Method and apparatus for testing a dual airbag passive restraint

Details Method and apparatus for testing a dual airbag passive restraint Method and apparatus for testing a dual airbag passive restraint

1990-09-27

1993-02-16

Ng, Jin F.

Communications: electrical

Land vehicle alarms or indicators

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

307 101, 280735, B60Q 100

Patent

active

051874652

ABSTRACT:
A method and apparatus are disclosed for testing a dual airbag passive restraint system of the type having two firing circuits, each with a series connection of several circuit components including at least two 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. The apparatus comprises a series connected diode and two switching circuits for each firing circuit for isolating at least one of the inertia sensors in each of the firing circuits from other circuit components of its associated firing circuit. A microcontroller monitors at least one voltage value at a component connection while at least one inertia sensor in each firing circuit is isolated. The microcontroller determines a value functionally related to the resistance of at least one circuit component in each firing circuit while at least one 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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