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Tuesday, September 28, 2021

How DTM ran an electrical automobile from a distant location at Purple Bull Ring

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Reigning DTM Trophy Champion Tim Heinemann was efficiently in a position to management the 1200bhp DTM Electrical automobile from AVL Racing’s simulator in Graz, greater than 80km east of the Formulation 1 venue. 

For this function, the championship outfitted the under-development automobile with Schaeffler’s drive-by-wire system, which eradicated the necessity for a bodily connection between the steering column and the transmission. As a substitute electrical impulses have been used to information the wheels because of a direct channel established between the automobile and AVL’s facility within the Styrian capital.

Modifications have been additionally made to the simulator used throughout the run for improved driving dynamics, guaranteeing Heinemann was in a position to get a practical image of the observe forward of him.

“The simulator has a 180-degree display screen with 3 projectors that supplied Tim a full 180-degree view,” Ull Thaler, software program engineer at AVL, informed Autosport’s sister web site Motorsport-Complete.com.

“Likewise, a microphone reproduced the sound instantly from the automobile on our audio system. To ensure that Tim to additionally get a really feel for the tyres, we used a mannequin primarily based on automobile knowledge to simulate the steering torque. It was crucial that the seat place, steering wheel and pedals felt as related as doable to the true automobile.

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“One drawback within the remaining exams earlier than the race was the texture of the brake pedal. It was tough at first for Tim to do the brake appropriately as a result of the pedal felt totally different within the simulator than within the automobile. We measured the braking traits a number of instances and have been in a position to compensate for the variations within the mechanical methods within the software program.”



With the assistance of its companions Schaeffler and Riedel Communications, the DTM employed a mixture of fibre cables and 5G to make sure a steady connection between the simulator and automobile always. Every pedal additionally got here outfitted with two sensors, guaranteeing there was a security internet in case one in every of them developed a fault.

Connecting the automobile to the simulator wasn’t a straightforward job, nevertheless, with Spielberg situated in a mountainous area of Austria.

“We used two separate fibre optic connections between the AVL location in Graz and the road in Spielberg, in addition to a 5G connection,” defined Thaler. “This triple connection was essential for safety causes within the occasion {that a} connection would change into unstable and even fail.”

Daniel Kohl, Head of Technical Growth Motorsport at Schaeffler, added: “What we want is an efficient radio community. After all, that poses sure challenges, firstly, after all, due to the topography [at Spielberg]. After which, after all, we’ve got many different groups. We’ve the onboards of the automobiles, all of the radios, the navy airport. It isn’t with out its issues to have a steady radio community there.”

One of the vital difficult facets of the demo run was decreasing the latency price, or the delay between the driving force hitting the pedals in Graz and the automobile executing the identical command on the Purple Bull Ring.

However the DTM was ready for the worst-possible situation, with an computerized shutdown mechanism put in place in case there was greater than a 0.3s delay in sending indicators from Graz and the Purple Bull Ring. On this case, the automated brakes would have utilized with “most doable deceleration, bringing the automobile to a fast halt.

Explaining the shutdown system, Kohl mentioned: “That is the place I find yourself having to assume, in any state of affairs: if I lose management right here, how a lot time do I’ve earlier than the automobile would hit someplace? How a lot braking distance or deceleration do I’ve within the gravel and on the highway? Then I find yourself in a variety of 0.3 to 0.4 seconds, by which I’ve to change off the automobile.”

The DTM Electrical automobile is ready to make its subsequent public look on the Norisring subsequent month. It was first proven to the world – with out the remote-control capabilities – at Hockenheim final yr, where the DTM revealed plans for a new series based on the prototype for 2023.

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