Sensing moisture on screen and automated controlled wiping

Details Sensing moisture on screen and automated controlled wiping Sensing moisture on screen and automated controlled wiping

B - Operations, Transporting

60

S

B60S 1/02 (2006.01) B60S 1/08 (2006.01) G01N 21/43 (2006.01)

Patent

CA 2065298

Water (3) on the outside surface (1) of a vehicle windscreen (7) causes a light beam (5) to be partially transmitted through screen (7), while a clean screen (7) provides substantially total internal reflection of beam (5). This difference is detected by light sensor (6). The presence of water is used initially to trigger the windscreen wipers and once activated, the characteristics of the signal from sensor (6) received during one wiper action are used to set the characteristics of the next wiper action, e.g. time delay, or wiper blade speed. The light beam (5) is an infra-red light.

La présence d'eau (3) sur la surface externe (1) du pare-brise (7) d'un véhicule déclenche la transmission partielle d'un faisceau lumineux (5) à travers le pare-brise (7), tandis qu'un pare-brise sec (7) permet une réflexion interne sensiblement totale du faisceau (5). Cette différence est détectée par un capteur de lumière (6). La présence d'eau est utilisée initialement pour mettre en route les essuie-glaces du pare-brise et, ces derniers ayant été activés, les caractéristiques du signal provenant du capteur (6) et reçu pendant une première action des essuies-glace sont utilisées pour déterminer les caractéristiques de l'action suivante des essuie-glaces, telles que temporisation ou vitesse des balais d'essuie-glaces. Le faisceau (5) est un rayon infra-rouge.

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