Quote:
Originally Posted by Sarlacc
Anyone got any input on how electric power steering works in general, and on our cars in particular?
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If you're sitting still with the engine off it's possible to turn the steering wheel a few degrees either direction and feel a light springy resistance.
The steering wheel is not coupled to the shaft in this arc. This is only the error input. Think of it like a gaming joystick. Turn a bit to the right. It commands the servo to turn the shaft to the right until the shaft and steering wheel are back in alignment.
Now for the hard part. The failure modes would be determined by how the reduction gear is coupled to the shaft and specific choices made in the design of the controller itself. I would have to see schematics and all the related code (because no one designs purely analog systems anymore) to decipher it any further.