Method and apparatus for diagnosing shorts in a SIR system

Details Method and apparatus for diagnosing shorts in a SIR system Method and apparatus for diagnosing shorts in a SIR system

1994-03-10

1995-10-17

Peng, John K.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340514, 340649, 340650, 340662, 340663, 280735, B60Q 100

Patent

active

054594499

ABSTRACT:
Air bags are deployed by firing circuits each containing a squib in series with a common control switch, and a control containing an accelerometer and a microprocessor for operating the switch to deploy the air bags. To diagnose shorts, a current source feeds a trickle current through each squib and a current limited voltage regulator across the switch passes the combined trickle currents to ground. The microprocessor senses the voltage across the switch via an A/D converter. That voltage goes low for a short to ground and high for a short to battery voltage.

REFERENCES:
patent: 4243971 (1981-01-01), Suchowerskyj et al.
patent: 5155376 (1992-10-01), Okano

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