The objective of this work is to investigate a dual stage pyrotechnic gas generator used to stage the inflator of an airbag in a vehicle occupant restraint system. Dual stage pyrotechnic inflators were made through the use of two combustion chambers in either isolation or the second combustion chamber being within the first combustion chamber. Deployment modes may involve deployment of both stages at once or the first followed by the secondary at some later time to provide the desired gas delivery event. The investigation of a two-stage module containing two squibs and boosters showed a broad variety of pressure-time curves achievable by time delayed initiation. A theoretical model and computer code are developed for the dual stage pyrotechnic inflator. The calculated results and experimental data of pressure-time histories of the first and second combustion chambers and discharge tank are reported. The model can be utilized to study the effect of chamber volume ratio, gas generant loads, igniter delay time and parameters on the pressure-time histories of the dual stage inflator. The improved dual stage inflator developed was compared to other products and was found to be more suitable to eliminate the autoignition of the second combustion chamber from the first combustion.
Dual stage pyrotechnic inflator
Zweistufiger pyrotechnischer Gasgenerator
17 Seiten, 13 Bilder, 4 Quellen
Conference paper
English
Dual stage pyrotechnic inflator
Automotive engineering | 2002
|Dual Stage Pyrotechnic Inflator
British Library Conference Proceedings | 2002
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