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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    Title :

    Ignition Improvement for Ultra-Lean Dilute Gasoline Combustion


    Additional title:

    Sae Technical Papers


    Contributors:
    Tjong, Jimi (author) / Wang, Meiping (author) / Zheng, Ming (author) / Yu, Shui (author) / Yu, Xiao (author) / Han, Xiaoye (author) / Yang, Zhenyi (author)

    Conference:

    International Powertrains, Fuels & Lubricants Meeting ; 2017



    Publication date :

    2017-10-08




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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