Recently emissions regulations are being strengthened. An air-fuel ratio cylinder imbalance causes emissions to increase due to universal exhaust gas oxygen (UEGO) sensor error or exhaust gas oxygen (EGO) sensor error. Various methods of reducing an air-fuel ratio cylinder imbalance have been developed. It is preferable for a control system to operate over a wide range of conditions. Our target is to expand the operating conditions from idling to high load conditions.Our approach is to use both an UEGO sensor and a crank angle sensor. A two-revolution frequency component calculated from the UEGO sensor output signal and angular acceleration calculated from the crank angle sensor output signal are used to identify the cylinder where the air-fuel ratio error occurs. The detection result using the UEGO sensor precedes the detection result using the crank angle sensor when the engine is operated under a high load because the detection accuracy of the method using the UEGO sensor is higher under these conditions. On the other hand, the result using the crank angle sensor precedes the result using the UEGO sensor when the engine is operated at low engine speeds because the detection accuracy using the crank angle sensor is higher under these conditions. Consequently, it is possible to expand the control operating conditions.Experimental results using a real car showed that the developed control method operated under most of the conditions in the Japanese test cycle (JC08 Hot) and reduced NOx emissions by 90% compared with a car without the developed control method where an air-fuel ratio cylinder imbalance occurred.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Individual Cylinder Control for Air-Fuel Ratio Cylinder Imbalance


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Numata, Akihito (Autor:in) / Nakagawa, Shinji (Autor:in) / Hori, Toshio (Autor:in)

    Kongress:

    SAE 2015 World Congress & Exhibition ; 2015



    Erscheinungsdatum :

    2015-04-14




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Individual Cylinder Control for Air-Fuel Ratio Cylinder Imbalance

    Nakagawa, Shinji / Numata, Akihito / Hori, Toshio | British Library Conference Proceedings | 2015


    Individual cylinder control of air-fuel ratio cylinder imbalance

    Nakagawa,S. / Numata,A. / Hori,T. et al. | Kraftfahrwesen | 2015


    Diagnostics of Individual Air Fuel Ratio Cylinder Imbalance

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


    Individual cylinder fuel control for imbalance diagnosis

    Smith,J.C. / Schulte,C.W. / Cabush,D.D. et al. | Kraftfahrwesen | 2010


    Individual Cylinder Fuel Control for Imbalance Diagnosis

    Schulte, Charles / Cabush, David / Smith, James C. | SAE Technical Papers | 2010