October 6, 2022

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Mars wheel control algorithms gain momentum

Mars wheel control algorithms gain momentum

Picture the scene: You’re driving around in your car when, at least an hour from nearest help, one of your tires starts losing air. do not worry! You have a spare tire with the tools and knowledge to change it. And if that fails, you can call for roadside assistance. But what if your car is not a car, has alloy wheels for which no spare parts are available, and the nearest help is 200 million miles away? You may be the JPL engineer on the Curiosity Mars Rover mission, which in 2017 was tasked with creating New driving algorithm designed to extend wheel life.

High performance rock crawler, courtesy Spidertrax.com license: CC BY 3.0

You could argue that the Curiosity Mars is the perfect off-road vehicle, and as such it has to handle conditions no different in some ways from some locations here on Earth. Ground-restricted rock crawlers use long travel suspensions, specialized drivetrains, and a locking differential to keep tires on the ground and prevent loss of traction.

On Mars, the landscape is dominated by sand and rocks, and the rover must navigate around the worst of it. It’s inevitable, just like any terrestrial off-road vehicle, that Mars rovers will spin a tire now and then when they lose traction. The Mars rover also has a specialized propulsion system and long-distance suspension system. However, they do not use differentials, so how can they prevent the loss of traction and the consequent wheel spin damage? This is where the traction control algorithm mentioned above comes in.

By controlling wheel spin with less traction, they can still contribute to vehicle movement while avoiding rocky rash. Make sure to check out Excellent article on JPL For a full explanation of their methodology and the added benefits of downloading new algorithms to control traction from a distance of 200 million miles! There is no doubt that the persistent rover on Mars has also benefited from this research.

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But why should NASA have all the fun? You can join them by 3D printing of your own Mars rover And maybe some Power wheels derive traction control. What a pleasure!