The problem of precisely controlling the Air/Fuel-ratio of SI-engines is of paramount importance for the performance of Three-Way-Catalysts (TWC). Accurately controlled stoichiometric A/F-ratios help achieve very low emision levels. This paper proposes a novel nonlinear controller that exactly linearizes the dynamics of the A/F-ratio loop in SI-engines. Using nonlinear models of all relevant parts and ideas taken from the feedback linearization approach, a nonlinear state feedback is derived that both performs the usual fuel-film compensation and removes the inherent nonlinearity of A/F-ratio loops. It is shown that the proposed controller has certain similarities with known pragmatic solutions. Some questions connected to the realization (state observation, disturbance decoupling, etc.) are also discussed.


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    Title :

    Feedback linearizing air/fuel-ratio controller


    Additional title:

    Kraftstoff-Luft-Verhältnisregler mit Rückkopplungslinearisierung


    Contributors:
    Guzzella, L. (author) / Simons, M. (author) / Geering, H.P. (author)

    Published in:

    Publication date :

    1996


    Size :

    4 Seiten, 2 Bilder, 18 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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