JPH0116685Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a headlamp wiper drive device for automobiles, etc., which can be easily operated by a relay timer device that combines a transistor and a relay device.

When a car is driven on a snowy or muddy road at night, if mud or snow that is thrown up sticks to the lens surface of the headlamp, the illuminance of the lamp will decrease, which will seriously impede safe driving. Therefore, a wiper device for wiping and cleaning the lens surface of the headlamp is required, and strict standards regarding headlamp wiper devices have already been established in European countries (West German laws, Swedish standards, etc.). According to this, the liquid container must contain enough liquid for at least 50 cleaning periods, must be easily filled with liquid, and must have a standard value for the degree of light distribution recovery after wiping. etc. are stipulated. However, just satisfying these regulations is not enough to ensure safe driving, and from the perspective of safe driving for drivers, head lamp wipers that can perform advanced wiping and cleaning functions with simple operation are needed. The device was desired. For example, there is no need to hold down the operation switch for a long time, and if the wiper wiping action and cleaning fluid spray action that have been set can be automatically achieved with a single push, the driver can concentrate on driving.
This will greatly contribute to safe driving.

The present invention has been devised in view of the above points, and an object of the present invention is to provide a drive control device for a headlamp wiper device that exhibits a reliable wiping and cleaning function with simple operation. The present invention is characterized by a drive motor that drives a headlamp wiper, a washer motor that injects cleaning liquid, a control circuit that controls the operation pattern of the drive motor and the washer motor, and a main power supply that is connected to the drive power supply. In a headlamp wiper drive control device having a switch and an operation switch, the control circuit includes a first timer circuit that simultaneously operates the washer motor and the drive motor for a predetermined period of time by an instantaneous ON operation of the operation switch; a second timer circuit that operates only the drive motor for a predetermined period of time after the operation of the circuit is completed; two relay circuits that drive the washer motor and the drive motor according to the operation signal of the timer circuit; and a contact point between the drive power source and the drive motor. and a main power relay circuit having a relay device interposed in the main power switch and connected to the main power switch. Normally, in the case of a windshield wiper device, etc., the operation pattern is to spray cleaning liquid and then wipe with a wiper, but in the present invention, an operation pattern is adopted in which spraying of cleaning liquid and wiping with a wiper start simultaneously. This is the result of experiments conducted by the inventors of the present invention in order to obtain the best operating pattern that satisfies the standards for headlamp wiper devices in the aforementioned European countries. Unlike a front window, a headlamp has a small area to be wiped, and is often very dirty due to mud and the like. In order to obtain the desired wiping and cleaning effect under such conditions, it has been found that an operation pattern in which the cleaning liquid jetting port is provided near the wiper blade and the cleaning liquid jetting and wiper wiping are started simultaneously is good.

Next, specific embodiments of the present invention will be described based on the attached drawings. FIG. 1 is a circuit diagram showing the configuration of a drive control device for two headlamp wiper devices provided on the left and right sides of an automobile according to the present invention. In Figure 1, the negative side of a DC power supply B having a predetermined voltage is grounded, and the positive side is branched into two directions, one of which is connected to the left and right sides after connecting in series with a contact CP1 that is linked to a fuse F1 and a relay RL1. Headlamp wiper drive motors M1, M2, washer motor M3, two relay drive circuits L1, L
2, and two timer circuits T via resistor R1.
1, connected to T2. The other side is relay RL via fuse F2 and main power switch IGSW.
Connected to 1. In this way, the main power supply relay circuit having the relay RL1 is provided separately from the drive circuits for the various motors, and the contact CP1 corresponding to the relay RL1 is interposed in the drive circuit for the wiper drive motors M1 and M2. Motor M1, M2
Relay plate contacts MP1 and MP2 built into
This is to prevent mud, etc. from adhering to the contacts, and if a voltage is applied to both ends of the contacts at this time, there is a risk that a minute current will be conducted and cause electrolytic corrosion.

In the relay circuit L1 for relay driving the washer motor M3, a relay RL2 connected in parallel with a diode D1 is connected to the collector of a transistor TR1 via a diode D2, and the base of the transistor TR1 is connected to a resistor R2 and a capacitor C1. The resistor R2 is directly connected to the emitter of the capacitor C1 via the resistor R3, and the emitter is directly grounded.
A contact CP2, which is opened and closed by a relay RL2, is connected in series to the ground side circuit of the washer motor M3. Left and right headlamp wiper drive motor M
The relay circuit L2 that drives relays 1 and M2 is
Relay RL3 with diode D6 connected in parallel
is connected to the collector of the transistor TR4 via the diode D7, the base of the transistor TR4 is connected to the resistor R9 and the capacitor C6, the resistor R9 is connected via the resistor R8, and the capacitor C6 is directly connected to the emitter. It is configured to be grounded. Transfer contacts CP3 and CP4, which are opened and closed by relay RL3, are connected in series to the ground side circuits of left and right headlamp wiper drive motors M1 and M2, respectively.

