An in-house Design of Experiments (DoE) process was utilised to determine optimal operating parameters for part load lean stratified operation in a spray guided gasoline direct injection engine with respect to fuel consumption, engine operation stability and engine out emissions. The variables for the present DoE were engine speed, engine load by means of total fuel quantity, number of injections, injection shape factor, and EGR rate. It could be shown that the application of multiple injections could be used to retard the 50% MFB angle to a thermodynamically more favourable position when compared to a single injection event. As a result peak in-cylinder gas pressure and peak in-cylinder gas temperature were lower leading to reduced engine out NOx emissions. Furthermore, the range of ignition angle for stable combustion could be increased when using multiple injections, compared to a single injection event. The combustion system has been proven to be comparable to market leaders with robust stratified NA engine operation to loads of up to 7 bar BMEP and engine speeds of up to 4500 rpm. Combining advanced multiple injection strategies with boosting enabled the stratified operating range to be extended to over 12 bar BMEP, with a further significant improvement in fuel consumption to class leading levels. As the load exceeded 8 bar BMEP the MIVIS injection strategy was superior in fuel consumption terms to the multiple injection strategy used at the lower loads and on the singe cylinder engine to minimise NOx emissions. The extended WOT part load operating region also increased the mass flow through the engine versus a conventional throttle boosted gasoline engine, and this resulted in an improved transient response of the turbocharger, which is a key issue particularly for downsized gasoline engines where the downsizing ratio could be as high as 50%. Finally, the robustness of the SGDI combustion system to the highest loads in combination with the latest boosting and future knock mitigation technologies has been clearly demonstrated.


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    Titel :

    Multiple injection and boosting benefits for improved fuel consumption on a Spray Guided Direct Injection gasoline engine


    Beteiligte:
    King, J. (Autor:in) / Schmidt, L. (Autor:in) / Stokes, J. (Autor:in) / Seabrook, J. (Autor:in) / Nor, F. (Autor:in) / Sahadan, S. (Autor:in)


    Erscheinungsdatum :

    2011


    Format / Umfang :

    14 Seiten, 10 Bilder, 1 Tabelle, 8 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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