Alternative Observers for SI Engine Air/Fuel Ratio Control

Elbert Hendricks, Jannik Poulsen, Mads Bruun Olsen, Per Buchbjerg Jensen, Michael Føns, Christian Jepsen

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    In earlier work it has been shown that a nonlinear observer based on the use of the manifold pressure state equation and a nonlinear fuel film compensator can maintain accurate A/F ratio control during both steady state and transient operation. This observer may be called a manifold absolute pressure (MAP) observer because it is fundamentally dependent on the use of the manifold pressure state equation and a MAP sensor. It is in reality a constant gain extended Kalman filter. While this observer shows promise for some applications, it obviously cannot immediately be used with air mass flow sensors other than a MAP sensor. In this paper it is shown that it is possible to construct a family of alternative nonlinear observers which “naturally” allow the use of any given air mass flow related sensor or a combination of them for A/F ratio control. This new family of observers provides the SI engine control system designer with a variety of robust control systems which can easily be made redundant in order to satisfy newer engine emissions and diagnosis requirements and legislation
    Original languageEnglish
    Title of host publicationProc. 33rd IEEE Conf. on Decision and Control
    Place of PublicationKobe, Japan
    Publication date1996
    ISBN (Print)0-7803-3590-2
    Publication statusPublished - 1996
    Event33rd IEEE Conf. on Decision and Control (CDC) - Kobe, Japan
    Duration: 1 Jan 1996 → …


    Conference33rd IEEE Conf. on Decision and Control (CDC)
    CityKobe, Japan
    Period01/01/1996 → …

    Bibliographical note

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