 Dynamic steering
Imagine that the part of the steering column coming from the steering wheel ends in a gear wheel with 102 teeth. These mesh with a hollow wheel, also with 102 teeth, which transmits the steering movement
to the steering gear. So far not very spectacular.
But now we give the gear wheel two fewer teeth with the same tooth pitch. Sure, you will say, then it must become smaller in the diameter and the connection to the hollow wheel is interrupted. But we change
its circular shape to an ellipse so that the teeth still mesh with those of the hollow wheel at two opposite points.
In principle nothing has changed. The steering movement is still transmitted 1 to 1. Now instead of the gear wheel we take a sleeve with still the same amount of 100 teeth. The sleeve itself is round, but is
roller-mounted on an ellipse and deformable on it during its own rotation.
So, the ratio remains 1 to 1 when the sleeve is turned by the steering wheel and continuously deforms on the ellipse. However, if the ellipse is driven by an electric motor at the same time, this results in a gear
ratio of 100 to 102 for each of its revolutions.
If the electric motor and the ellipse make these rotations in the steering direction, this results in a smaller overall transmission ratio of the steering, which is good for parking or city traffic, for example. If both
turn in the opposite direction, the overall gear ratio increases, favorable for fast driving on the highway.
In the event of irregularities or a power failure, not only does the electric motor stop, a spring-loaded lock also snapped (picture above). The steering still works mechanically perfectly. Autonomous driving is
also possible if the electric motor alone takes over the command instead of the steering wheel.
So it's a superimposed steering like the one explained before, only it works differently, it's more compact and has fewer parts. The manufacturer has given it the name 'Dynamic Steering' to emphasize the
possibilities of a steering ratio that can be changed depending on the situation, which makes the vehicle appear more dynamic but can also contribute to active accident prevention.
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