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    • Experimental Investigations on Optimization Control Strategies of Gasoline Compression Ignition Combustion with High Compression Ratio at Low Loads
    DOI：10.13949/j.cnki.nrjgc.2023.05.005
    Key Words:gasoline compression ignition  low load  high compression ratio  combustion stability  maximum pressure rise rate  injection strategy
    Author NameAffiliationE-mail
    LI Yuanhao* State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China li_yh@tju.edu.cn 
    ZHANG Shouzhen State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China zhangshouzhen@tju.edu.cn 
    WANG Hu State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China wanghu@tju.edu.cn 
    CHEN Yong State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China yongchen@tju.edu.cn 
    LI Bing State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China libingme@tju.edu.cn 
    YAO Mingfa* State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China y_mingfa@tju.edu.cn 
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    Abstract:The effects of injection strategies on the low load combustion and emission characteristics of gasoline compression ignition were investigated on a gasoline compression ignition engine platform of six-cylinder diesel engine with a high compression ratio combustion chamber. The results show that increasing the compression ratio can effectively improve the combustion stability， combustion efficiency and indicated thermal efficiency of gasoline compression combustion at low loads， and reduce CO and HC emissions， but there is a problem of excessive maximum pressure rise rate. The maximum pressure rise rate can be controlled effectively by using double injection strategy. When the pilot injection mass is 3 mg and the injection interval is 10°， the maximum pressure rise rate is reduced from 1.174 MPa/（°）to 0.380 MPa/（°）， and the coefficient of cycle indicated mean effective pressure（IMEP） variation is 0.97%. And higher indicated thermal efficiency and lower emissions are obtained. The high compression ratio coupling adjustment of the injection strategy may be used to produce high-efficient and stable combustion at 0.2 MPa brake mean effective pressure， which significantly improves the poor combustion stability of gasoline compression ignition under low loads.
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