Universal EV charging on the go

Providing energy to EV vehicles as they run is a challenge. Some e-highway systems in Europe provide power for trucks similar to electric trains. A pantograph above the truck draw power from dual overhead contact lines. One line provides the positive feed, while the second acts as the negative return path to ground to complete the circuit. But this setup won't work for cars - the height difference is too much.

What about a system with two conductive colinear charging rollers under the vehicle, one behind the other? The rollers are conductive and contact a slightly-raised 'charging rail' embedded in the road. The rail is comprised of separate charging segments, each of which can switch its voltage to high or ground. The rail is also intelligent - it communicates with the vehicle and predicts its position in time. That way, the rail switches the correct segment to high voltage (and the others to ground) just as the vehicle's two rollers pass over two charging rail segments. Any long-enough vehicle, from truck to car, could use this method to be gain energy.

There's a somewhat similar project in Sweden called the eRoadArlanda project - there, two parallel tracks in the road feed electricity into the vehicle. My idea uses a single rail with two rollers seperated by the vehicle length contacting electrically-isolated sections of the rail.

The first use of this may be to safely and automatically charge EV cars in your garage (or on-street charging bays) without having to manually plug it in.