WEST LAFAYETTE, Ind. — For the first time in the U.S., a roadway has wirelessly charged an electric heavy-duty truck driving at highway speeds, demonstrating key technology that could help lower the costs of building electrified highways for all electric vehicles to use.
The experimental highway segment tests a patent-pending system designed by Purdue University engineers. The segment, built by the Indiana Department of Transportation (INDOT), is a quarter-mile stretch on U.S. Highway 52/U.S. Highway 231 in West Lafayette. Purdue researchers demonstrated the wireless charging system this fall using an electric semitractor provided by Cummins.
The team also partnered with AECOM; White Construction, Inc.; and PC Krause and Associates, Inc. on developing and implementing various parts of the system.
“With this breakthrough system, Purdue has shown that powering large commercial vehicles wirelessly is not just technically feasible but could be a practical and scalable solution for real-world highway transportation,” said Nadia Gkritza, a Purdue professor of civil and construction engineering and agricultural and biological engineering.
The demonstration is part of a multistage research project that Purdue and INDOT began in 2018. In addition to its funding from INDOT through the Joint Transportation Research Program at Purdue, the project is affiliated with a fourth-generation National Science Foundation Engineering Research Center called Advancing Self-sufficiency through Powered Infrastructure for Roadway Electrification (ASPIRE).
“INDOT is proud to partner with Purdue on this project,” said INDOT Commissioner Lyndsay Quist. “While there is still more to explore, we are seeing what the future could hold for heavy-duty EV charging and transportation.”
The Purdue system demonstrates “dynamic wireless power transfer,” with “dynamic” referring to vehicles in motion. A few other states and countries have also begun testing roads designed to enable dynamic wireless power transfer. But making this possible for highways — and particularly for semis and other heavy-duty vehicles — is a unique challenge. Because vehicles travel so much faster on highways than city roads, they need to be charged at higher power levels.
The Purdue-designed wireless charging system works at power levels much higher than what has been demonstrated in the U.S. so far. Using the test segment in West Lafayette, this system delivered 190 kilowatts to a truck traveling at 65 miles per hour.
“To put that in perspective, 200 kilowatts are on the scale of about a hundred homes,” said Steve Pekarek, Purdue’s Edmund O. Schweitzer, III Professor of Electrical and Computer Engineering.
Why design electrified highways for trucks first?
By accommodating the higher power needs for heavy-duty vehicles, the Purdue design is also able to support the lower power needs of other vehicle classes.
“This is a system designed to work for the heaviest class of trucks all the way down to passenger vehicles,” said Aaron Brovont, a research assistant professor in Purdue’s Elmore Family School of Electrical and Computer Engineering.
Since trucking contributes the most to U.S. gross domestic product compared to other modes of freight transportation, lowering costs for heavy-duty electric trucks could help attract more investment into electrifying highways that all vehicle classes would share. If electric heavy-duty trucks could charge or stay charged using highways, their batteries could be smaller in size and they could carry more cargo, significantly reducing the costs of using EVs for freight transportation.
Electrified highways could also allow the batteries of passenger cars to be smaller.
“Two of the big barriers to electric vehicle adoption, at least to the public, are range anxiety — ‘Oh, my gosh, where am I going to charge the battery on this car?’ — and the second thing is cost,” said John Haddock, a professor in Purdue’s Lyles School of Civil and Construction Engineering. “And a lot of that cost in electric vehicles is driven by the size of the battery packs that they have to have in order to get you that 250-to-300-mile range. With this system, you’d be able to drive your vehicle down the road and it would charge the battery.”
Highways that charge EVs like a smartphone
The system Purdue researchers designed allows highway pavement to provide power to EVs similarly to how smartphones use magnetic fields to wirelessly charge when placed on a pad.
“Transferring power through a magnetic field at these relatively large distances is challenging. And what makes it more challenging is doing it for a heavy-duty vehicle moving at power levels thousands of times higher than what smartphones receive,” said Dionysios Aliprantis, a Purdue professor of electrical and computer engineering.
