JPS592958A - Rear wiper controller for automobile - Google Patents

Abstract

PURPOSE:To restrict the operation of a rear wiper to a minimum necessary amount, by automatically operating the rear wiper for a predetermined period of time from the time of starting an automobile. CONSTITUTION:In a rainy weather, when a contact piece a2 of a rear wiper switch SW2 is connected to a contact P and the automobile is started, a signal from a vehicle operating condition detector D becomes a high level to make a transistor Tr1 conductive. Then, transistors Tr2, Tr3 are sequentially made to be conductive, and the conductive condition is maintained for a period of time determined by a capacitor C2 and a resistor R8. In this period, a relay RL is operated, a contact RS1 is closed, and a contact RS2 is opened. Similarly, a motor M for driving the rear wiper is rotated in this period. While the transistor Tr3 is conductive, the rear wiper is operated several times, the contact RS1 is opened, the contact RS2 is closed, and the rear wiper 2 is stopped. When a transmission is set into a reverse position, a switch SW1 is closed, the relay RL is operated to continuously operate the rear wiper 2, and when the reverse position is released, the wiper 2 is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic wiper control system for automobiles, and its purpose is to prevent rain from adhering to the rear windshield most of the time when the vehicle is stationary and when driving in reverse. The rear wiper is activated several times when starting the car, and activated continuously when reversing, increasing the value of using the rear wiper.
Another purpose is to reduce the annoyance to the driver by preventing the rear wiper from operating unnecessarily.

Conventional rear wipers were operated by the driver as needed by operating a switch. Therefore, the operation was cumbersome, as it had to be activated several times when starting after a stop, when rain tends to adhere to the rear window, and it had to be activated continuously when reversing. Also,
If the timing of stopping the operation is lost during these operations, the operation 17 will occur unnecessarily, which is not desirable.

According to the present invention, when a vehicle shifts from a stopped state to a starting state, a vehicle operating state detection device detects this, and a timer operates a rear wiper driving motor for a set time to operate the rear wiper several times. When the vehicle is reversing, the motor for driving the rear wiper is continuously operated in conjunction with the reversing designation operation, regardless of the timer.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the appearance of the rear part of the automobile according to the present invention. A wiper wiper 2 is attached to the rear part 1 of the main body, and is operated automatically or manually to remove raindrops etc. from the rear window 3. It has become so. FIG. 2 is a control circuit diagram of a beam wiper, and a known vehicle operating state detection device generates a low level signal when the vehicle is stopped and a high level signal when the vehicle is running. These detection signals are applied to the base of the transistor Tr1 via R1. Transistor Tr
1 receives the positive potential B of the battery through a resistor R2 at its collector, and its emitter is connected to a low-level potential line. Resistor R3 is a pace protection resistor. The transistor Tr2 receives the potential B through the resistor R4 at its base and is normally non-conductive, and the base is connected to the resistor It5,
It is connected to the collector of the transistor Tr1 via a capacitor C, and is turned on when the transistor Tr1 is turned on. The transistor Tr3 has a resistance peak due to the collector current of the transistor Tr2.
The voltage divided by the resistor R7 is received at its base, and the transistor Tr2 is conductive during the period in which the transistor Tr2 is conductive. The base of the transistor Tr2 and the collector of the transistor Tr3 are connected via a capacitor C2 and a resistor, and for a predetermined time after the transistor Tr3 becomes conductive, that is, the capacitor C2
By continuing to discharge the capacitor C2 for a period of time based on the time constant of the resistor R8, the conduction of the transistor Tr2 is maintained, and therefore the conduction of the transistor TrB is maintained during that time. Relay coil RL receives potential B, is connected to the collector of transistor Tr3, and is conductive during the period when transistor Tr3 is conductive. One end of the rear wiper drive motor M receives potential B, and the other end is connected to a low-level potential line LK via a normally closed contact R8l operated by a relay coil.

The normally open reverse interlocking switch SW1, which is interlocked with the reverse position operation of the Transmitsushiron, is a transistor Trs (
D is connected between collector and emitter.

The manually operated rear wiper switch SW2 specifies the operation of the rear wiper drive motor M, and the contact piece a2
is at ground potential, the contact a is the cutoff contact OFF, the contact P is connected to the low-level potential line, and the contact q is connected to the other end of the rear wiper drive motor M, which are selected by the driver's free will. I'm starting to get it. switch SW
3 is the one whose contact piece a3 operates in conjunction with the rear wiper switch SW2, and each contact is OFF, and the other end of the rear wiper drive motor M is connected to the other end of the rear wiper drive motor M through a normally closed contact RS operated by the relay coil arm. It is connected to the. Then, contact piece a2 of rear wiper switch SW2 turns each contact OFF 4
wiper auto stop switch As
After the rear wiper drive motor M is de-energized, the rear wiper '2 is stopped at a predetermined auto-stop position.

