BMW 7 Series: System Overview

Integrated Active Steering

General Details

Integrated Active Steering is an innovative and logical development of the Active Steering system developed by BMW.

With Active Steering, a steering angle amplification factor reduces the steering effort on the part of the driver and combines the capabilities of "steer by wire" systems with authentic steering feedback.

By intervening in the steering independently of the driver's actions, it is also able to perform a stabilizing function in terms of vehicle handling.

In order to move further ahead in terms of handling dynamics, the familiar Active Steering has now been logically extended by the addition of active rear-wheel steering on the new BMW 7 Series.

Active Steering of the rear wheels is a logical extension of Active Steering and the two are now combined as an all-in one system referred to as Integrated Active Steering.

Integrated Active Steering is available as an option on the F01/F02 because the standard steering system is the Servotronic.

Components of Servotronic Steering (standard)

Fig. 80: Identifying Servotronic Steering Components (Standard)

SERVOTRONIC STEERING (STANDARD) COMPONENT REFERENCE CHART

1. DME
2. Front power distribution box
3. SZL
4. ICM
5. ZGM
6. DSC
7. Servotronic valve
8. Electronic volumetric flow control (EVV) valve

Components of Integrated Active Steering

Fig. 81: Identifying Integrated Active Steering Components

INTEGRATED ACTIVE STEERING COMPONENT REFERENCE CHART

1. DME
2. Front power distribution box
3. CAS
4. Brake light switch
5. Instrument cluster
6. Integrated Chassis Management (ICM)
7. Rear power distribution box
8. HSR control unit
9. Rear-wheel steering actuator (HSR)
10. SZL
11. ZGM
12. Active Steering actuator control unit
13. DSC
14. Active Steering actuator motor with motor angular position sensor and lock
15. Electronic volumetric flow control (EVV) valve
16. Servotronic valve

Bus Diagram for Lateral Dynamics Systems

Fig. 82: Bus Diagram For Lateral Dynamics Systems

INDEX REFERENCE CHART

CAS - Car Access System
ZGM - Central Gateway Module
DME - Digital Motor Electronics
DSC - Dynamic stability control
SZL - Steering column switch cluster
HSR - Rear-wheel steering control unit
AL - Active Steering
ICM - Integrated Chassis Management

System Circuit Diagram for Servotronic System

Fig. 83: Servotronic System Circuit Diagram

INDEX REFERENCE CHART

1. Dynamic stability control
2. Electronic volumetric flow control (EVV) valve
3. Servotronic valve
4. Digital Motor Electronics
5. Central Gateway Module
6. Steering column switch cluster
7. Front power distribution box
8. Integrated Chassis Management

System Circuit Diagram for Integrated Active Steering

Fig. 84: Integrated Active Steering System Circuit Diagram

INDEX REFERENCE CHART

1. Active Steering lock
2. Active Steering electric motor
3. Active Steering motor angular position sensor
4. Electronic volumetric flow control (EVV) valve
5. Servotronic valve
6. Dynamic stability control
7. Digital Motor Electronics
8. Central Gateway Module
9. Active Steering
10. Car Access System
11. Front power distribution box
12. Instrument cluster
13. Steering column switch cluster
14. Brake light switch
15. Integrated Chassis Management
16. Right rear power distribution box
17. Battery power distribution box
18. Rear suspension slip angle control
19. HSR electric motor
20. Hall-effect sensor
21. Track-rod position sensor

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