Towards H-infinity Control of an SI Engine's A/F Ratio

Christian Vigild, Michael Struwe, Karsten Andersen, Elbert Hendricks

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    Long term stoichiometric Air/Fuel Ratio (AFR) control of an SI engine is at the present mainly maintained by table mapping of the engine's fresh air intake as a function of the engine operating point. In order to reduce a stationary error in the AFR to zero the table based control normally works in conjunction with a PI feedback from a HEGO sensor. The effective bandwidth of this feedback loop is quite small, generally around 2 Hz. This is altogether too small for accurate AFR control.This paper presents a new lambda control methodology (H-infinity) which has a somewhat larger bandwidth and can guarentee robustness with respect to selected engine variable and parameter variations.
    Original languageEnglish
    Title of host publicationSAE Technical Papers no 1999-01-0845 and SP-1419
    Place of PublicationWarrendale PA USA
    Publication date1999
    Publication statusPublished - 1999
    EventSAE International Congress & Exposition 1999: Diesel exhaust aftertreatment  - Detroit, United States
    Duration: 1 Mar 19994 Mar 1999


    ConferenceSAE International Congress & Exposition 1999
    Country/TerritoryUnited States

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