Road magnets attract self-driving Volvo

Road magnets attract self-driving Volvo

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Volvo Car Group has completed a research project using magnets buried within the road surface to help the car determine its position.

The research, which has been financed in co-operation with the Swedish transport administration (Trafikverket), is a potential key to the implementation of self-driving vehicles.

Reliable and accurate positioning is one of the crucial issues in the development of self-driving cars says Volvo.

While established positioning technologies such as GPS and cameras have limitations in certain conditions, road-integrated magnets remain unaffected by physical obstacles and poor weather conditions.

“The magnets create an invisible ‘railway’ that literally paves the way for a positioning inaccuracy of less than one decimetre. We have tested the technology at a variety of speeds and the results so far are promising,” says Volvo car group preventive safety leader Jonas Ekmark.

Volvo is participating in an autonomous driving pilot project where 100 self-driving Volvos will use public roads around the Swedish city of Gothenburg.

“Our aim is for the car to be able to handle the driving all by itself,” says Ekmark. “Accurate positioning is a necessary prerequisite for a self-driving car. It is possible to implement autonomous vehicles without changes to the present infrastructure. However, this technology adds interesting possibilities, such as complementing road markings with magnets.”

According to Volvo road-integrated magnets open up a number of other possibilities:

• Incorporating magnet-based positioning in preventive safety systems could help prevent run-off road accidents.
• Magnets could facilitate accuracy of winter road maintenance, which in turn could prevent damage to snow-covered objects, such as barriers and signs, near the road edge.
• There is also a possibility of more efficient utilisation of road space since accurate positioning could allow lanes to be narrower.

Volvo Cars’ research team created a 100-metre long test track at the company’s testing facilities in Gothenburg. A pattern of round ferrite magnets (40x15mm) was located 200mm below the road surface. The car was equipped with several magnetic field sensors.

The research programme was designed to evaluate crucial issues, such as detection range, reliability, durability, cost and the impact on road maintenance.

“Our experience so far is that ferrite magnets are an efficient, reliable and relatively cheap solution, both when it comes to the infrastructure and on-board sensor technology. The next step is to conduct tests in real-life traffic,” says Ekmark.

“A large-scale implementation of road magnets could very well be part of Sweden’s aim to pioneer technology that contributes to sustainable mobility,” says Swedish transport administration traffic safety director Claes Tingvall.

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