A Lambda Control Observer With Fault Correction

Christian Vigild, Michael Struwe, Per Buchbjerg Jensen, Mads Bruun Olsen, Elbert Hendricks

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


    At the present, a long term stoichiometric Air/Fuel Ratio (AFR) control of the an SI engine is maintained by using a switching HEGO sensor and gain scheduled, high gain, PI controller. Because of its inexpensive and primitive design and the engine time delay, this loop has a very low effective bandwidth. It seldom exceeds 2 Hz. This is altogether too small for accurate transient air/fuel ratio control. This paper presents a new lambda (normalized air/fuel ratio) control methodology based on a time delay observer. This technique makes possible a significant increase of the lambda control bandwidth while at the same time incoporating an integration term so that stationary AFR errors are reduced to zero.
    Original languageEnglish
    Title of host publicationProc. IFAC Workshop: Advances in Automotive Control
    Place of PublicationLoudonville OH USA
    PublisherInternational Federation of Automatic Control
    Publication date1998
    Publication statusPublished - 1998
    Event2nd IFAC Workshop on Advances in Automative Control 1998 - Loudonville, United States
    Duration: 26 Feb 19981 Mar 1998
    Conference number: 2


    Workshop2nd IFAC Workshop on Advances in Automative Control 1998
    Country/TerritoryUnited States
    Internet address

    Cite this