The potential of an electric assisted turbocharger for a heavy-duty diesel engine has been analyzed in this work, in order to evaluate the turbo-lag reductions and the fuel consumption savings that could be obtained in an urban bus for different operating conditions.The aim of the research project was to replace the current variable geometry turbine with a fixed geometry turbine, connecting an electric machine which can be operated both as an electric motor and as an electric generator to the turbo shaft. The electric motor can be used to speed up the turbocharger during the acceleration transients and reduce the turbo-lag, while the generator can be used to recover the excess exhaust energy when the engine is operated near the rated speed, in order to produce electrical power that can be used to drive engine auxiliaries. In this way the engine efficiency can be improved and a kind of “electric turbocompounding” can be obtained.However, the potential of this kind of system depends to a great extent on the driving cycle (i.e. the “regeneration” periods, when the electric machine operates as a generator, should be long enough to produce and store the energy that is required to speed-up the turbocharger during the acceleration transients of the internal combustion engine).The potential of this “Electric Exhaust Gas Turbocharging” for a six cylinder, 8 liter displacement, HD diesel engine has therefore been analyzed in this work, through a 1-D engine simulation fluid dynamic code, coupled to a driveline and vehicle model. Fuel consumption reductions of 6 to 1 % were demonstrated, depending on the driving cycle.


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    Titel :

    The Potential of Electric Exhaust Gas Turbocharging for HD Diesel Engines


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Pautasso, E. (Autor:in) / Mallamo, F. (Autor:in) / Millo, F. (Autor:in) / Ganio Mego, G. (Autor:in)

    Kongress:

    SAE 2006 World Congress & Exhibition ; 2006



    Erscheinungsdatum :

    2006-04-03




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Electric exhaust gas turbocharging for HD diesel engines

    Millo,F. / Politecnico di Torino,IT | Kraftfahrwesen | 2006


    The potential of electric exhaust gas turbocharging for HD diesel engines

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    Turbocharging automotive diesel engines

    Lohr,F.W. / Opel,Ruesselsheim,DE | Kraftfahrwesen | 1989


    Turbocharging Four-Cycle Diesel Engines

    Flynn,P.F. / Cummins Engine,US | Kraftfahrwesen | 1979


    Turbocharging Four-Cycle Diesel Engines

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