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feedback needed

Mercedes’ patented steering may finally make EVs exciting to drive

It describes a way of generating feedback for the driver through the steering.

Jonathan M. Gitlin | 199
A photo of a Mercedes-Benz EQS interior
Credit: Mercedes-Benz
Credit: Mercedes-Benz
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New cars really are better than they used to be. They last longer, they're more efficient, and they're safer for the occupants in a crash. But it's not entirely a one-way street. If the last time you bought a car was more than a decade ago, you're probably shocked at the cumulative effect of inflation since then. But even ignoring sticker shock, there's also the matter of cars (almost) all having lifeless steering. But a patent filed last year by Mercedes-Benz might have the answer.

Regular readers will have read me complain about the death of steering feedback more than once. And that's a bad thing if you care about driving, or even if you don't. The late Richard Parry-Jones, an engineer whose career at Ford saw him rise to become CTO and head of global R&D, tracked customer satisfaction data and was able to prove to skeptical colleagues that good steering was highly correlated with customer satisfaction "because bad steering is tiring," he wrote.

Mostly, it's down to a switch from hydraulic to electric power-assisted steering—in many cases, the electric motor is placed on the steering column, which has the side effect of filtering out road forces, keeping them from being transferred back up the column and to the driver's hands via the steering wheel.

Other, more expensive electric power steering systems mount the assist motor on the steering rack, which somewhat mitigates the problem, and being thoughtful about suspension geometry—as the Polestar 4 is—can also pay benefits.

The invention, discovered by CarMoses, a site that researches automotive patents and trademarks, is a bit more forward-looking, however. Instead of adding back feedback to mechanical steering, it is focused on steer-by-wire, where there is no physical column between the steering wheel and front wheels.

While steer-by-wire is technically possible, its use has been extremely limited by automakers. Infiniti sold the Q60 with steer-by-wire (with a column for backup), and while I didn't hate the steering experience, I'm in a pretty small minority there. More recently, Tesla went with steer-by-wire for the Cybertruck, a system that has resulted in a litany of complaints and more than a few people being stranded on the side of the road after it failed.

What’s the patent say?

Mercedes' patent is for a system that can determine how much torque to send to the steering wheel in response to what the front wheels are experiencing. Essentially, it observes how much torque is acting on the wheels from the road (not from the powertrain), then uses a model based on real steering systems to calculate how much torque to deliver to the driver as feedback.

The advantage of this versus an earlier idea of providing feedback—using elastic return units—is that it doesn't require additional components. The sensor that determines the steering rack position, as well as the electric motor, is already part of a steer-by-wire setup.

Photo of Jonathan M. Gitlin
Jonathan M. Gitlin Automotive Editor
Jonathan is the Automotive Editor at Ars Technica. He has a BSc and PhD in Pharmacology. In 2014 he decided to indulge his lifelong passion for the car by leaving the National Human Genome Research Institute and launching Ars Technica's automotive coverage. He lives in Washington, DC.
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