Method and apparatus for testing an airbag restraint system with

Details Method and apparatus for testing an airbag restraint system with Method and apparatus for testing an airbag restraint system with

1991-04-09

1994-03-08

Swarthout, Brent

Communications: electrical

Land vehicle alarms or indicators

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

280735, 307 101, B60Q 100

Patent

active

052931536

ABSTRACT:
A method and apparatus are disclosed for testing an airbag restraint system of the type having at least two parallel connected inertia sensors connected in series with a squib across a source of electrical energy, each inertia sensor having a normally open switch and an associated parallel connected resistor. Each parallel connected inertia sensor has a series connected diode for isolating its associated inertia sensor circuit from other circuit components in the firing circuit. A microcontroller monitors at least one voltage value at a component connection while at least one parallel connected inertia sensor is isolated. The microcontroller determines a value functionally related to the resistance of at least one circuit component in the firing circuit while at least one parallel connected inertia sensor is isolated. The microcontroller compares the determined value against predetermined limits. If the determined value is not within the predetermined limits, an error indication is provided.

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