Vorrichtung zum Erfassen einer Benetzung einer Scheibe

The invention relates to a device for detecting the wetness of a disc which has an optical rain sensor that detects extraneous light and evaluates it with regard to day-night recognition. In one stage of integration (16), the quantity of light falling on a detector (14) is integrated and sent to a c...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HERRMANN, WOLFGANG, 85354 FREISING, DE, MEIER, HANS, 77833 OTTERSWEIER, DE, HADERER, GUENTER, 77815 BUEHL, DE, BLITZKE, HENRY, 77815 BUEHL, DE, LAMM, HUBERT, 77876 KAPPELRODECK, DE
Format:	Patent
Sprache:	ger
Schlagworte:	INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING METEOROLOGY PERFORMING OPERATIONS PHYSICS SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, ORMANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR TESTING TRANSPORTING VEHICLES IN GENERAL
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Beschreibung
Zusammenfassung:	The invention relates to a device for detecting the wetness of a disc which has an optical rain sensor that detects extraneous light and evaluates it with regard to day-night recognition. In one stage of integration (16), the quantity of light falling on a detector (14) is integrated and sent to a comparator stage (20). The total light quantity composed of light from a transmitter (12) and possible extraneous light, and the extraneous light quantity detected when the transmitter (12) is disconnected, are measured in individual time intervals (Tg, Tf, Tf'). After a predetermined number of measuring cycles (M), or after a predetermined length of time, the time interval used to measure the extraneous light quantity can be extended, and/or the threshold (S2) can be lowered.