The targets for future gasoline engines in terms of fuel consumption and exhaust gas emissions require the introduction of advanced technologies to increase engine efficiency.The mechanically fully-variable valve train system UniValve is an effective device to reduce fuel consumption through throttle-free load control. This is achieved by the simultaneous variation of valve lift and valve opening event. The method of cylinder deactivation by closing the gas exchange valves is a further approach to increase the efficiency of combustion engines especially at part load.This paper presents the combination of both techniques on a downsized, turbo charged 4-cylinder DI gasoline engine. The mechanical integration of the valve shut-off capability for cylinder deactivation into the Univalve system is explained and strategies for the transition between 2-cylinder and 4-cylinder modus are discussed. The thermodynamic benefits through adoption of both technologies are analyzed and a reasonable application area of cylinder deactivation in the engine operation map is pointed out. In the conclusion, the achievable fuel consumption benefits will be presented.


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    Titel :

    Cylinder Deactivation with Mechanically Fully Variable Valve Train


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:
    Lauer, Frederic (Autor:in) / Breuer, Michael (Autor:in) / Flierl, Rudolf (Autor:in) / Hannibal, Wilhelm (Autor:in)

    Kongress:

    SAE 2012 World Congress & Exhibition ; 2012


    Erschienen in:

    Erscheinungsdatum :

    16.04.2012


    Format / Umfang :

    9 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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