The HCCI (Homogeneous Charge Compression Ignition) combustion, obtained due to high EGR (Exhaust Gas Recirculation) rate, is known to be one of the best means to reduce emission levels of Diesel engines and to meet future emission standards. IFP has developed an HCCI Diesel prototype vehicle able to reach very low NOx emission levels without the need for expensive NOx after-treatment systems. The prototype vehicle includes the NADI (Narrow Angle Direct Injection) combustion chamber combined with a spezific injection system adapted to a 2.2 litre 4-cylinder Renault engine (G9T). This engine operates in both conventional and HCCI combustion modes. This technology has confirmed its high potential to dramatically drop the NOx and particulate emissions during the European urban cycle. However, owing to the high EGR rates used, the engine architecture and control must be adapted to get the maximum benefit of the HCCI combustion. In this paper one describes some fundamental aspects related to HCCI engine design: turbocharger matching, high pressure EGR circuit design, air and EGR cooling system design. All these components are defined taking into account the trade-off between the maximum power output and the pollution control area. If the after-treatment system is standard, consisting in an oxidation catalyst closed-coupled with a particulate filter, a by-pass of EGR coolers is used during warm up in order to reduce HC and CO engine-out emissions which are higher than the ones of the original G9T engine in the HCCI operating region. A specific torque structure is designed to control this engine with an innovative air path design combined with a specific fuel path allowing to adapt the injection settings to air path dynamics. Concerning the demonstrator vehicle, an integration study into the engine compartment is made from both points of view: mechanical and electrical with the substitution of the original electronic control unit by the IFP embedded rapid prototyping system. After having validated the engine hardware and pre-calibrated the torque control structure, the engine is transposed into a velSatis vehicle in order to perform the final tuning over the NEDC (New European Driving Cycle).


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    Titel :

    Optimisation of a low NOx emission HCCI diesel prototype vehicle


    Weitere Titelangaben:

    Optimierung eines Dieselmotors mit homogener selbstzündender Verbrennung und geringer NO(x)-Emission für ein Prototypfahrzeug


    Beteiligte:
    Magand, S. (Autor:in) / Watel, E. (Autor:in) / Castagne, M. (Autor:in) / Soleri, D. (Autor:in) / Grondin, O. (Autor:in) / Devismes, S. (Autor:in) / Moroz, S. (Autor:in)


    Erscheinungsdatum :

    2008


    Format / Umfang :

    19 Seiten, 19 Bilder, 5 Tabellen, 19 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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