In order to investigate the impacts of recirculated exhaust gas temperature on gasoline engine combustion and emissions, an experimental study has been conducted on a turbocharged PFI gasoline engine. The engine was equipped with a high pressure cooled EGR system, in which different EGR temperatures were realized by using different EGR coolants. The engine ran at 2000 r/min and 3000 r/min, and the BMEP varied from 0.2MPa to 1.0MPa with the step of 0.2MPa. At each case, there were three conditions: 0% EGR, 10% LT-EGR, 10% HT-EGR. The results indicated that LT-EGR had a longer combustion duration compared with HT-EGR. When BMEP was 1.0 MPa, CA50 of HT-EGR advanced about 5oCA. However, CA50 of LT-EGR could still keep steady and in appropriate range, which guaranteed good combustion efficiency. Besides, LT-EGR had lower exhaust gas temperature, which could help to suppress knock. And its lower exhaust gas temperature could reduce heat loss. These contributed to fuel consumption reduction. For HT-EGR and LT-EGR, IMEP was similar at every operating point, but LT-EGR had lower pumping loss than HT-EGR, which also helped to reduce fuel consumption. Based on the above-mentioned factors, it was found that LT-EGR could help to reduce fuel consumption by 1%~ 2%, and the fuel efficiency improvement was better at high loads. Engine emissions were also discussed.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Effect of EGR Temperature on PFI Gasoline Engine Combustion and Emissions


    Additional title:

    Sae Technical Papers


    Contributors:
    Zhang, Fuyuan (author) / Li, Liguang (author) / Liu, Ting (author) / Chao, Yuedong (author) / Hu, Zongjie (author)

    Conference:

    International Powertrains, Fuels & Lubricants Meeting ; 2017



    Publication date :

    2017-10-08




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Effect of EGR Temperature on PFI Gasoline Engine Combustion and Emissions

    Liu, Ting / Zhang, Fuyuan / Chao, Yuedong et al. | British Library Conference Proceedings | 2017



    Flow, combustion and emissions in a five-valve research gasoline engine

    Kampanis,N. / Arcoumanis,C. / Kato,R. et al. | Automotive engineering | 2001


    Flow, Combustion and Emissions in a Five-Valve Research Gasoline Engine

    Arcoumanis, C. / Kampanis, N. / Kato, R. et al. | SAE Technical Papers | 2001


    Combustion and emissions modeling of a gasoline HCCI engine using model fuels

    Puduppakkam,K.V. / Liang,L. / Naik,C.V. et al. | Automotive engineering | 2009