Vehicle seat sensor having self-maintaining air bladder

Details Vehicle seat sensor having self-maintaining air bladder Vehicle seat sensor having self-maintaining air bladder

G - Physics

01

G

G01G 5/04 (2006.01) G01G 19/414 (2006.01) B60R 21/01 (2006.01)

Patent

CA 2274225

A hydrostatic weight sensor element (10) with a pressure sensor (24) for detecting weight applied to a fluid filled load supporting bladder (12) has a volume restorer (32) for re-expanding the load supporting bladder (12) when the load is removed, and a check valve (34) that readmits a sensing fluid, such as air, into the bladder (12) when the internal pressure drops lower than the ambient air pressure. The volume restorer (32) is shaped so that the amount of fluid admitted (28) is less than the volume capacity of the sensor element. A pressure relief valve (42) is provided for overload conditions.

L'invention concerne un élément (10) capteur hydrostatique de poids muni d'un capteur (24) de pression pour la détection de poids appliqué à une vessie (12) porteuse de charge, remplie de fluide et pourvue d'un restaurateur (32) de volume de façon à réagrandir ladite vessie (12) lorsque la charge est éliminée, et un clapet anti-retour (34) qui laisse pénétrer à nouveau un fluide de détection, tel que l'air, dans la vessie (12) lorsque la pression interne tombe au-dessous de la pression de l'air ambiant. Le restaurateur (32) de volume est conçu de manière à ce que la quantité de fluide admis (28) soit inférieure à la capacité en volume de l'élément capteur. Une soupape (42) de décharge est fournie pour les cas de surcharge.

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