Weight detecting system for an occupant of a seat

Motor vehicles – With means for promoting safety of vehicle – its occupant or... – Responsive to absence or inattention of operator – or...

Reexamination Certificate

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Details

C280S735000, C177S144000, C177S211000

Reexamination Certificate

active

07100731

ABSTRACT:
A weight-detecting system for detecting the weight of an occupant sitting on a seat includes inner and outer weight-detecting units. The outer weight-detecting unit includes strain resistors mounted on a lower surface of its sensor plate. The inner weight-detecting unit includes strain resistors mounted on an upper surface of its sensor plate. When output voltages from the outer weight-detecting unit are represented by A and B, and output voltages from the inner weight-detecting unit are represented by C and D, the weight of an occupant is detected based on a value A+B+C′+D′ provided by adding output voltages C′ and D′ resulting from the inversion of the output voltages C and D to the output voltages A and B. The weight-detecting units have the same characteristic of change in output voltages with respect to change in temperature. Therefore, when the output voltage (A+B) is added to the output voltage (C′+D′), a detection error due to a change in temperature can be countervailed. Thus, the weight of the occupant sitting on a seat can be detected accurately without being influenced by the change in temperature.

REFERENCES:
patent: 3949822 (1976-04-01), English et al.
patent: 6039344 (2000-03-01), Mehney et al.
patent: 6407350 (2002-06-01), Blakesley
patent: 6841741 (2005-01-01), Kajiyama
patent: 09-257601 (1997-10-01), None
patent: 2002-160571 (2004-06-01), None
patent: 2004-205410 (2004-07-01), None

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