A challenge for engine development in the future is the reduction of fuel consumption and emissions, as well as the appearance of new, higher-load transient test cycles. To manage these new goals, new turbocharger technologies need to be considered. In chapter 2.2, a 1-D simulation illustrates the benefit of titan aluminide turbine wheel (50 % reduced inertia of turbine wheel), ball bearings (reduced friction), and a new VTG design (increased turbine efficiency) regarding transient behavior. The potential for these technologies is shown separately, in combination, as well as in comparison to an electrical booster. Moreover, the effects of these technologies on vehicle dynamics with the help of a simple 0-D approach are shown. In chapter 3, engine measurements are presented - on the one hand to verify the transient simulation study, and on the other hand, the potential to reduce fuel consumption of ball bearings is presented. Summarized, it was shown that there is still great potential in new turbocharger technologies to improve transient behavior as well as fuel consumption and emissions of internal combustion engines in the future. For example, a turbocharger with a combination of ball bearings, titan aluminide turbine wheel and an optimized VTG shows an approximately 13 % reduced time to 90 % work at 1500 rpm, without any drawbacks in fuel consumption, packaging or strains to power supply as an electrical booster. This results in noticeably better driving ability and also in a reduction of soot and NOx peaks. As an option to optimize emissions, the potential of the faster air system can be used to reduce emissions of soot and NOx during transient operation. The application of ball bearings and titan aluminide turbine wheel leads to a reduction of the time to reach 90 % boost pressure by 41 % under cold conditions and by 36 % under hot conditions. Besides, the engine measurements show a remarkable reduction of fuel consumption due to ball bearings, especially at cold conditions, e.g. up to 4 % at 1500 rpm at 3 bar bmep. Even in higher load cycles of the WLTC, the ball bearing promises a reduction of fuel consumption of approximately 1.5 % (based on a 0-D cycle calculation).


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    Titel :

    Transient behavior optimization of turbochargers in diesel passenger car engines


    Beteiligte:
    Kropp, M. (Autor:in) / Müller, J. (Autor:in) / Gauger, S. (Autor:in)


    Erscheinungsdatum :

    2013


    Format / Umfang :

    15 Seiten, 8 Bilder, 4 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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