Our simulation results indicate that utilizing PCCI (premixed charge compression ignition) combustion could result in significant reductions in fuel consumption and tailpipe emissions for conventional diesel-powered LD passenger vehicles equipped with LNT and DPF emissions controls operating over the UDDS(urban dynamic driving schedule) drive cycle. These benefits result from a favorable engine speed-load distribution over the cycle (providing frequent opportunities for initiating PCCI) combined with a corresponding reduction in the need to regenerate the LNT and DPF. Even though PCCI generates higher engine-out CO and HC emissions, the CO and HC tailpipe emissions are reduced due to the reduced need for LNT and DPF(diesel particulate filter) regeneration. A more optimized engine control strategy for the LNT regeneration, however, might reduce the high level of CO and HC slip imposed by overdosing. This is an important area that deserves further investigation. Current PCCI technology appears to offer much less potential benefit for diesel LD HEVs equipped with similar emissions controls. This is because PCCI can only be activated over a relatively small part of the drive cycle. With the simplified LNT and DPF regeneration strategies simulated in this study, this limited use of PCCI had little impact on regeneration frequency. Thus the estimated improvements in fuel economy and tailpipe emissions were minimal. This implies that significant extension of the available speed-load range for PCCI, revision of current HEV engine management strategies, and optimizing fuel use during LNT/DPF regeneration should have high priority in future studies. The results also show that, in the HEV, the relative fuel penalties associated with LNT and DPF regeneration are higher than for the conventional vehicle. This is because LNT and DPF regeneration events are more likely to disrupt the HEV engine operation when it is near an optimal efficiency condition. Thus it is even more important in HEVs to optimize the regeneration process to prevent overdosing. We caution that the absolute values of the cycleaverage diesel HEV fuel economy and emissions estimates from these simulations should be treated with caution, as there were no direct experimental measurements available for validation. Nevertheless, we expect that the predicted general trends are correct.


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    Titel :

    Simulating the impact of prenmixed charge compression ignition on lightduty diesel fuel economy and emissions of particulates and NOx


    Beteiligte:
    Gao, Zhiming (Autor:in) / Daw, C. Stuart (Autor:in) / Wagner, Robert M. (Autor:in) / Edwards, K. Dean (Autor:in) / Smith, David E. (Autor:in)


    Erscheinungsdatum :

    2013


    Format / Umfang :

    21 Seiten, 17 Bilder, 3 Tabellen, 54 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch







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    Homogeneous charge compression ignition of diesel fuel

    Ryan,T.W. / Callahan,T.J. / Southwest Research Inst.,San Antonio,US | Kraftfahrwesen | 1996