BMW leverages real-world Formula E experience for its sim-racers

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Though real-life motorsport saw a return in the second half of 2020 following its pandemic-enforced hiatus, the momentum virtual racing series achieved has continued into 2021. Manufacturers have taken notice and most now have their own e-racing teams, some even providing engineering support to competitors.

In the case of the virtual 2021 Formula E racing season, Formula E: Accelerate, racers will now have to handle features such as energy management and ‘attack mode’ – which have been incorporated into the rFactor 2 platform – just as they would in a physical FE race.

To help their drivers master this challenge, BMW Motorsport SIM Racing teams Redline and GB are receiving support from BMW Motorsport performance engineers, who are sharing their experience gained in real Formula E.

Redline driver Kevin Siggy is a highly accomplished racer on the rFactor 2 platform. In 2020, he took overall victory in the inaugural virtual Formula E competition, the ‘ABB Formula E Race at Home Challenge’. Despite his experience, he was surprised when he first sampled the 2021 BMW iFE.21 model.

“Energy management is not totally new to me, because we basically don’t do anything differently when it comes to saving fuel during endurance races. But I had no idea that you have to save so much energy in Formula E in order to cover the full distance,” said Siggy. “In the first tests, I thought the game had an error, because I was so far off the energy level I needed to achieve. I had expected to have to coast for perhaps 50m – but not 200. It took me quite a while to find out how to do a lap, on which I was quick but also managed to save sufficient energy.”

Support to get the racers up to speed on energy management strategy is being provided by BMW Motorsport engineers Jannis Hellwig and Benedikt Schaich, both of whom were deeply involved in development of the (real) iFE.21.

“It is exciting for us to see how much of what we have learned over the years in Formula E we can transfer to a different platform, like sim racing,” said Schaich.

“In reality, the physics behind energy management is very complicated. This is obviously simplified in the simulation, not only on rFactor 2, but we are also familiar with this from our own simulation tools. Our models for the BMW iFE.21 cannot be transferred 1:1 to the simulation,” Hellwig added.

In a real Formula E car, energy management is subject to various basic rules. One of the most important of these is to use energy at low speeds and save energy at high speed. As a result, energy management primarily takes place on straights – and in four stages: full acceleration out of corners, coast at top speed, maximum regeneration on the rear axle ahead of the next corner and brake into the corner on the front axle. In reality, this process can be adapted and optimized very flexibly. The simulation is less flexible.

“With this in mind, after consulting the BMW Motorsport engineers, I had to find a way to take their information and adapt it so that it would work for me in the simulation,” Siggy explained. “For example, on my steering wheel I am unable to change the various levels of regeneration as quickly as Formula E drivers in the real car, so had to simplify the process a little to achieve the necessary energy level.”

For GB driver Petar Brljak, having to deal with limited energy during a race requires considerable forward planning: “You are actually thinking about energy management before the race even starts. Should you use a lot of energy at the start to gain places, or save it for later? I think we have several approaches; you can stick to your plan at all times and, in theory, set the fastest race pace, you can save energy at the start to ensure you have reserves for the final few laps, or you can switch between saving and consuming throughout the race. It depends on the race situation.”

Correctly evaluating these race situations and then planning the use of attack mode, which provides an energy boost but can also cost the driver time and possibly track position to activate, is a question of experience. As such, the role of the BMW Motorsport engineers is primarily to advise the sim racers and their teams, thus accelerating the learning process.

This is not so different from the challenges facing BMW’s factory drivers. “The likes of Maximilian Günther also started from scratch when it comes to energy management, and also had to learn it all. Jake Dennis is a new driver on the Formula E scene, so he is still in the middle of this process,” noted Hellwig.

“As such, they are not that different to the sim racers. The top drivers at BMW i Andretti Motorsport have also had to completely adapt their driving style for Formula E. Experience is hugely important in this regard.”

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Lawrence has been covering engineering subjects – with a focus on motorsport technology – since 2007 and has edited and contributed to a variety of international titles. Currently, he is responsible for content across UKI Media & Events' portfolio of websites while also writing for the company's print titles.

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