Electricity: motive power systems – Automatic and/or with time-delay means – Moisture content or wetness
Patent
1986-02-05
1987-05-12
Miller, Charles D.
Electricity: motive power systems
Automatic and/or with time-delay means
Moisture content or wetness
318643, 318DIG2, 15250C, 1525005, 200 6105, 340602, B60S 108, H02P 300
Patent
active
046653511
ABSTRACT:
A precipitation sensor for detecting when a predetermined fraction of the sensor area is covered with water drops comprises an insulating substrate, a pair of spaced electrodes of conductive material on the substrate, and an array of conductive spots on the substrate between the electrodes, the spots being arranged to define an open circuit between the electrodes when the substrate is dry and a closed circuit when at least some of the spots are bridged by water drops. This sensor uses the physical principle of percolation to respond accurately to small amounts of precipitation and is preferably integrated in the wipe area of a windshield surface and is incorporated in the wiper control system.
REFERENCES:
patent: 2668202 (1954-02-01), Kaplan
patent: 2735907 (1956-02-01), Inman
patent: 3127485 (1964-03-01), Vitolo
patent: 3649898 (1972-03-01), Inoue
patent: 3983527 (1976-09-01), Ohsato et al.
patent: 4127763 (1978-11-01), Roselli
General Motors Corporation
Hill Warren D.
Miller Charles D.
Ro Bentsu
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