Air bag starter and backup circuit used therein

Details Air bag starter and backup circuit used therein Air bag starter and backup circuit used therein

2006-05-23

2006-05-23

Ilan, Ruth (Department: 3616)

Land vehicles

Wheeled

Attachment

C307S010100, C701S045000

Reexamination Certificate

active

07048303

ABSTRACT:
A mechanical acceleration switch acting in response to a collision involving a vehicle tends to occur with chattering, thereby lowering the reliability of operation due to insufficient application of an ignition current to an igniter of an air bag in the vehicle. When the mechanical acceleration switch is closed and first-stage igniters are ignited, a forced igniter is turned on. Even if chattering occurs in the mechanical acceleration switch, the first-stage igniters and a backup capacitor are conductively connected by turning on a driving transistor, such that an electric current is sufficiently delivered to the igniters. As a result, it is possible to improve the reliability of the operation of starting the air bag. Furthermore, it is no longer necessary to increase a capacity of the capacitor and change the constitution of the mechanical acceleration switch to decrease chattering therewith.

REFERENCES:
patent: 5460404 (1995-10-01), Damisch et al.
patent: 5657831 (1997-08-01), Furui
patent: 5801348 (1998-09-01), Asada
patent: 6628007 (2003-09-01), Baumgartner
patent: 6698791 (2004-03-01), Furui
patent: 9-211023 (1997-08-01), None

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