The goal of this work is to show the advantages of functional simulation in early design stages for the evaluation of safety concepts. Hence, we described project experiences made on the OEM side during the system safety analysis and evaluation by applying a functional simulation tool chain. One presented benefit of the introduction of functional simulation is the enhanced communication between the involved parties the OEM and supplier. Furthermore, the automotive manufacturer is enabled to conduct a functional safety analysis on a regular basis, also taking into account frequent incremental changes in more dynamic development stages. In addition to the communication enhancement the concurrence of FMEA and safety simulation through the integration of the failure catalogue and the derivation of simulation scenarios allows possible failures effects to be displayed and observed earlier in the development process. The interaction between static safety analysis and functional simulation has not been fathomed in a sufficient way. Future work will be concentrated on the impact analysis of failure simulation as well as the relation between FMEA and failure exploration. Another issue to be examined will be the efficient use and reuse of the system safety model in early phases and subsequent development stages. The foundation of our simulation chain comprises a functional model build of with Simulink. Simulink is a state-of-the-art tool employed in the automotive development for the modelling of functional behaviour of different ECUs (electronic control unit). The usage of this functional model inside a simulation in order to validate or evaluate system behaviour is commonly called MiL (Model in the Loop) where functions as well as the systems environment are simulated. In order to be able to easily display and manipulate parameter values of the MATLAB/Simulink models, we use Control Desk as the graphical add-on. Both Simulink and Control Desk are an integral part of our model-in-the-loop simulation. Based on the experience made, we extended the input and output interfaces of both tools. The input interface is adapted to read Excel files containing simulation scenarios which will be explained further on. The output interface allows us to report the results of our simulation.


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    Title :

    Simulation-driven functional safety evaluation of embedded automotive systems


    Contributors:


    Publication date :

    2008


    Size :

    11 Seiten, 4 Bilder, 5 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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