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R&D

Researchers test autonomous car against racing driver

Ben SampsonBy Ben Sampson5th April 20193 Mins Read
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Shelley, Stanford’s autonomous Audi TTS, performs at Thunderhill Raceway Park. (Image credit: Kurt Hickman)

Researchers from Stanford University in the USA are testing control systems that learn from racing drivers to train autonomous systems. The autonomous cars integrate prior driving experiences to perform more safely in extreme and unknown circumstances. 

The tests, which were conducted at the Thunderhill Raceway in Willows, California, used two autonomous cars developed at Stanford University: Niki, a Volkswagen GTI; and Shelley, an Audi TTS. 

The system was found to perform as well as an existing autonomous control system and an experienced race car driver.

Nathan Spielberg, a graduate student in mechanical engineering at Stanford and lead author of the paper about this research, published last month in the journal Science Robotics, said “Our work is motivated by safety. We want autonomous vehicles to work in many scenarios, from normal driving on high-friction asphalt to fast, low-friction driving in ice and snow. We want our algorithms to be as good as the best skilled drivers – and, hopefully, better.”

While current autonomous cars might rely on in-the-moment evaluations of their environment, the control system these researchers designed incorporates data from recent maneuvers and past driving experiences – including trips Niki took around an icy test track near the Arctic Circle. 

Its ability to learn from the past could prove particularly powerful, given the abundance of autonomous car data researchers are producing in the process of developing these vehicles.

Physics and learning

To develop a more flexible, responsive control system, the researchers built a neural network – a type of artificially intelligent computing system – that integrates data from past driving experiences at Thunderhill and a winter test facility with foundational knowledge provided by 200,000 physics-based trajectories.

“With the techniques available today, you often have to choose between data-driven methods and approaches grounded in fundamental physics,” said J Christian Gerdes, professor of mechanical engineering and senior author of the paper. “We think the path forward is to blend these approaches in order to harness their individual strengths. Physics can provide insight into structuring and validating neural network models that, in turn, can leverage massive amounts of data.”

The group ran comparison tests for their new system at Thunderhill Raceway. First, Shelley sped around controlled by the physics-based autonomous system, pre-loaded with set information about the course and conditions. 

When compared on the same course during 10 consecutive trials, Shelley and a skilled amateur driver generated comparable lap times. Then, the researchers loaded Niki with their new neural network system. The car performed similarly running both the learned and physics-based systems, even though the neural network lacked explicit information about road friction.

In simulated tests, the neural network system outperformed the physics-based system in both high-friction and low-friction scenarios. It did particularly well in scenarios that mixed those two conditions.

An abundance of data

The results were encouraging, but the researchers stress that their neural network system does not perform well in conditions outside the ones it has experienced. They say as autonomous cars generate additional data to train their network, the cars should be able to handle a wider range of conditions.

“With so many self-driving cars on the roads and in development, there is an abundance of data being generated from all kinds of driving scenarios,” Spielberg said. “We wanted to build a neural network because there should be some way to make use of that data. If we can develop vehicles that have seen thousands of times more interactions than we have, we can hopefully make them safer.”

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