To achieve homogeneous charge compression ignition (HCCI) combustion in the range of low speeds and loads, special camshafts with low intake/exhaust cam lift and short intake/exhaust cam duration were designed. The camshafts were mounted in a Ricardo Hydra four-stroke single cylinder port fuel injection gasoline engine. HCCI combustion was achieved by controlling the amount of trapped residuals from previous cycle through negative valve overlap. The results show that indicated mean effective pressure (IMEP) depends on valve timings, engine speeds and lambda. Early exhaust valve closing (EVC) timings result in high residual fractions in the cylinder and low air mass sucked into the cylinder. As a result, combustion duration increases, IMEP and peak pressure decrease. However, pumping losses decrease. High engine speed has the similar effect on HCCI combustion characteristics as early EVC timings do. But inlet valve opening timings have slight effect on IMEP compared to EVC timings.Irrespective of engine speeds and valve timings, lambda influences gas exchange and combustion processes. Lean mixture decreases the residuals trapped in the cylinder. Furthermore, in the case of lambda 1.05, ignition often occurs early.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    An Experimental Study on HCCI Combustion in a Four-Stroke Gasoline Engine with Reduced Valve Lift Operations


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    He, Bang-Quan (Autor:in) / Zhao, Hua (Autor:in) / Xie, Hui (Autor:in) / Qin, Jing (Autor:in) / Zhang, Yan (Autor:in)

    Kongress:

    Powertrain & Fluid Systems Conference & Exhibition ; 2005



    Erscheinungsdatum :

    24.10.2005




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Performance of Two/Four Stroke Gasoline HCCI Engine with Electromagnetic Valve Train

    Sakai, Hiroyuki / Kim, Kyoung-Oh / Nakano, Michio et al. | SAE Technical Papers | 2007


    Performance of two/four stroke gasoline HCCI engine with electromagnetic valve train

    Kim,K.O. / Sakai,H. / Kobayashi,T. et al. | Kraftfahrwesen | 2007


    CFD Simulation of HCCI Combustion in a 2-Stroke DI Gasoline Engine

    Chen, Changyou / Li, Gang / Johns, Richard J. R. et al. | SAE Technical Papers | 2003


    CFD Simulation of HCCI Combustion in a 2-Stroke DI Gasoline Engine

    Li, G. / Bo, T. / Chen, C. et al. | British Library Conference Proceedings | 2003


    A Study of HCCI Combustion Using a Two-Stroke Gasoline Engine with a High Compression Ratio

    Iijima, Akira / Shoji, Hideo / Yoshida, Koji et al. | SAE Technical Papers | 2006