Citation

Takeichi M, Suyama K, Sato Y. Trans. Soc. Automot. Eng. Jpn. 2013; 44(2): 627-633.

Copyright

(Copyright © 2013, Society of Automotive Engineers of Japan)

DOI

10.11351/jsaeronbun.44.627

PMID

unavailable

Abstract

The present paper provides how to assess functional safety of an item of air bag system for automobiles based on IEC 61508 and ISO 26262. Firstly, it is shown that the item should tackle the reciprocal hazards of fail-to-open and fail-to-keep closing and the item be composed of 2-out-of-2 and 1-out-of-2 system-architectures for the hazards. Next, relationships between fault-modes of the item and their influences on the hazards are explored in order to construct logic models to describe the causation of hazardous events, and the hazardous event rates are formulated using the constructed causation logic models. Then, the paper discusses the relationships between parameters like failure rates of the item, β-factors concerning common-cause failures, diagnostic coverage, fault modes rates, repair rates, hazardous event rates, demand and completion rates, as well as ASIL architecture metrics. Thus, it is concluded that the approach of the paper will be able to be applied to other issues of reciprocal hazards to put ISO 26262 into practice.

Language: ja

Keywords

Air Bag System; ASIL; Functional Safety; ISO26262; Passive Safety; Reciprocal Hazards