The in-cylinder gas flow is an important factor that affects the engine performance. The appropriate swirl can reduce cycle-to-cycle variations, increase flame propagation speed, and improve the combustion efficiency. Many technologies can induce significant swirl, but lead to intake flow loss. In this research work, the variable valve lift difference adjustment mechanism is developed to obtain and adjust in-cylinder swirl without weakening flow capacity in a four-valve gasoline engine. The in-cylinder swirl and tumble characteristics generated by the variable valve lift difference adjustment mechanism are studied by means of experiment and simulation. The results of the experiment and simulation show the intensity of tumble and swirl under the larger lift valve is increased with the increase in the phase difference between two intake cams at same camshaft angle, and a large-scale swirl is formed in the cylinder when the camshaft angles change from 40° to 80°, and another large scale swirl is formed during the camshaft angles change from 100° to 140°, but the rotating direction of the secondary swirl is inverse to that of first swirl. The scale and shape of the in-cylinder tumble and swirl are not changed significantly with the increase in the phase difference between two intake cams when the camshaft angles change from 80° to 100°. A brief discussion on the research results that improve the performance of actual gasoline engine is given.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Effects of the variable valve lift difference on in-cylinder gas flow in a four-valve gasoline engine


    Beteiligte:
    Zhang, Shiqiang (Autor:in) / Li, Chunshu (Autor:in) / Liu, Ruilin (Autor:in) / Bao, Jingyang (Autor:in) / Chi, Miao (Autor:in)


    Erscheinungsdatum :

    01.06.2019


    Format / Umfang :

    12 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Management System for Continuously Variable Valve Lift Gasoline Engine

    Tagami, Hiroshi / Ito, Hisashi / Sato, Masahiro et al. | SAE Technical Papers | 2007


    Management System for Continuously Variable Valve Lift Gasoline Engine

    Tagami, H. / Yasui, Y. / Sato, M. et al. | British Library Conference Proceedings | 2007



    Management system for continuously variable valve lift gasoline engine

    Tagami,H. / Yasui,Y. / Sato,M. et al. | Kraftfahrwesen | 2007


    Improvements to a Four Cylinder Gasoline Engine Through the Fully Variable Valve Lift and Timing System UniValve®

    Knecht, Andreas / Gollasch, Daniel / Flierl, Rudolf et al. | SAE Technical Papers | 2006