Vehicle occupant weight estimation apparatus having fluid-filled

Details Vehicle occupant weight estimation apparatus having fluid-filled Vehicle occupant weight estimation apparatus having fluid-filled

1997-09-03

1999-11-16

Louis-Jacques, Jacques H.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle subsystem or accessory control

701 49, 701 36, 280735, 340436, 340665, 340667, 180271, B60R 2132, G06G 776

Patent

active

059873701

ABSTRACT:
An improved weight estimation apparatus includes a closed elastomeric bladder filled with fluid and installed in the foam cushion of a vehicle seat bottom, with at least one pressure sensor installed in a closed exit port of the bladder. A temperature sensor disposed in proximity to the bladder provides a temperature signal, and a controller estimates the weight of the occupant based on the temperature and pressure signals. The pressure sensor is preferably configured to sense the gage pressure--that is, the differential pressure between the fluid and atmospheric pressure--at the center of gravity of the fluid in order to provide a stable output independent of changing atmospheric pressure and changing orientation of the bladder due to vehicle pitch and roll.

REFERENCES:
patent: 5474327 (1995-12-01), Schousek
patent: 5566976 (1996-10-01), Cuevas
patent: 5573269 (1996-11-01), Gentry et al.
patent: 5626359 (1997-05-01), Steffens, Jr. et al.
patent: 5658050 (1997-08-01), Lorbiecki
patent: 5739757 (1998-04-01), Gioutsos
patent: 5820162 (1998-10-01), Fink
patent: 5877677 (1999-03-01), Fleming et al.

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