In this study, experiments were carried out to evaluate fuel consumption and exhaust emissions of carbon monoxide (CO), oxides of nitrogen (NOx) and hydrocarbons (HC) with compressed natural gas (CNG) and gasoline fueled SI engine powered vehicles. Studies were carried out to evaluate optimum spark timing to operate both on CNG as well as gasoline mode for fuel consumption and emissions. In this connection, mass emission tests were carried out at various spark timings. Conversion efficiency of a 3-way catalytic converter was also evaluated at different air-fuel ratio for CNG operation. The results showed that exhaust emissions of CO and NOx were significantly less with CNG as compared to gasoline. Optimum spark timing for better fuel economy and lower emissions on gasoline and CNG modes were 10° before TDC and 24° to 26° before TDC respectively. Fuel consumption was found to be less with CNG operation, while the maximum conversion efficiency of the catalytic converter in CNG mode was found to be lying at air-fuel ratio between 19 and 20.


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    Title :

    Comparison of Emissions and Fuel Consumption From CNG and Gasoline Fueled Vehicles - Effect of Ignition Timing


    Additional title:

    Sae Technical Papers


    Contributors:
    Sharma, P.B. (author) / Ranjan, Rakesh (author) / Maji, S (author)

    Conference:

    SAE 2000 India Mobility Conference ; 2000



    Publication date :

    2000-01-15




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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