Capacitive occupant presence detection apparatus for a...

Details Capacitive occupant presence detection apparatus for a... Capacitive occupant presence detection apparatus for a...

2007-03-13

2007-03-13

Wu, Daniel (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C701S045000

Reexamination Certificate

active

11044802

ABSTRACT:
An occupant presence detection apparatus detects a change in capacitance between upper and lower conductor plates disposed on or near upper and lower surfaces of a fluid-filled elastomeric seat bladder, and a semi-rigid mat disposed between the seat cushion and the bladder includes a peripheral cavity at least partially surrounding the upper conductor plate. When occupant weight applied to the seat cushion is transmitted to the bladder, it distends into the peripheral cavity of the semi-rigid mat, producing a significant reduction in the separation between the upper and lower conductor plates, and a corresponding significant increase in the detected capacitance. Once the bladder has fully distended into the cavity, additional loading due to increased occupant weight produces only a minimal further increase of the measured capacitance.

REFERENCES:
patent: 5987370 (1999-11-01), Murphy et al.
patent: 6101436 (2000-08-01), Fortune et al.
patent: 6246936 (2001-06-01), Murphy et al.
patent: 6356194 (2002-03-01), Fukui et al.
patent: 6490936 (2002-12-01), Fortune et al.
patent: 6918612 (2005-07-01), Smith et al.
patent: 2003/0005775 (2003-01-01), Washeleski et al.
patent: 2003/0009273 (2003-01-01), Stanley et al.
EP search report dated Apr. 13, 2006.

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