• Jan 11th 2011 at 9:02AM
  • 7
Back in October, the Society of Automotive Engineers (SAE) assigned a task force to standardize the wireless charging of plug-in vehicles. In November, the task force announced its goal of finalizing the SAE J2954 wireless charging guidelines by end of 2011 and enforcing this standard by 2013. The SAE standard will establish performance and safety limits for wireless power transfer in automotive applications. The task force is currently reviewing several wireless charging methods, including inductive and magnetic resonance.

The SAE will conduct tests of wireless charging systems on light-duty passenger vehicles and commercial buses. The J2954 team will evaluate wireless Level 1, 2, and 3 chargers. The SAE's task force consists of automakers, commercial bus producers, wireless charger manufacturers, government agencies, suppliers and universities. In addition, the SAE has established a working relationship with the International Organization for Standardization (ISO) and VDE (Germany's standardization organization) to ensure that wireless charging systems have at least a fair degree of global compatibility. Hat tip to Yishaii!

[Source: Green Car Congress]

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    • 1 Second Ago
      • 4 Years Ago
      I'd rather just plug in . . . it takes all of 5 seconds. But if this helps EV adoption, I'm all for it.
        • 4 Years Ago
        One of the main advantages of inductive (wireless) charging is the ability to charge while in motion (preferably at low speeds or even at stop lights).
      • 4 Years Ago
      I wonder why no one has proposed a "pipe-less petrol transfer system" yet. That would be equally well justified and practical.

      And, if we used 100x larger tanks at the input (pump) and the output (car) we could throw petrol a lot further without spilling nearly as much as we did with ordinary tanks! (yes, that's an analogy to the resonant power transfer)
        • 4 Years Ago
        My point is that a car charger is not a gadget. There are several kW of power to transfer from the charger to the car. If only several percent of this power gets lost "in the air" we are talking about hundreds of watts of power in radiation or heating up everything around. This is particularly true in long distance resonant systems - they are only efficient if the environment around the transmission coil is well controlled (that is, there is no water or metal objects nearby).

        I may consider a wireless phone charger a gadget (albeit stupid, is it really that much more difficult to place a cellphone on a cradle instead of on a charging pad?) but that application doesn't trigger alarms in my head. Yes, it is inefficient, it may interfere with some other wireless systems but it will not cause you any harm, not more than the cellphone itself, anyway. But doing the same with a car charger (especially if a resonant solution is used) is IMO irresponsible.

        The only "wireless" solution that could work is a very short range inductive coupling (effectively a contact type solution, not unlike a transformer). This way we could eliminate exposed electrical contacts and make the system 100% spark proof. But it would also require a much larger, clunky ferrite "connector" so I'm not sure if it was any more practical solution than a traditional plug and socket.
        • 4 Years Ago
        Despite what I said in the original post, many people will like the wireless setup.

        It will eliminate much fussing and complaining from the female population like: "I don't want to plug it in." "That dumb cord is in the way".
      • 4 Years Ago
      The Volt's charger only get 80% efficiency in its current (not wireless) configuration. Seems like charging efficiency really needs to be improved but I doubt going wireless is going to help.
      • 4 Years Ago
      Many of the 1997-2002 EV cars produced for the CARB ZEV mandate used inductive charging. Toyota and GM eventually settled on the GM Magne Charge paddle, http://en.wikipedia.org/wiki/Magne_Charge , but "Magne Charge support was withdrawn by General Motors in 2002,[3] after the California Air Resources Board settled on a conductive charging interface for electric vehicles in California in June, 2001.[4][5]".

      Note that with the 2000 inductive charging you STILL had to plug in a chunky cable. And SAE J1772 has always been safe, no current flows unless the car and charging station complete the handshake protocol. So there really has been no reason to prefer inductive charging. And inductive charging while the car is on the go is a fantasy unless you waste a lot of energy. It would be nice to have some system that opportunistically charges a nearby vehicle without the owner doing anything, but cost, economics, and physics all work against it. The only role I foresee for this is giving EV buses a quick boost at a bus stop.
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