BMW F97 Technical Training Manual page 41

F97/F98￿Complete￿Vehicle
4.￿Powertrain
Index
1
2
3
4
5
6
Interfaces
The￿M￿GHAS￿control￿unit￿works￿with￿the￿following￿control￿units￿and￿includes￿the￿following￿information:
Control Bus￿system
unit
BDC FlexRay
DME FlexRay
M￿DSC FlexRay
ACSM FlexRay
Electric￿motor￿location￿determination
To￿determine￿the￿position￿of￿the￿electric￿motor,￿2￿hall￿effect￿sensors￿in￿the￿engine￿are￿evaluated.
To￿calculate￿the￿characteristic￿curve￿for￿lock-up￿torque￿over￿motor￿position,￿recalibration￿is￿performed
at￿regular￿intervals￿to￿compensate￿for￿wear￿in￿the￿clutch.
To￿be￿able￿to￿assign￿a￿certain￿position￿of￿the￿servomotor￿a￿certain￿coupling￿lock-up￿torque￿and￿to￿take
the￿wear￿influences￿into￿account￿while￿doing￿so,￿a￿reference￿run￿is￿performed￿after￿the￿vehicle￿engine
is￿switched￿off.￿During￿this￿reference￿run￿the￿engine￿is￿subjected￿to￿a￿defined￿current￿level.￿The￿lock-
up￿torque￿of￿0 Nm￿is￿assigned￿to￿the￿resulting￿position.
Explanation
M￿Dynamic￿Stability￿Control￿(M￿DSC)
Body￿Domain￿Controller￿(BDC)
Advanced￿Crash￿Safety￿Module￿(ACSM)
Components￿of￿the￿regulated￿M￿rear￿axle￿differential￿lock
Regulated￿M￿rear￿axle￿differential￿lock￿(M￿GHAS)
Power￿distribution￿box,￿rear
Information
-￿Terminal￿status
-￿Vehicle￿identification￿number￿(for￿encoding)
-￿Vehicle￿condition￿(power￿management￿and￿fault￿memory￿block,
e.g.￿in￿the￿event￿of￿voltage￿drop￿by￿engine￿start)
-￿"Engine￿running"￿signal
-￿Wheel￿speed
-￿Setpoint￿axial￿torque￿distribution
-￿Stabilization￿status
-￿Brake￿value
-￿Tolerance￿adjustment￿of￿wheel￿(adjustment￿of￿different
wheel￿circumferences)
-￿Driving￿speed
-￿Lateral￿acceleration
-￿Yaw￿rate
-￿Road￿longitudinal￿tilt
-￿Steering￿angle
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