Hybrid propulsion is a viable solution to improve the fuel economy of road vehicles. The optimized CVT Hybrid is a parallel hybrid driveline based on a two-range Continuously Variable Transmission (CVT). Its core element is a novel two-range CVT with a large overall ratio spread. Shifting between the low-speed and high-speed range is accomplished without interruption of traction using two synchronized clutches in combination with coordinated control of the CVT. Fuel savings of up to 30 % compared with a conventional diesel-powered vehicle have been demonstrated, but the driveline also provides good drivability and high ride comfort. The IC engine can be started when the vehicle is in motion using a novel method. The electric machine driving the vehicle is used as a flywheel by quickly shifting the CVT ratio and transferring the torque induced by the deceleration of the electric machine's inertia to the IC engine through a multi-disc clutch. In this way, a jerk-free engine start with continuous acceleration of the vehicle is possible. The starting process of the IC engine and shifting between the two speed ranges are performed without interruption of traction. The paper describes the driveline concept and presents experimental results on the powershift, the engine start, fuel consumption and energy balance.


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    Title :

    Efficient CVT hybrid driveline with improved drivability


    Contributors:

    Published in:

    Publication date :

    2010


    Size :

    19 Seiten, 16 Bilder, 12 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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