the base of the transistor 24 in the interlocking operation circuit 20 and the contact W of the washer switch 2, a resistor 34, a collector / emitter of an npn-type transistor 35 and a diode 36 of the polarity shown are connected in series. A resistor 37 is connected between the base and emitter of 34.

Between the auxiliary power line + Vcc and the base of the transistor 34, a series circuit of a resistor 39 and an emitter / collector of a pnp type transistor 38 is connected, and a resistor 40 is connected between the emitter and base of the transistor 38. Are connected.

The comparator 41 consisting of an operational amplifier is
The connection is such that power is supplied from the auxiliary power supply line + Vcc and the ground line GND, and its output terminal is connected to the base of the transistor 38 via the resistor 42. The output terminal of the comparator 41 is connected to the auxiliary power supply line + Vcc via the pull-up resistor 43, and is also connected to its own non-inverting input terminal (+) via the resistor 44 for adding hysteresis.

The reference voltage generating circuit 45 includes a voltage dividing resistor 45 between the auxiliary power supply line + Vcc and the ground line GND.
a and 45b are connected in series, and the reference voltage Vs corresponding to the divided voltage is connected to the non-inverting input terminal (+) of the comparator 41 via the resistor 46. ..

The differentiating circuit 47 has a resistor 47a and a capacitor 47b between the auxiliary power supply line + Vcc and point P in the figure.
Are connected in series, and the common connection point of the resistor 47a and the capacitor 47b is connected to the terminal Tv via the diode 48 having the illustrated polarity.

The point P is connected to the integrating circuit 50 via the diode 49. The integrating circuit 50 is configured by connecting a resistor 50a and a capacitor 50b in series between the cathode of the diode 49 and the ground line GND, and a point Q in the drawing, which is a common connection point between them, is connected via a resistor 51. Connected to the inverting input terminal (-) of the comparator 41, and also through the resistor 52 to the ground line GN.
Connected to D. A diode 53 and a resistor 54 having the illustrated polarities are connected in series between the point P and the ground line GND.

Next, the operation of the above configuration will be described.

When the ignition switch 4 is turned on, power is supplied from the vehicle-mounted battery 5 to the power supply line + B. In this case, when the wiper switch 1 is in the OFF mode position OFF, the terminals T3 and T
When the wiper is in a predetermined standby position, the fixed position stop switch 7 is in a state where the contacts (c-b) are turned on. The capacitor 15 includes a resistor 17, a variable resistor 16 and the fixed position stop switch 7 from the power supply line + B.
Is charged through the contact points (c-b) of the capacitor 15 and the terminal voltage of the capacitor 15 rises to the voltage level of the power supply line + B.

From such a charged state, the operation control as described below is performed in response to the operation of the wiper switch 1.

The wiper switch 1 is in the intermittent mode position IN.
When switched to T ... At this time, terminals T3 and T4 of wiper switch 1
, T5 and T6 are connected to each other, and the capacitor 15 is in the charged state as described above. Therefore, the base potential of the transistor 11 is changed by the output voltage of the power supply line + B to the resistor 17 and the variable potential. It immediately rises through the resistor 16, the terminals T5 and T6, the diode 18, and the resistor 19, and the transistor 11 is turned on.

Then, the exciting coil 10 is energized to turn on the contact points (c-a) of the relay switch 8, so that the terminals T4 and T3 of the wiper switch 1 are connected between the power line + B and the contact points (c-a). The ground line GN between the low speed rotation terminal L and the common terminal C of the wiper motor 6.
An energization path reaching D is formed, and the wiper motor 6 is rotated at a relatively low speed. As a result, the operation of wiping the windshield glass by the wiper is started, and in conjunction with this, the fixed position stop switch 7 is switched to the state in which the contact points (ca) are turned on.

For this reason, both ends of the capacitor 15 are connected between the contacts (ca) of the fixed position stop switch 7, the variable resistor 16,
Although the capacitor 15 is connected to both ends of the power supply line + B via the resistor 17 and the charged electric charge of the capacitor 15 is discharged, the transistor 11 is turned on between the terminals T5 and T6 of the wiper switch 1. , And is maintained as it is through the diode 18, etc., and the power supply to the wiper motor 6 is continued.

