The combustion method of the quality controlled gasoline engine offers substantial potential to reduce CO2 emissions in combustion engines. It is based on lean combustion across the entire map range, where even the mixture zone in stratified operation has a lean air-fuel ratio. In addition to the turbocharger and the injection system, the ignition system is a key component to enable lean combustion. The Corona ignition system is able to provide the necessary expansion of the lean combustion limit leading to the mentioned positive effects in terms of fuel consumption and raw emissions, both in lean homogeneous and lean stratified combustion modes. To achieve the full benefits, an optimisation of the combustion chamber geometry and the tip of the Corona igniter is necessary. This paper presented a comprehensive optimization strategy: first of all the operating conditions were determined under which the ignition was to be optimised, including ignition angles, corresponding piston positions, combustion chamber pressure, charge motion and mixture composition. In the next step measurements were conducted on a pressurized flow test stand and on the engine dyno in motored and fired engine conditions. The potential of the quality controlled gasoline engine concept (QCG) combustion approach, with the Corona ignition as an integral component, was demonstrated with respect to fuel consumption and emissions and was put in perspective with the known stratified charge combustion approach. Finally, an analysis of the thermodynamic losses was presented.


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    Titel :

    Corona ignition as an enabler for lean combustion concepts leading to significantly reduced fuel consumption of turbocharged gasoline engines


    Beteiligte:
    Becker, Michael (Autor:in) / Rixecker, Georg (Autor:in) / Brichzin, Volker (Autor:in) / Günther, Michael (Autor:in) / Tröger, Ralf (Autor:in) / Kratzsch, Matthias (Autor:in)


    Erscheinungsdatum :

    2013


    Format / Umfang :

    20 Seiten, 17 Bilder, 13 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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