BMW G12 2015 Technical Training Manual page 53

G12￿Voltage￿Supply￿and￿Bus￿Systems
2.￿Control￿Units
The￿preconditions￿for￿the￿direction￿of￿the￿energy￿management￿are￿calculated￿from￿the￿use￿of￿the
vehicle.￿The￿auxiliary￿battery￿is￿charged￿by￿the￿PCU￿when￿the￿engine￿is￿running.￿During￿the￿phases
in￿which￿the￿combustion￿engine￿is￿not￿running,￿e.g.￿automatic￿engine￿start-stop￿function,￿the￿PCU
supplies￿energy￿from￿the￿auxiliary￿battery￿to￿the￿vehicle￿electrical￿system.
2.11.￿Control￿units￿on￿the￿FlexRay
2.11.1.￿Advanced￿Crash￿Safety￿Module￿(ACSM)
Crash￿Safety￿Module￿(ACSM)
The￿function￿of￿the￿Advanced￿Crash￿Safety￿Module￿(ACSM)￿is￿to￿permanently￿evaluate￿all￿sensor
signals￿in￿order￿to￿identify￿a￿crash￿situation.￿The￿ACSM￿evaluates￿the￿information￿from￿the￿sensors
and￿then￿forwards￿corresponding￿measures￿for￿selective￿activation￿of￿the￿necessary￿restraint￿systems.
The￿ACSM￿records￿the￿yaw￿rate￿and￿sends￿this￿information￿on￿the￿FlexRay￿data￿bus.
No￿additional￿yaw￿sensors￿are￿therefore￿required￿for￿the￿other￿systems.
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