Development of the Texas Drayage Truck Cycle and Its Use to Determine the Effects of Low Rolling Resistance Tires on the NO
Emissions and Fuel Economy
Trucks operating in inter-modal (drayage) operation in and around port and rail terminals, are responsible for a large proportion of the emissions of NOX, which are problematic for the air quality of the Houston and Dallas/Ft. Worth metro areas. A standard test cycle, called the Texas Dray Truck Cycle, was developed to represent the operation of heavy-duty diesel trucks in dray operations. The test cycle reflects the substantial time spent at idle (~45%) and the high intensity of the on-road portions. This test cycle was then used in the SAE J1321 test protocol to evaluate the effect on fuel consumption and NOX emissions of retrofitting dray trucks with light-weight, low-rolling resistance wide-single tires.
In on-track testing, a reduction in fuel consumption of 8.7% was seen, and NOX emissions were reduced by 3.8% with the wide single tires compared to the conventional tires. Without considering the test-cycle idle periods, the reductions were 9.3% and 7.4% for fuel consumption and NOX emissions, respectively.
Citation: Diller, T., Matthews, R., Hall, M., DeFries, T. et al., "Development of the Texas Drayage Truck Cycle and Its Use to Determine the Effects of Low Rolling Resistance Tires on the NOX Emissions and Fuel Economy," SAE Technical Paper 2009-01-0943, 2009, https://doi.org/10.4271/2009-01-0943. Download Citation
Timothy T. Diller, Ronald D. Matthews, Matthew J. Hall, Timothy H. DeFries, Brent Shoffner
The University of Texas at Austin
SAE World Congress & Exhibition
Emissions Measurement and Testing, 2009-SP-2256