Components of Integrated Active Steering
| Index | Explanation |
|---|---|
| 1 | Hydraulic fluid reservoir |
| 2 | Power steering cooler |
| 3 | DME |
| 4 | ZGM |
| 5 | CAS |
| 6 | Instrument cluster |
| 7 | DSC |
| 8 | AL |
| 9 | SZL |
| 10 | ICM |
| 11 | Hydraulic pump |
| 12 | Electronic volumetric flow control (EVV) valve |
| 13 | Lock |
| 14 | Servotronic valve |
| 15 | Actuator unit electric motor |
| 16 | Motor angular position sensor |
| Index | Explanation |
|---|---|
| 1 | Mounting plate |
| 2 | Left track rod |
| 3 | HSR actuator |
| 4 | Right track rod |
| 5 | HSR control unit |
The special actuator on the rear suspension is fixed underneath a mounting plate on the rear suspension subframe.
The electromechanical actuator is positioned between the two new track rods of the Integral V rear suspension. The rear-wheel steering system has its own actuator control unit which is responsible for controlling and monitoring the actuator.
It was previously the state of the art that control systems were largely independent of one another.
On the F01/F02, the Integrated Chassis Management (ICM) system brings the separate systems together.
A central ICM control unit in the ICM architecture replaces the previous dynamic handling sensors and forms a central dynamic handling controller.
| Index | Explanation |
|---|---|
| 1 | Left track rod joint |
| 2 | Left shaft gaiter |
| 3 | Worm shaft |
| 4 | Worm nut |
| 5 | Electric motor |
| 6 | Electrical connector |
| 7 | Right shaft gaiter |
| 8 | Right track rod joint |
| 9 | Iron jacket |
| 10 | Winding stator |
| 11 | Permanent magnet |
| 12 | Carrier/armature winding iron core |
The electromechanical actuator essentially consists of an electric motor which moves the two track rods by means of a worm-and-nut steering gear.
The actuator is designed for a maximum travel of ±8 mm, which brings about a maximum steering angle of ±3° at the roadwheel.
The worm-and-nut rear-wheel steering gear is self-inhibiting. That means that if the system fails, the vehicle adopts exactly the same handling characteristics as a vehicle without rear-wheel steering.
| Index | Explanation |
|---|---|
| 1 | Wheel speed sensors |
| 2 | DSC |
| 3 | SZL with steering-angle sensor |
| 4 | Active Steering control unit |
| 5 | AS actuating unit |
| 6 | HSR control unit |
| 7 | HSR actuator unit |
| 8 | ICM |
| 9 | DSC sensor in ICM (linear acceleration, lateral acceleration and yaw rate sensor) |
| 10 | Back-up DSC sensor in ICM (lateral acceleration and yaw rate sensor) |