The two timer circuits T1 and T2, which cause the relay circuits L1 and L2 to conduct current in a desired time sequence, are constructed as follows.
The timer circuit T1 connected to the DC power supply B via the resistor R1 and the main power supply contact CP1 is a transistor.
The base of TR2 is connected to thermistor Th1 and resistor R4, resistor R4 is connected to diode D4 and capacitor C3, this capacitor C3 is connected to resistor R6, and thermistor Th1, diode D4 and resistor R6 are connected to the emitter, respectively. It is structured as follows. Also, in the timer circuit T2, the base of the transistor TR3 is a capacitor C4 and a thermistor.
After being connected to Th2 and resistor R7, they are all connected in common, and the emitter is connected to resistor R8 and resistor R9.
The other end of the resistor R8 is connected to the common connection point, and the other end of the resistor R9 is connected to the base of the transistor TR4 of the relay circuit L2. The two timer circuits T1, T2 and the relay circuits L1, L2 described above are interconnected to form a control circuit as described below. The collector of the transistor TR2 of the timer circuit T1 is connected to the base of the transistor TR1 of the relay circuit L1 via a resistor R2, and is also connected to the base of the transistor TR3 of the timer circuit T2 via a diode D3. The emitter of the transistor TR3 of the timer circuit T2 is connected to the base of the transistor TR4 of the relay circuit L2 via a resistor R9. The collector of this transistor TR3 is connected to the resistor R1. Also, in the timer circuit T1 and relay circuit L2, the base of the former transistor TR2 and the collector of the latter transistor TR4 are connected to a resistor R4, a capacitor C3, and a diode D5.
connected via. Also, timer circuits T1, T
A Zener diode ZD and a capacitor C2 are installed in parallel with the timer circuit T to define the voltage applied to the timer circuit T. Note that the thermistors Th1 and T2 provided in the two timer circuits T1 and T2, respectively,
Th2 functions to adjust variations in each timer characteristic due to changes in ambient temperature.

Timer circuit T of the control circuit configured as above
1 and the relay circuit L2, that is, a branch path is drawn out from between the capacitor C3 and the diode D5, and each is connected to one end of the operating switch OSW via the resistor R5 and capacitor C5 connected in parallel. The other end of the switch OSW is grounded.

Next, the operation of this embodiment will be explained. First, the operation pattern of the headlamp wiper device according to the present invention will be explained based on the time sequence diagram of FIG. First, turn on the main power switch IGSW. After that, just by momentarily turning on the operating switch OSW for a short time, the washer motor M3
and left and right headlamp wiper drive motors M1, M
2 is also turned on. Even if the washer motor M3 is driven for t ₁ second and turned off after spraying the cleaning liquid, the wiper drive motors M1 and M2 continue to be driven, and after t ₂ seconds have elapsed, the wiper drive motors M1 and M2 are also turned off. That is, the wiper drive motors M1 and M2 are continuously driven for t ₁ +t ₂ seconds, and the wiper wiping operation continues during this period. In order to obtain the above one-cycle operation pattern, in the present invention, the washer motor M3 and the wiper drive motors M1 and M2 are operated simultaneously at t ₁
The configuration is such that a timer circuit T1 that drives the wiper drive motors for 2 seconds and a timer circuit T2 that drives only the wiper drive motors M1 and M2 continuously for t ₂ seconds are operated in a relay manner. This is because a large capacity capacitor is required to separately configure a timer circuit for the drive time of wiper drive motors M1 and M2 of t ₁ + t ₂ seconds, which is disadvantageous in terms of cost and circuit design space. It is from.

