Apparatus for detecting the existence of an abnormality in a veh

Details Apparatus for detecting the existence of an abnormality in a veh Apparatus for detecting the existence of an abnormality in a veh

1991-04-15

1993-02-16

Gaffin, Jeffrey A.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

307 64, B60L 300

Patent

active

051873826

ABSTRACT:
A vehicle operator protection system capable of detecting abnormalities in an auxiliary power supply in the protection system. The auxiliary power supply comprises a backup capacitor which is part of a time constant circuit and is connected in parallel with an actuator for inflating an air bag. While the backup capacitor is charged, the voltage differences between an onboard battery and the backup capacitor are determined for a given period, and the determined value is divided by the amount that the voltage of the backup capacitor rises in the given period. An abnormality in the capacitance of the backup capacitor is determined in accordance with the divided value, and thus the abnormality of the capacitance of the backup capacitor can be detected accurately without being influenced by variation of voltage of the onboard battery.

REFERENCES:
patent: 4287431 (1981-09-01), Yasui et al.
patent: 4835513 (1989-05-01), McCurdy et al.
patent: 5045835 (1991-09-01), Masegi

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