BMW F12 2011, Technical Training Manual, Page: 38 / 68

F12�Chassis�Dynamics
5.�Steering
34
5.1.�Basic�steering
5.1.1.�System�overview
F12�Electric�Power�Steering
Index Explanation
1 Reduction�gear
2 Steering-torque�sensor
3 Track�rod
4 EPS�control�unit
5 Electric�motor�with�motor�position�sensor
EPS�steering�reduces�fuel�consumption�by�roughly�0.3l�per�100�km�when�compared�to�conventional
hydraulic�power�steering.�This�helps�reduce�carbon�dioxide�emissions.
As�there�is�no�oil�in�an�EPS,�it�is�environmentally�cleaner�than�conventional�hydraulic�power�steering.
For�reasons�inherent�in�the�system,�EPS�is�always�equipped�with�the�Servotronic�function.�Two�differ-
ent�settings�(“Normal”�and�“Sporty”)�can�be�accessed�via�the�driving�dynamic�control�switch.
The�EPS�is�less�sensitive�to�external�disturbance�variables�such�as�shudder�and�steering�wheel�vibra-
tion.�It�also�features�active�roll�damping�which�enhances�the�driving�safety�of�the�F12.
The�return�characteristics�of�the�EPS�are�fully�configurable.�That�means�that�optimum�drivability�can
be�guaranteed.�In�addition,�the�EPS�allows�implementation�of�the�parking�assistance�feature.