A systematic methodology is developed for choosing the optimum ratio trajectory of a continuously variable transmission in a passenger vehicle. The optimum CVT ratio schedule is formulated as a constrained optimization problem with maximum fuel economy as the objective function and driveability concerns and physical limitations included as the constraints. The key notion to achieving good driveability is the introduction and definition of a horsepower reserve function that creates a consistent and desirable vehicle response under different driving conditions. Simulation results compare the optimized schedule's performance with several other possible ratio schedules, including the minimum brake specific fuel consumption map. Results from the optimized schedule indicate only a mild tradeoff between driveability and fuel economy relative to the other ratio schedules. The ratio optimization problem formulation and solution provide a novel and unique approach for systematically addressing driveability and fuel economy considerations associated with a continuously variable transmission.


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    Title :

    The horsepower reserve formulation of driveability for a vehicle fitted with a continuously variable transmission


    Contributors:

    Published in:

    Vehicle System Dynamics ; 41 , 3 ; 157-180


    Publication date :

    2004


    Size :

    24 Seiten, 27 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





    The Horsepower Reserve Formulation of Driveability for a Vehicle Fitted With a Continuously Variable Transmission

    Smith, Michael Henry / Barth, Eric J. / Sadegh, Nader et al. | Taylor & Francis Verlag | 2004



    Measuring Vehicle Driveability

    Everett, R. L. | SAE Technical Papers | 1971