BMW F12 2011 Technical Training Manual page 54

F12￿Chassis￿Dynamics
5.￿Steering
5.2.4.￿Rear￿axle￿slip￿angle￿control￿HSR
F12￿Installation￿location￿of￿HSR￿actuator￿at￿integral￿V￿rear￿axle
Index
1
2
3
4
5
The￿use￿of￿Integral￿Active￿Steering￿increases￿the￿overall￿ride￿comfort￿and￿dynamics￿of￿the￿vehicle￿by
actively￿steering￿the￿rear￿wheels￿in￿certain￿conditions.
The￿special￿HSR￿actuator￿on￿the￿rear￿axle￿is￿fastened￿underneath￿a￿support￿plate￿on￿the￿rear￿axle￿sup-
port.￿This￿electromechanical￿actuator￿is￿located￿between￿the￿two￿camber￿links￿of￿the￿integral￿V￿rear
axle.￿The￿rear￿wheel￿steering￿system￿includes￿a￿dedicated￿HSR￿control￿unit￿that￿controls￿and￿monitors
the￿HSR￿actuator.
Control￿systems￿were￿designed￿independently￿of￿one￿another￿using￿the￿state-of-the-art￿technology.
In￿the￿F12￿these￿systems￿are￿networked￿by￿the￿ICM.￿In￿the￿ICM￿architecture￿a￿central￿control￿unit￿has
superseded￿the￿driving￿dynamics￿sensors￿previously￿used￿and￿constitutes￿a￿central￿driving￿dynamics
controller.
50
Explanation
Mounting￿plate
Left￿camber￿link
HSR￿actuator
Right￿camber￿link
HSR￿control￿unit