An air-fuel ratio imbalance determination apparatus for a multi-cylinder internal combustion engine includes an air-fuel ratio sensor with a catalyst layer disposed in an exhaust passage of the multi-cylinder internal combustion engine; and a control unit configured: to perform determination regarding an air-fuel ratio imbalance state among cylinders of the multi-cylinder internal combustion engine based on an amount of change per unit time in an air-fuel ratio detected by the air-fuel ratio sensor; to execute an air-fuel ratio enrichment control using an air-fuel ratio enrichment amount; and to correct a learned imbalance value when the air-fuel ratio enrichment amount is smaller than a predetermined determination threshold value in a case where an engine operation state is in an imbalance learning range during execution of the air-fuel ratio enrichment control.


    Access

    Download


    Export, share and cite



    Title :

    Air-fuel ratio imbalance determination apparatus and air-fuel ratio imbalance determination method


    Contributors:

    Publication date :

    2016-03-08


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF / F02D CONTROLLING COMBUSTION ENGINES , Steuern oder Regeln von Brennkraftmaschinen




    Diagnostics of Individual Air Fuel Ratio Cylinder Imbalance

    Jammoussi, Hassene / Makki, Imad / Kluzner, Michael et al. | SAE Technical Papers | 2017


    Diagnostics of Individual Air Fuel Ratio Cylinder Imbalance

    Jammoussi, Hassene / Makki, Imad / Kluzner, Michael et al. | British Library Conference Proceedings | 2017


    Engine air to fuel ratio cylinder imbalance diagnostic

    VARNEY BRIAN | European Patent Office | 2016

    Free access

    Advanced Air-Fuel Ratio Sensor for Improved Detectability of Air-Fuel Ratio Imbalance

    Hayashita, G. / Aoki, K. / Kawai, M. et al. | British Library Online Contents | 2014