Rain sensor with sigma-delta modulation and/or footprinting...

B - Operations – Transporting – 60 – S

Patent

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Details

B60S 1/08 (2006.01) G01N 27/22 (2006.01)

Patent

CA 2631542

A system and/or method for sensing the presence of moisture (e.g., rain) and/or other material(s) on a window such as a vehicle window (e.g., vehicle windshield, sunroof or backlite). In certain example embodiments of the invention, at least one sensing capacitor is supported by a window such as a vehicle windshield, the capacitor(s) having a field that is affected by moisture (e.g., rain) on a surface of the window. A sensing circuit outputs an analog signal that is based on and/or related to the capacitance(s) of the sensing capacitor(s). The analog output of the circuit may be converted to a digital signal via sigma-delta modulation, and subjected to processing (e.g., correlation) for determining whether moisture (e.g., rain, dew, fog, etc.) or the like is present on the surface of the window.

La présente invention concerne un système et/ou un procédé pour détecter la présence d'eau, de pluie notamment, et/ou d'autres matières sur une fenêtre, notamment d'automobile (pare-brise, toit ouvrant, lunette arrière...). Dans certains modes de réalisation particuliers de l'invention, au moins un condensateur de détection est supporté par une fenêtre, par exemple, un pare-brise d'automobile, de tels condensateurs comportant un champ affecté par l'eau, l'eau de pluie notamment, sur une surface de la fenêtre. Un circuit de détection produit en sortie un signal analogique qui se base sur, et/ou se rapporte à, l'une au moins des capacitaires des condensateurs de détection. La sortie analogique du circuit peut être convertie en un signal numérique par modulation en delta-sigma, et soumise à un traitement, notamment une corrélation, pour déterminer s'il y a de l'eau (pluie, rosée, brouillard...) ou analogue sur la surface de la fenêtre.

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