Piston wetting can be isolated from the other sources of HC emissions from DISI engines by operating the engine predominantly on a gaseous fuel and using an injector probe to impact a small amount of liquid fuel on the piston top. This results in a marked increase in HC emissions. All of our prior tests with the injector probe used California Phase 2 reformulated gasoline as the liquid fuel. In the present study, a variety of pure liquid hydrocarbon fuels are used to examine the influence of fuel volatility and structure. Additionally, the exhaust hydrocarbons are speciated to differentiate between the emissions resulting from the gaseous fuel and those resulting from the liquid fuel. It is shown that the HC emissions correspond to the Leidenfrost effect: fuels with very low boiling points yield high HCs and those with a boiling point near or above the piston temperature produce much lower HCs. As expected, there is a significant effect of fuel structure for fuels that have the same boiling point. For fuels with the same boiling point, the primary effect of structure appears to be its effect on unburned fuel emissions.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    The Effects of Fuel Volatility and Structure on HC Emissions from Piston Wetting in DISI Engines


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2001 World Congress ; 2001



    Publication date :

    2001-03-05




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    The effects of fuel volatility and structure on HC emissions from piston wetting in DISI engines

    Huang,Y. / Alger,T. / Matthews,R. et al. | Automotive engineering | 2001


    A Piezoelectric Sensor Concept for Measuring Piston Wetting in DISI Engines

    Camacho, Alejandro / Hall, Matthew J. | SAE Technical Papers | 2005


    A piezoelectric sensor concept for measuring piston wetting in DISI engines

    Camacho,A. / Hall,M.J. / Univ.of Texas at Austin,US | Automotive engineering | 2005


    Effects of piston wetting on size and mass of particulate matter emissions on a DISI engine

    Warey,A. / Huang,Y. / Matthews,R. et al. | Automotive engineering | 2002


    Effects of Piston Wetting on Size and Mass of Particulate Matter Emissions in a DISI Engine

    Warey, Alok / Ng, Henry / Hall, Matthew et al. | SAE Technical Papers | 2002