Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1997-01-22
1998-07-14
Williams, Hezron E.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
318483, 340604, 73 73, B60S 108, H02P 300, G01R 2726
Patent
active
057807191
ABSTRACT:
A rain sensor system automatically controls windshield wiper action such as the length of time between windshield wiper strokes and/or wiper motor speed and is preferably integrated with a vehicle antenna. The rain sensor system comprises first and second electrical conductors spaced uniformly from one another and an electrical insulator interposed therebetween. A dual network voltage divider circuit couples the first conductor to an applied reference DC voltage level, and the second conductor is coupled to ground potential via a similar network. Airborne raindrops and moisture temporarily adhere to the exposed surfaces of the insulator to electrically couple the exposed surfaces of the first and second conductive surfaces to lower the electrical resistance therebetween. The magnitude of the applied voltage changes in relation to the intensity of rainfall or amount of raindrops adhering to the conductors to affect the rate of windshield wiper action. An rpm speed linearizing circuit may also be employed to compensate the rate of windshield wiper action in response to vehicle speed. The conductor has an elongated shape for providing self-clearing of raindrops or moisture from the sensor.
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Wiggins J. David
Williams Hezron E.
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