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Continental Unveils Automated Wireless EV Charging System

Big tech companies are getting more and more serious about wireless EV charging.

Qualcomm recently unveiled a system that can be embedded in road surfaces; now Continental has revealed one of its own system.

At the Continental Tech Show this month and at the Frankfurt Motor Show in September, Continental will be presenting user-friendly inductive charging technology, installed in an electric vehicle. The charging power is transferred wirelessly from a ground-based charging pad to a receiver pad on the underside of the vehicle.

All the driver has to do is to park over the charging pad, assisted by an innovative Continental micro-navigation solution. As soon as the vehicle approaches a parking bay equipped with inductive charging, an authentication dialog with the charging station is executed automatically. A human-machine interface shows the driver when the vehicle has reached the correct parking position and confirms that charging has started.

Continental expert Thomas Röhrl, who is a responsible expert for the inductive charging system, explains: “At present, there can be any of a number of reasons why EV drivers are reluctant to use every available opportunity to recharge their vehicle. If it’s cold outside or wet they may not feel like getting out and grappling with the charging cable.” Particularly when drivers only intend to make a short stop, this may all seem like too much trouble and they will prefer to let the opportunity pass by. Continental offers this charging solution not only for EVs but also for e-bikes.


More practical charging

EV drivers instinctively tend to compare recharging the battery of their electric vehicle to filling up the tank on a conventional vehicle. The two differences that strike them immediately are first of all the fact that charging an electric vehicle takes longer than filling up with fuel and secondly the fact that before charging can start, they have to connect a cable from the charging station to the vehicle. “We have to make recharging more practical and user-friendly,” says Röhrl. “Inductive charging technology will be a big step towards achieving this.”

With this in mind, Continental has developed a comprehensive inductive charging solution capable of recharging the EV at a rate of up to 11 kW.

This system charges the vehicle automatically and complete safely as soon as the vehicle is parked in the correct position over the system’s ground pad. The vehicle-mounted inductive charging components comprise a receiver pad, power electronics, controllers and a human-machine interface to assist with precise parking.

The positioning system too was developed by Continental. The positioning tolerance of better than 10 cm is ideal to ensure the best possible power transfer from the ground pad to the vehicle. Ongoing progress in the field of semi-automated driving technology will in future allow this aspect of the charging process (parking) to be performed without any action on the part of the driver, making for even greater comfort and convenience. At a charging rate of 11 kW, every minute of charging time provides approximately one kilometer of driving range.

“So in the space of a 20 minute shopping trip, the available driving range can be increased by up to 20 km,” says Röhrl.

Inductive charging technology is safe, compact and robust

In addition to convenience, a further feature of this system is its safety. As soon as the wireless authentication process has been successfully completed and the vehicle is correctly parked, the charging pad starts transmitting power. The stepped ramp-up to full output power is completed in just seconds.

If the integrated gap-monitoring function detects the intrusion of a foreign object under the vehicle, between the ground pad and the vehicle pad, power transmission is immediately interrupted. Inductive charging technology takes up relatively little space in a garage or parking lot compared with cable-based technology. The ground pad, which is capable of withstanding a load of up to 500 kg, is either located on or recessed into the ground, making the system easier to integrate in confined parking bays than a wall box. In public parking bays (in parking garages or at shopping malls), a further advantage of inductive charging technology is the greatly reduced risk of vandalism.

Jun 6, 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+.

June 6, 2017 TechnologyContinental, Continental wireless charging, Continental wireless EV charging, Wireless Charging, Wireless EV Charging
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