Electricity: motive power systems – Automatic and/or with time-delay means – Moisture content or wetness
Patent
1989-02-28
1990-04-10
Ro, Bentsu
Electricity: motive power systems
Automatic and/or with time-delay means
Moisture content or wetness
318444, 318DIG2, B60S 108
Patent
active
049163744
ABSTRACT:
An adaptive moisture sensor system includes a moisture sensor unit having a moisture sensor, which produces a moisture signal, a reference signal generating circuit and a comparator circuit for comparing the moisture signal with the reference signal and for producing an indication to the vehicle's wiper control of the relationship between the signals. The reference signal generating circuit indicates a fast positive signal processing circuit for rapidly processing changes in the moisture signal representing decreasing moisture and a slow signal processing circuit to process changes of the moisture signal in both directions at a slow rate. The fast positive signal processing circuit is only enabled during rain conditions due to a contaminant film on the sensed window. The reference signal generating circuit further includes a fast negative signal processing circuit which responds to a stable moisture signal occuring during rain conditions by rapidly offsetting the reference signal to discontinue wiper operation. Multiple sensing assemblies, each including a sensor, a reference signal generating circuit and a comparator, are combined with a master control unit, which responds to any sensing assembly indicating a rain condition, in order to switch all sensing assemblies to a rain mode.
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5 pp. from Peter Hochstein's workbook dated prior to the conceptions of the present applicants, including circuit diagrams etc.--dates blanked out for confidentiality.
3 pp. from Sieman Opto Electronic Data Book--1986 showing various types of circuits.
Drawings from copending Appl. S/N 183,693 for a Windshield Moisture Sensing Control Circuit, filed 4/19/88, U.S. Application by Hochstein entitled Rain Sensor With Reference Channel.
Peter Hochstein sketch & circuit entitled "Bench Test w/Solar Word Cells for Compensated Rain Sensor", dated prior to Applicant's conception.
Larson Mark L.
Schierbeek Kenneth L.
Schofield Kenneth
Donnelly Corporation
Ro Bentsu
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