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Crash Discrimination Algorithm with Two Crash Severity Levels Based on Seat-belt Status  

박서욱 (한국과학기술원 기계공학과)
이재협 (㈜현대 오토넷 Safety Electronics팀)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.11, no.2, 2003 , pp. 148-156 More about this Journal
Abstract
Many car manufacturers have frequently adopted an aggressive inflator and a lower threshold speed for airbag deployment in order to meet an injury requirement for unbolted occupant at high speed crash test. Consequently, today's occupant safety restraint system has a weakness due to an airbag induced injury at low speed crash event. This paper proposes a new crash algorithm to improve the weakness by suppressing airbag deployment at low speed crash event in case of belted condition. The proposed algorithm consists of two major blocks-crash severity algorithm and deployment logic block. The first block decides crash severity with two levels by means of velocity and crash energy calculation from acceleration signal. The second block implemented by simple AND/OR logic combines the crash severity level and seat belt status information to generate firing commands for airbag and belt pretensioner. Furthermore, it can be extended to adopt additional sensor information from passenger presence detection sensor and safing sensor. A simulation using real crash data for a 1,800cc passenger vehicle has been conducted to verify the performance of proposed algorithm.
Keywords
NCAP(New Car Assessment Program); Airbag-induced injury; Depowered airbag; Multi-stage inflator; Crash severity level; Required time-to-fire(R-TTF); Belt pretensioner; Deployment logic; Passenger presence detection sensor; Safing sensor;
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