I01�High-voltage�Components
11.�Cooling�the�Electrical�Machine
Components
169
Index
Explanation
6
Signal,�temperature�in�the�electrical�machine
7
Temperature�sensor�in�the�convenience�charging�electronics
8
Signal,�temperature�in�the�convenience�charging�electronics
9
Dynamic�Stability�Control
10
Vehicle�speed
11
Temperature�sensor�of�the�range�extender�electrical�machine
12
Signal,�temperature�in�the�range�extender�electrical�machine
13
Electrical�Digital�Motor�Electronics
14
Temperature�sensor�in�the�range�extender�electrical�machine�electronics
15
Signal,�temperature�in�the�range�extender�electrical�machine�electronics
16
Electric�coolant�pump
17
Power�requirement�at�electric�coolant�pump
18
Electric�fan
19
Speed�requirement,�electric�fan
Similar�to�the�cooling�systems�of�current�BMW�vehicles�with�combustion�engines,�the�control�in�the
I01�is�also�effected�depending�on�the�cooling�power�requirement.�This�control�is�integrated�in�the
Electrical�Digital�Motor�Electronics�(EDME).
The�following�input�signals�are�used�for�the�control:
•
Component�temperature�of�electrical�machine
•
Component�temperature�of�electrical�machine�electronics
•
Component�temperature�of�convenience�charging�electronics
•
Component�temperature�of�range�extender�electrical�machine�electronics
•
Component�temperature�of�range�extender�electrical�machine
•
Current�power�used�in�the�electric�motor�or�convenience�charging�electronics
•
Driving�speed.
In�comparison�to�the�familiar�cooling�systems�of�conventional�vehicles,�the�coolant�temperature�is�
not
used�as�an�input�variable�for�the�control.�Accordingly,�there�is�no�coolant�temperature�sensor�in�the
cooling�system�for�the�electric�motor�of�the�I01.�Instead,�the�electric�coolant�pump�and�the�electric
fan�are�activated�according�to�the�listed�input�variables�and�also�the�current�cooling�requirement.�The
coolant�can�reach�a�maximum�temperature�of�about�85 °C/�185 °F�(return�from�the�electrical�machine).
In�comparison�to�the�cooling�system�for�BMW�combustion�engines,�the�temperature�level�is�lower.�The
cooling�circuit�for�the�range�extender�has�a�higher�temperature.�Therefore,�using�the�coolant-coolant
heat�exchanger�the�temperature�of�the�coolant�in�the�cooling�circuit�for�the�range�extender�can�be
reduced.�Also�in�the�I01�the�familiar�precautionary�measures�must�be�observed�before�working�on�the
cooling�system.
The�activation�of�the�coolant�pump�and�electric�fan�can�be�effected�in�the�following�vehicle�conditions:
