Steer-by-wire could enable playing onboard video games, while the new yoke has more advantages than expected.
with the traditional components, I hopped into the RZ with the yoke and steer-by-wire system. Three turns into my first lap and I thought I might be going nuts. Perhaps it was the European food, lack of sleep, or all the coffee that was keeping me awake, but I felt the tires start to reach their limit of adhesion through the steering wheel. What magic is this?
Tesla’s yoke is a terrible, horrible, no good idea because its traditional electric power steering lacks variable ratios, and thus drivers have to steer hand over hand without a top or bottom of the steering wheel to grab. Unlike Tesla’s system, Lexus’ steer-by-wire has no mechanical connection to the wheels, the steering ratio is infinitely variable, and the yoke only requires 150 degrees of rotation lock-to-lock.
According to Lexus Chief Engineer Takashi Wantanabe, the system monitors the force on the steering rack based on the torque input from the tires. It does this by measuring lateral and yaw gains. From there, it determines the amount of force feedback that should be sent back to the steering wheel via a torque motor.
After asking Wantanabe to explain how the system worked, I realized it wasn’t sleep deprivation or the coffee. The steering feel was, seemingly, replicated, to a shocking degree of authenticity on an admittedly smooth and well-kept race track, thanks to the ingenious design.However, at slower speeds like in a parking, the system is a mixed bag as it stands right now.
The calibration of the system I tested wasn’t finished. With moderate to heavy throttle at full lock in a corner at parking lot speeds, the yoke would twitch as if signals were getting mixed up and the system wasn’t sure what to do. It was repeatable. Lexus Steer-By-Wire Engineer Masayoshi Kobayashi toldthis was a known issue and the software’s still being tweaked. Admittedly, this particular situation was an extreme example that isn’t likely to pop up except during an emergency maneuver.
In the near term, Wantanabe floated the idea of drivers using the yoke to play “Gran Turismo” on the infotainment screen when waiting at a charging station. The steer-by-wire system could be electronically connected to the game. The programming could even be matched to the player’s vehicle of choice in the game, and could provide feedback to match the game’s track variables. Lexus hasn’t developed that capability yet, but it could in the future.
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