The wiper is returned to the standby position in response to the continuation of the energization, and the fixed position stop switch 7 is contacted (c).
-B) When it returns to the state where it is turned on, at this time, since the electric charge charged in the capacitor 15 is discharged, the resistance 17
Also, the capacitor 15 is recharged via the variable resistor 16. As described above, charging of the capacitor 15 is started at the moment when the wiper returns to the standby position. As a result, the base potential of the transistor 11 is lowered and the transistor 11 is turned off.
The relay switch 8 returns to the state in which the contact points (c-b) are turned on in response to the disconnection of the exciting coil 10, and the wiper motor 6
Is cut off.

In this case, between the low speed rotation terminal L and the common terminal C of the wiper motor 6, between the terminals T3 and T4 of the wiper switch 1 and the contact (c- of the relay switch 8).
During a), the wiper motor 6 is braked and the wiper is reliably stopped at the standby position because the short-circuit is made via the contacts (c-b) of the fixed position stop switch 7.

Further, after the charging of the capacitor 15 is started as described above, the transistor 11 is turned on again when the terminal voltage becomes higher than a predetermined level. Therefore, thereafter, the wiping operation of the wiper and the stopping operation to the standby position in response to the disconnection of the wiper motor 6 as described above are repeatedly performed, whereby the intermittent wiping operation of the wiper is performed. Be seen. The cycle of the intermittent wiping operation of such a wiper is determined by the charging time constants of the capacitor 16, the variable resistor 17 and the resistor 18, and therefore the intermittent wiping operation cycle can be adjusted by the variable resistor 17.

The wiper switch 1 is in the low mode position LO.
At this time, since the terminals T1 and T3 of the wiper switch 1 are connected to each other, the power line + B is connected to the terminal terminals T1 and T3, the low speed rotation terminal L and the common terminal C of the wiper motor 6 are connected. Ground line GND through
Is formed, the wiper motor 6 is rotated at a relatively low speed, and a low-speed wiping operation of the wiper is performed.

The wiper switch 1 is in the high mode position HI.
At this time, since the terminals T1 and T2 of the wiper switch 1 are connected to each other, the power line + B is connected to the terminal terminals T1 and T2, the high speed rotation terminal H and the common terminal C of the wiper motor 6 are connected. Ground line GND through
The electric current path leading to the wiper motor is formed, whereby the wiper motor 6 is rotated at a relatively high speed, and a high-speed wiping operation of the wiper is performed.

On the other hand, when the washer switch 2 is turned on, operation control as described below is performed.

That is, when the washer switch 2 is turned on, at the same time when the washer switch 2 is turned on, the pump motor 9 is turned on.
To the contact points W and Ew,
As a result, a washer pump (not shown) is driven to inject the window washer liquid onto the windshield.

At this time, particularly, when the wiper switch 1 is in the stop mode position OFF, or when the wiper switch 1 is in the stop mode position OFF.
When the wiper is in the standby position in the intermittent mode position INT (when the intermittent wipe operation of the wiper is stopped), the interlocking operation circuit 20 and the vehicle speed detection circuit 29 come to function.

Specifically, the interlocking operation circuit 20 and the vehicle speed detection circuit 29 operate in two different modes described below according to the vehicle speed detected by the vehicle speed sensor 28.

When the vehicle speed is relatively low ... In this case, the on / off cycle of the reed switch 28a of the vehicle speed sensor 28 becomes long, so the cycle of the differential pulse output from the differentiating circuit 47 to the point P in the figure is also long. Become. Therefore, the output voltage Vd of the integrating circuit 50 (the output voltage at the point Q in the figure) does not exceed the reference voltage Vs from the reference voltage generating circuit 45, and the comparator 41 holds the state of outputting the high level signal. .. Therefore, the transistors 38 and 35 are held in the off state.

At this time, in the interlocking operation circuit 20,
Depending on the operation of the washer switch 2, the condenser 2
2 is charged through the resistor 21, and when the delay time corresponding to the charging time constant τ1 at this time elapses and the terminal voltage of the capacitor 22 rises to a predetermined level, the transistor 24 is turned on. Then, the capacitor 26 is charged through the transistor 24 and the resistor 25, and the transistor 11 is turned on after a predetermined time corresponding to the charging time constant τ 0 at this time, so that the exciting coil 10 is energized and the relay switch 8 is contacted. (C
-A) will be turned on. The charging time constant τ 0 of the capacitor 26 via the resistor 25 is set to be sufficiently small.

