JPH0315581B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiper device for an automobile.

Generally, a wiper device for an automobile is used to operate a wiper switch in the vehicle interior to drive the wiper, and to automatically wipe away water droplets that adhere to the surface of a window glass during rain or the like. By the way, with this wiper device, when the wiper rubber is dry, the wiper may not be able to move smoothly over the windshield surface, causing a so-called chatter phenomenon. By spouting the liquid, it is possible to smooth the movement of the wiper and eliminate the chattering state.

However, the conventional wiper device has the disadvantage that the washer motor switch must be operated each time the wiper chatter occurs.

This invention was made in view of the above-mentioned conventional problems, and by detecting the occurrence of wiper chatter and automatically injecting washer liquid, It is an object of the present invention to provide a wiper device for an automobile that can eliminate the chattering state of the wiper.

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

FIG. 1 shows a wiper device for an automobile according to an embodiment of the present invention. In the figure, 1 is battery, 2
is an ignition switch, 3 is a wiper switch whose ON terminal is connected to the other end of the ignition switch 2, 4 is a wiper motor that is connected to the common terminal C of wiper switch 3 and drives the wiper, and 6 is a terminal. A is a wiper position detection switch in which a is connected to the other end of the ignition switch 2, a terminal b is connected to the other end of the wiper motor 4, and a common terminal c is connected to the OFF terminal of the wiper switch 3. 6 constitutes a wiper motor power supply circuit 7 that supplies power to the wiper motor 4.

Further, 8 is a washer switch connected to the other end of the ignition switch 2, and 9 is connected between the other end of the washer switch 8 and ground, and the washer liquid is spouted onto the window glass (not shown). This is a washer motor. Also, 21 is the second
This vibration sensor switch shows only the on/off state of the vibration sensor 40 shown in the figure in terms of an electric circuit, and is connected between the common terminal C of the wiper switch 3 and the other end of a resistor 22 whose one end is grounded. Reference numerals 23 and 24 indicate a capacitor connected to the connection point between the vibration sensor switch 21 and the resistor 22, and a diode connected in series with the capacitor, and 26 and 27 indicate a capacitor and a resistor connected between the cathode side of the diode 24 and the ground. , 25 is the base resistance of the transistor 15.

FIG. 2 shows the structure of the vibration sensor 40. In the figure, 28 is a wiper arm that rotatably attaches the wiper to the vehicle body, and inside the wiper arm 28 there is an arrow A indicating the direction of rotation of the arm 28.
In the direction perpendicular to the direction, two springs 29a,
29b is attached via a weight 30 between them,
Above and below this weight 30 are weights 30.
The metal piece 31a that comes into contact when vibrates up and down,
31b is arranged, and when this weight 30 contacts either of the metal pieces 31a or 31b, the lead wire 32, spring 29b, weight 30, metal piece 31a or 31b, lead wire 33a or 33b
By closing the path, the vibration sensor switch 21 is turned on.

15 is a transistor whose emitter is grounded and a resistor 25 is connected to its base; 16 is a transistor connected to the common terminal C of the wiper switch 3 and the transistor 1;
Relay coil connected between the collectors of 5, 16
A is a normally open relay contact of a relay coil 16 connected in parallel with the washer switch 8, and 20 is a normally open relay contact point for energizing the washer motor 9 when the chatter detection means 21 detects the wiper chatter state. It is a control circuit.

Next, the operation will be explained.

In order to operate the wiper in this device, the wiper switch 3 can be turned to the ON terminal side. Then, since the ignition switch 2 is already on, current flows through the path of the battery 1, ignition switch 2, wiper switch 3, and wiper motor 4, which activates the wiper motor 4 and moves the wiper to the windshield. wipe the surface. When the wiper is to be stopped, the wiper switch 3 can be moved from the ON terminal to the OFF terminal, and when the wiper is exactly at the stop position, the power supply to the wiper motor 4 is immediately stopped and the wiper is stopped. In addition, when the wiper has not returned to the stop position, the wiper position detection switch 6 is tilted to the contact a side, so from the moment the wiper switch 3 is turned off, the battery 1,
Since current flows through the path of the ignition switch 2, wiper position detection switch 6, wiper switch 3, and wiper motor 4, the wiper motor 4
continues to rotate and the wiper continues to operate, and when the wiper returns to the stop position, the wiper position detection switch 6 falls from terminal a to terminal b, so power supply to the wiper motor 4 is stopped and the wiper stops operating. Stop.

In addition, if you want to squirt out the washer liquid, just press the knob (not shown) of the washer switch 8 to turn it on.
A current flows through the path of the ignition switch 2, the washer switch 8, and the washer motor 9,
The washer motor 9 squirts washer fluid toward the window glass. When the washer liquid is to be stopped spouting, the washer switch 8 is turned off by releasing the knob, and the power supply to the washer motor 9 is stopped.

By the way, if the above-mentioned chatter phenomenon occurs during the operation of the above-mentioned wiper, the wiper arm 28 shown in FIG. 2 moves, for example, in the direction A, dragging the wiper, and thereby the weight 30 elastically deforms the springs 29a and 29b. The upper and lower metal pieces 31a, 31 vibrate in the A direction or the opposite direction while
b alternately, and thus the vibration sensor switch 21 is repeatedly turned on and off. Then, when the vibration sensor switch 21 is turned on, the battery 1 voltage is applied to the base of the transistor 15 via the three switches 2, 3, 21, the capacitor 23, the diode 24, and the resistor 25, and then the vibration sensor switch 21 is once turned off. However, the switch 21 is turned on by the action of the diode 24 and the capacitor 26.
While the transistor 15 is repeatedly turned off, the transistor 15 is constantly turned on, thereby supplying power to the washer motor 9, which squirts the washer liquid toward the window glass. When the wiper chatter condition is eliminated, the vibration sensor switch 21 is turned off steadily, so power supply to the washer motor 9 is stopped, and the ejection of washer liquid is stopped.

As described above, according to the automobile wiper device according to the present invention, when the chattering phenomenon of the wiper occurs, it is detected and the washer liquid is automatically spouted, so that no manual operation is required. This has the effect of automatically eliminating the wiper chatter condition.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of an automobile wiper device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a vibration sensor of the device. 4...wiper motor, 9...washer motor,
20... Control circuit, 28... Wiper arm, 40...
Vibration sensor (chattering detection means).

Claims (1)

[Claims] 1. A wiper that wipes a window glass driven by a wiper motor, a washer motor that squirts washer liquid toward the window glass, and a chatter detection means that is attached to a wiper arm and directly detects vibrations of the wiper arm. A wiper device for an automobile, comprising: a control circuit that energizes the washer motor when the chatter detecting means detects a chatter state of the wiper.