Methodology to Model, Evaluate and Decompose Safety Architectures
SAE-PP-00379
02/26/2024
- Content
- The field of safety-critical automotive systems has seen considerable advancements in recent years, with more and more complex systems requiring robust and dependable architectures. This paper presents a structured methodology for modelling, evaluating and decomposing safety architectures, with the goal of increasing development efficiency and reducing the amount of design iterations. Fundamental choices about safety architectures are typically made early in the development cycle, however the ISO 26262 standard provides little guidance on how to actually make these choices. There is a fundamental risk involved in selecting an architecture (from a structural perspective), which in the end is not capable of meeting the expectations from the ISO 26262 standard. To begin, the proposed methodology incorporates a systematic approach for modeling and evaluating suitable safety architectures in an early stage of development. The proposed methodology leverages other standards to addresses weaknesses of the ISO 26262 standard. Through careful analysis and trade-off assessments, the methodology assists in identifying suitable safety architectures. Furthermore, the paper introduces a decomposition technique that enables the systematic breakdown of complex safety architectures in more manageable elements that can also be assigned various budgets, such as reliability and timing budgets. In summary, a methodology is proposed to: -Model (safety) architectures in a standardized way. -Evaluate safety architectures early on in the development process. -Assign budgets to elements in the architecture and break down these budgets in smaller portions that can be assigned to individual development teams.
- Citation
- Boon, F., Aelvoet, B., and de Jong, A., "Methodology to Model, Evaluate and Decompose Safety Architectures," SAE MobilityRxiv™ Preprint, submitted February 26, 2024, https://doi.org/10.47953/SAE-PP-00379.