At this time, when the wiper switch 1 is in the stop mode position OFF and in the intermittent mode position INT, the wiper switch 1 is connected to the terminals T3 and T.
4 is connected, the wiper motor 6 is connected to the contact points (c-a) of the relay switch 8 and the terminals T4 and T4.
Electricity is supplied through the gaps between 3 and so on, and accordingly, the wiping operation of the wiper is started when a predetermined delay time Δt1 (= τ1 + τ0) elapses after the washer pump is driven. The delay time Δt1 is, for example, 0.
It is set to about 5 seconds.

After that, when the ON operation of the washer switch 2 is released, the pump motor 9 is cut off, the injection of the window washer liquid is stopped, and the transistor 24 is turned off. When the transistor 24 is turned off in this way, the charged electric charge of the capacitor 26 is discharged through the resistors 27 and 12, and the transistor 11 is turned on until the terminal voltage of the capacitor 26 falls below a predetermined level. Held in a state. Therefore, the relay switch 8 is maintained in the state in which the contact point (ca) is turned on for a predetermined time even after the ON operation of the washer switch 2 is released, and thus even after the injection of the window washer liquid is stopped. The wiper will perform the wiping operation only a plurality of times.

When the vehicle speed is relatively high: In this case, the on / off cycle of the reed switch 28a of the vehicle speed sensor 28 becomes short, so the cycle of the differential pulse output from the differentiating circuit 47 to point P in the figure is also short. Become. Therefore, the output voltage Vd of the integration circuit 50 increases as the vehicle speed increases, and when the vehicle speed becomes equal to or higher than a predetermined speed (for example, 40 km / hour), the output voltage Vd is the reference voltage generation circuit. Reference voltage V from 45
It will exceed s. Then, the output of the comparator 41 is inverted to the low level signal, and the transistors 38 and 35 are sequentially turned on.

Therefore, in the interlocking operation circuit 20, the capacitor 2 is turned on in response to the ON operation of the washer switch 2.
2 is charged through the parallel circuit of the resistor 21 and the resistor 34, and the charging time constant τ2 for the capacitor 22 becomes smaller than the charging time constant τ1 in the above case. When the delay time corresponding to the time constant τ2 elapses and the terminal voltage of the capacitor 22 rises to a predetermined level, the transistor 24 is turned on, so that the capacitor 26 is charged with the time constant τ0 and the transistor 11 is turned on, and in response to this, the exciting coil 10 is energized so that the relay switch 8 contacts the contact (c-
a) Turn on between.

At this time, when the wiper switch 1 is in the stop mode position OFF and in the intermittent mode position INT, the wiper switch 1 is connected to the terminals T3 and T.
4 is in the ON state, the wiper motor 6 is connected between the contacts (c-a) of the relay switch 8 and the terminals T4 and T4.
The power will be supplied through the gap between 3 and so on, and the wiping action of the wiper will be started when the predetermined delay time Δt2 (= (τ2 + τ0) <Δt1) elapses after the washer pump is driven. become. The delay time Δt2 is
For example, it is set to about 0.2 seconds.

When the washer switch 2 is released from the ON operation after this, the pump motor 9 is cut off and the injection of the window washer liquid is stopped.
Similarly to the above, even after the injection of the window washer liquid is stopped, the wiper performs the wiping operation only a plurality of times.

In summary, in the above-described embodiment, when the washer switch 2 is turned on while the wiper operation is stopped, the pump motor 9 is energized to inject the washer liquid into the windshield. At the same time, the interlocking operation circuit 20 functions to cause a predetermined delay time (Δt1 or Δt2) after the washer switch 2 is turned on.
Will start driving the wiper when
In response to this, the washer liquid adhering to the windshield is wiped off. Therefore, the wiper blade is delayed in driving after the window washer liquid is ejected in response to the drive of the pump motor 9 in this way, whereby damage to the wiper blade and damage to the windshield surface are prevented.

In particular, when the wiper interlocking drive as described above is performed, the delay time until the wiper interlocking drive starts after the washer switch 2 is turned on is the vehicle speed detected by the vehicle speed sensor 28. The configuration is changed such that the shorter the speed is, the more specifically, as shown in FIG. 2, when the vehicle speed is lower than the predetermined speed (40 km / h), the delay time Δt1 (about 0.5 seconds) is selected. , The delay time Δt2 when the vehicle speed is above the specified speed
Since (about 0.2 seconds) is selected,
Under high-speed vehicle conditions, the windshield wiper is driven before the washer fluid that has adhered to the windshield spreads to the windshield surface, and priority is given to securing visibility through the windshield. , It will be useful for driving a car safely.

