Seat weight sensor having self-regulating fluid filled bladder

Details Seat weight sensor having self-regulating fluid filled bladder Seat weight sensor having self-regulating fluid filled bladder

1998-01-07

1999-11-09

Ellis, Christopher P.

Motor vehicles

With means for promoting safety of vehicle, its occupant or...

Responsive to absence or inattention of operator, or...

280735, B60K 2800

Patent

active

059795859

ABSTRACT:
A hydrostatic weight sensor incorporates a bladder having a plurality of cells in fluid communication with one another, and with the outlet of a check valve, the inlet of which is in fluid communication with a source of sensing fluid, preferably the atmosphere. Cell-filling and cell-evacuating restoring mechanisms are operatively coupled to respective portions of the cells of the bladder. When the applied load is removed from the hydrostatic weight sensor, the volume of those cells operatively coupled to the cell-filling and cell-evacuating restoring mechanisms are respectively restored and evacuated, whereupon if the pressure becomes less than the local atmospheric pressure, then fluid is added to the bladder through the check valve, thereby restoring lost sensing fluid. A pressure sensor operatively coupled to the bladder generates a signal responsive to the pressure of the sensing fluid within the bladder, and a signal processor calculates the weight of the occupant therefrom.

REFERENCES:
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patent: 4957286 (1990-09-01), Persons, II et al.
patent: 4987898 (1991-01-01), Sones
patent: 5232243 (1993-08-01), Blackburn et al.
patent: 5529377 (1996-06-01), Miller
patent: 5634685 (1997-06-01), Herring

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