ATRIUM -- Architecting Under Uncertainty for ISO 26262 compliance

The ISO 26262 is currently the dominant standard for assuring functional safety of electrical and electronic systems in the automotive industry. The Functional Safety Concept (FSC) subphase in the standard requires the Preliminary Architectural Assumptions (PAA) for allocation of functional safety r...

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Bibliographic Details
Published in:arXiv.org 2019-12
Main Authors: Mohan, Naveen, Roos, Per, Svahn, Johan, Törngren, Martin, Sagar Behere
Format: Article
Language:English
Subjects:
Automation
Automobile industry
Automotive electronics
Automotive engineering
Case studies
Decision making
Electronic systems
Heavy vehicles
Industrial safety
Uncertainty
Online Access:Get full text
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Summary:The ISO 26262 is currently the dominant standard for assuring functional safety of electrical and electronic systems in the automotive industry. The Functional Safety Concept (FSC) subphase in the standard requires the Preliminary Architectural Assumptions (PAA) for allocation of functional safety requirements (FSRs). This paper justifies the need for, and defines a process ATRIUM, for consistent design of the PAA. ATRIUM is subsequently applied in an industrial case study for a function enabling highly automated driving at one of the largest heavy vehicle manufacturers in Europe, Scania CV AB. The findings from this study, which contributed to ATRIUM's institutionalization at Scania, are presented. The benefits of the proposed process include (i) a fast and flexible way to refine the PAA, and a framework to (ii) incorporate information from legacy systems into safety design and (iii) rigorously track and document the assumptions and rationale behind architectural decisions under uncertain information. The contributions of this paper are the (i) analysis of the problem (ii) the process ATRIUM and (iii) findings and the discussion from the case study at Scania. Keywords: ISO 26262, functional safety, automation, HCV, HGV, architectures, highly automated driving, ATRIUM, decision making, architecting, uncertainty management
ISSN:2331-8422
DOI:10.48550/arxiv.2001.00082