In order to further study the effects of air and EGR dilution on the fuel economy improvement of natural gas engines under the premise of meeting EU6 legislation, a comparison between stoichiometric operation with EGR and lean burn operation with and without EGR has been conducted at 1600rpm 50% and 75% load. The conversion efficiencies of the catalysts for both NOx and CH4 emissions are assumed at 90% for lean burn operation. Experiment results indicate that under the condition of meeting both NOx and CH4 predetermined engine-out emissions limits for EU6 legislation, lean operation with a small fraction of EGR dilution enables more advanced combustion phasing compared to pure lean operation, which results in much better fuel economy, thus further improvement compared to stoichiometric operation is achieved. Additionally, this advantage is enhanced with increased load, as the higher combustion and exhaust temperatures lead to lower CH4 emissions, therefore sufficient EGR dilution is enabled for further reducing NOx emissions, which results in more favorable combustion phasing.


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    Titel :

    A Comparative Study on the Fuel Economy Improvement of a Natural Gas SI Engine at the Lean Burn and the Stoichiometric Operation both with EGR under the Premise of Meeting EU6 Emission Legislation


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Mao, Bin (Autor:in) / Yan, Bowen (Autor:in) / Yao, Mingfa (Autor:in) / Li, Yongzhi (Autor:in) / Qin, Yufeng (Autor:in)

    Kongress:

    JSAE/SAE 2015 International Powertrains, Fuels & Lubricants Meeting ; 2015



    Erscheinungsdatum :

    2015-09-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Lean Burn Natural Gas Operation vs. Stoichiometric Operation with EGR and a Three Way Catalyst

    Johansson, Bengt / Einewall, Patrik / Tunestål, Per | SAE Technical Papers | 2005


    Catalyst development for stoichiometric and lean burn natural gas engines

    Gluck,K.H. / Lox,E. / Schafer-Sindlinger,A. et al. | Kraftfahrwesen | 1994


    Lean Burn Engine Concepts-Emissions and Economy

    John, James E. A. | SAE Technical Papers | 1975



    Effect of Fuel Composition on the Operation of a Lean Burn Natural Gas Engine

    Clark, N. N. / Mott, G. E. / Atkinson, C. M. et al. | British Library Conference Proceedings | 1995