This paper describes cyclic Air/Fuel ratio (AFR) measurements carried out with a novel device (fUEGO) based on a production Universal Exhaust Gas Oxygen sensor, but modified to give an improved frequency response. The results are compared to AFR calculated from a fast CO/CO2 analyser and a fast response flame ionization detector (FID).The direct comparison of the two different methods for determining the cyclic AFR reveals that the electrochemical device is in reasonable agreement with the more complex carbon balance method and can provide reliable cyclic AFR measurements with a reduced requirement for equipment and data post processing. The fUEGO however is sensitive to elevated levels of uHC's (unburned hydrocarbons) during misfires or partial burns and readings during such situations usually show deviations compared to the carbon balance method.The frequency response of the fUEGO is in the 6 - 12 milliseconds region, depending on the step size of the AFR step, and although this is slower than the fast CO/CO2 analyser and the fast FID, cyclic resolution is possible up to high engine speeds.


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    Title :

    Study of Cycle-By-Cycle Air-to-Fuel Ratio Determined from the Exhaust Gas Composition and a Novel Fast Response Device Based on a Wide Band Lambda Sensor


    Additional title:

    Sae Technical Papers


    Contributors:
    Collings, N. (author) / Regitz, S. (author)

    Conference:

    Powertrains, Fuels and Lubricants Meeting ; 2008



    Publication date :

    2008-10-06




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





    Study of Cycle-By-Cycle Air-to-Fuel Ratio Determined from the Exhaust Gas Composition and a Novel Fast Response Device Based on a Wide Band Lambda Sensor

    Regitz, S. / Collings, N. / Society of Automotive Engineers | British Library Conference Proceedings | 2008



    Fast response cycle-to-cycle exhaust gas analysis in S.I. engines

    Pucher, E. / Associazione Tecnica dell'Automobile; Sezione Toscana | British Library Conference Proceedings | 1994


    Fast-Response Zirconia Sensor-Based Instrument for Measurement of the Air/Fuel Ratio of Combustion Exhaust

    Colvin, Alex D. / McKelvy, Frederick E. / Butler, James W. et al. | SAE Technical Papers | 1984