Experimental studies have been carried out on homogeneous charge, spark ignition engines running on European pump-grade, 95 RON gasoline. The aim was to determine the limits on dilution and mixture proportions imposed by a deterioration in engine cycle-by-cycle combustion stability. The stable limit was taken as corresponding to a COVimep of 10%. Residual gas fraction was raised through engine load and valve timing changes, and determined by cylinder gas sampling. The results define a bounded region of stable operation on two diagrams, with axes of air/burned gas and fuel/burned gas for the first and burned gas fraction and air/fuel ratio for the second. For stable operation, gas/fuel ratio is limited to around 25:1 and is the constraint on upper limits of dilution and air/fuel ratio. For fuel-rich mixture operation, the limiting value of air/fuel ratio rises from around 9:1 to stoichiometric as burned gas fraction increases. The limiting value of burned gas fraction was less than or around 0.3.


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    Titel :

    Limits on Charge Dilution, Fuel and Air Proportions for Stable Combustion in Spark Ignition Engines


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Harbor, Neville (Autor:in) / Brown, Nicholas (Autor:in) / Shayler, Paul J. (Autor:in) / Lai, Wing-Cheung (Autor:in)

    Kongress:

    SAE 2004 World Congress & Exhibition ; 2004



    Erscheinungsdatum :

    2004-03-08




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Limits on Charge Dilution, Fuel and Air Proportions for Stable Combustion in Spark Ignition Engines

    Shayler, P. J. / Lai, W-C. / Brown, N. et al. | British Library Conference Proceedings | 2004




    Comparison of Dilution Techniques for Low Temperature Combustion in Spark Ignition Engines

    Mariani, Antonio / Foucher, Fabrice | SAE Technical Papers | 2014


    PERFORMANCE LIMITS OF SPARK-IGNITION ENGINES AND THE FUEL ASPECT

    van Driel, H. / Broeze, J. J. / Peletier, L. A. | SAE Technical Papers | 1940