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    • Investigation on Effects of Low and High Pressure EGR on GDI Engine and Its Turbocharger
    DOI：10.13949/j.cnki.nrjgc.2018.04.006
    Key Words:low and high pressure exhaust gas recirculation(EGR)  gasoline direct injection(GDI)  turbocharger  performance
    Author NameAffiliation
    ZENG Qi, SHEN Kai, ZHANG Zhendong, YIN Congbo, ZHOU Wenping 1.Luzhou Vocational and Technical College, Luzhou 646000， China； 2.College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 201804， China 
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    Abstract:The investigation was performed by testing into the effects of low pressure(LP) exhaust gas recirculation(EGR) or high pressure(HP) EGR on a gasoline direct injection(GDI) engine and its turbocharger. The behavior changes of the engine and turbocharger with LP EGR or HP EGR were compared at full and partial loads. The reasons of the changes were analyzed through some variations, including combustion, fuel consumption, as well as intake and exhaust. The results indicate that EGR can optimize the combustion of a turbocharged GDI engine, reduce the pumping mean effective pressure and lower the fuel consumption. At partial load, the thermal efficiency with LP EGR is higher than that with HP EGR. The mean reason is that with LP EGR more exhaust energy is applied to turbocharger and the temperature of exhaust gas entering cylinder is lower, thus optimizing combustion.
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