This paper describes the reduction of cyclic combustion variations in spark-ignited engines, especially under idle conditions in which the air-fuel mixture is lean of stoichiometry. Under such conditions, the combination of residual cylinder gas and parametric variations (such as variations in fuel preparation) gives rise to significant combustion instabilities that may lead to customer-perceived engine roughness and transient emissions spikes. Such combustion instabilities may preclude operation at air-fuel ratios that would otherwise be advantageous for fuel economy and emissions. This approach exploits the recognition that a component of the observed combustion instability results from a noise-driven, nonlinear deterministic mechanism that can be actively stabilized by small feedback control actions which result in little if any additional use of fuel. Application of this approach on a test vehicle using crankshaft acceleration as a measure of torque and fuel pulse width modification as a control shows as much as 30% reduction in rms variation near the lean limit.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Controlling Cyclic Combustion Variations in Lean-Fueled Spark-Ignition Engines


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Daw, C. S. (Autor:in) / Yuan, F. (Autor:in) / Connolly, F. T. (Autor:in) / Green, J. B. (Autor:in) / Hoard, J. W. (Autor:in) / Feldkamp, L. A. (Autor:in) / Davis, L. I. (Autor:in)

    Kongress:

    SAE 2001 World Congress ; 2001



    Erscheinungsdatum :

    05.03.2001




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Controlling cyclic combustion variations in lean-fueled spark-ignition engines

    Davis,L.I. / Feldkamp,L.A. / Hoard,J.W. et al. | Kraftfahrwesen | 2001


    Lean Mixture Operation of Hydrogen-Fueled Spark Ignition Engines

    Keffer, James F. / Wallace, James S. / Segal, Liviu | SAE Technical Papers | 1985


    Combustion-Associated Wear in Alcohol-Fueled Spark Ignition Engines

    Naegeli, David W. | SAE Technical Papers | 1989


    Modeling of cyclic variations in spark-ignition engines

    Dai,W. / Trigui,N. / Lu,Y. et al. | Kraftfahrwesen | 2000


    Modeling of Cyclic Variations in Spark-Ignition Engines

    Dai, W. / Trigui, N. / Lu, Y. et al. | British Library Conference Proceedings | 2000