The primary objective of this research program was to reduce pumping losses associated with the standard air intake system for spark ignition engines. This was accomplished by controlling the induction of the air/fuel charge with variable valve timing applied to the intake valves.The intake manifold pressure was maintained at atmospheric pressure and the timing of the intake valves was electronically adjusted to allow the induction of an air/fuel mixture sufficient to support the required engine load. This variable valve timing allowed flexibility in scheduling the intake valve timing events, simulating throttled operation with improved efficiency. Brake-specific-fuel-consumption (BSFC) was improved significantly, while air/fuel ratios remained stabilized, with no sacrifice in load control.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Development of a Variable Valve Timed Engine to Eliminate the Pumping Losses Associated with Throttled Operation


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1986



    Publication date :

    1986-03-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Development of a variable timed engine to eliminate the pumping losses associated with throttled operation

    Elrod,A.C. / Nelson,M.T. / Clemson Univ.,Dep.of Mechanical Engng.,GB et al. | Automotive engineering | 1986


    ANALYSIS OF THROTTLED ENGINE OPERATION

    Lichty, L. C. | SAE Technical Papers | 1938


    Using the 2nd Law of Thermodynamics to Optimize Variable Valve Timing for Maximizing Torque in a Throttled SI Engine

    Kohany, T. / Sher, E. / Society of Automotive Engineers | British Library Conference Proceedings | 1999