According to the technology website Gizmag, in order to strengthen industry norms and guidance, the International Society of Automated Engineers (SAE International) has released the industry standard for hybrid and all-electric wireless charging technology, which is the first industry in wireless charging for electric vehicles. Standard, groundbreaking.
SAE International (Society for Automotive Engineers) is a technical society with more than 143,000 members worldwide. Its members are engineers and related technical experts in the aerospace, automotive and commercial vehicle industries. The newly introduced industry standard is referred to as “SAE TIR J2954â€, which is intended to establish specifications for light plug-in and all-electric vehicle wireless charging technology, and implement unified standards throughout the industry to strengthen industry management and guidance.
The current SAE J1772 standard is a specification for plug-in charging and is used by most car manufacturers. Automakers accepting the new TIR J2954 wireless charging standard include Daimler (BMW), Fiat-Chrysler, Ford, GM, Honda, Jaguar Land Rover, Mitsubishi, Nissan and Toyota. The automakers of these signed automakers currently account for the vast majority of the market. It is reported that some of the original equipment manufacturers (OEMs) in the industry supply chain, such as Delphi, LG, Panasonic, Tokyo Electric Chemical TDK, etc. have also signed a new wireless charging agreement. At the same time, manufacturers of plug-in systems for buses, including Volvo, BYD, and Proterra, the American electric bus company, also signed the agreement.
This new SAE standard is designed to develop a wireless charging protocol for passenger cars. The standard has established the Wireless Power Transfer (WPT) protocol for low-speed charging, and has added additional space for other problems, such as high-speed charging mode, through the appendix. According to reports, the new standard will be officially announced online at the electric car conference in Logan, Utah, USA on May 31, 2016.
According to reports, SAE TIR J2954 specifies 85 KHz (kHz, 81.39-90kHZ) is the frequency band commonly used in light-duty vehicle charging systems. At present, the new agreement stipulates four levels of plug-in and all-electric vehicle wireless energy transmission levels, but future revisions of the agreement can add more levels. After clearing the wireless charging band, a wireless charger produced by an automobile manufacturer can be compatible with wireless charging devices from different manufacturers and charging stations. As J1772 allows Nissan to use the same charger with Mitsubishi, the new J2954 regulation will allow Toyota to share wireless charging stations with BMW, bringing great convenience to consumers.
According to reports, the names of the four charging levels are WPT1-4, but only two levels are clearly defined in the current file, and the other two levels will be used in the future. WPT 1 specifies a charging capacity (speed) of 3.7 kW, while WPT 2 specifies a charging capacity of 7.7 kW. Currently, these two standards are being tested by the Idaho Energy Department's experimental team and the Argonne National Labs. At present, bench testing is underway, and real-time on-board power grid testing is also underway. According to reports, the wireless charging standard plan will be completed in 2018.
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