JPS6346289Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a wiper control device that intermittently controls wipers used in vehicles such as automobiles, and in particular, the intermittent operation time is made to vary continuously depending on driving conditions. be.

Generally, when an automobile is driven in rain, water droplets adhering to the windshield are wiped away by wipers. In this case, if you are driving in heavy rain, the wipers must operate continuously to wipe away the water droplets, but in light rain, intermittent operation is sufficient, so you can adjust the operating status of the wipers depending on the rain situation. I was switching.

However, even in the case of light rain, the amount of water droplets adhering to the vehicle decreases as the vehicle speed decreases, so the driver must change the operating state of the wiper each time the vehicle speed changes, which is extremely troublesome.

Therefore, an object of this invention is to provide a wiper control device that does not require changing the intermittent operation time of the wiper in response to changes in driving conditions.

In order to achieve this purpose, this idea
The intermittent operating time of the wiper is continuously changed by both a circuit that determines the intermittent operating time depending on the vehicle speed and a circuit that determines the intermittent operating time between stops. Hereinafter, this invention will be explained in detail using drawings showing examples.

The figure is a block diagram showing one embodiment of this invention. In the figure, 1 is a vehicle speed sensor that generates a pulse every time the vehicle leaves a predetermined distance from the road, 2 is a counter that counts these pulses and generates an output signal when the counted value reaches a predetermined value, and 3 and 4 are counters 2 and 4. Every time an output signal is generated, a reset signal is generated to counter 2.
capacitor and resistor for resetting, 5
6 is an oscillation circuit that generates an output signal with a cycle sufficiently longer than the maximum repetition cycle of the output signal generated from the counter 2, and 6 is an output signal that is generated when either the counter 2 or the oscillation circuit 5 generates an output signal. 7 is a trigger circuit that generates a trigger signal for a predetermined period when a signal is supplied. Note that 8 and 9 generate a reset signal every time an output signal is generated in the OR circuit 6, and the oscillation circuit 5
capacitor and resistor for resetting, 6
1 and 62 are diodes, and 10 is a wiper. The wiper 10 starts operating only when a trigger signal is supplied for a short period of time, and automatically stops at the original position after making one reciprocation.

The operation of the device according to the invention configured as described above is as follows. Since no pulse is generated from the vehicle speed sensor 1 while the vehicle is stopped, the counter 2 also does not generate an output signal. On the other hand, the oscillation circuit 5 generates an output signal after a predetermined time period, regardless of whether the vehicle is running or stopped. Since this output signal is supplied to the trigger circuit 7 via the OR circuit 6, the trigger circuit 7 generates a trigger signal that continues for a predetermined period after being supplied with the signal. As a result, the wiper 10 starts operating in response to a trigger signal supplied from the trigger circuit 7, and after the blade makes one reciprocation, it stops at the original position. Furthermore, the output signal of the OR circuit 6 is differentiated by the capacitor 8 and the resistor 9 and is supplied to the reset terminal R of the oscillation circuit 5, so that the oscillation circuit 5 is reset after generating the output signal, and the output signal is sent out. I won't. However, once the reset signal ends, the oscillation circuit 5 generates an output signal again after a predetermined period of time, so that the wiper 10 is again supplied with the trigger signal from the trigger circuit 7 and operates. The oscillation circuit 5 is then reset again by generating the output signal, so that it generates a repetitive signal. As a result, the trigger circuit 7 supplies a trigger signal to the wiper 10 every time a signal is generated from the oscillation circuit 5. In this case, the signal generation period of the oscillation circuit 5 is
If you leave it for about 20 seconds, wiper 10 will wipe once every 20 seconds.
Perform intermittent movements.

When the automobile starts traveling, the vehicle speed sensor 1 generates a pulse every time the vehicle leaves a predetermined distance from the traveling road. The counter 2 counts these pulses and generates an output signal when the counted value reaches a predetermined value. This output signal is differentiated by a capacitor 3 and a resistor 4 and then sent to a counter 2.
The counter 2 is supplied to the reset terminal R of the counter 2.
is reset and no longer generates an output signal. Since the counter 2 counts the pulses supplied from the vehicle speed sensor 1 again after the reset operation is completed, it generates a pulse-like repetitive signal while the vehicle speed sensor 1 is generating pulses, that is, while the vehicle is running. Since this repeated signal is supplied to the trigger circuit 7 via the OR circuit 6, the trigger circuit 7 generates a trigger signal every time the repeated signal is supplied, and this signal is supplied to the wiper 10. Therefore, the wiper 10 operates intermittently at the cycle of the repetitive signal sent from the counter 2. By the way, the output signal of the OR circuit 6 is also supplied to the reset terminal R of the oscillation circuit 5 via the capacitor 8. Therefore, the oscillation circuit 5 is reset every time a repetitive signal is generated from the counter 2.
Furthermore, the period of this repetitive signal is set to be sufficiently shorter than the period at which the oscillation circuit 5 generates the output signal even at the longest period. As a result, the only signal supplied to the trigger circuit 7 while the vehicle is running is the repetitive signal sent from the counter 2.

On the other hand, since the vehicle speed sensor 1 generates a pulse every predetermined distance from the road, the number of pulses per unit time increases as the vehicle speed increases. Therefore, the count result of the counter 2 also reaches the predetermined value quickly, and thereby the period of the repetitive signal sent from the counter 2 is also shortened. Since the trigger circuit 7 is a circuit that generates a trigger signal every time the repetitive signal sent from the counter 2 is supplied, the trigger circuit 7 generates a trigger signal more frequently as the vehicle speed increases and the cycle of the repetitive signal sent from the counter 2 becomes shorter. It will generate a signal. As a result, as the vehicle speed increases, the intermittent operation time of the wiper 10 becomes shorter and the wiper 10 operates more frequently. Therefore, the intermittent operation time of the wiper 10 is longer when the vehicle is stopped, and becomes shorter when the vehicle is running as the traveling speed becomes faster.

As explained above, the circuit according to this invention operates the wiper using both the circuit that determines the intermittent operation time according to the vehicle speed and the circuit that determines the intermittent operation time when the vehicle is stopped. The intermittent operation time changes continuously in accordance with the vehicle speed, and the driving vehicle does not have to worry about switching the wiper operation time, which has the effect of contributing to safe driving.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of the device according to this invention. 1... Vehicle speed sensor, 2... Counter, 3, 8...
... Capacitor, 4, 9 ... Resistor, 5 ... Oscillator circuit, 6 ... OR circuit, 7 ... Trigger circuit, 10
...Wiper.

Claims (1)

[Scope of utility model registration request] A vehicle speed sensor that generates a pulse every predetermined travel distance, a counter that counts the pulses generated from this vehicle speed sensor and generates an output signal each time the counted value reaches a predetermined value, and an output signal that is generated from this counter. An oscillation circuit that generates an output signal with a cycle sufficiently longer than the repetition cycle of , an OR circuit that generates an output signal when a signal is supplied from either the counter or the oscillation circuit, and an A wiper control device that includes a trigger circuit that generates a trigger signal that continues for a predetermined period of time when generated, and operates a wiper based on the output signal of the trigger circuit.