BMW I01 Product Information page 53

I01￿High-voltage￿Components
3.￿Electric￿Motor
Index
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The￿upper￿graphic￿shows￿that￿the￿EDME￿control￿unit￿acts￿as￿a￿master￿and￿coordinator￿for￿the￿primary
functions￿of￿the￿drive￿control.
Before￿a￿drive￿torque￿is￿applied,￿the￿EDME￿must￿check￿whether￿the￿driving￿readiness￿is￿established.
The￿EDME￿also￿queries￿whether￿all￿subsystems￿of￿the￿electrical￿drive￿train￿are￿functioning￿trouble-
free,￿which￿is￿also￿a￿prerequisite￿for￿the￿provision￿of￿a￿drive￿torque.￿Finally,￿the￿EDME￿still￿has￿to
consider￿the￿available￿electrical￿power￿for￿the￿electric￿motor￿which￿is￿primarily￿determined￿by￿the
condition￿of￿the￿high-voltage￿battery.￿The￿SME￿control￿unit￿communicates￿this￿condition￿to￿the￿EDME
control￿unit￿via￿corresponding￿bus￿signals.￿As￿a￿result￿of￿these￿checks￿the￿EDME￿identifies￿whether
and￿in￿what￿scope￿the￿drive￿torque￿can￿be￿provided.￿In￿the￿case￿of￿fault￿statuses￿or￿in￿the￿event￿of
limited￿availability,￿the￿EDME￿issues￿an￿appropriate￿Check￿Control￿message￿via￿the￿instrument￿cluster.
The￿functions￿described￿here￿can￿be￿summarized￿under￿the￿term￿"Operating￿strategy".
An￿important￿input￿signal￿for￿the￿determination￿of￿the￿drive￿torque￿is￿the￿accelerator￿pedal￿angle,￿which
is￿transmitted￿via￿direct￿wiring￿from￿the￿accelerator￿pedal￿module￿to￿the￿EDME.￿Using￿this￿signal￿the
EDME￿determines￿the￿torque￿request￿of￿the￿driver.￿The￿EDME￿must￿compare￿and￿coordinate￿this
torque￿request￿and￿any￿other￿torque￿requests￿made￿at￿the￿same￿time,￿for￿example￿from￿the￿cruise
control￿or￿the￿DSC.￿Using￿this￿input￿information￿the￿EDME￿can￿calculate￿the￿actual￿drive￿torque
required￿of￿the￿electrical￿machine.
Explanation
Accelerator￿pedal￿module
Signal,￿accelerator￿pedal￿angle
Electronic￿gear￿selector￿switch￿(GWS)
Operating￿signals￿of￿the￿electronic￿gear￿selector￿switch
Battery￿management￿electronics￿(SME)
Signals￿about￿the￿state￿of￿charge￿and￿the￿available￿electric￿power￿of￿the￿high-
voltage￿battery
Dynamic￿Stability￿Control￿(DSC)
Signals￿about￿the￿dynamic￿handling￿characteristics,￿e.g.￿the￿driving￿speed
Electrical￿Digital￿Motor￿Electronics￿(EDME)
Electrical￿machine
Phase￿voltages￿for￿the￿coils￿of￿the￿electrical￿machine
Electrical￿machine￿electronics￿(EME)
Requested￿drive￿torque￿(engine/alternator)
Electric￿coolant￿pump
Power￿requirement￿at￿electric￿coolant￿pump
Electric￿fan
Power￿requirement￿at￿electric￿coolant￿pump
Instrument￿cluster
Display￿information￿on￿the￿condition￿of￿the￿electric￿motor￿and￿Check￿Control
messages￿in￿the￿event￿of￿a￿fault
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