Robert Boschgmbh

Wolfgang Hermann

Henry Blitzke

Hans Meier

Hubert Lamm

Guenter Haderer

The device for the detection of a wetting of a pane of glass, has an optical rain sensor which detects extraneous light and evaluates it for purposes of day-night detection. The amount of light striking the receiver ( ) is integrated in an integration stage ( ) and supplied to a comparator stage ( ). The total light quantity formed by the light of a transmitter ( ) and extraneous light and the extraneous light quantity detected when the transmitter ( ) is switched off are measured in separate time intervals (Tg, Tf, Tf&prime;). The time interval (Tf, Tf&prime;) utilized for measurement of the extraneous light quantity is to be extended after a predeterminable number of measurement cycles (M) or after a predeterminable time period and/or the threshold (S ) is to be lowered for day-night detection.

Growing community of inventors

Freising, Germany

Wolfgang Hermann