Fault diagnosis device for passenger protection apparatus

Details Fault diagnosis device for passenger protection apparatus Fault diagnosis device for passenger protection apparatus

1995-06-02

1997-04-15

Wieder, Kenneth A.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

In an ignitor or detonator

324550, 280735, B60R 2132

Patent

active

056213263

ABSTRACT:
A passenger protection apparatus is provided with a plurality of squibs (activating elements). Transistors are respectively connected in series to these squibs. By switching on these transistors at predetermined differing timing, first monitor currents are conducted via current-controlling resistors to the respective squibs. First monitor currents can be independently conducted to the respective squibs with this structure. For this reason, the voltage levels generated at the squibs by the first monitor currents can be enlarged. Resistance values of the respective squibs can be calculated with high accuracy from these voltage values.

REFERENCES:
patent: 4287431 (1981-09-01), Yasui et al.
patent: 4835513 (1989-05-01), McCurdy
patent: 4893109 (1990-01-01), Vrabel
patent: 4956631 (1990-09-01), Itoh
patent: 4990884 (1991-02-01), McCurdy
patent: 5268643 (1993-12-01), Aso et al.

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