CHARGE AS YOU DRIVE: Honda Develops Highway Technology That Could Power EVs Without Stopping
Honda has developed technology capable of wirelessly supplying electricity to electric vehicles — including 20-ton commercial trucks — while they are traveling down the road, with the Japanese automaker preparing for highway trials that could eventually allow EVs to recharge without pulling into a charging station.
The system places power-transmitting equipment beneath the pavement and installs a receiver on the vehicle. As an equipped vehicle passes over the roadway, electricity is transferred wirelessly through magnetic coupling, potentially allowing the battery to recharge while the vehicle remains in motion.
Honda R&D, the automaker’s research and development subsidiary, developed the technology together with Japanese construction giant Taisei Corporation and road-construction company Taisei Rotec Corporation. The three companies have been working jointly on the project since 2025.
Honda says dynamic wireless power transfer could address one of the major practical drawbacks of electric vehicles: the need to stop and recharge. Instead of relying exclusively on home chargers or conventional charging stations, an EV could receive additional power during portions of an ordinary trip.
Honda sees particularly significant potential for the trucking and transportation industries, where lengthy charging stops can reduce the amount of time a commercial vehicle can remain in service. The company therefore intends to focus initially on putting the technology to practical use in logistics and transportation.
The system combines technologies developed by each of the three companies. Honda R&D developed the high-power-density transmitting and receiving units and the vehicle-side system, Taisei developed the high-response direct-current power supply, and Taisei Rotec developed techniques for embedding the charging equipment beneath the roadway.
The road itself contains multiple ground assembly units connected through a direct-current distribution system. A corresponding vehicle assembly receiver mounted on the EV collects the energy as the vehicle travels over the embedded equipment.
Honda and its partners have already conducted tests on a private roadway at Taisei Group’s T-FIELD/SATTE research facility, examining not only whether the system can transfer electricity effectively, but whether the pavement and embedded equipment can withstand the punishment of everyday heavy-vehicle traffic.
One of the major engineering challenges is ensuring that charging hardware buried beneath a highway can survive repeated use by large trucks. The companies say they have developed pavement structures and embedded units intended to withstand commercial vehicles with a gross vehicle weight of approximately 20 tons.
A new phase of testing is scheduled to begin late this year at Taisei Group’s T-FIELD/TAMURA testing facility. There, engineers plan to subject the system to long-term durability testing equivalent to one million wheel loads using actual vehicles.
The companies will simultaneously test how effectively electricity can be transferred to moving vehicles and examine methods of limiting electromagnetic-field leakage from the charging equipment buried beneath the road.
Later testing will push the technology further, including trials of power delivery at up to 150 kilowatts — an output level intended to make the system potentially practical for large commercial vehicles rather than merely passenger cars.
Engineers also intend to determine whether power can be transferred reliably when vehicles are moving at highway speeds, an essential hurdle before the technology could be deployed on major expressways.
The most significant test is expected to begin during Japan’s 2027 fiscal year, which starts April 1, 2027, when Honda and its partners plan to move from private test tracks onto an operating highway.
The companies will participate in the “Tateyama Project,” an initiative being led by East Nippon Expressway Company, known as NEXCO East, on the E14 Tateyama Expressway in Chiba Prefecture.
The project is expected to be Japan’s first demonstration of dynamic wireless power transfer on the main lanes of an expressway in an actual traffic environment. The test area is planned for the vicinity of the Kimitsu parking area on the Tateyama Expressway.
Honda and Taisei will not be the only major companies participating. A separate team consisting of Toyota, Denso and Obayashi Corporation has also been selected for the project, allowing different approaches to in-motion wireless charging to be evaluated under real highway conditions.
Honda has been researching dynamic wireless power-transfer technology since 2021 as part of its broader effort to expand EV charging options. The company says the technology is intended to complement, rather than necessarily replace, conventional charging infrastructure and improvements in battery technology.
A road capable of supplying electricity while vehicles travel could theoretically have another important benefit: reducing the amount of battery capacity an EV needs to carry. If vehicles can replenish energy during a journey, manufacturers may eventually be able to rely on smaller batteries for certain applications, potentially reducing vehicle weight and battery costs.
The biggest unanswered question, however, may be the price of transforming ordinary highways into charging infrastructure. Installing power supplies, wiring and charging equipment beneath miles of pavement would require substantial construction and maintenance, and Honda has not said how much such a network would cost.
A Honda engineer declined to provide an estimate of how the economics would compare with building a conventional network of high-speed charging stations, saying the financial viability of the technology still needs to be evaluated.
The coming tests will therefore determine far more than whether an EV can technically collect electricity while speeding down a highway. Honda and its partners must establish that the equipment can survive years beneath heavily traveled roads, safely deliver large amounts of electricity at highway speeds and ultimately make economic sense on a scale large enough to justify installing it beneath public highways.
{Matzav.com}
