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Cubic mathematical steering wheel
First of all, ask Baidu Encyclopedia about the definition of curvature, which is more troublesome in mathematical expressions. I can't type it.

, ? D (trajectory curvature) /dt=C x(dω/dt)=C x D x? Ω (steering wheel) C D remains unchanged.

First of all, because the steering wheel angle is the largest, the car will eventually move in a uniform circle. Before this, the object will have an inner spiral that increases evenly with the curvature time, and then it will become round when the curvature reaches a certain limit.