The high-pressure direct injection (HPDI) of natural gas permits diesel engines to retain their performance and high fuel economy while reducing regulated emissions. In the work presented in this paper, a pilot diesel fuel ignites directly injected natural gas, and both fuels are injected through a single injector. Recently the HPDI engine achieved a combined NOx+nmHC emissions of 2.38 g/bhp-hr during official certification tests performed under the US EPA specified FTP cycle for heavy-duty diesel engines. NOx, nmHC and PM emissions were reduced by 45%, 85% and 71%, respectively, compared to the 1998 EPA emissions requirement. These results are consistent with previously reported results on a two-stroke engine. The present study clearly demonstrates that a combination of gas injection timing and pressure can significantly reduce NOx emissions while retaining the overall thermal efficiency.


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    Title :

    Direct Injection of Natural Gas in a Heavy-Duty Diesel Engine


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Spring Fuels & Lubricants Meeting & Exhibition ; 2002



    Publication date :

    2002-05-06




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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