Abstract:
A frame-based occupant weight estimation apparatus for a vehicle seat (10) that is supported by two or more floor brackets (16, 18) secured to the vehicle floor (14) spans an open space (40) between the floor brackets (16, 18) to prevent shunting of the occupant weight through a foreign object (38) lying on the floor (14) between the floor brackets (16, 18). The weight estimation apparatus includes a fluid filled bladder (26) sandwiched between first and second rigid plates (22, 24), and is held in place between the seat frame (12) and the floor brackets (16, 18) by a set of fasteners (30). A spring (32/34) preloads the bladder (26) so that deviations of the bladder fluid pressure from the preload pressure will be indicative of occupant weight. The first plate (22) spans the open space (40) between the floor brackets (16, 18) so that the fluid pressure is indicative of occupant weight even in cases where a portion of the occupant weight is supported by a foreign object (38) disposed between the floor brackets (16, 18).