Traditionally, vehicle emission testing has used non-intelligent analyzers to meet government-regulated standards. Typically, these instruments would provide a 0 to 5-volt signal to a central test cell computer which would then handle all calibrations including analyzer linearization, zero and span corrections, stability checks, time delays, and sample readings. Modern gas analyzers now contain intelligence within each individual analyzer; this has caused the calibration methods to change dramatically.New methods were developed in the bench control system to take advantage of the intelligence of the analyzers by creating a distributed control architecture. The zeroing, spanning, and linearization methods are quite different from the previous protocols. The results, however, will provide more accurate reading to be used in calculating vehicle emissions.


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    Title :

    New Methods for Emission Analyzer Calibrations


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    International Congress & Exposition ; 1999



    Publication date :

    1999-03-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    New methods for emission analyzer calibrations

    Megdanoff,C. / Beaudoin,M. / Middleton,R. et al. | Automotive engineering | 1999


    New Method for Emission Analyzer Calibrations

    Megdanoff, C. / Beaudoin, M. / Middleton, R. et al. | British Library Conference Proceedings | 1999