The paper presents a fuel modulation attenuation model for single point closed-loop fuel metering systems. The model calculates the attenuation of a metered air-fuel perturbation and the time delay in the transport of the perturbed signal from the metering point through the engine to the exhaust system as functions of the modulation frequency, engine RPM, intake manifold vacuum, and exhaust gas recirculation. Results are shown for a V-8 engine with sine wave, triangular wave and square wave modulations. It is found that the attenuation for the triangular wave is the highest and that for the square wave is the smallest. It is also found that in general the attenuation increases with increasing modulation frequency and increasing EGR, but decreases with increasing RPM. The model can be extended to study the attenuation and transport delay of other engines and wave forms.


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    Title :

    An Attenuation and Transport Delay Model for Single Point Closed-Loop Fuel Metering Systems


    Additional title:

    Sae Technical Papers


    Contributors:
    Wu, Hai (author) / Blumberg, Paul N. (author)

    Conference:

    1979 Automotive Engineering Congress and Exposition ; 1979



    Publication date :

    1979-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    An Attenuation and Transport Delay Model for Single Point Closed-Loop Fuel Metering Systems

    Wu,H. / Blumberg,P.N. / Ford Motor,Engng.and Res.Staff,US | Automotive engineering | 1979


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    Eisele,H. / Wessel,W. / Bosch | Automotive engineering | 1976


    Minimum fuel closed-loop translation

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    Closed-Loop Engine Fuel System Simulation

    Horling, James E. / Harrer, Rudy E. | SAE Technical Papers | 1982