The CVPST (continuously variable power split transmission) concept is presented in the context of an automotive application. The system consists of a variable pulley system (variator) coupling two of the three rotating elements of a planetary gear train. The main feature of this system is that the variator carries only a fraction of the total power flowing through the transmission, thus increasing the power envelope of the potential engine application. This feature also reduces the power losses associated with power transmission, especially at the low-speed-high-torque modes, while providing continuously variable transmission ratio capability. A term dubbed the 'crossover coefficient' is established which can be used to prescribe both the fraction of total power flowing through the variable element and the velocity ratio span for the transmission. An extension of which can be obtained by means of an external gear box allowing a stepless span in the optimum range of both engine and transmission. An engine-transmission-vehicle diagram is used to illustrate the vehicle velocity trace in relation to the continuously variable transmission diagram and the engine performance map. This diagram illustrates the difference between the typical geared transmission and the CVPST, with emphasis on optimum engine and transmission performance.


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    Titel :

    An automotive continuously variable power split transmission concept (CVPST)


    Weitere Titelangaben:

    Konzept eines stufenlos verstellbaren Getriebes mit Energieteilung (CVPST) für Kraftfahrzeuge


    Beteiligte:
    Kmicikiewicz, M. (Autor:in) / Cowan, B. (Autor:in) / Mucino, V.H. (Autor:in) / Smith, J.E. (Autor:in)


    Erscheinungsdatum :

    1999


    Format / Umfang :

    7 Seiten, 15 Bilder, 4 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    A Continuously Variable Power Split Transmission for Automotive Applications

    Mucino, V. H. / Smith, J. E. / Cowan, B. et al. | British Library Conference Proceedings | 1997


    A continuously variable power split transmission for automotive applications

    Mucino,V.H. / Smith,J.E. / Cowan,B. et al. | Kraftfahrwesen | 1997


    A Continuously Variable Power Split Transmission for Automotive Applications

    Cowan, Ben / Smith, James E. / Kmicikiewicz, Marek et al. | SAE Technical Papers | 1997


    Continuously variable power split transmission concept (CVPST) in hybrid vehicles

    Kmicikiewicz, M. / Cowan, B. / Mucino, V.H. | Tema Archiv | 2000


    Design of continuously variable power split transmission systems for automotive applications

    Mucino,V.H. / Lu,Z. / Smith,J.E. et al. | Kraftfahrwesen | 2001