Wireless In-Road Charging Under Development At Clemson University
Clemson University’s International Center for Automotive Research (CU-ICAR), in collaboration with Oak Ridge National Laboratory, ITIC, Toyota, Cisco, Duke Energy and Evatran, developed a stationary wireless power transfer test bed.
For the first phase of the project, ICAR uses Toyota electric cars – Scion iQ EV.
The prototype of wireless charging was capable of transferring 6.9 kW at 85+ percent efficiency.
“The test bed has been part of a major collaborative R&D initiative that recently passed a formal project review by the U.S. Department of Energy (DOE).
The ITIC facility becomes one of the first operating wireless charging test beds in the U.S., where entities may use its capabilities as an R&D service. Entities can do this without a business partner that has previously researched new wireless charging technology and services.
This achievement opens the door for ITIC to begin marketing wireless charging test and development services to automotive manufacturers, suppliers and related technology companies. It also allows program collaborators to move forward with the next project phase: the testing of wireless charging of moving electric vehicles (dynamic or in-motion wireless charging). Those tests will begin later this fall in a program directed by CU-ICAR at ITIC.
The first test demonstrated wireless power transfer systems integrated into two different Toyota vehicle models. One of the vehicles was tested at a power transfer rate of 6.9 kilowatts and achieved an overall efficiency of greater than 85 percent. The systems tested used wireless power transfer technology developed by Oak Ridge National Laboratory and communication tools developed in collaboration with Cisco.
The wireless power transfer project development started in 2013 after Oak Ridge National Laboratory (ORNL) received an $8.1 million grant from the Department of Energy. ORNL subcontracted CU-ICAR to develop the grid-side and vehicle-side communication system for wireless charging, and researched the potential impact of electromagnetic fields.
CU-ICAR partnered with ITIC to develop a physical test bed to support the testing of the vehicle and infrastructure interaction during the wireless charging process.
The Virginia-based company Evatran integrated the coil systems and power electronics components developed by ORNL into the test vehicles provided by Toyota. CU-ICAR and Cisco collaborated on the development of the communication radios, both in the vehicles and on the roadside. Duke Energy provided the grid connectivity and the power supply infrastructure. CU-ICAR guided ITIC in the layout and design of the physical test bed, and in the development and monitoring of the test procedures.”
The second stage is in-road dynamic wireless charging – Dynamic Wireless Charging (DWC), which could soften energy draw from the battery and increase range.
Dynamic charging is much more complicated, so the first goal is to develop a system for EVs moving at speeds lower than 35 mph.
“…a built-out option already has been identified on a mile-long straightaway road segment to test dynamic wireless charging at higher speeds. The ITIC test bed has been prepared to also support higher power levels of up to 250 kilowatts.”