BMW I01 Product Information page 36

I01￿High-voltage￿Components
3.￿Electric￿Motor
• Transmission￿gearing￿with￿two￿spur￿gear￿units￿(central￿transmission)
• Differential￿integrated￿in￿the￿transmission￿housing
• Electromechanically￿operated￿parking￿lock.
As￿the￿electrical￿machine￿offers￿a￿large￿usable￿engine￿speed￿range,￿the￿transmission￿of￿the￿I01￿also
only￿has￿to￿provide￿one￿gear,￿i.e.￿a￿fixed￿gear￿ratio.￿A￿combustion￿engine￿cannot￿deliver￿torque￿when
the￿engine￿speed￿is￿zero.￿Unlike￿the￿electrical￿machine￿of￿the￿I01:￿Its￿high￿torque￿is￿already￿available
when￿the￿engine￿speed￿is￿zero￿meaning￿a￿clutch￿in￿the￿transmission￿of￿the￿I01￿is￿not￿required￿–￿not￿for
driving￿off￿or￿for￿shifting￿gears.
Gear￿selector￿switch￿I01
The￿transmission￿in￿the￿I01￿is￿operated￿using￿a￿mono-stable￿rotary￿gear￿selector￿switch.￿The￿gear
selector￿switch￿offers￿the￿option￿of￿selecting￿the￿familiar￿drive￿positions￿"P",￿"N",￿"R",￿"D".￿The￿drive
positions￿are￿shown￿as￿a￿shift￿pattern￿with￿auxiliary￿lines.￿The￿current￿drive￿position￿is￿highlighted.
The￿following￿table￿shows￿how￿the￿individual￿drive￿positions￿are￿realized.
Drive Status￿of￿parking￿lock
position
Parking￿P Engaged
Neutral￿N Disengaged
Reverse￿R Disengaged
Drive￿D Disengaged
Two￿control￿units￿are￿responsible￿for￿engaging￿and￿disengaging￿the￿parking￿lock.
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Activation￿of￿the￿electrical￿machine
De-energized
De-energized
Engine/Alternator￿with￿direction￿of￿rotation￿for
reversing
Engine/Alternator￿with￿direction￿of￿rotation￿for
forwards￿travel