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SAE International Announces the SAE J2954 Wireless Charging Test Station, a Major Step Forward in Global Standardization for EVs

At a standards meeting held in January at AUDI AG in Ingolstadt, Germany, carmakers, Tier 1 suppliers, and technology providers from around the world have reached agreement on key technical and procedural elements of the upcoming SAE Recommended Practice (RP) Wireless Power Transfer (WPT) and automated parking alignment and charging of electrified vehicles.

The goal of this standardization is to ensure interoperability and performance between the wide range of electrified vehicles being developed by carmakers worldwide, and the wireless charging stations that will be widely deployed to streamline the charging of the next generation of EV’s and PHEV’s.  The SAE J2954 Taskforce, chaired by Jesse Schneider, has been working since 2010 to develop the specifications and standards needed to achieve seamless interoperability.

“Charging your vehicle should be as simple as parking it and walking away—and wireless charging with SAE J2954 enables that freedom and convenience to do this automatically”, says Mr. Schneider.  “Automakers believe that wireless charging can greatly help to make both electrified and autonomous vehicle mainstream, and they have been active supporters of our standardization efforts.  Reaching a decision for a common J2954 RP test station, equipped with circular topology, provides automakers with the technical direction for their wireless charging system design, development and production release plans to meet industry compatibility, interoperability and performance standards.   It is a major step forward for the industry.”

The Taskforce members have agreed on specifications for the SAE J2954 Test Stations, which automakers will use as a basis to develop their wireless charging systems, and to verify that they will interoperate with charging systems and vehicles sold by other makers.  The Taskforce agreed that the WPT1 (3.7 kW) circular coil system and the WPT2 (7.7 kW) circular coil system will be in the Test Stations used to test products developed by car makers, Tier 1 suppliers, and charging infrastructure suppliers to confirm SAE J2954 compatibility.  These wireless charging systems charge at the same rate that existing Level 1 and Level 2 wired chargers operate.

Earlier in 2016, SAE International performed bench testing of these systems at the US Department of Energy’s Idaho National Laboratory and TDK to confirm that charging rates, efficiency, and emissions can meet regulatory guidelines and consumer expectations.  Testing results validated interoperability between different coils (both circular and DD) with high efficiency. This enabled the RP SAE J2954 test station to have a greater degree of freedom to prove interoperability with other topologies with newly established interoperability criteria. The goal is to standardize key elements but at the same time “keep the door open” for innovations in wireless automated charging in the future.

The consensus reached by the Taskforce enables carmakers the freedom to design the components for their own vehicles based on their preference for coil topology and power electronics design, while assuring that such systems will interoperate with the charging source that is deployed on the ground.

In 2017, the Taskforce will decide on other aspects of the standard, including standardization for wireless charging systems capable of WPT3 (11 kW) charge rates.  The specifications of the SAE Test Station and procedures for validation for both the vehicle and infrastructure chargers will be defined in the SAE J2954 Recommended Practice to be published later this year.  The final SAE J2954 Standard is to be published in 2018 based on actual vehicle test data.

On February 6th at the Center for Sustainable Energy in San Diego (the day before the SAE Hybrid Forum), the SAE J2954 Taskforce is having a technology forum to discuss standardization, status and plans for vehicle testing, and implementation of wireless charging systems with CARB, CEC, and the public.

Jan 27, 2017Blagojce Krivevski
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Blagojce Krivevski

Blagojce Krivevski is physicist and green technology lover. Keep in touch with Blagojce through his email, web site, Twitter, Linkedin, Facebook and Google+.

January 27, 2017 Electric Car NewsEV Charging, SAE, Sae International, SAE J2954, Wireless Charging, Wireless EV Charging
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