Fault diagnosis apparatus for control circuit of vehicle passeng

Land vehicles – Wheeled – Attachment

Patent

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Details

36442403, 340436, 371 251, B60R 2132

Patent

active

054092582

ABSTRACT:
A fault diagnosis apparatus for diagnosing a control circuit comprising a squib that activates an air bag or the like, a first and a second switching element for activating the squib, and a collision judging circuit that turns on the first and the second switching elements upon detecting an impact in excess of a predetermined level. A microcomputer included in the apparatus generates a signal that turns on either of the two switching elements. The voltage between the activated switching element and the squib is then detected and compared by the microcomputer with the voltage in normal operation for fault diagnosis.

REFERENCES:
patent: 3633016 (1972-01-01), Walker et al.
patent: 3818431 (1974-06-01), Hosaka
patent: 5112080 (1992-05-01), Okano
patent: 5166880 (1992-11-01), Furui
patent: 5182459 (1993-01-01), Okano et al.
patent: 5283472 (1974-02-01), Takeuchi

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