SAE J2954 Wireless Charging on track to make decision for WPT 2 (7.7kW) in January; planned commercialization in 2020
In a program track on Charging Infrastructure at the World of Energy Solutions Conference in Stuttgart, Germany this week, Jesse Schneider (BMW), SAE Taskforce Chair, Wireless Power Transfer and Alignment Methodology, presented the recently published SAE TIR, Wireless Power Transfer (WPT) for Light-Duty Plug-In/ Electric Vehicles and Alignment Methodology (earlier post) along with plans for standardization by 2018 to support commercialization. The SAE TIR J2954 contains a normative specification for both the vehicle and infrastructure side coils for the power level WPT 1 up to 3.7kW and informative specifications for WPT 2 to 7.7kW.
The current timing plan projects a commercial rollout of Wireless Power Transfer infrastructure by 2020. The SAE J2954 Standardization plan includes coordinated bench and vehicle testing, industry consensus work (standards documents) and three milestones from 2016-2018 in support of commercialization of wireless power transfer.
Currently, there is bench testing underway at Idaho National Lab (INL) between automotive and supplier WPT systems, coordinated by the SAE J2954 Team and the US Department of Energy (DOE). The bench testing has made significant headway to validate both the WPT 1 and WPT 2 specifications in J2954. The interim results have shown that the individual systems work very well to safely transfer power at high efficiencies (i.e. 85%-95%).
At this time the testing is investigating “interoperable” conditions between different supplier systems also at different power levels. Test results will be available in December to the SAE J2954 team with the purpose to help find consensus on the standardization of WPT 2.
The upcoming Recommended Practice SAE J2954 will also contain a normative specification WPT 2 (7.7kW)—or concept freeze—made in 2017 for SAE J2954. WPT 3 (up to 11kW) will also be specified as an informative appendix. In order to finish the standard, vehicle level testing is being proposed to validate WPT 1-WPT3 from 2017-2018.
Also, for the first time, SAE and ISO will work together for standardization of wireless charging with the goal of creating “one common standard” with the content being shared by both SAE J2954 and ISO 19363.
The SAE J2954 TIR, gives the wireless power transfer specification for both the vehicle and the infrastructure. The testing projects underway with the US DOE and the industry were designed to give the SAE Wireless Power Transfer Taskforce the background for the WPT 1 and WPT 2 power levels in first quarter of 2017 for the next phase of standardization, Recommended Practice J2954.—Jesse Schneider (BMW), Chair of the SAE Wireless Charging Taskforce