Recently, an infrared diode laser spectrometer was developed which measures carbon monoxide (CO) exhaust emissions with a 25 ms response time. This rapid CO analyzer and a torque transducer were used to study the dynamic effects of air-fuel ratio perturbations about stoichiometry on CO emissions and engine torque, Linearised perturbation models expressed by transfer functions were obtained using frequency response techniques. The air-fuel ratio was perturbed around stoichiometry by varying either throttle position or fuel rate (via a modified Throttle Body Injection system) while holding the other parameter constant. Three speed-load points were studied in an engine dynamometer test cell to examine the effects of engine speed and load conditions on the structure and coefficients of the transfer functions.


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    Title :

    A Linearized Model of Engine Torque and Carbon Monoxide Emissions


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE International Congress and Exposition ; 1983



    Publication date :

    1983-02-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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