A number of spark ignition engines from 1997 to 2003 are analyzed for their overall friction characteristics using the Willans line approach. This methodology appears to be quite robust across many different types of engines. Using a variety of partial and complete engine maps from multiple manufacturers, it is confirmed that engine friction has been decreasing over the decades (compared to past studies). Overall there has been a 25% reduction over 30 years. It is also demonstrated that thermal efficiency (defined here as the slope of fuel mep and bmep excluding enrichment) has been remaining steady during the same period. The application to aggregate engine models is discussed.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Friction Reduction Trends in Modern Engines


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2004 World Congress & Exhibition ; 2004



    Publication date :

    2004-03-08




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Friction reduction trends in modern engines

    Nam,E.K. / Sorab,J. / Ford Motor,US | Automotive engineering | 2004


    Friction Reduction Trends in Modern Engines

    Nam, E. K. / Sorab, J. / Society of Automotive Engineers | British Library Conference Proceedings | 2004


    Investigation of friction behavior in modern combustion engines

    Wagner,A. / Grabner,P. / Eichlseder,H. et al. | Automotive engineering | 2012