Circuit arrangement for evaluating an acceleration sensor signal

Details Circuit arrangement for evaluating an acceleration sensor signal Circuit arrangement for evaluating an acceleration sensor signal

1995-11-03

1997-06-10

Williams, Hezron E.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

G01P 15125

Patent

active

056377983

ABSTRACT:
The invention is a circuit arrangement for evaluating a capacitive signal from an acceleration sensor, in which an acceleration-dependent capacitance change is evaluated by measuring the voltage at the oscillator. After each voltage change, the charge of the two capacitor elements of a differential capacitor is neutralized by applying a predetermined voltage, preferably the operating voltage. When a new acceleration occurs, a voltage difference relative to the predetermined voltage is again determined. The voltage difference is converted into a pulse-width modulated signal and is used for supplying the two capacitor elements of the acceleration sensor. The circuit arrangement is preferably usable for activating an air bag in a motor vehicle.

REFERENCES:
patent: 5345824 (1994-09-01), Sherman
patent: 5417312 (1995-05-01), Tsuchitani

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