This paper examines three strategies of detecting knock that are less dependent of engine noise. The first strategy uses the exhaust temperature, the second uses a dithering method (systematically advancing and retarding the timing), while the third uses the standard deviation of knock intensity as the indicator of knock intensity.The first strategy proves to be difficult to detect knock since the exhaust temperature is strongly dependent on the combustion efficiency instead of knock intensity. The second strategy uses a conventional accelerometer but discriminates against mechanical noise by subtracting the knock intensity during the retarded part from that of the advanced part of a dither cycle. This approach is found to require averaging the signals over large number of engine cycles and using large dither amplitude. The third strategy uses the Difference of Knock Intensity strategy where two cycle standard deviation is used. The last strategy was shown to improve the signal to noise ratio by at least a factor of two, even at high engine speed (4800 rpm). The strategy was implemented and was able to keep the timing within 5 CAD.


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    Titel :

    Detecting Knock in Noisy Spark Ignition Engines


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Pacific Conference On Automotive Engineering ; 1993



    Erscheinungsdatum :

    1993-11-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Detecting knock in noisy spark ignition engines

    Soelaiman,T.A. / Bandung Inst.of Technol.,ID | Kraftfahrwesen | 1993


    Knock in Spark Ignition Engines

    By,A. / Kempinski,B. / Rife,J.M. et al. | Kraftfahrwesen | 1981


    Knock in Spark Ignition Engines

    By, A. / Kempinski, B. / Rife, J. M. | SAE Technical Papers | 1981


    Knock Erosion in Spark-Ignition Engines

    Fitton, John / Nates, Roy | SAE Technical Papers | 1996


    Knock in spark ignition hydrogen engines

    Li, Hailin / Karim, Ghazi A. | Tema Archiv | 2004