Emissions from heavy-duty vehicles in real operation on the road often differ greatly from those that would be projected from laboratory testing. Reasons for this difference include variations between laboratory and real-world driving conditions, wear and deterioration that are not effectively modeled by laboratory tests, inadequate or inappropriate in-use maintenance, and the use of “cycle-beating” strategies and “defeat devices” by engine manufacturers. This paper analyzes data showing in-use emissions from heavy-duty diesel and natural gas vehicles tested using various driving cycles on chassis dynamometers. It is shown that average in-use emissions of particulate matter (PM) and oxides of nitrogen (NOx) from late model heavy-duty diesel engines are much higher than predicted by current emission models, and greatly exceed the emission standards to which these engines were certified. In-use PM emissions from heavy-duty natural gas engines are found to be lower than projected from certification data, while in-use NOx emissions from natural gas engines vary by manufacturer.


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    Title :

    Comparison of In-Use Emissions from Diesel and Natural Gas Trucks and Buses


    Additional title:

    Sae Technical Papers



    Conference:

    International Truck & Bus Meeting & Exposition ; 2000



    Publication date :

    2000-12-04




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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