Note that the contact q of the - switch SW3 is an idle contact that is connected at the same time as the contact q of the switch SW2.

With the above configuration, its operation will be explained below.

Rear wiper switch SW when necessary, such as during rainy weather.
When the contact piece a is connected to the contact point 1 by operating the , the low level potential line becomes the ground level. When the automobile is stopped, the detection signal of the vehicle operating state detection device is at a low level, so that the transistor Tr1.

Tr2 and Tr3 are out of conduction, and the rear wiper drive motor M is not driven. When the automobile starts running, the detection signal of the vehicle operating state detection device becomes high level and the tetratransistor Tr1 becomes conductive. Therefore, the transistor Tr
The base potential of transistor Tr2 is drawn into the low level potential line via resistor R5 and capacitor C1, and transistor Tr2 becomes conductive. The conduction of transistor Tr2 causes transistor TrB to conduct and remains conductive for a period of time determined by the resistive island of capacitor C2. During that time, the relay coil arm operates and closes relay contact R8.
Open relay contact R82. Similarly, the rear wiper drive motor M rotates during this time.

Rear wiper 2 during the conduction time of transistor Tr3.
operates several times, relay contact R8l is opened, relay contact R82 is closed, and the rear wiper 2 stops at the auto-stop position. Next, when the transmission is set to the reverse position, the reverse switch SW1 closes,
The relay coil arm continuously operates independently of the transistor Trl, and the rear wiper 2 continuously operates. When the reverse position designation is canceled, the vehicle similarly stops at the auto stop position. When the rear wiper switch 2 is to be operated continuously as in the conventional manner, the rear wiper switch SW2 is set to the contact q position. When the vehicle is stopped, the contact is set to the OFF position.As described above, according to the present invention, the rear wiper is automatically operated to the minimum necessary extent when starting and reversing the vehicle, and does not operate unnecessarily. To increase the utility value of a rear wiper, to make it easy to operate, and to reduce trouble for the driver.

[Brief explanation of drawings]

FIG. 1 is a rear external view of an automobile according to the invention, and FIG. 2 is a rear wiper control circuit diagram showing an embodiment of the invention. 2... Rear wiper, D... Vehicle operating state detection device,
SWl... Reverse interlocking switch, M... Rear wiper drive motor (rear wiper drive device). Procedural amendment (voluntary) May 24, 1980 Commissioner of the Japan Patent Office 1. Indication of the case 1983 Patent Application No. 111483 2. Name of the invention Automobile rear wiper control device 3. Person making the amendment Relationship to the case Patent Applicant Address: 10-1 Amanuma, Hiratsuka City, Kanagawa Prefecture Name: Nissan Shatai Co., Ltd. 4, Agent: 103 Phone: 669-4421 Address: 1-13-12 (1) Nihonbashi Kakigara-cho, Chuo-ku, Tokyo Specification No. "Rear part of the body" on page 3, line 16 is corrected to "rear part of the vehicle body." (2) "Between the collectors" and "between the collectors" and "
Insert "Configure timer" between "Capacitor" and "Capacitor". (3) In the third line of page 5 of the same book, insert ``constituting a switch means'' between ``na・teru.'' and ``relay coil.'' (4) Insert ``configures a rear wiper drive device'' between ``Narunaru.'' and ``Rear'' in the 6th line of page 5 of the same book. (5) "The contact piece a" on page 5, line 15 of the same book is corrected to "the contact piece a2J." (6) "The contact piece a is the contact point 1" on page 6, line 13 of the same book.
Correct the contact piece a2 to be the contact point p. (7) Box 2 in the attached drawing is amended as shown in the attached sheet. that's all

Claims (2)

[Claims] (1) A vehicle operating state detection device that detects the stopped state and running state of the vehicle and generates each detection signal, and starts operating at the time when the vehicle operating state detection device transitions from the stopped state signal to the running state signal. A rear wiper control device for an automobile, comprising: a timer that generates an operation signal to set a predetermined operation time of a rear wiper; and a switch means that receives the operation signal of the timer and operates a rear wiper drive device for the predetermined operation time. (2) A vehicle operating state detection device that detects the stopped state and running state of the vehicle and generates each detection signal, and starts operating at the time when the vehicle operating state detection device transitions from the stopped state signal to the running state signal. a timer that generates an operating signal to set a predetermined operating time for the rear wiper; a switch means that receives the operating signal from the timer and operates a rear wiper drive device for the predetermined operating time; 1. A rear wiper control device for an automobile, comprising: a switch for operating a rear wiper drive device; and a reverse interlock switch for driving the rear wiper drive device in parallel with the drive action of the switch means on the rear wiper drive device.