Washer fluid monitor

Details Washer fluid monitor Washer fluid monitor

1989-10-13

1990-08-28

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

73304C, 73304R, 361284, G08B 2100, H01G 528

Patent

active

049529145

ABSTRACT:
A washer fluid monitor comprising a pair of electrically conducting probes projecting downward into a washer fluid reservoir and incorporated into part of the positive feedback loop of a Wien bridge oscillator. One of the probes is grounded; and the Wien bridge oscillator is modified with an additional capacitor isolating the other probe from the DC supply and intermediate voltages so that it is essentially grounded at the oscillator frequency to greatly reduce or eliminate ionic currents in the washer fluid and resulting probe degradation without the need for an isolating transformer.

REFERENCES:
patent: 3254333 (1966-05-01), Baumoel
patent: 3694804 (1972-09-01), Hill
patent: 3918306 (1975-11-01), Maltby
patent: 4110740 (1978-08-01), Akita et al.
patent: 4165509 (1979-08-01), Betts et al.

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