Advanced automatic transmissions are controlled by electronic control units (ECUs) which perform the gear change and furthermore a lot of complex control and diagnostic functions. Hardware-in-the-loop simulation (HIL) is a powerful tool to develop and test the control algorithms implemented in the ECUs. The simulation is based upon mathematical models of the different power train components, adapted to the real-time requirements. In this paper an improved real-time model of an automatic transmission with a Ravigneaux planetary gear train is presented. This transmission contains among other components numerous clutches and brakes. The time-variant states of these nonlinear elements (sliding and static friction) lead to numerical problems with respect to real-time simulation. In the suggested model the transferred torques of the different clutches and brakes are calculated using the methods of multi-variable control.


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    Titel :

    An Improved Real-Time Model of a Planetary Gear Train


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Klages, B. (Autor:in) / Theuerkauf, H. J. (Autor:in) / Woermann, R. J. (Autor:in)

    Kongress:

    SAE International Congress and Exposition ; 1997



    Erscheinungsdatum :

    1997-02-24




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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