Moisture sensor for a windshield

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters

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318483, 324690, B60S 1108

Patent

active

058015396

ABSTRACT:
A moisture sensor has two spaced main electrodes which are arranged on the outer side of the windshield of a motor vehicle in a region which is passed over by the windshield wiper and are connected to an evaluation circuit for the determination of resistance as a function of a degree of moisture. In order to improve the precision of the measurement results supplied by the moisture sensor, an auxiliary electrode is arranged between the two main electrodes outside a region passed over by the wiper in order to determine a shunt resistance formed by residues on the windshield and/or in the region of a windshield gasket covering. The main electrodes and the auxiliary electrode lead to an evaluation circuit.

REFERENCES:
patent: 2907841 (1959-10-01), Campbell
patent: 4827198 (1989-05-01), Mueller et al.
patent: 5057754 (1991-10-01), Bell
patent: 5304936 (1994-04-01), Buschur
patent: 5306992 (1994-04-01), Droge
patent: 5317252 (1994-05-01), Kranbuehl
patent: 5331287 (1994-07-01), Yamagishi et al.
patent: 5459380 (1995-10-01), Augustinowicz
patent: 5668478 (1997-09-01), Buschur

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