The ever-increasing requirements regarding emissions as well as fuel consumption further complicate the compliance with legal boundary conditions. Especially in view of real drive conditions combined with increasing engine complexity, the consequent engine-out emission reduction becomes a challenge. Combined high and low pressure EGR systems as well as the use of valve train functionalities to make use of the benefits from internal EGR increase the degrees of freedom in engine calibration drastically. Additionally transient conditions become more relevant due to new emission cycles (WLTP in 2020 at the latest) and in real drive emission testing or random cycles. The given paper shows an air path control concept developed by FEV which allows a highly flexible use of multi EGR paths with a significant reduction of calibration effort at the same time. This concept reduces engine-out CO and HC emissions in low and medium load and also minimized the fuel consumption under medium and high load conditions. Changes in ambient conditions are covered with proper system reactions based on physical based rules to optimize the engine-out emission performance without the need for calibration of corrections for any air path set point. Additionally, transient NOx emission reduction becomes possible by independent control of each EGR path which allows spontaneous compensation for errors in desired EGR masses caused by physical transport delay times. Due to the physical based approaches used in this EGR coordination, also positive effects on changing fuel qualities can be taken into account in the EGR distribution optimization. This part of the functionality requires a feedback from the measured in-cylinder pressure, but helps significantly to reduce engine out emission variance caused by cetane number changes.


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    Titel :

    The ever-increasing requirements regarding emissions as well as fuel consumption further complicate the compliance with legal boundary conditions. Especially in view of real drive conditions combined with increasing engine complexity, the consequent engine-out emissiReduction of engine-out emission and fuel consumption by variable EGR distribution in diesel and multi fuel en


    Beteiligte:
    Hu, Yunyu (Autor:in) / Körfer, Thomas (Autor:in) / Miccio, Michele (Autor:in) / Schaub, Joschka (Autor:in) / Schnorbus, Thorsten (Autor:in)


    Erscheinungsdatum :

    2013


    Format / Umfang :

    16 Seiten, Bilder, Tabellen, 8 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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