Rain sensor

Details Rain sensor Rain sensor

1986-06-27

1987-10-27

Shoop, Jr., William M.

Electricity: motive power systems

Automatic and/or with time-delay means

Moisture content or wetness

318444, 318DIG2, 15250C, B60S 108

Patent

active

047032375

ABSTRACT:
A rain sensor for selectively supplying power from a constantly available power source to a wiper means (14) to remove moisture from a vehicle window (12) when moisture has collected. A passive circuit (18) is supported on the window (12) and has an initial self-resonant frequency to sense moisture. A generating means (20,120) creates an electromagnetic field having a range of frequencies wherein the initial self-resonant frequency is within the range of frequencies. An moisture collects about the passive circuit (18), the resonant frequency of the passive circuit (18) shifts away from the initial self-resonant frequency, indicative of less coupling with the generating means (20,20). A detector (28,128) detects the coupling between the passive circuit (18) and the generating means (20,120) to actuate the wiper means (14) by a control means (30,130) when a predetermined decoupling magnitude is exceeded.

REFERENCES:
patent: 2607828 (1952-08-01), Razek
patent: 4554493 (1985-11-01), Armstrong
patent: 4613802 (1986-09-01), Kraus et al.

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