A hybrid city minibus has been built according to the results of a comprehensive model of the vehicle-road interactions and of the propulsion system. The model is physically consistent and represents all the phenomena occurring inside the propulsion system. It allowed for the selection of the components, with the constraints related to their presence on the market, that is under the existing technology. The APU (Auxiliary Power Unit) control strategies have been optimized off-line, analyzing the influence of the control variables on the fuel consumption and on the steady state pollutant emissions. The conventional Thermostat Mode shows the best efficiency, but causes a high APU start-stop frequency. Charge Sustaining Mode keeps the battery charge on a constant level, reduces the APU start-stop frequency but leads to higher fuel consumption. The minibus has been equipped with a data acquisition system allowing for the measurement of the most significant paramenters: the on road measured data during mission profiles gave the possibility to validate the vehicle model and those of the main sub-components, as well as, some preliminary control actions. On these basis, all the elements for a model based control have been set up. The activity will be focused, in a near future, to the development of model based control strategies aimed at the reduction of the fuel consumption and of the polluting emissions.


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    Title :

    Design and optimization of a hybrid city minibus


    Additional title:

    Design und Optimierung eines Hybrid-Citykleinbus


    Contributors:


    Publication date :

    2004


    Size :

    9 Seiten, 16 Bilder, 4 Tabellen, 27 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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