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Influence des fautes transitoires et des performances temps réel sur la sûreté des systèmes X-by-Wire

Abstract : Introduction of X-by-Wire embedded systems in automotive is a source of new and specific problems for the respect of dependability requirements. They are implemented without the mechanical redundancy necessary to provide a minimal service in case of dysfunction of the electronic components. These systems are particularly sensible to ECM perturbations, and each transient fault can eventually be the cause of a catastrophic failure. ln this context, the work presented in this document is of methodological order. ln particular, we propose a method for the verification of real-time constraints in nominal mode (non perturbed mode), and a method for quantitative prevision of faults that measures the influence of transient faults due to environ ment and real-time performance on the safety (in term of probability of failure per perturbed zone) of this system. These works have been applied to Steer-by-Wire systems, but evaluation methods proposed in the document are generic. The respect of safety requirement (e.g.: 1.10-9 failure per functioning hour) is th en completed by the evaluation of the behavioral reliability. As this technique gives quantitative results, we can realize a few sensitivity analysis, like, for example, the measurement of the influence of the duration of the communication cycle for TDMA communications, the influence of the diversification in the redundancy of the subsystems, or the influence fault tolerance mechanisms proposed by TTP/C and FlexRay.
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  • HAL Id : tel-01750004, version 1



Cédric Wilwert. Influence des fautes transitoires et des performances temps réel sur la sûreté des systèmes X-by-Wire. Autre [cs.OH]. Institut National Polytechnique de Lorraine, 2005. Français. ⟨NNT : 2005INPL023N⟩. ⟨tel-01750004⟩



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