Apparatus for sensing occupant weight in an actuatable restraint system
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United States of America Patent
Stats
-
Jan 26, 1999
Grant Date -
N/A
app pub date -
Mar 21, 1996
filing date -
Mar 21, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus (10) for sensing weight of an occupant on a vehicle seat (36) in an occupant restraint system (10) includes variable inductance sensor (50) mounted in the seat (36) so that inductance of the sensor (50) is functionally related to the occupant's weight on the seat (36). A capacitor (98) is connected in parallel across the variable inductance sensor (50). The capacitor (98) and the variable inductance sensor (50) form a tank circuit (100). An oscillator (40) is operatively coupled to the tank circuit (100) for driving the tank circuit (100) into oscillation. A phase detector (94) monitors a phase shift between an output of said oscillator and oscillation of tank circuit. Weight on the seat is functionally related to the monitored phase shift.
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Family
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