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    • Study on the Effects of Atkinson Rates in Coordination with Exhaust Gas Recirculation Rates on the Performances of a High-Efficiency Gasoline Engine
    DOI：10.13949/j.cnki.nrjgc.2024.05.007
    Key Words:Atkinson rate  exhaust gas recirculation（EGR）  high-efficiencygasoline engine  performance impact  synergistic effect
    Author NameAffiliationE-mail
    WANG Zhen* Internal Combustion Engine Research Institute， Tianjin University， Tianjin 300072， China
    Wuxi Advanced Internal Combustion Power Technology Innovation Center， Wuxi 214000， China     		176227@tju.edu.cn 
    ZU Bingfeng Internal Combustion Engine Research Institute， Tianjin University， Tianjin 300072， China zbf@163.com 
    XU Yuliang Internal Combustion Engine Research Institute， Tianjin University， Tianjin 300072， China xyl@126.com.cn 
    HU Biqian JAC Motor Company， Hefei 230022， China 13956996155@126.com.cn 
    WANG Jun JAC Motor Company， Hefei 230022， China 17755106172@126.com.cn 
    PANG Kai Internal Combustion Engine Research Institute， Tianjin University， Tianjin 300072， China  
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    Abstract:In order to quantify the effect of Atkinson （ATK） effect on the power performance and fuel consumption of high efficiency gasoline engines with high compression ratio， a definition of ATK rate （Ratk） was proposed， which takes into account the effective expansion ratio and effective compression ratio. The effects of different Atkinson cycle schemes on the performance of the whole machine were studied on the bench. Based on the optimal scheme and the best thermal efficiency （BTE） working condition， the influences of different ATK rates and exhaust gas recirculation （EGR） rates on fuel consumption were studied in detail. The results show that with the increase of Ratk， the rated torque shows a trend of increasing and then rapidly decreasing， the fuel consumption at the BTE condition point first rapidly decreases and then gradually slows down， and the fuel consumption at the characteristic point shows a trend of increasing and then rapidly decreasing. Overall， the system maximum Atkinson rate increased from 1.62 to 1.84， the characteristic operating point fuel consumption decreased by 3.5 g/（kW·h）， the best fuel consumption decreased by 2.5 g/（kW·h）， and the power decreased by 3 N·m. In addition， in the BTE operating condition， there is a certain coupling relationship between the ATK rate and the external EGR rate， and the maximum can’t be obtained at the same time. When the ATK rate is at a medium-low value， the optimal fuel consumption performance can be achieved.
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