Abstract Stringent regulations on exhaust emissions and fuel economy for vehicles have become major issues in the automotive industry. Hybrid electric vehicles (HEV) are one of the crucial alternative plans to current conventional vehicles, but they have drawbacks, which include increases in total hydrocarbon (THC) emission from the engine and deterioration of the combustion stability with frequent stopping and restarting of the engine. Intake port fuel film is evaporated up during the deceleration state due to the fuel-cut. The λ (relative A/F ratio) at engine restart is lean because part of injected fuel is used to form the fuel film in the intake port. This study revealed the behavior of a fuel film in engine stop with fuel-cut and in engine restart with a simulation model. To investigate the fuel film characteristics, a simulation model was applied and validated with a single-cylinder engine. The simulation result shows that λ of at least 1.2 is required for a stable engine restart. The minimum injection quantity of the first cycle for stable combustion is suggested to be at least 240% of the steady-state idle condition.


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    Title :

    Investigation of engine restart stability after idle stop for a mild type HEV powertrain


    Contributors:
    Yu, S. E. (author) / Ohn, H. S. (author) / Min, K. D. (author)


    Publication date :

    2013




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English


    Classification :

    BKL:    55.20$jStraßenfahrzeugtechnik / 55.20 Straßenfahrzeugtechnik



    Investigation of engine restart stability after idle stop for a mild type HEV powertrain

    Yu, S. E. / Ohn, H. S. / Min, K. D. | British Library Online Contents | 2013


    Investigation of engine restart stability after idle stop for a mild type HEV powertrain

    Yu, S. E. / Ohn, H. S. / Min, K. D. | Springer Verlag | 2013




    Combustion stability analysis during engine stop and restart in a hybrid powertrain

    Ohn, H. / Min, K. | British Library Online Contents | 2009