Seat weight sensor having fluid filled bladder

Details Seat weight sensor having fluid filled bladder Seat weight sensor having fluid filled bladder

B - Operations, Transporting

60

N

B60N 2/24 (2006.01) B60R 21/32 (1995.01)

Patent

CA 2245662

A seat weight sensor (10) incorporates a fluid filled bladder (12) placed in series with the load path in the seat (3), whereby a load applied to and distributed across the bladder (12) increases the pressure of the fluid therein. The pressure of the fluid is measured by a pressure sensor (20) and is substantially proportional to the magnitude of the applied load, and substantially inversely proportional to the supported area of the bladder (12). The output signal is substantially linear with respect to weight. Preferably, the amount of fluid in the bladder should be less than the capacity of the bladder when the bladder is unloaded. The seat weight sensor (10) is incorporated into an accupant restraint system (7) for controlling the safety restraint system responsive to the weight of the occupant (5).

Un capteur de poids pour siège (10) se compose d'un poche remplie de fluide (12) montée en série avec la trajectoire de la charge dans le siège (3), une charge appliquée et répartie sur la poche (12) augmentant la pression du fluide contenu dans ladite poche. La pression du fluide est mesurée par un capteur de pression (20) et est sensiblement proportionnelle à la grandeur de la charge appliquée et sensiblement inversement proportionnelle à la zone de soutien de la poche (12). Le signal de sortie est sensiblement linéaire en ce qui concerne le poids. De préférence, la quantité de fluide dans la poche devrait être inférieure à la capacité de la poche lorsqu'elle est sans charge. Le capteur de poids pour siège (10) est incorporé à un système de retenue (7) de l'occupant, cela pour que ledit système de sécurité soit commandé en fonction du poids de l'occupant (5).

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