Embedded self-test for rain sensors
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United States of America Patent
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Nov 23, 1999
Grant Date -
N/A
app pub date -
Oct 29, 1998
filing date -
Oct 29, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sensor for detecting moisture on an outside surface of a windshield is disclosed. The sensor includes an emitter circuit for emitting light energy, and a detector circuit for receiving light energy. A processor controls the emitter circuit and processes signals received from the detector circuit. A self test circuit is connected between the processor and the emitter circuit, the self test circuit is operably associated with the emitter circuit for generating a test signal for simulating the presence of moisture on the outside surface of the windshield.
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