A main challenge when developing next generation architectures for automated driving ECUs is to guarantee reliable functionality. Today’s fail safe systems will not be able to handle electronic failures due to the missing “mechanical” fallback or the intervening driver. This means, fail operational based on redundancy is an essential part for improving the functional safety, especially in safety-related braking and steering systems. The 2-out-of-2 Diagnostic Fail Safe (2oo2DFS) system is a promising approach to realize redundancy with manageable costs. In this contribution, we evaluate the reliability of this concept for a symmetric and an asymmetric Electronic Power Steering (EPS) ECU. For this, we use a Markov chain model as a typical method for analyzing the reliability and Mean Time To Failure (MTTF) in majority redundancy approaches. As a basis, the failure rates of the used components and the microcontroller are considered. The comparison to a non-redundant system shows a significantly higher reliability and MTTF of the redundant approaches.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Markov Chain-based Reliability Analysis for Automotive Fail-Operational Systems


    Additional title:

    Sae Int. J. Trans. Safety


    Contributors:

    Conference:

    WCX™ 17: SAE World Congress Experience ; 2017



    Publication date :

    2017-03-28


    Size :

    9 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Markov Chain-based Reliability Analysis for Automotive Fail-Operational Systems

    Kohn, Andre / Schneider, Rolf / Vilela, Antonio et al. | British Library Conference Proceedings | 2017


    Architectural Concepts for Fail-Operational Automotive Systems

    Kohn, Andre / Roger, Andre / Vilela, Antonio et al. | SAE Technical Papers | 2016


    Architectural concepts for fail-operational automotive systems

    Kohn,A. / Schneider,R. / Vilela,A. et al. | Automotive engineering | 2016


    Architectural Concepts for Fail-Operational Automotive Systems

    Kohn, Andre / Schneider, Rolf / Vilela, Antonio et al. | British Library Conference Proceedings | 2016