The flywheel-transmission-internal combustion engine hybrid vehicle concept presents a number of unique control requirements.For consumer acceptance, all control functions must be accomplished automatically so that the car can be driven inthe same manner as a conventional automatic transmission vehicle. In contrast to a conventional vehicle, the speed of a flywheel car is controlled by controlling the continuously-variable transmission (CVT). A torque control system is found to be the best approach. The alternative, ratio control, requires a more sophisticated system and presents a strong possibility for instability in the flywheel-drive train-vehicle system. Thus the transmission becomes a torque matching device rather than a speed matching device. With torque control, the CVT ratio itself becomes a resultant variable rather than a controlled variable, and need only be considered for secondary functions such as gear shifting. Methods of implementing torque control are described for CVT designs based on the rolling contact traction drive, the variable V-belt, hydrostatic, and slipping clutch principles. For best fuel economy it is useful to vary both the minimum and maximum allowable flywheel speeds as functions of vehicle speed, operating mode, and system parameters. It is also advantageous under certain conditions to declutch the flywheel and drive directly from the engine. These control aspects and others are treated in the paper. (Wassmann)


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    Title :

    Control considerations for a flywheel hybrid automobile with a mechanical continuously - variable transmission


    Additional title:

    Betrachtungen zur Steuerung eines Schwungradhybridfahrzeuges mit einem mechanischen, stetig variablem Getriebe


    Contributors:


    Publication date :

    1980


    Size :

    10 Seiten, 7 Bilder, 9 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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