A new hybrid concept (i-MoGen), combining a downsized, high specific output engine and mild hybrid system has been developed. This powertrain combination provides a significant improvement in fuel consumption whilst maintaining competitive performance levels. The key strategy with this system has been to minimise the battery size and power; electrical assistance is only used at low engine speeds and to improve transient response when required. Specifically, the practical implementation issues for a prototype vehicle, electrical and control systems, system costs and initial vehicle results are covered. Separating the 42 V electrical system into three voltage networks enabled conflicting requirements be accommodated (i.e. wide voltage range of FMED & NiMH battery combination, v stabilised supply of 42 V ancillaries). However, on a production vehicle programme this could be replaced with a dual voltage system, comprising just one 42 V network and one 14 V network, without loss of performance. The use of a supervisor controller enabled a real-time strategy to be developed that minimised electrical energy usage whilst maintaining vehicle systems integrity and performance. The mild hybrid approach adopted by i-MoGen incurs a significant on-cost, although the cost to benefit ratio is significantly better than more conventional hybrid systems currently in production. However, further cost reductions are required for widespread implementation of this technology.


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    Title :

    Mild hybrid operation with a downsized diesel engine: a practical approach to outstanding fuel economy


    Contributors:
    Gordon, R. (author) / Fussey, P. (author)


    Publication date :

    2003


    Size :

    13 Seiten, 5 Bilder, 2 Tabellen, 8 Quellen



    Type of media :

    Article/Chapter (Book)


    Type of material :

    Print


    Language :

    English




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