BMW F12 2011 Technical Training Manual page 38

F12￿Chassis￿Dynamics
5.￿Steering
5.1.￿Basic￿steering
5.1.1.￿System￿overview
F12￿Electric￿Power￿Steering
Index
1
2
3
4
5
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.
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Explanation
Reduction￿gear
Steering-torque￿sensor
Track￿rod
EPS￿control￿unit
Electric￿motor￿with￿motor￿position￿sensor