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2018 | OriginalPaper | Chapter

A Generic Method for a Bottom-Up ASIL Decomposition

Authors : Alessandro Frigerio, Bart Vermeulen, Kees Goossens

Published in: Computer Safety, Reliability, and Security

Publisher: Springer International Publishing

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Abstract

Automotive Safety Integrity Level (ASIL) decomposition is a technique presented in the ISO 26262: Road Vehicles - Functional Safety standard. Its purpose is to satisfy safety-critical requirements by decomposing them into less critical ones. This procedure requires a system-level validation, and the elements of the architecture to which the decomposed requirements are allocated must be analyzed in terms of Common-Cause Faults (CCF). In this work, we present a generic method for a bottom-up ASIL decomposition, which can be used during the development of a new product. The system architecture is described in a three-layer model, from which fault trees are generated, formed by the application, resource, and physical layers and their mappings. A CCF analysis is performed on the fault trees to verify the absence of possible common faults between the redundant elements and to validate the ASIL decomposition.
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Metadata
Title
A Generic Method for a Bottom-Up ASIL Decomposition
Authors
Alessandro Frigerio
Bart Vermeulen
Kees Goossens
Copyright Year
2018
DOI
https://doi.org/10.1007/978-3-319-99130-6_2

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