Method for releasing an airbag in a motor vehicle
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United States of America Patent
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-
Aug 29, 1995
Grant Date -
N/A
app pub date -
Sep 9, 1994
filing date -
Sep 9, 1993
priority date (Note) -
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Abstract
A method and system for releasing an airbag in a motor vehicle utilizes an acceleration signal which is measured and processed for the formation of a release criterion. An impact causes an initial increase in the release readiness, which is cancelled after a short period of time if no release has taken place up to that time. In particular in the case of impact processes with moderate acceleration values, such as for example in an offset pole crash, there is the risk that the airbag is released so late that an occupant who has already been substantially displaced forwards towards the steering wheel is additionally endangered by the explosive opening of the airbag. The cancellation of the increased release readiness is controlled by a state variable which corresponds to the forward displacement of an occupant and is obtained by double integration from the acceleration signal with respect to time. The cancellation takes place when the forward displacement exceeds a critical value.
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