Next, specific operations will be explained based on the electric circuit diagram shown in FIG. When the main power switch IGSW is off, no voltage is applied to the circuit and all elements are stopped. First, when the main power switch IGSW is turned on, the relay RL1 is energized, its contact CP1 is turned on, and voltage is applied to the circuit, but since the operating switch OSW is off, all elements remain stopped. Next, when the operation switch OSW is turned on, the transistor is turned on for the first time.
A base current flows through the transistor TR2 through the path TR2 → resistor R4 → capacitor C3 → capacitor C5 → ground, turning it on. Transistor TR2
As the transistor TR1 is turned on, the base current is supplied to the transistor TR1, so the transistor TR1 is turned on, energizing the relay RL2, and its contact CP2 is turned on, and power is supplied to the washer motor M3 to start driving it. Further, when the transistor TR2 is turned on, the base current of the transistor TR3 is also supplied from its collector through the path of the diode D3, the transistor TR3, the resistor R8, and the ground, and the transistor TR3 is also turned on at the same time as the transistor TR1 is turned on.
When transistor TR3 is turned on, its base current is also supplied to transistor TR4 via resistor R9, which is also turned on, energizing relay RL3, turning on its contacts CP3 and CP4, and driving both left and right wiper drive motors M1 and M2. start driving at the same time. This relay RL3 and the relay RL2 are turned on almost simultaneously, and as shown in the time chart of FIG. 2, the washer motor M3 and the wiper drive motors M1 and M2 start operating almost simultaneously. Also, when transistor TR4 is turned on, transistor TR2 → resistor R4 → capacitor C3 → diode D5 → transistor TR4 →
The new path to ground forms the base current charging circuit of transistor TR2. Therefore, even if the operating switch OSW is turned off, this new charging circuit will not be cut off. Eventually, when the capacitor C3 is fully charged, the transistor TR2 is turned off, and accordingly the transistor TR1 is also turned off.Therefore, the relay RL2 connected to this is deenergized, its contact CP2 is turned off, and the washer motor M3 is turned off. Stop. However, the transistor TR3 transfers the charge stored in the capacitor C4 to the capacitor C4→
Transistor TR3 → Resistor R8 → Capacitor C4
The base current continues to be supplied through the discharge path, and since the transistor TR3 forms an emitter follower circuit and receives current, it remains on for a while. Eventually, when the capacitor C4 finishes discharging for a predetermined period of time, the potential decreases and the transistor TR3 is turned off. Along with this, the transistor TR4 is also turned off, deenergizing the relay RL3, and its contacts CP3 and CP4 are turned off, thereby turning off the wiper drive motor. M1 and M2 stop. When the transistor TR4 is turned off, this collector potential rises, but the capacitor C3 is rapidly discharged along the path from that side → diode D4 → resistor R6 → capacitor C3 side, and remains in the initial state until the next operating switch OSW is turned on. I look forward to it.

The effects achieved by the present invention are as follows.

(1) There is no need to press the operation switch for a long time,
The wiper wiping action and cleaning liquid spraying action that have been set are automatically obtained by pressing the button once, making operation extremely easy.

(2) A main power supply relay circuit with a relay is provided separately from the motor drive circuit, and the contacts are interposed between the drive power supply and the wiper drive motor, so that dirt cannot reach the relay plate contacts built into the wiper drive motor. Even if the contacts adhere, no voltage is applied to both ends of the contacts, so electrical corrosion due to conduction of minute currents does not occur.

(3) The timer circuit is configured with a first timer circuit that simultaneously drives the washer motor and wiper drive motor for a predetermined period of time, and a second timer circuit that continuously drives only the wiper drive motor for a predetermined period of time. This eliminates the need for large-capacity capacitors, reducing costs.

(4) Since headlamps have a narrow wiping area and are often heavily soiled with mud, etc., the most efficient method is to operate the wiper at the same time as the cleaning liquid is sprayed, as in the present invention.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a headlamp wiper drive control device according to the present invention, and FIG. 2 is a time sequence diagram showing an operation pattern of the headlamp wiper device according to the present invention. Explanation of symbols, M1: Left headlamp wiper drive motor, M2: Right headlamp wiper drive motor, M3: Washer motor, IGSW: Main power switch, OSW: Operation switch, TR1, TR2,
TR3, TR4: Transistor, RL1, RL2,
RL3: Relay, Th1, Th2: Thermistor,
ZD: Zena diode.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A drive motor that drives a wiper for a headlamp, a washer motor that sprays cleaning liquid,
A headlamp wiper drive control device comprising a control circuit for controlling operation patterns of the drive motor and the washer motor, a main power switch connected to a drive power source, and an operation switch,
The control circuit includes a first timer circuit that operates the washer motor and the drive motor simultaneously for a predetermined period of time by a momentary ON operation of an operation switch, and a second timer circuit that operates only the drive motor for a predetermined period of time after the operation of the first timer circuit is completed. 2 timer circuits, two relay circuits that drive the washer motor and the drive motor in accordance with the operation signals of the timer circuits, and a relay device whose contacts are interposed between the drive power source and the drive motor and are connected to the main power switch. A headlamp wiper drive control device comprising a main power relay circuit. 3. The headlamp wiper drive control device according to item 1 above, wherein the operating time of the drive motor is twice the operating time of the washer motor. 4. The headlamp wiper drive control device according to item 2 above, characterized in that a thermistor is disposed in the timer circuit. 5. The headlamp wiper drive control device according to item 2 above, characterized in that a Zener diode is provided in the control circuit. 6. In item 2 above, the two timer circuits are a timer circuit that controls the time during which the washer motor and the drive motor are operating simultaneously, and a time circuit that controls the operating time of only the drive motor. Headlamp wiper drive control device.