Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1989-10-02
1990-12-25
Pellinen, A. D.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
180282, 280735, B60R 2132
Patent
active
049805738
ABSTRACT:
A firing circuit for deploying a pair of air bags comprises two circuit legs connected in parallel across a voltage supply. Each circuit leg comprises in series a safing sensor, a squib, and a crash sensor, with each sensor being shunted by a like resistor having a nominal resistance substantially greater than the nominal resistance of the squibs. A first diode bridge comprising a pair of oppositely-biased diodes extends between a first pair of junctions on the circuit legs located between the safing sensors and the squibs thereof. A second diode bridge comprising a pair of oppositely-biased diodes extends between a second pair of junctions on the circuit legs located between the squibs and the crash sensors thereof. A third diode bridge comprising oppositely-biased diodes connected in series also extends between the latter pair of junctions on the circuit legs. A third crash sensor connects a junction on the third diode bridge between the diodes thereof with both circuit legs, respectively, so as to be placed in parallel with the crash sensors thereof. The diode bridges provide multiple firing paths for both squibs to ensure deployment of both air bags upon simultaneous closure of either safing sensor and any crash sensor. Full circuit diagnosability is achieved through a comparison of the voltages achieved about the circuit and the effects thereon of incrementing the supply voltage and/or the operation of a plurality of current drains connected about the circuit.
REFERENCES:
patent: 3871472 (1975-03-01), Hosaka et al.
patent: 4359715 (1982-11-01), Langer et al.
patent: 4381829 (1983-05-01), Montaron
patent: 4804859 (1989-02-01), Swart
patent: 4851705 (1989-07-01), Musser et al.
patent: 4893109 (1990-01-01), Vrabel et al.
patent: 4933570 (1990-06-01), Swart et al.
Messer Kevin E.
White Craig W.
Automotive Systems Laboratory Inc.
Elms Richard
Pellinen A. D.
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