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.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

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


    Additional title:

    Sae Int. J. Engines


    Contributors:
    Kneifel, A. (author) / Velji, A. (author) / Pape, J. (author) / Sens, M. (author) / Buri, S. (author) / Spicher, U. (author)

    Conference:

    SAE World Congress & Exhibition ; 2008


    Published in:

    Publication date :

    2008-04-14


    Size :

    6 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    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