The report discusses the variations which have been observed among the EPA light-duty vehicle dynamometers during vehicle-dynamometer coast-downs. The purpose of this investigation is to recommend a tolerance value for the allowable variation between the 'target' coastdown time interval, supplied by the manufacturer and the time interval obtained from the EPA vehicle-dynamometer confirmatory test. This tolerance is a measure of the acceptable error between the road experience of the vehicle as reported by the manufacturer and the simulation by the dynamometer during the EPA tests. As such the tolerance is a direct limit on the road load simulation error which EPA will accept and still consider the test results valid.


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    Title :

    Effects of Dynamometer Variability on the Confirmation of Requests for Alternate Dynamometer Power Absorption


    Contributors:

    Publication date :

    1978


    Size :

    45 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English