Progressive Steering: Function

The progressive steering is different than standard electromechanical steering systems because of the variable teeth on the steering rack, the pinion and its more powerful electric motor. When compared to a constant steering ratio, the teeth on the steering rack are changed significantly by the amount of steering travel. The helical gearing causes the ratio of the steering pinion to the steering rack to change. The steering rack covers a greater distance although the steering angle is the same.

Steering Rack Comparison

When driving straight ahead, the steering pinion is located on the straight teeth of the steering rack (green area).

When the steering angle is larger, the steering pinion meshes with the helical teeth of the steering rack (blue area).