Development and Demonstration of a Class 6 Range-Extended Electric Vehicle for Commercial Pickup and Delivery Operation: Preprint

Matthew Jeffers, Eric Miller, Kenneth Kelly, John Kresse, Ke Li, Jesse Dalton, Michael Kader, Cole Frazier

Research output: Contribution to conferencePaper


Range-extended hybrids are an attractive option for medium- and heavy-duty commercial vehicle fleets because they offer the efficiency of an electrified powertrain with the driving range of a conventional diesel powertrain. The vehicle essentially operates as if it was purely electric for most trips, while ensuring that all commercial routes can be completed in any weather conditions or geographic terrain. Fuel use and point-source emissions can be significantly reduced, and in some cases eliminated, as many shorter routes can be fully electrified with this architecture. Under a U.S. Department of Energy (DOE)-funded project for Medium- and Heavy-Duty Vehicle Powertrain Electrification, Cummins has developed a plug-in hybrid electric Class 6 truck with a range-extending engine designed for pickup and delivery application. The National Renewable Energy Laboratory (NREL) assisted by developing representative workday drive cycles for Class 6 operation and an adapted cycle to enable vehicle track testing. A novel, automated driving system was utilized by Southwest Research Institute (SwRI) to improve the repeatability of the track testing conducted to quantify vehicle energy consumption. Cummins used a drivetrain model to design the hybrid control system for increased fuel savings. The control system functionality and fuel savings objective of 50% or more were confirmed by track testing described in this paper.
Original languageAmerican English
Number of pages10
StatePublished - 2020
Event2020 SAE International WCX Digital Summit -
Duration: 16 Jun 202018 Jun 2020


Conference2020 SAE International WCX Digital Summit

Bibliographical note

See NREL/CP-5400-75847 for paper as published in proceedings

NREL Publication Number

  • NREL/CP-5400-78181


  • class 6 range extender
  • commercial electric vehicles
  • heavy-duty vehicle electric vehicle
  • medium-duty vehicle
  • range-extended hybrid electric vehicle


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