The Environmental Protection Agency (EPA) is developing emission standards for nonroad spark-ignition engines rated over 19 kW. Existing emission standards adopted by the California Air Resources Board for these engines were derived from emission testing with new engines, with an approximate adjustment applied to take deterioration into account. This paper describes subsequent testing with two LPG-fueled engines that had accumulated several thousand hours of operation with closed-loop control and three-way catalysts. These engines were removed from forklift trucks for characterization and optimization of emission levels. Emissions were measured over a wide range of steady-state points and several transient duty cycles. Optimized emission levels from the aged systems were generally below 1.5 g/hp-hr THC+NOx and 10 g/hp-hr CO.


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    Title :

    Evaluation of Durable Emission Controls for Large Nonroad SI Engines


    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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