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    • Effects of Exhaust Gas Recirculation Rates on Combustion and Emission Characteristics of High Compression Ratio Turbocharged Direct Injection Gasoline Engine
    DOI：10.13949/j.cnki.nrjgc.2022.03.014
    Key Words:supercharged direct injection gasoline engine  high compression ratio  exhaust gas recirculation（EGR）  combustion  emission
    Author NameAffiliationE-mail
    TAN Piqiang* School of Automobile， Tongji University， Shanghai 201804， China tpq2000@163.com 
    ZHOU Jie School of Automobile， Tongji University， Shanghai 201804， China  
    LOU Diming School of Automobile， Tongji University， Shanghai 201804， China  
    HU Zhiyuan School of Automobile， Tongji University， Shanghai 201804， China  
    FANG Liang School of Automobile， Tongji University， Shanghai 201804， China  
    ZHAO Binhao School of Automobile， Tongji University， Shanghai 201804， China  
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    Abstract:A turbocharged direct injection GDI gasoline engine with exhaust gas recirculation（EGR） technology was used to study the combustion and emission characteristics of the engine under different EGR rates （0%， 5%， 10%， 15%） at a high compression ratio of 15.0. The research results showed that compared with the conventional compression ratio of 11.5， when the machine adopted a high compression ratio of 15.0， in terms of combustion characteristics， the ignition timing was advanced and the combustion duration was prolonged， which led to the maximum explosion pressure in the cylinder， the average indicated pressure variation coefficient and the effective thermal efficiency were significantly improved. In terms of emissions， hydrocarbons（HC） and particulate numbers increased， but CO and particulate matter mass decreased， and nitrogen oxides（NOx） emissions increased slightly. EGR technology could effectively suppress knocking and reduce NOx emissions. Under the same working conditions， with the increase of EGR rate， the combustion duration of the machine and the coefficient of variation of the average indicated pressure increased， and under low load conditions （brake mean effective pressure was 0.5 MPa）， the maximum burst pressure in the cylinder gradually decreased， and the effective thermal efficiency did not change much. But under high load conditions （brake mean effective pressure was 1.0 MPa）， the maximum burst pressure in the cylinder showed an increase and decrease behavior， and the effective thermal efficiency showed an overall upward trend. In the case of high compression ratio， When the EGR rate of the engine is 10%， the thermal efficiency was the highest， which was 38.45%. Meanwhile， the CO first decreases and then increased， the HC gradually increased， and the NOx emissions significantly reduced， and the maximum reduction was 86.8%.
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