Different Diesel-Electric hybrid powertrains, from micro to mild hybrids, equipping a mid-size European passenger car were evaluated in this paper through numerical simulation, in order to obtain a preliminary assessment of their potential as far fuel consumption and NO(x) emissions reductions are concerned. Impact assessment was not limited to regulated driving cycles, such as NEDC, but included also 'real-world representative' driving cycles, such as Artemis cycles, so to estimate the impact of hybridization not only for type-approval CO2 and NO(x) emissions, but also on fuel consumption figures perceived by the vehicle owner. BAS based micro-hybrid architectures, although allowing modest FC savings as far as typeapproval NEDC values are concerned (about 3%), allowed the achievement of remarkable consumption reductions (10-15 %) on both UDC and Artemis urban cycles under warm engine operating conditions, along with substantial NOx emissions cuts (up to 30% in the Artemis cycle). If micro-hybrids architectures are coupled with engine downsizing, further benefits in terms of fuel consumption reductions for urban driving conditions can be achieved, reaching a 20% FC decrease on Artemis driving cycle, although quite severe penalties should be faced in terms of NEDC NO(x) emissions, despite the attempts to adapt engine calibration by increasing as much as possible EGR rates in the higher load area. However, it should be pointed out that, despite a possible worsening in NEDC NO(x) values (which is mainly due to the EUDC segment contribution, for which hybridization benefits are negligible compared to downsizing penalties), NO(x) emissions in real world urban driving conditions may be reduced by more than 25%. Higher levels of hybridization, such as those exploited by FAS architectures, allow typeapproval FC savings of about 6%, which are almost double than those obtained through BAS architectures, although still scarce if compared with costs and complexity increase. However, if real-world urban cycles under warm engine operating conditions are considered, impressive fuel savings can be achieved (up to 30% in the Artemis cycle), along with substantial NO(x) emissions cuts (-20%), thus suggesting that more important consumption reductions could be perceived by the vehicle's owner than those highlighted by the NEDC values, making the diesel hybridization more attractive and effective.


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    Title :

    Analysis of different hybrid architectures and power management strategies for european diesel passenger cars


    Contributors:


    Publication date :

    2009


    Size :

    14 Seiten, 7 Bilder, 4 Tabellen, 8 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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