Quantitative Effects of Vehicle Parameters on Fuel Consumption for Heavy-Duty Vehicle

Lijuan Wang, Kenneth Kelly, Kevin Walkowicz, Adam Duran

Research output: Contribution to conferencePaperpeer-review

7 Scopus Citations


The National Renewable Energy Laboratory's (NREL's) Fleet Test and Evaluations team recently conducted chassis dynamometer tests of a class 8 conventional regional delivery truck over the Heavy Heavy-Duty Diesel Truck (HHDDT), West Virginia University City (WVU City), and Composite International Truck Local and Commuter Cycle (CILCC) drive cycles. A quantitative study analyzed the impacts of various factors on fuel consumption (FC) and fuel economy (FE) by modeling and simulating the truck using NREL's Future Automotive Systems Technology Simulator (FASTSim). Factors included vehicle weight and the coefficients of rolling resistance and aerodynamic drag. Simulation results from a single parametric study revealed that FC was approximately a linear function of the weight, coefficient of aerodynamic drag, and rolling resistance over various drive cycles. The study of the impact of two technologies on FE suggested that, depending on the circumstances, it may be more cost effective to reduce one parameter (such as coefficient of aerodynamic drag) to increase fuel economy, or it may be more beneficial to reduce another (such as the coefficient of rolling resistance). It also provided a convenient way to estimate FE by interpolating within the parameter values and extrapolating outside of them. The simulation results indicated that FC could be reduced from 38.70 L/100 km, 50.72 L/100 km, and 38.42 L/100 km in the baseline truck to 26.78 L/100 km, 43.14 L/100 km and 29.84 L/100 km over the HHDDT, WVU City and CILCC drive cycles, respectively, when the U.S. Department of Energy's three targeted new technologies were applied simultaneously.

Original languageAmerican English
Number of pages8
StatePublished - 2015
EventSAE Commercial Vehicle Engineering Congress, COMVEC 2015 - Rosemont, United States
Duration: 6 Oct 20158 Oct 2015


ConferenceSAE Commercial Vehicle Engineering Congress, COMVEC 2015
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© Copyright 2015 SAE International.

NREL Publication Number

  • NREL/CP-5400-64049


  • class 8
  • delivery trucks
  • drive cycles
  • fuel consumption
  • fuel economy


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