In this work, a spatially distributed spark ignition strategy was employed to improve the ignition process of well-mixed ultra-lean dilute gasoline combustion in a high compression ratio (13.1:1) single cylinder engine at partial loads. The ignition energy was distributed in the perimeter of a 3-pole igniter. It was identified that on the basis of similar total spark energy, the 3-pole ignition mode can significantly shorten the early flame kernel development period and reduce the cyclic variation of combustion phasing, for the spark timing sweep tests at λ 1.5. The effect of ignition energy level on lean-burn operation was investigated at λ 1.6. Within a relatively low ignition energy range, i.e. below 46 mJ per pole, the increase in ignition energy via ether 1 pole or 3 pole can improve the controllability over combustion phasing and reduce the variability of lean burn combustion. Higher ignition energy was required in order to enable ultra-lean engine operation with λ above 1.6. With the highest ignition energy achievable for the tested ignition system, the stable operable lean limits at a nominal engine load of 3 bar indicated mean effective pressure (IMEP) was extended by using 3-pole ignition, which consequently increased the thermal efficiency.


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    Titel :

    Ignition Improvement for Ultra-Lean Dilute Gasoline Combustion


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Tjong, Jimi (Autor:in) / Wang, Meiping (Autor:in) / Zheng, Ming (Autor:in) / Yu, Shui (Autor:in) / Yu, Xiao (Autor:in) / Han, Xiaoye (Autor:in) / Yang, Zhenyi (Autor:in)

    Kongress:

    International Powertrains, Fuels & Lubricants Meeting ; 2017



    Erscheinungsdatum :

    2017-10-08




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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