Firing circuit

Details Firing circuit Firing circuit

B - Operations, Transporting

60

R

342/47

B60R 21/01 (2006.01)

Patent

CA 2020324

ABSTRACT A firing circuit for deploying a pair of air bags comprises four circuit legs connected in parallel across a voltage supply via a diode shunted with a resistor. The first and second circuit legs each comprise in series a safing sensor, a squib, and a crash sensor, with each sensor being shunted by a like resistor whose resistance is substantially greater than the nominal resistance of the squibs. The third and fourth circuit legs each preferably comprise a resistor in series with a capacitor, with the resistance of the series resistor being significantly greater than that of the resistor shunting the grounded diode. Five bridges interconnect the four circuit legs so as to provide multiple firing paths and continued circuit viability notwithstanding the presence of one or more "faults" in the instant firing circuit. The addition, for example, of voltage detecting and comparing means about the four circuit legs, diodes and/or current-limiting devices in the bridges between the circuit legs further, and means operative to draw current from a junction on the first and second circuit legs, respectively, renders the instant firing circuit fully diagnosable in situ.

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