Gas chromatography tests have been applied to the exhaust gases of a spark ignition engine to determine the concentration of unburned fuel among the total hydrocarbons. The contribution of the unburned fuel was determined for variation of several engine parameters. The fuel tested was isooctane. The varied parameters were air-fuel ratio, engine speed, ignition timing, compression ratio, and coolant and lubricant temperature. The results have shown that the unburned fuel is responsible for most of the HC emitted, participating with 50 to 73%, depending on the engine working conditions. Methane, acetylene, ethylene, ethane, propylene, and isobutylene were also analyzed, apart from isooctane. The total contribution of the lighter species remained practically unaltered when the parameters were varied, though their individual concentrations did change. Thus, the unburned HC was seen to determine all trends of exhaust hydrocarbons.


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    Title :

    Chromatograph Determination of Unburned Fuel Concentration in the Exhaust of a SI Engine


    Additional title:

    Sae Technical Papers


    Contributors:
    Yates, D.A. (author) / Sodré, J.R. (author)

    Conference:

    SAE Brasil 96 V International Mobility Technology Conference and Exhibit ; 1996



    Publication date :

    1996-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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