Releasing circuit and checking circuit for a motor vehicle safet

Details Releasing circuit and checking circuit for a motor vehicle safet Releasing circuit and checking circuit for a motor vehicle safet

1982-02-03

1983-10-18

Trafton, David L.

Communications: electrical

Selective

Having indication or alarm

180274, 280735, 340 61, 340669, B60R 2108

Patent

active

044108753

ABSTRACT:
The invention relates to a releasing circuit for a motor vehicle safety device having a piezoelectric acceleration sensor for delivering a signal which corresponds to the sudden deceleration of a motor vehicle when it collides with an obstacle. An evaluating circuit evaluates the output signal of the acceleration sensors. A switch releases the safety device through an ignition element starting from a predetermined release value of the output signal of the evaluating circuit. A checking circuit for the releasing circuit has a check pulse generator for delivering check pulses which are fed to the releasing circuit. The checking circuit, in addition to the check pulse generator 11, is connected to a reference pulse generator 12 that provides reference pulses which assume characteristic values in accordance with the check pulses which are evaluated in the releasing circuit. A comparator 17 connected to the error indication 22 compares the evaluated check pulses and the reference pulses.

REFERENCES:
patent: 3622974 (1971-11-01), Best et al.
patent: 3629816 (1971-12-01), Gillund
patent: 3851305 (1974-11-01), Baba et al.
patent: 3911391 (1975-10-01), Held et al.
patent: 4087782 (1978-05-01), Oishi et al.

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