In order to investigate feasibility of DME (Di-methyl ether) assisted gasoline CAI (controlled-auto ignition) combustion, direct DME injection is employed to act as the ignition source to trigger the auto-ignition combustion of premixed gasoline/air mixture with high temperature exhaust gas. Intake re-breathing valve strategy is adopted to obtain internal exhaust recirculation (EGR) that regulates heat release rate and ignitability of the premixed gasoline and air mixture. The effects of intake re-breathing valve timing and 2nd DME injection timing of different split injection ratios were investigated and discussed in terms of combustion characteristics, emission and efficiencies. The analyses showed that re-breathing intake valve timing had a large effect on the operation range of CAI combustion due to EGR and intake temperature variation. The results of 2nd DME injection timing on various 1st / 2nd DME injection ratio indicated that the optimized 2nd DME injection timing depends on 1st / 2nd DME injection ratio. As1st DME injection ratio was increased, more retarded 2nd DME injection timing was required.


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    Title :

    Experimental Investigation on DME Assisted Gasoline CAI/HCCI Combustion with Intake Re-Breathing Valve Strategy


    Additional title:

    Sae Technical Papers


    Contributors:
    Zhao, Hua (author) / Seo, Kangwoo (author)

    Conference:

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



    Publication date :

    2015-09-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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