JPS6124219B2 - - Google Patents

Description

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

The conventionally known wiper drive device selects and switches between three stages: high speed, low speed, and intermittent. In the case of light rain, the wiper drive device operates at low speed or intermittently. Intermittent drive is required at low speeds and while stopped. In this case, in the conventional system, it is necessary to change the switch and perform the selection operation, so there is a drawback that the switch must be changed frequently in urban areas where there are many opportunities to stop. Further, similar drawbacks occur when high-speed or low-speed driving is performed in conditions other than light rain.

In order to solve the above-mentioned conventional drawbacks, the present invention saves effort in switching operations by specifically performing low-speed and intermittent driving when the vehicle is stopped, even though the same high-speed and low-speed selection commands are given when the vehicle is running and when the vehicle is stopped. The object of the present invention is to provide a wiper device that is standardized.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle wiper drive device according to the present invention will be described below with reference to the drawings. In FIG. 1 showing a block diagram of the overall configuration and FIG. 3 showing a detailed electrical connection diagram, 1 is the battery of the automobile, 2 is the key switch, 3 is the wiper control circuit which is the control means of the present invention, and 4 is the main unit. Reference numeral 5 designates an operation switch circuit which constitutes the selection command means of the present invention, and 6 denotes a vehicle speed detection circuit which constitutes the speed detection means of the present invention. Only this circuit is controlled by the switch 5. Wiper control circuit 3
, 7 and 8 are wiper motors, 9 is a cam type stop position regulating device, 10 is a relay coil, and 11
is its c contact, and 12 is its a contact. 13 is the relay coil, 14 is its c contact, 15, 16, 1
7 and 18 are resistors, 19 and 20 are transistors, 2
1, 22, 23, 24, 25 are diodes, 2
6, 27, and 28 are capacitors, 29 is an ignition coil, 30 is a distributor contact, and 31 is a capacitor connected between the distributor contacts 30. In the vehicle speed detection circuit 6, 32, 33, 34, 35, 36, 37 are resistors;
38, 39, and 40 are transistors, 41 is a diode, and 42, 43 are capacitors. Reference numeral 44 denotes a relay coil, and 45 and 46 denote c-contacts thereof, and these contacts 45 and 46 are provided between the operation switch circuit 4 and the wiper control circuit 3. 47 is a diode.

The operation of the wiper drive device of the present invention having the above structure will be explained with reference to the operation explanatory diagram of FIG. First, by closing the switch 5, the vehicle speed detection circuit 6 starts operating and determines whether the vehicle is running or stopped.

In the vehicle speed detection circuit 6, a transistor 38 is turned on and off by a distributor contact 30 which is turned on and off in proportion to the engine speed, and when the transistor 38 is turned on and off, a transistor 39 is turned on and off. By turning on and off the transistor 39, the capacitor 43 is charged and discharged via the resistors 34 and 35, and the terminal voltage of the capacitor 43 changes depending on the cycle of charging and discharging, and the longer the cycle of charging and discharging, the higher the terminal voltage becomes. For example, when the engine speed is low (below idling speed), the charging/discharging cycle is long, so the terminal voltage of the capacitor 43 becomes high, and the voltage level determining transistor 40 becomes conductive. As the transistor 40 becomes conductive, the relay coil 44 becomes conductive. Further, when the engine speed is high (above idling speed), the operation is opposite to that described above, and the relay coil 44 becomes non-conductive. In this manner, the relay coil 44 is in a non-conductive state when the vehicle is running, and is in a conductive state when the vehicle is stopped. The wiper control circuit 3 responds to the contacts of the operation switch circuit 4 and
a is stopped, 4b is intermittent operation, 4c is low speed operation, 4
d is set to high-speed operation.

Vehicle speed detection circuit 6 does not operate (switch 5
(is in a non-conducting state), the contacts 45 and 46 of the relay coil 44 maintain the state shown in the figure. Therefore, in the case of high-speed operation, since the contact 4d is closed, the relay coil 13
operates, the contact 14 operates, and the wiper motor 8,
It is connected to the high speed rotation side terminals 7a and 8a of 9. Also, since the relay coil 10 is electrically connected through the 4d contact, the contacts 11 and 12 are activated, and the high-speed rotation side terminals 7a and 7a of the wiper motors 7 and 8 are passed through the contact 11, respectively.
Since 8a is grounded, the wiper operates at high speed. In the case of low speed operation, the 4d contact does not close, so the relay coil 13 is inactive and the contact 14 is connected to the low speed rotation side terminals 7b, 8b of the wiper motors 8, 9, and the relay coil 1 is connected through the contact 46.
0, the wiper operates at low speed.
In the case of intermittent operation, contact 4b conducts, so a charging circuit consisting of relay coil 10, capacitor 28, resistor 17, transistor 19, and diode 22, relay contact 12, resistor 15, and capacitor 2
8, a transistor 20, and a diode 23 are arranged alternately, so that the relay contact 11 repeats activation and deactivation, so that the wiper motors 7 and 8 perform intermittent operation.

Next, the case where the switch 5 is closed will be explained. When the contact of the operation switch circuit 4 is connected to the low-speed contact 4c, when the vehicle is running, the relay coil 44 is non-conductive as described above, and therefore the contact 45 does not operate, so the wiper motor 7, 8 performs low speed operation. When the vehicle stops at this time, the relay coil 44 becomes conductive, so the contact 46 is activated and connected to the intermittent circuit, and the wiper motors 7 and 8 perform intermittent operation. Furthermore, when the contact of the operation switch circuit 4 is connected to the 4d contact for high-speed operation, the wiper motors 7 and 8 operate at high speed while the car is running, but at low speed when the car is stopped. becomes.

In the vehicle speed detection circuit 6, the detected vehicle speed is set to the idling speed of the engine, but substantially the same effect can be obtained even if the speed is set slightly higher or lower. Further, the vehicle speed detection means may have a circuit configuration other than that described above, or may be of a mechanical contact type. Further, the wiper control circuit 3 may also have other configurations.

As described above, in the present invention, the vehicle speed detecting means detects whether the vehicle is running or stopping, and when the wiper is in high-speed operation, the wiper is automatically switched to low-speed operation while the vehicle is stationary, and when the wiper is in low-speed operation, the wiper is automatically switched to intermittent operation while the vehicle is stationary. Since the switch is switched, it is possible to omit frequent switching operations in places with many traffic lights, such as in urban areas, and has the excellent effect of encouraging safe driving.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the device of the present invention, FIG. 2 is an explanatory diagram of the operation of the device shown in FIG. 1,
FIG. 3 is an electrical wiring diagram showing details of the device shown in FIG. 1. 1...Battery, 2...Key switch, 3...
A wiper control circuit serving as a control means, 4... an operation switch circuit serving as a selection command means, 5... a switch,
6...Vehicle speed detection circuit serving as speed detection means.

Claims (1)

[Claims] 1. In a wiper drive device for a vehicle, which has a selection command means for selectively instructing wiper drive at each stage of high speed, low speed, and intermittent, there is a speed detection means for detecting a running state and a stopped state of a vehicle, and a speed detection means for detecting a running state and a stopped state of a vehicle, and a 1. A wiper drive device for a vehicle, comprising: control means for driving the wiper at low speed and intermittently when the command stage of the selection command means is high speed and low speed, respectively, when a stopped state is detected.