Certain harmonics of angular crankshaft velocity are indicative of engine imbalance induced by cylinder misfire. Application of the Digital Fourier Transformation (DFT) facilitates the production-feasible calculation of a singular index in the frequency domain indicative either of smooth engine operation or misfire. The phase of that particular index with proper interpretation directly points to a misfiring cylinder. The identification of a misfiring pair, either opposing or a non-opposing in the cylinder bank, requires a bit more sophisticated approach since the phase response of the characteristic index in the frequency domain becomes more complex. The method demonstrated here was successfully applied in real time in four-, six-, and eight-cylinder engines, both SI and Diesel, for the On-Board Diagnostic application with reliability exceeding relevant regulatory requirements.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Phase Diagrams of Different Modes of Misfire Calculated from the Digital Fourier Transformation of Angular Crankshaft Velocity


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2010 World Congress & Exhibition ; 2010



    Publication date :

    2010-04-12




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





    Misfire Detection System based on the Measure of Crankshaft Angular Velocity

    Bue, F. L. / Di Stefano, A. / Giaconia, C. et al. | British Library Conference Proceedings | 2007


    Misfire detection system based on the measure of crankshaft angular velocity

    Bue, F. Lo / Stefano, A. di / Giaconia, C. et al. | Tema Archive | 2007


    Detection of Partial Misfire in IC Engines Using a Measurement of Crankshaft Angular Velocity

    Lee, Donghyeon / Rizzoni, Giorgio | SAE Technical Papers | 1995


    Detection of partial misfire in IC engines using a measurement of crankshaft angular velocity

    Lee,D. / Rizzoni,G. / Hyundai Motor,KR et al. | Automotive engineering | 1995