Windshield wiper system with rain detector

Details Windshield wiper system with rain detector Windshield wiper system with rain detector

1990-06-11

1991-05-14

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

Moisture content or wetness

318480, 318443, 318DIG2, B60S 108

Patent

active

050159313

ABSTRACT:
In a windshield wiper system for vehicles, with which a rain detector is associated, the rain detector operates according to the principle of detection of the absorption by wet glass of light rays which are subjected to multiple total reflections within the windshield.
The detector comprises a plurality of non-directional light sources together with a plurality of sensors each of which receives the light from the various sources. The light sources are modulated at different frequencies, and the sensors are associated with demodulation circuits, such that more detailed and accurate information as to the nature of the reductions in transparency of the windshield is obtained. The windshield wiper system is then activated in the light of this detailed information.

REFERENCES:
patent: 4355271 (1982-10-01), Noack
patent: 4481450 (1984-11-01), Watanabe et al.
patent: 4859867 (1989-08-01), Larson et al.
patent: 4871917 (1989-10-01), O'Farrell et al.
patent: 4916374 (1990-04-01), Schierbeek et al.
Patent Abstracts of Japan, vol. 9, No. 220, Sep. 6, 85, JP-A-60 78844.
Patent Abstracts of Japan, vol. 10, No. 22, Jan. 28, 86, JP-A-60 174931.

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