A heavy-duty compression ignition engine using EGR and pilot-ignited directly injected natural gas fueling was calibrated for low NOx emissions. A Cummins ISX engine using cooled EGR was fitted with a Westport HPDI™ fuel system and an oxidation catalyst. The base engine hardware was modified to increase EGR rates (up to 40%). The engine, rated at 336 kW (450 hp) and 2236Nm (1650 ft-lbs), was calibrated and tested over steady state and transient test cycles. Steady state testing over the ESC 13-mode test cycle resulted in weighted composite NOx emissions of 0.36 g/bhp-hr and particulate matter emissions of 0.04 g/bhp-hr. Transient testing over the US EPA specified FTP cycle resulted in average NOx emissions of 0.6 g/bhp-hr and PM emissions of 0.03 g/bhp-hr.


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    Title :

    Development of a Compression Ignition Heavy Duty Pilot-Ignited Natural Gas Fuelled Engine for Low NOx Emissions


    Additional title:

    Sae Technical Papers


    Contributors:
    Goudie, D. (author) / Lyford-Pike, E. (author) / Wright, J. (author) / Dunn, M. (author) / Frailey, M. (author) / Munshi, S. R. (author) / Duggal, V. (author)

    Conference:

    2004 Powertrain & Fluid Systems Conference & Exhibition ; 2004



    Publication date :

    2004-10-25




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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