Fault detection method and apparatus for air bag activation devi

Details Fault detection method and apparatus for air bag activation devi Fault detection method and apparatus for air bag activation devi

1994-10-21

1996-03-26

Focarino, Margaret A.

Land vehicles

Wheeled

Attachment

340438, 307 101, B60R 2132

Patent

active

055014860

ABSTRACT:
An air bag activation device for a vehicle air bag system eliminates the need to feed a small test current during the standby state so that the power consumption is minimized, and detects faults of the air bag activating device accurately even if the battery voltage fluctuates, and prevents the air bag from expanding erroneously. The device bases the fault detection on the calculation of the difference between an amplified voltage when a small constant current is fed to the air bag activating device from a constant current circuit, and an amplified voltage in the absence of the current.

REFERENCES:
patent: 4287431 (1981-09-01), Yasui et al.
patent: 4825148 (1989-04-01), McCurdy et al.
patent: 4956631 (1990-09-01), Itoh
patent: 5081442 (1992-01-01), Ito et al.
patent: 5135254 (1992-08-01), Masegi et al.
patent: 5166880 (1992-11-01), Furui

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