Method and device for diagnosing gas sensor degradation

G - Physics – 01 – N

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G01N 37/00 (2006.01) G01N 27/16 (2006.01) G01N 31/10 (2006.01) H01M 8/04 (2006.01) B60K 35/00 (2006.01)

Patent

CA 2485604

A method for diagnosing deterioration of a gas sensor, e.g. a hydrogen sensor, easily. The hydrogen sensor comprises a reference detection element and a normal detection element each comprising a pair of detection element and temperature compensation element, wherein the normal detection element is normally conducted in order to detect concentration of hydrogen gas. At the time of diagnosing deterioration of the normal detection element, both the normal detection element and the reference detection element are conducted in order to detect the concentration of a gas having a specified hydrogen concentration simultaneously and then an output from the normal detection element is compared with an output from the reference detection element.

L'invention concerne une méthode de diagnostic facile de détérioration d'un capteur de gaz, comme par exemple un capteur d'hydrogène. Ledit capteur d'hydrogène comprend un élément de détection de référence et un élément de détection normale, comportant chacun une paire formée d'un élément de détection normale et d'un élément de compensation de température, l'élément de détection normale étant commandé normalement pour la détection de la concentration d'hydrogène gazeux. Au moment du diagnostic de détérioration de l'élément de détection normale, l'élément de détection normale et l'élément de détection de référence sont commandés de sorte qu'ils détectent simultanément la concentration de gaz possédant une concentration d'hydrogène spécifiée, la sortie de l'élément de détection normale étant ensuite comparée à la sortie de l'élément de détection de référence.

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