The team installed transmitter coils in specially dedicated lanes within the concrete pavement. The coils send power to receiver coils attached to the truck’s underside.
“Cummins is proud to play a role in this initiative by successfully adapting a prototype Class 8 battery-electric truck to integrate with Purdue’s high-power dynamic wireless power transfer system,” said John Kresse, chief technology engineer at Cummins. “The on-road testing went exceptionally well, thanks to strong collaboration between our teams. With its high power and promising cost structure, this technology represents a practical, and potentially game-changing, solution for the future of on-highway commercial transportation.”
Other wireless EV charging efforts are also using transmitter and receiver coils, but they haven’t been designed for the higher power levels that heavy-duty trucks need. The Purdue-designed coils accommodate a wider power range — larger vehicles wouldn’t need multiple low-power receiver coils on the trailer to charge from the road, which has been proposed to meet the high-power demands. Instead, in the Purdue design, a single receiver coil assembly is placed under the tractor, greatly simplifying the overall system.
Purdue researchers have also designed the transmitter coils to work within concrete pavement, which often carries the heaviest traffic even though it only makes up 20% of the U.S. interstate system. 
The Indiana Department of Transportation embedded these Purdue-designed coils before covering them with concrete highway pavement. The coils transmit power to receiver coils attached to the underside of an electric heavy-duty truck. (Purdue University photo/Kelsey Lefever)
Most real-world deployments of wireless pavement charging in the U.S. are led by members of ASPIRE. Purdue is a founding member of ASPIRE, and Gkritza is the campus director of ASPIRE’s Purdue location.
Headquartered at Utah State University, ASPIRE integrates academia, scientific research, and real-world tests and deployments across more than 400 members from 10 partner universities: Purdue, the University of Colorado Boulder, the University of Texas at El Paso, the University of Auckland in New Zealand, Colorado State University, the University of Colorado Colorado Springs, Virginia Polytechnic Institute and State University, Cornell University, and the University of Utah. These universities are joined by more than 70 industry, government and nonprofit members across all sections of the electric transportation ecosystem, as well as community partners and advisors.
“This achievement reflects how our growing ecosystem connects public agencies, private industry and academic research to turn electrification goals into reality, demonstrating the kind of collaboration that strengthens the foundation for scaling intelligent electrified transportation systems nationwide,” said Don Linford, ASPIRE’s director of industry and ecosystem engagement at Utah State University.
Developing the industry standard for building electrified highways
The team’s system has also been part of further testing to help develop industry standards for dynamic wireless power transfer. The hope is that these standards would encourage the industry to adopt the technology, which is a critical step needed for roadway operators and departments of transportation in each state to consider investing in infrastructure enabling EVs to charge while driving. The researchers additionally plan to demonstrate their design for a variety of vehicle classes, including light-duty passenger cars and trucks.
ERectangular receiver pads are visible in the lane that an electric truck equipped with receiver coils would use to charge as it drives. (Purdue University photo/Kelsey Lefever)
In April, the Purdue team received the Technology Innovation Award at the IEEE PES Energy and Policy Forum Innovation Showcase for their work on this system.
“This project is a flagship example of a successful public-private partnership, positioning Purdue and ASPIRE for long-term leadership in electrified transportation,” Gkritza said. “It’s also been a remarkable ‘lab-to-life’ learning experience for our students — an opportunity to see how fundamental research can translate into real-world infrastructure.”
The researchers have disclosed their innovation to the Purdue Innovates Office of Technology Commercialization, which has applied for a patent on the intellectual property. Industry partners interested in developing or commercializing the work should contact Matt Halladay, senior business development manager and licensing manager, physical sciences, at mrhalladay@prf.org about track codes 2022-ALIP-69682, 2024-PEKA-70401 and 2024-PEKA-70402.
