A Generic Method for a Bottom-Up ASIL Decomposition [chapter]

Alessandro Frigerio, Bart Vermeulen, Kees Goossens
2018 Lecture Notes in Computer Science  
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 bottomup ASIL
more » ... composition, 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.
doi:10.1007/978-3-319-99130-6_2 fatcat:6gqyiy3t6fh2thk7jgnqcjbawy