Given the fact that, in an endeavor to achieve the goals of engineering for a trade-off between cleaning up exhaust emissions and maximizing fuel economy, two main paths are being followed in advancing and optimizing SI-engine operating strategy in the upper part-load range. On the one hand, homogenization and operation in the compression ignition mode seem to offer a promising means of minimizing NOx emission by keeping the combustion temperature below the formation borderline and accepting a high cylinder-pressure gradient to obtain benefits in fuel economy. On the other hand, there are ambitions to widen the range of stratified operation using a supercharger or turbocharger. This way, efficiency of the engine cycle can be improved by operating at a higher global air-fuel ratio and, with this, a higher polytropic exponent, thereby taking the efficiency chain to a higher level.As seen in wall-guided stratified combustion systems in the past, there is a trade-off between NOx mass flow / PM emission and fuel economy. However, it has not been possible to achieve efficient homogeneous lean-burn operation with this type of engine.Now, the spray-guided engine is seen to provide a much greater potential for optimizing mixture formation by using an advanced injection system that offers the greatest scope for avoiding wall impingement on the piston surface while delivering well-atomized fuel spray, even under high backpressure conditions.


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    Titel :

    Investigations on Supercharging Stratified Part Load in a Spray-Guided DI SI Engine


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:
    Kneifel, A. (Autor:in) / Velji, A. (Autor:in) / Pape, J. (Autor:in) / Sens, M. (Autor:in) / Buri, S. (Autor:in) / Spicher, U. (Autor:in)

    Kongress:

    SAE World Congress & Exhibition ; 2008


    Erschienen in:

    Erscheinungsdatum :

    14.04.2008


    Format / Umfang :

    6 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Investigations on Supercharging Stratified Part Load in a Spray-Guided DI SI Engine

    Kneifel, A. / Buri, S. / Velji, A. et al. | British Library Conference Proceedings | 2008



    Engine supercharging

    Engineering Index Backfile | 1941


    DIESEL ENGINE SUPERCHARGING

    JONES, C. R. | SAE Technical Papers | 1947


    Supercharging compression-ignition engine

    Dicksee, C.B. | Engineering Index Backfile | 1941