Communications: electrical – Land vehicle alarms or indicators – Of collision or contact with external object
Patent
1996-07-01
1998-03-31
Swarthout, Brent A.
Communications: electrical
Land vehicle alarms or indicators
Of collision or contact with external object
340438, 280734, 307 101, B60Q 100
Patent
active
057343179
ABSTRACT:
An air bag deployment system (10) generates the proper current to activate a squib (74) and deploy an air bag. A separate capacitor (48) powers circuitry in a drive limit controller (54) for providing a variable voltage drive to a MOS device (68) to regulate squib (74) firing current. A switch circuit (38) supplies gate current to a transistor (46) such that an electrical connecting path allows a capacitor (22) to charge a capacitor (48). During squib (74) firing and air bag deployment, the switch circuit (38) provides electrical isolation between the decaying voltage stored on the capacitor (22) that powers the squib (74) current and the capacitor (48) that provides current regulation to the squib (74) from the drive limit controller (54).
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patent: 5101192 (1992-03-01), Ishizuka
patent: 5155376 (1992-10-01), Okano
patent: 5181011 (1993-01-01), Okano
patent: 5194755 (1993-03-01), Rhee et al.
patent: 5234228 (1993-08-01), Morota t al.
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patent: 5432385 (1995-07-01), Kincaid et al.
patent: 5554890 (1996-09-01), Kinoshita
Bennett Paul T.
Gray Randall C.
Dover Rennie William
Motorola Inc.
Swarthout Brent A.
Trieu Van T.
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