Steering: Description and Operation

Dynamic Steering

In conventional steering system, there is a direct mechanical connection between the steering wheel and the steering gear. That means there is a constant, specific relationship between the angle of the steering wheel and the angle of the wheels. In this version, only one ratio can be used in a vehicle. Selecting the appropriate ratio is a compromise because the different and somewhat contradictory requirements must be satisfied as best as possible.

The important requirements can only be fulfilled optimally by a variable ratio. Such a ratio changes the actual steering angle of the wheels depending on the vehicle speed and steering angle. Dynamic steering generally implements two variable ratios with comfortable and sporty characteristics.

The variable ratios are implemented by an additional electro-mechanical steering pinion actuator that superimposes the driver's steering movement. In emergencies such an actuator malfunction, the steering functions exactly like conventional steering. The mechanical connection between the steering wheel and the front axle is not disconnected.

The advantages of dynamic steering are even more extensive. The system is also activated in conjunction with the ESP and its sensors under poor driving conditions. Through selective variation of the front wheel steering angle, the dynamic steering supports the ESP within dynamic driving limits.

The "actuator" located on the steering column is a fixed component of the column. If the "actuator" is faulty, the entire steering column must be replaced.

The "valve" located on the power steering pump is a fixed component of the pump. If the "valve" is faulty, the entire power steering pump must be replaced.

Correct basic setting is required for proper dynamic steering function.

• To make a basic setting successfully, the steering angle sensor (G85) must first be calibrated using the steering wheel balance (VAS 6458).

A basic setting is necessary if:

• The active steering control module (J792) is replaced.

• The front axle toe is adjusted.

• The rear axle toe is adjusted.

• The vehicle suspension was changed, for example, changing from standard to sport suspension.

• The steering angle sensor was calibrated.

• The steering column was replaced.

• The steering wheel is at an angle when driving straight.

• Before performing a basic setting on the dynamic steering, check the event memory and correct any faults. A basic setting to the dynamic steering must only be performed using alignment equipment approved by VW/Audi.