Due to the rising complexity of automotive Electric/Electronic embedded systems, Functional Safety becomes a main issue in the automotive industry. This issue has been formalized by the introduction of the ISO 26262 standard for functional safety in 2011. The challenges are, on the one hand to design safe systems based on a systematic verification and validation approach, and on the other hand, the fulfilment of the requirements of the ISO 26262 standard. Following ISO 26262 recommendations, our approach, based on fault injection, aims at verifying fault tolerance mechanisms and non-functional requirements at all steps of the development cycle, from early design phases down to implementation. Fault injection is a verification technique that has been investigated for a long time. However, the role of fault injection during design phase and its complementarities with the experimental validation of the target have not been explored. In this work, we investigate a fault injection continuum, from system design validation to experiments on implemented targets. The proposed approach considers the safety analyses as a starting point, with the identification of safety mechanisms and safety requirements, and goes down to the validation of the implementation of safety mechanisms through fault injection experiments. The whole approach is based on a key fault injection framework, called FARM (Fault, Activation, Readouts and Measures). We show that this approach can be integrated in the development process of the automotive embedded systems described in the ISO 26262 standard. Our approach is illustrated on an automotive case study: a Front-Light system.
展开▼
