This paper deals with the design and validation, through simulation in a Matlab/Simulink and SABER (software for mixed-technology system simulation) environment, of model-based diagnostic algorithms for an automotive EPGS (electric power generation system). The EPGS includes alternator with rectifier, a battery, and a voltage regulator. The mathematic models of these subsystems, based on the physics of the processes involved, consist of time-varying nonlinear ODEs (open dynamics engines). The diagnostic problem focuses on the detection and isolation of a specific set of alternator faults, including belt slipping, rectifier fault and voltage regulator fault. An in-depth analysis of the models is conducted in order to understand the effects of different failure modes on system performance; subsequently, an equivalent input-output model of the alternator is formulated and parameterized. The equivalent model permits considerable simplification of the algorithms. The proposed diagnostic approach is based on the generation of residuals obtained using system models and comparing the predicted and measured value of selected variables, including alternator output current, field voltage, battery current, battery voltage and battery temperature. This paper presents the models, diagnostic algorithms and simulation results.


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    Title :

    Model-based fault detection and isolation in automotive electrical systems


    Additional title:

    Fehlererkennung und Fehlereingrenzung in der Kraftfahrzeugelektrik auf der Grundlage von Modellen


    Contributors:


    Publication date :

    2006


    Size :

    10 Seiten, 16 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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