Homogeneous Charge Compression Ignition (HCCI) has a great potential for low NOx emissions but problems with emissions of unburned hydrocarbons (HC). One way of reducing the HC is to use direct injection. The purpose of this paper is to present experimental data on the trade off between NOx and HC. Injection timing, injection pressure and nozzle configuration all effect homogeneity of the mixture and thus the NOx and HC emissions.The engine studied is a single cylinder version of a Scania D12 that represents a modern heavy-duty truck size engine. A common rail (CR) system has been used to control injection pressure and timing.The combustion using injectors with different nozzle hole diameters and spray angle, both colliding and non-colliding, has been studied. The NOx emission level changes with start of injection (SOI) and the levels are low for early injection timing, increasing with retarded SOI. Different injectors produce different NOx levels. Especially at late injection timing, at about -50° ATDC, there is a significant difference between injectors. The HC emissions also differ for different injection timing and injectors.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Start of Injection Strategies for HCCI-combustion


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    2004 Powertrain & Fluid Systems Conference & Exhibition ; 2004



    Publication date :

    2004-10-25




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Start of Injection Strategies for HCCI-combustion

    Nordgren, H. / Hultqvist, A. / Johansson, B. et al. | British Library Conference Proceedings | 2004


    Start of injection strategies for HCCI-combustion

    Nordgren,H. / Hultqvist,A. / Johansson,B. et al. | Automotive engineering | 2004


    Operating strategies on HCCI combustion

    Babic,G. / Berner,H.J. / Bargende,M. et al. | Automotive engineering | 2010


    Transition from HCCI to PPC Combustion by Means of Start of Injection

    Johansson, Bengt / Shen, Mengqin / Lonn, Sara | SAE Technical Papers | 2015