Wideband SI Engine Lambda Control

Per Buchbjerg Jensen, Mads Bruun Olsen, Jannik Poulsen, Christian Vigild, Elbert Hendricks

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    Long term control of the AFR (Air/Fuel Ratio) of spark ignition engines is currently accomplished with a self-oscialling PI control loop. Because of the intake/exhaust time delay, the oscillation frequency and hence bandwidth of this loop is small. This paper describes a new approach to the design of this control loop using a novel observer system. In this way the bandwidth of this important loop is increased by a factor of 2 - 6 times, leading to more accurate oberall AFR control. Moreover the observer approach is so robust and allows such feedback levels that it reduces significantly the accuracy required in the calibration of the base fuel contrl system with which it is to be used. It can be used with either convention- or advanced observer based- base fuel strategies.
    Original languageEnglish
    Title of host publicationSAE Technical Papers
    Place of PublicationWarrendale PA USA
    Publication date1998
    Publication statusPublished - 1998
    EventSAE Annual International Congress & Exposition 1998 - Detroit, United States
    Duration: 1 Feb 19981 Feb 1998


    ConferenceSAE Annual International Congress & Exposition 1998
    Country/TerritoryUnited States

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