This paper discusses the application of a control strategy which minimises total power loss in a hybrid system by continuously adapting the operating point of each power source towards the most efficient steady state. The technique is demonstrated in simulation using a model of the Toyota Prius hybrid vehicle architecture. The powertrain of the Toyota Prius has a parallel configuration, comprising a generator, motor and engine connected via an epicyclic gear train; this can be modeled using seven degrees of freedom with five constraints applied. The change in total power loss from the transmission can therefore be determined as a function of a change in two of the freedoms in the system - in this case engine speed and torque. A term involving the battery state of charge is added to provide a cost function suitable for an on-line gradient optimisation. Control is applied through a hierarchical structure with a 'top-level' strategic controller setting demands for the operating point of the generator, motor and engine. These are then achieved through a set of independently tuned SISO controllers, with the very low level (e.g. power electronics) modeling and control simplified to representative dynamics. Controller performance is compared with energy loss and fuel consumption results obtained from simulations employing a baseline logical strategy that is representative of the system employed on the production vehicle. Results confirm distinct advantages of the efficiency based control algorithm although human factors issues may impose practrical restrictions.


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    Title :

    Optimized control of an advanced hybrid powertrain based on energy efficiency criteria


    Additional title:

    Optimierte Steuerung einer fortgeschrittenen Hybridkraftübertragung auf der Grundlage von energetischen Wirkungsgradkriterien


    Contributors:
    Kells, A.J. (author) / Best, M. (author) / Gordon, T.J. (author) / Kelly, D. (author)


    Publication date :

    2000


    Size :

    10 Seiten, 6 Bilder, 2 Tabellen, 7 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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