In the first embodiment, the delay time until the interlocking drive of the wiper is started after the washer switch 2 is turned on is changed by one step, but the delay time is changed linearly. The second embodiment of the present invention adopting such a configuration will be described below with reference to FIG. 3 to FIG. 6 only in the differences from the first embodiment.

That is, in FIG. 3 showing the main part of the electrical structure, a diode 55 is interposed between the collector of the transistor 24 and the resistor 25 in the illustrated polarity state, and instead of the vehicle speed detection circuit 29 in the above embodiment. A vehicle speed detection circuit 56 is provided as a delay time changing means.

The vehicle speed detection circuit 56 has the following structure. That is, between the auxiliary power line + Vcc connected to the power line + B via the resistor 57 and the ground line GND, a constant voltage diode 58 of the illustrated polarity is provided.
And the resistor 59 are connected in series, and the smoothing capacitor 60 is connected. Between the auxiliary power supply line + Vcc and the cathode of the diode 55, a diode 62 of the polarity shown in the drawing is connected in series between the emitter and collector of the pnp-type transistor 61.
A resistor 63 is connected between the emitter and the base of the.

The counter 64 fed from the auxiliary power supply line + Vcc and the ground line GND is set at the timing when the input signal to the set terminal SET falls, and in the set state, it is input to the input terminal IN. The number of rising edges of the pulse signal is counted, and the carry signal Sc composed of a low level signal is output from the output terminal OUT when the count value reaches "10", for example. In addition, this counter 6
4 has a configuration in which when the input signal of the reset terminal RSET rises, the counting content is initialized and the output of the carry signal Sc is stopped.

The output terminal OUT of the counter 64 is connected to the base of the transistor 61 via the resistor 65, and the set terminal SET is connected to the terminal W of the washer switch 2 via the diode 66 of the polarity shown in the figure. , And is connected to the auxiliary power supply line + Vcc via the resistor 67. The reset terminal RSET of the counter 64 is connected to the ground line GND via the resistors 68 and 69 in series, and the common connection point of the resistors 68 and 69 is connected to the anode of the diode 55.

Further, the input terminal IN of the counter 64 is
The resistors 70 and 71 are connected in series to the auxiliary power supply line + Vcc, and the common connection point of the resistors 70 and 71 is connected to the terminal Tv via the diode 72 having the polarity shown in the figure. At this time, the potential level of the terminal Tv periodically changes between the potential level of the auxiliary power supply line + Vcc and the ground level according to the on / off state of the reed switch 28a included in the vehicle speed sensor 28. The pulse signal Ps having a shorter cycle as the vehicle speed of the automobile becomes faster is applied to the input terminal IN of the.

Next, the operation when the washer switch 2 is turned on while the operation of the wiper switch 1 is stopped will be described.

When the washer switch 2 is turned on, the set terminal SET of the counter 64 falls to the ground level via the diode 66 and the terminals W and Ew of the washer switch 2, so that the counter 64 starts counting operation. To do. Further, as in the first embodiment, the pump motor 9 is turned on at the same time when the washer switch 2 is turned on.
Since the current is supplied through the contacts W and Ew, the washer pump (not shown) is driven to inject the window washer liquid on the windshield, and the wiper is driven when the delay time described below elapses thereafter. It

That is, when the vehicle speed detected by the vehicle speed sensor 28 is relatively slow, the on / off cycle of the reed switch 28a of the vehicle speed sensor 28 becomes long, so that it is applied to the input terminal IN of the counter 64 as shown in FIG. The cycle of the pulse signal Ps also becomes long. On the other hand, when the washer switch 2 is turned on at the timing t1 shown in FIG. 4, the capacitor 22 is charged through the resistor 21 as in the first embodiment. In this case, if the cycle of the pulse signal Ps is long, the counter 6
The count value of 4 does not reach "10" until the delay time corresponding to the charging time constant τ1 for the capacitor 22 at this time elapses, and the carry signal Sc (low level) is output from the output terminal OUT of the counter 64. Level signal)
Is never output.

