The hybrid electric vehicle (HEV) has obtained a role as niche model for some long time, and, it currently has to face up to achieving full market penetration. Today the development of hybrid propulsion systems is a main focus of many manufacturers worldwide. In the case of sub- and compact class vehicles the intended purposes of operation are short-distance and urban traffic services. In this context especially a parallel-hybrid powertrain concept plays to its strengths, recovery of brake energy (recuperation) and torque addition (boost-mode). So, a new range of possible tasks emerges in adjustment and coupling of the conventional parts of the powertrain and the new electric components. In this paper sample results of a German governmentaided project being conducted at the Institut für Kraftfahrwesen (ika) are presented. This paper shows, that hybrid-vehicle specific shuffle can be reduced by the developed controlling systems. Using a highly sophisticated cosimulation model to fulfil demands of NVH-investigations, two operating modes are considered comfort degrading. In one case, the coupled power boost mode, and, in the other case, the coupling of both part powertrains, excite shuffle vibrations of the vehicle. For each manoeuvre a controller system was developed and applied. Finally, both systems were coupled. By exploiting the electro motors quick response and its ability to produce high torque even at low revolutions, it is possible to position defined steep and high torque peaks in such a way as to compensate shuffle and to ensure comfort is not degraded. In near future, the coupled models will be validated by measured data from tests conducted with the real vehicle. In a following step, the controlling systems will be transferred to the real-vehicles HCU in order to optimise the longi-tudinal comfort.


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    Title :

    Investigation of load change effects of a parallel hybrid small vehicle


    Contributors:


    Publication date :

    2008


    Size :

    8 Seiten, 14 Bilder, 7 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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