The operating range in HCCI mode is limited by the excessive pressure rise rate and therefore high combustion induced noise. The HCCI range can be extended with turbocharging which enables increased dilution of the charge and thus a reduction of combustion noise. When the engine is turbocharged the intake charge will have a high temperature at increased boost pressure and can then be regulated in a cooling circuit. Limitations and benefits are examed at 2250 rpm and 400 kPa indicated mean effective pressure. It is shown that combustion stability, combustion noise and engine efficiency have to be balanced since they have optimums at different intake temperatures and combustion timings. The span for combustion timings with high combustion stability is narrower at some intake temperatures and the usage of external EGR can improve the combustion stability. It is found that the standard deviation of combustion timing is a useful tool for evaluating cycle to cycle variations. One of the benefits with HCCI is the low pumping losses, but when load and boost pressure is increased there is an increase in pumping losses when using negative valve overlap. The pumping losses can then be circumvented to some extent with a low intake temperature or EGR, leading to more beneficial valve timings at high load.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    The Effect of Intake Temperature in a Turbocharged Multi Cylinder Engine operating in HCCI mode


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:
    Johansson, Bengt (Autor:in) / Aulin, Hans (Autor:in) / Tunestål, Per (Autor:in) / Johansson, Thomas (Autor:in)

    Kongress:

    9th International Conference on Engines and Vehicles ; 2009


    Erschienen in:

    Erscheinungsdatum :

    2009-09-13


    Format / Umfang :

    15 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    HCCI Heat Release Data for Combustion Simulation, Based on Results from a Turbocharged Multi Cylinder Engine

    Johansson, Bengt / Aulin, Hans / Borgqvist, Patrick et al. | SAE Technical Papers | 2010


    Effect of Variable Length Intake Manifold on a Turbocharged Multi-Cylinder Diesel Engine

    Samuel, Jensen / Annamalai, Kumarasamy / NS, Prasad | SAE Technical Papers | 2013


    Supercharging HCCI to Extend the Operating Range in a Multi-Cylinder VCR-HCCI Engine

    Johansson, Bengt / Haraldsson, Göran / Hyvönen, Jari | SAE Technical Papers | 2003


    Supercharging HCCI to extend the operating range in a multi-cylinder VCR-HCCI engine

    Hyvoenen,J. / Haraldsson,G. / Johansson,B. et al. | Kraftfahrwesen | 2003