Therefore, the transistor 61 is not turned on, and the transistor 24 is turned on when the delay time corresponding to the charging time constant τ1 elapses and the terminal voltage of the capacitor 22 rises to a predetermined level. As a result, the capacitor 26 is charged through the transistor 24 and the resistor 25, and the transistor 11 is turned on after a predetermined time corresponding to the charging time constant τ 0 at this time,
In response to this, the contact between the contacts (ca) of the relay switch 8 is turned on so that the wiper motor 6 is energized, and a predetermined delay time Δt1 (= τ1 + τ0) elapses after the wiper wiping operation after driving the washer pump. It will start at the timing t2.

On the other hand, when the vehicle speed detected by the vehicle speed sensor 28 is relatively high, the on / off cycle of the reed switch 28a of the vehicle speed sensor 28 becomes short, so that the input terminal IN of the counter 64 as shown in FIG. Also, the cycle of the pulse signal Ps given to is shortened. Also in this case,
When the washer switch 2 is turned on at the timing t3 shown in FIG. 5, the capacitor 22 is charged through the resistor 21, but the pulse signal P
When the cycle of s is short, the count value of the counter 64 is the timing t4 (the capacitor 22
At a point before the delay time corresponding to the charging time constant .tau.1 with respect to .apprxeq. Is reached, "10" is reached, and the carry signal Sc (low level signal) is output from the output terminal OUT of the counter 64.

Therefore, the transistor 61 is turned on, and the capacitor 26 is charged through the transistor 24 and the resistor 25 before the delay time corresponding to the charging time constant τ 1 elapses. After a lapse of a predetermined time according to the charging time constant τ 0 of
1 is turned on, and the corresponding contact (ca) of the relay switch 8 is turned on so that the wiper motor 6 is energized. As a result, the wiper wiping operation has a predetermined delay time Δtx (= (τx + τ0 after the washer pump is driven.
) <Δt1) has elapsed, it is started at the timing t4, and the delay time Δtx becomes shorter as the vehicle speed becomes faster.

In summary, the second embodiment described above also
When the washer switch 2 is turned on while the operation of the wiper is stopped, the pump motor 9 is energized to inject the washer liquid into the window glass, and after the washer switch 2 is turned on, a predetermined period is reached. When the delay time has elapsed, the wiper is started to drive and the washer liquid adhering to the window glass is wiped off.

Particularly, in this case, the delay time until the wiper interlocking drive is started after the washer switch 2 is turned on depends on the vehicle speed of the vehicle detected by the vehicle speed sensor 28 as shown in FIG. The configuration to be changed, specifically, for example, when the vehicle speed is lower than 30 km / h, the delay time Δt1 (about 0.5 seconds) is selected, and when the vehicle speed is equal to or higher than the predetermined speed, the vehicle speed becomes faster. The delay time Δtx, which becomes shorter depending on the speed of the windshield, is selected.Therefore, control that drives the wiper before the washer liquid adhering to the windshield spreads widely on the windshield surface due to wind pressure is controlled according to the vehicle speed. You will be able to do optimally in.

[0065]

As is apparent from the above description, according to the present invention, the interlocking operation circuit for driving the wiper is provided when a predetermined delay time elapses after the washer switch is turned on. Since the delay time is changed according to the vehicle speed, there is an excellent effect that the visibility through the windshield can be maintained in a good state even when traveling at high speed.

[Brief description of drawings]

FIG. 1 is an overall circuit configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a relationship between vehicle speed and delay time.

FIG. 3 is a circuit configuration diagram of a main part showing a second embodiment of the present invention.

FIG. 4 is a timing chart for explaining the action 1

FIG. 5 is a timing chart for explaining operation 2

FIG. 6 is a view corresponding to FIG.

[Explanation of symbols]

In the figure, 1 is a wiper switch, 2 is a washer switch,
6 is a wiper motor, 7 is a fixed position stop switch, 8 is a relay switch, 9 is a washer motor (window washer liquid injection means), 14 is an interval control circuit, 20 is an interlocking operation circuit, 28 is a vehicle speed sensor (vehicle speed detection means), Two
Reference numerals 9 and 56 are vehicle speed detection circuits (delay time changing means), and 64 is a counter.

Claims (1)

[Claims] 1. A vehicle washer comprising: a washer switch for driving a window washer liquid ejecting means by an on operation; and an interlocking operation circuit for driving a wiper when a predetermined delay time elapses after the on operation of the washer switch. In the interlocking wiper control device, a vehicle speed detecting means for detecting a vehicle speed and a delay time changing means for shortening the delay time in response to an increase in the vehicle speed detected by the vehicle speed detecting means are provided. A washer interlocking wiper control device.