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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Acknowledgements
The work in this paper is supported by TU/e Impuls program, a strategic cooperation between NXP Semiconductors and Eindhoven University of Technology. The authors thank all reviewers for their helpful comments and suggestions that helped improve and clarify this paper.
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Frigerio, A., Vermeulen, B., Goossens, K. (2018). A Generic Method for a Bottom-Up ASIL Decomposition. In: Gallina, B., Skavhaug, A., Bitsch, F. (eds) Computer Safety, Reliability, and Security. SAFECOMP 2018. Lecture Notes in Computer Science(), vol 11093. Springer, Cham. https://doi.org/10.1007/978-3-319-99130-6_2
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