eRoadArlanda, the road that charges electric vehicles, plots its course

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Imagine vehicles connected to electric rails placed in the middle of traffic lanes and thus effortlessly recharging simply by driving. This is precisely the concept of eRoadArlanda, a two-kilometer stretch built especially for this purpose in Sweden and tested since 2018.

In order to be able to recharge while driving, vehicles must be equipped with a type of pad placed at the end of an arm Mobile fixed to the bottom of the chassis, which automatically connects to the rails laid out in its path. Initially, this system is being tested on trucks, but the idea is, of course, to be able to adapt it to buses and electric cars. The arm actually detects when the vehicle is over the rail and then automatically docks there. Likewise, in the event of a change in trajectory or overtaking, it “turns off” without any action by the driver.

This project is part of the Swedish government’s plan to establish a completely fuels fossils by 2030. This type of road should be expanded in the country, with the aim of electrifying up to 2,000 km of tracks by 2030.

A solution that is emulated

It can also give ideas to others, although so far the charging systems tried from the ground are essentially inductive. At the beginning of the year, the group Stellantis announced that it was testing advanced transfer technology in Italyenergy wireless and inductive eletric cars, in a circuit specially created for this type of test. In this case, it foreshadows the type of infrastructure that will be able to equip certain roads in the future, thus enabling considerable autonomy. It is, in fact, a technology based on a succession of loops placed under the asphalt that transmit energy directly to the vehicles that pass over it. However, each vehicle must be equipped with a dedicated receiver, responsible for transferring energy from the road infrastructure directly to the electric motor. Following the same principle, in Karlsruhe, Germany, an entire stretch of road will be equipped, along a few hundred meters, to supply power to the city’s electric buses while they are in transit.

For its part, the Spanish company Premium PSU presented a new system designed to recharge your car by placing it directly at a dedicated station, knowing that this system works both when the vehicle is stationary and when it is moving. Note that in 2018, BMW also launched its own wireless charging solution when stationary, for plug-in hybrid vehicles of brand. By induction or with the help of a skateboard, the solution to increase the autonomy of electric cars may take a day on the road itself.

eRoadArlanda, the first road that charges electric cars

article of Marc Zaffagni on 04/16/2018

Sweden has just opened a two-kilometer stretch of road that incorporates an electric vehicle charging system while driving. Inspired by the tram, this device will be tested for two years in real conditions.

By 2030, Sweden has set a goal of no longer usingfossil fuels for transport. To meet this ambitious challenge, the country will notably accelerate the adoption of electric vehicles. And to facilitate this movement, battery charging infrastructure must be not only dense but complementary. It is in this perspective that what is presented as the first electrified road in the world designed to charge electric vehicles while they are on the move.

eRoadArlanda, that’s its name, is a two-kilometer stretch that consists of an electrified track built into the road in its central part. Vehicles connect to it via a mobile contactor housed under the chassis. The latter is managed by sensors and deploys only when the rail is detected. And if the driver has to overtake or in case ofaccident, the skid automatically retracts. Connected to the ground, the electrified rail sends current through short sections as the vehicle passes.

Sweden has 20,000 km of roads

This system is a derivative of the one used by some trams, mainly in France. eRoadArlanda connects Stockholm-Arlanda Airport to the Rosersberg logistics area outside the capital. For now, only one PostNord electric truck will use this section during this test, which is scheduled to last two years.

If successful, the Swedish transport administration plans to extend the network to motorways and main roads. According to eRoadArlanda, the cost of implementing this system on the 20,000 kilometers of the Swedish road network would be 7.6 billion euros. But thanks to the 3 billion euros of savings Yearly in energy fossilsThe electric road would be amortized in just under three years.

Will electric cars soon be powered by roads?

Initial article by Quentin Mauguit, published 7/11/2012

An original solution is being developed in Japan to reinforcement autonomy of electric cars. The idea is relatively simple: we could not permanently transmitwireless electricity on the roads, in particular thanks to an induction system? The first tests are, in any case, conclusive.

the maximum of eletric cars current suffer from a reduced autonomy and, above all, from a recharge time very long. Many teams around the world are therefore working to reduce these limiting factors as much as possible. One of the solutions considered would be to provide real-time energy to moving vehicles through roads and therefore through tires, but how to do it ? A first part of the answer was provided last year by Toyota’s Central R&D Laboratories and Takashi Ohira of Toyohashi University of Technology (UTU). During a workshop organized in Kyoto, they demonstrated that it was possible to transmitwireless power between two metal plates crossed by chains in opposite directions and specially adapted tires (they are notably belted with parts ofsteel included within the rubber and capacitors). The amount of energy lost in the rubber was also tested on this occasion. It would be, according to the figures of the time, less than 20%.

However, installing steel plates on all our roads can bring many safety and grip issues, especially in case of rain. Thus, improvements were introduced in this project, called Ever for Electric Vehicle on Electrified Roadway (electric vehicle on an electrified road).

A transfer of electricity through concrete

Its evolutions, presented in the magazine Tech-Onwere revealed on July 5 and 6, 2012 during Wireless Technology Park 2012 (WTP), a fair that presents the latest wireless technology. The demonstration speaks for itself. Two full-size tires were placed 10 cm apart concrete (used in Japan in road construction), himself positioned on metal traveled by a current. ONE ampoule was then connected to the two wheels and… began to glow.

Wireless electricity transfer is primarily based on the use of inductive coupling. Conductive elements carrying a current (for example, metal plates equipped with suitable devices) are surrounded by a electromagnetic field. However, this can induce an electromotive force when it cuts a second conductor (such as the steel contained in tires). The researchers’ feat is to have been able to use this property through concrete, ensuring that large amounts of energy can be transferred. An electrical power, that is, the product of the current intensity and the electrical voltage, of 50 to 60 W was actually measured at the lamp terminals. The efficiency of transmitting energy to the tires would again be above 80%, up to 90%, according to Takashi Ohira.

The team will now try to increase the thickness of the concrete through which current can be induced in the tires. These developments are very interesting, but the electricity transmitted by the device would have to be multiplied by 100 before a car could drive on the highways without having to perform stop refills

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