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1.18.2017

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technical director

For more information, please contact Oscar Franzese, Technical Director, at franzeseo@ornl.gov or (865) 946-1304.

heavy truck duty cycle (HTDC) project

OVERVIEW
The Heavy Truck Duty Cycle (HTDC) Project was initiated in 2004 and is sponsored by the US Department of Energy’s (DOE’s) Office of FreedomCar and Vehicle Technologies Program. ORNL designed the research program to generate real-world-based duty cycle data from trucks operating in long-haul operations and was designed to be conducted in three phases:

  1. identification of parameters to be collected, instrumentation and pilot testing,
  2. identification of a real-world fleet, design of the data collection suite and fleet instrumentation, and
  3. data collection, analysis, and development of a duty cycle generation tool (DCGT).
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This type of data will be useful for supporting energy efficiency technology evaluation efforts, for developing and evaluating the Argonne National Laboratory's (ANL) Powertrain System Analysis Toolkit (PSAT) Class-8 module (C8M), and for providing a means of accounting for real-world driving performance within heavy truck analyses. The Program is led by Oak Ridge National Laboratory (ORNL), and includes Michelin Americas Research and Development Corporation (MARC), Schrader Trucking Company, Inc., and returning partner Dana Corporation. Six instrumented tractors and ten instrumented trailers collected data on their operations for a 15-month period. Sixty channels of data were collected at 5Hz for each of the instrumented tractors. A major product of this effort is a duty cycle generation tool that allows for the generation of a characteristic duty cycle based on user-specified parameters and real-world data.

TECHNOLOGY
In 2004, more than 100 parameters were identified as candidate measures of performance for data collection. Interactions with ANL identified those of importance for PSAT modeling. Parameter categories included engine performance, location/direction/speed/time-of-day, fuel consumption, real-time weight, precipitation/road condition, wind velocity/direction, road condition, and road grade. For the pilot test, Dana Corporation provided the free-use of a 1999 Peterbilt Tractor and Utility Box trailer. The tractor-trailer was instrumented to collect 104 channels of information at 100Hz. Another industry partner, Michelin, was interested in studying the effects on fuel consumption of their New Generation Single Wide-Based Tires (NGSWBTs) compared to standard dual tires. Two east-west runs were conducted from Kalamazoo, Michigan to Portland, Oregon and back, with each run conducted with different tires. A second set of north-south runs from Kalamazoo, Michigan to Bangor, Maine to Tampa, Florida to Kalamazoo, Michigan was conducted, and again with each run conducted with different tires. Initial analysis of the data indicated a 2.9 % fuel saving when NGSWBTs were utilized, and an 8.0% fuel saving when the data was corrected for congestion effects.

Another major effort that was engaged in during FY2007 was the development of a Duty Cycle Generation Tool (DCGT). This tool allows a user to specify characteristics of a duty cycle of interest to the user. For example, the user can specify road grade, weight, weather conditions, type of highway, etc. For the selected parameters, the tool will select all time periods out of the collected data which match the selected user specifications. Once these multiple segments are compiled, and the user indicates the length of the duty cycle required, the multiple segments are statistically combined to provide a characteristic duty cycle that conforms to the user’s specifications, and that is based on real-world performance.

RELATED DOCUMENTS
Below is a list of documents related to the HTDC research.