In-Use and Vehicle Dynamometer Evaluation and Comparison of Class 7 Hybrid Electric and Conventional Diesel Delivery Trucks

Jonathan Burton, Kevin Walkowicz, Petr Sindler, Adam Duran

Research output: Contribution to conferencePaperpeer-review

13 Scopus Citations


This study compared fuel economy and emissions between heavy-duty hybrid electric vehicles (HEVs) and equivalent conventional diesel vehicles. In-use field data were collected from daily fleet operations carried out at a FedEx facility in California on six HEV and six conventional 2010 Freightliner M2-106 straight box trucks. Field data collection primarily focused on route assessment and vehicle fuel consumption over a six-month period. Chassis dynamometer testing was also carried out on one conventional vehicle and one HEV to determine differences in fuel consumption and emissions. Route data from the field study was analyzed to determine the selection of dynamometer test cycles. From this analysis, the New York Composite (NYComp), Hybrid Truck Users Forum Class 6 (HTUF 6), and California Air Resource Board (CARB) Heavy Heavy-Duty Diesel Truck (HHDDT) drive cycles were chosen. The HEV showed 31% better fuel economy on the NYComp cycle, 25% better on the HTUF 6 cycle and 4% worse on the CARB HHDDT cycle when compared to the conventional vehicle. The in-use field data indicates that the HEVs had around 16% better fuel economy than the conventional vehicles. Dynamometer testing also showed that the HEV generally emitted higher levels of nitric oxides than the conventional vehicle over the drive cycles, up to 77% higher on the NYComp cycle (though this may at least in part be attributed to the different engine certification levels in the vehicles tested). The conventional vehicle was found to accelerate up to freeway speeds over ten seconds faster than the HEV.

Original languageAmerican English
Number of pages10
StatePublished - Oct 2013
EventSAE 2013 Commercial Vehicle Engineering Congress - Rosemont, Illinois
Duration: 1 Oct 20133 Oct 2013


ConferenceSAE 2013 Commercial Vehicle Engineering Congress
CityRosemont, Illinois

NREL Publication Number

  • NREL/CP-5400-60098


  • dynamometer testing
  • Fedex
  • field data
  • fuel consumption
  • heavy hybrid
  • hybrid electric vehicles (HEV)


Dive into the research topics of 'In-Use and Vehicle Dynamometer Evaluation and Comparison of Class 7 Hybrid Electric and Conventional Diesel Delivery Trucks'. Together they form a unique fingerprint.

Cite this