Misfire detection and monitoring on US passenger vehicles are required to comply with detailed and specific requirements contained in the OBD-II regulations. Numerous technical papers and patents discuss various methods and metrics for detecting misfire in conventional all-cylinder firing engines. However, the current methods are generally not suitable for detecting misfires in a dynamic skip fire engine. For example, a detection approach based on peak crankshaft angular acceleration may work well in conventional, all-cylinder firing engine operation, since it is expected that crankshaft acceleration will remain generally consistent for a given operating condition. In a skip fire engine, any cylinder or cycle may be skipped. As a result, the crankshaft acceleration peaks and profiles may change abruptly as the firing sequence changes. This paper presents two approaches for detecting misfires in a dynamic skip fire engine.The first method utilizes crankshaft angular acceleration with the addition of cylinder skip or fire status, which is used to recognize a firing sequence in order to ignore skips and apply a separate threshold to various sequences. For the second approach, a torque model based on multi-cylinder pressure modeling is employed. The paper describes the details in modeling cylinder pressure, indicated torque and crankshaft angular acceleration, and proposes a new metric for misfire detection. Validation tests are carried out both on an engine dynamometer and a vehicle under steady state and transient conditions. The results indicate a very promising approach for detecting misfires in a dynamic skip fire engine.


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    Titel :

    Misfire Detection in a Dynamic Skip Fire Engine


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:
    Van Ess, Joel (Autor:in) / Chien, Li-Chun (Autor:in) / Nagashima, Masaki (Autor:in) / Chen, S Kevin (Autor:in) / Hashemi, Sam (Autor:in)

    Kongress:

    SAE 2015 World Congress & Exhibition ; 2015


    Erschienen in:

    Erscheinungsdatum :

    14.04.2015


    Format / Umfang :

    10 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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