For the first time in the US, a motorway 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 in West Lafayette.
Purdue researchers demonstrated the wireless charging system this fall using an electric semitractor provided by Cummins.
“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 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 on 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 US. so far. Using the test segment in West Lafayette, this system delivered 190kW to a truck traveling at 65 miles per hour.
“To put that in perspective, 200kW is 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 US 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.
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.
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.
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.”