| 摘要 |
In a motor vehicle, a circuit for selectively and automatically controlling the operation of the vehicle's windshield wipers and windshield washers including an astable multivibrator circuit which generates wiper control pulses, both the duration of which pulses and the interval therebetween being variable. Each wiper control pulse energizes a wiper control relay, the contacts of which, when closed, energize a wiper motor to initiate operation of the windshield wipers. Simultaneously with each wiper control pulse, the astable multivibrator also generates a pulse inverted with respect thereto. A monostable vibrator multivibrator is connected to receive the inverted pulse from the astable multivibrator through a selectively operable manual switch. The inverted pulses are differentiated, and the resulting impulses trigger the washer control monostable multivibrator which generates a washer control pulse in response to each impulse. A washer control relay is energized by each washer control pulse for the duration of each said washer control pulse to close associated contacts connected across a washer pump motor thereby energizing the windshield washer pump.
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