A test schedule was created by the California Air Resources Board (ARB) to reasonably represent the activity of Heavy Heavy-Duty Diesel Trucks (HHDDT) in the State of California. The HHDDT schedule was based on a statistical replica of data from real world vehicle speed measurements and consisted of four modes; namely, Idle, Creep, Transient and (high speed) Cruise. The objectives of the present study were to examine and validate this schedule and develop associated test procedures. Following recommendations on cycle smoothing and the limitation of deceleration rates, a revised, filtered version of the schedule was prepared. Experimental research on the schedule was conducted using one of the West Virginia University (WVU) Transportable Heavy-Duty Vehicle Testing Laboratories. The four modes were programmed as driver's target traces, and the ability to follow the cycle was determined using both a late model Mack tractor and an older Ford tractor. Speed versus time data for the Mack, obtained on the dynamometer at 25,000, 42,000 and 56,000 lbs simulated test weights, revealed that the weight influenced the ability of the vehicle to follow the trace accurately. Both gear shifting time delays and low power-to-weight ratio caused difficulty in meeting the acceleration rates prescribed in the trace. It was evident that at light test weights, shifting time dominated acceleration delays; but at 56,000 lbs, the vehicle acceleration suffered significantly from loss of power to weight ratio.


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    Title :

    Qualification of the Heavy Heavy-Duty Diesel Truck Schedule and Development of Test Procedures


    Contributors:
    M. Gautam (author) / N. N. Clark (author) / W. S. Wayne (author) / G. Thompson (author) / D. W. Lyons (author)

    Publication date :

    2002


    Size :

    150 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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