The spark advance and fuelling of engines have generally been controlled by fixed open-loop schedules as functions of engine speed and load. Many engines have inferior fuel economy and emissions because of engine/controller mismatch and variations in parameters such as compression ratio. These errors manifest themselves as changes in the rate of burning. A controller is described that can detect these changes and compensate for them by adapting the schedules of spark advance or air:fuel ratio. A detection scheme utilizes engine speed signals to measure the slope of the torque versus spark advance curve without a torque sensor. Comparative fuel economy and emissions results are shown for a fleet of vehicles using an adaptive spark advance controller based on this method. Finally we show how a related fuelling controller can maintain a desired air:fuel ratio without an expensive sensor.


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    Title :

    Adaptive Engine Controls for Fuel Consumption and Emissions Reduction


    Additional title:

    Sae Technical Papers


    Contributors:
    Wakeman, A. C. (author) / Nutton, D. (author) / Ironside, J. M. (author) / Holmes, M. (author) / Edwards, S. I. (author)

    Conference:

    SAE International Congress and Exposition ; 1987



    Publication date :

    1987-06-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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