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    • Effects of Miller Cycle of Different Compression Ratios and Low Pressure EGR on Performance of Turbocharged Gasoline Direct Injection Engine
    DOI：10.13949/j.cnki.nrjgc.2019.04.003
    Key Words:earlier intake valve closing（EIVC）  compression ratio  exhaust gas recirculation（EGR）  turbocharging  combustion
    Author NameAffiliation
    HUANG Zhaoming，SHEN Kai，AN Zongquan，CHEN Weiguo，PAN Jinyuan 1.Wentian College， Hohai University， Maanshan 243031, China； 2.School of Mechanical Engineering， University of Shanghai for Science and Technology， Shanghai 200093, China； 3.School of Automotive and Traffic Engineering， Jiangsu University， Zhenjiang 212013, China； 4.Automotive Engineering & Technology Research Institute， Chery Automobile Co., Ltd., Wuhu 241006, China 
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    Abstract:One new cam and three new pistons were designed for a turbocharged gasoline direct injection，(GDI) engine to realize high compression ratio Miller cycle. Moreover, exhaust gas recirculation(EGR) was adopted for the engine. The effects of the Miller cycle of different compression ratios and EGR on engine performance were investigated experimentally. The results show that there is a trade-off between high compression ratio and the Miller cycle in terms of knocking. The fuel consumption of the high compression ratio Miller cycle at low speeds with full load is slightly higher than that of the original engine; while low pressure cooled EGR can apparently improve engine fuel economy at full throttle characteristics conditions due to optimized combustion phase with its dilution and cooling effect. At part loads, the high compression ratio Miller cycle can lower fuel consumption by 6.3%. With low pressure cooled EGR fuel consumption can be further reduced by 3.1%. A conclusion can be drawn: The Miller cycle with a proper compression ratio and a low pressure cooled EGR can greatly improve engine fuel economy.
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