In traditional internal combustion engines, a camshaft acts on the valve stems to open and close the valves. Valve timing is fixed relative to piston position. On the other hand, if a valve is flexibly controlled by a variable valve actuation (VVA) system, significant improvements in fuel efficiency, engine performance, emissions, etc. can be achieved. One of the most advanced variable valve actuation systems is the VVA operated by an electromechanical actuator without a camshaft, the so-called bi-positional electromechanical valve drive (BPVD). Existing BPVD characteristically use a spring to provide the required mechanical power for operating the valve. The use of a spring provides many benefits to the design of the system, but it also results in difficult design challenges. The large holding force against the spring at the ends of the stroke virtually dictates the use of a normal-force electromagnetic actuator which, from a servomechanical point of view, is inferior compared to a shear-force bi-directional electromagnetic actuator. Particularly, the large holding force generates a large jerk at the beginning and the end of the stroke and makes it difficult to achieve a soft valve landing. A new electromechanical valve drive (EMVD) design is proposed, which incorporates a non-linear mechanical transformer and a shear-force electromagnetic actuator eliminating the large jerk and allowing for improved control under disturbances with acceptable average and peak electric power. This design is modelled, analysed, and simulated.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    An electromechanical valve drive incorporating a nonlinear mechanical transformer


    Weitere Titelangaben:

    Ein elektromechanischer Ventilantrieb mit einem nichtlinearen mechanischen Transformer


    Beteiligte:
    Chang, W.S. (Autor:in) / Parlikar, T. (Autor:in) / Kassakian, J.G. (Autor:in) / Keim, T.A. (Autor:in)


    Erscheinungsdatum :

    2003


    Format / Umfang :

    9 Seiten, 15 Bilder, 22 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    An electromechanical valve drive incorporating a nonlinear mechanical transformer

    Chang,W.S. / Parlikar,T. / Kassakian,J.G. et al. | Kraftfahrwesen | 2003


    An Electromechanical Valve Drive Incorporating a Nonlinear Mechanical Transformer

    Kassakian, John G. / Keim, Thomas A. / Parlikar, Tushar et al. | SAE Technical Papers | 2003


    Electromechanical drive

    JOOS DIRK | Europäisches Patentamt | 2020

    Freier Zugriff

    ELECTROMECHANICAL DRIVE

    JOOS DIRK | Europäisches Patentamt | 2018

    Freier Zugriff

    ELECTROMECHANICAL DRIVE

    APALKOV VLADIMIR KONSTANTINOVICH / DAVYDOV ANDREJ VADIMOVICH / IVANOV BORIS IVANOVICH et al. | Europäisches Patentamt | 2020

    Freier Zugriff