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    • Experimental Study of the Effects of Internal Exhaust Gas Recirculation on the Spark-Assisted Gasoline Compression Ignition （SAGCI） Under Low-Load Working Conditions
    DOI：10.13949/j.cnki.nrjgc.2023.05.006
    Key Words:spark-assisted compression ignition  internal exhaust gas recirculation（iEGR）  low load  heat efficiency  emission
    Author NameAffiliationE-mail
    ZHANG Fan* State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China 2020135266@qq.com 
    ZHENG Zunqing* State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China zhengzunqing@tju.edu.cn 
    CHEN Peng State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China chen_peng@tju.edu.cn 
    WANG Mengkai State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China 1554528287@qq.com 
    WANG Hu State Key Laboratory of Engines， Tianjin University， Tianjin 300072， China wang_hu@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 internal exhaust gas recirculation（iEGR） on spark-assisted gasoline compression ignition （SAGCI） were studied on a single-cylinder engine equipped with electro-hydraulic variable valves. It was compared with the strategies of simple SAGCI （without iEGR）， and gasoline compression ignition（GCI） combined with iEGR（GCI+iEGR）. The results show that the autoignition combustion rate of SAGCI is accelerated with the increase of the iEGR rate， and the range of injection and ignition are widened. The CO and total hydrocarbon（THC） emissions are effectively improved， but the heat transfer loss is increased and the thermal efficiency is reduced. Comparing the three strategies of SAGCI+iEGR， SAGCI and GCI+iEGR， it is found that all these strategies can extend the limit of load to 15 mg per cycle（0.15 MPa indicate mean effective pressure）. The restriction of intake conditions can be reduced and the post-ignition phenomenon of high iEGR rate can be avoided when the strategy of SAGCi+iEGR is used. To achieve the highest indicated thermal efficiency of 38.5%， the iEGR rate needs to be set to 29%.
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