BMW I01, Информация о продукте

Страница: 148 / 190

I01�High-voltage�Components
9.�Range�Extender�Electrical�Machine
142
9.1.�Introduction
The�high-voltage�components�examined�up�to�now�pave�the�way�for�a�pure�electric�driving�of�the
I01.�The�electrical�machine�receives�the�energy�required�for�the�electric�motor�from�the�high-voltage
battery.�The�EME�converts�the�direct�current�voltage�from�the�high-voltage�battery�into�3-phase�AC
voltage.
The�I01�with�a�pure�electric�driving�is�designed�so�that�a�distance�of�about�150 km�/�93�mi�(115�mi
using�efficiency�mode)�can�be�covered�before�the�high-voltage�battery�must�be�charged�up�again.�The
high-voltage�battery�can�also�be�charged�at�an�earlier�stage.
A�I01�which�is�equipped�with�a�range�extender�can�cover�a�distance�of�about�300 km�/�186�mi�(200
mi�using�efficiency�mode)�before�the�high-voltage�battery�has�to�be�charged�or�the�tank�has�to�be
refuelled.�This�means�a�I01�with�range�extender�offers�double�the�range�in�comparison�to�a�I01�with�a
purely�electric�motor.
Also�in�the�I01�with�range�extender�the�electric�motor�with�energy�from�the�high-voltage�battery�is�used
as�a�primary�drive�type.�The�range�extender�system�is�only�activated�when�the�state�of�charge�of�the
high-voltage�battery�falls�below�a�certain�value.
The�range�extender�system�consists�of�the�following�components:
• W20�Combustion�engine
• Range�extender�electrical�machine
• Range�Extender�Electrical�Machine�Electronics
• Range�Extender�Digital�Engine�Electronics.
The�W20�combustion�engine�is�a�2-cylinder�engine.�It�is�a�small,�very�smooth-running�and�quiet
gasoline�engine,�which�is�connected�mechanically�to�the�range�extender�electrical�machine�via�a
geared�shaft.�At�a�low�state�of�charge�of�the�high-voltage�battery�the�W20�engine�is�started�using�the
range�extender�electrical�machine.�In�this�case�the�range�extender�electrical�machine�works�in�engine
mode.�The�electrical�energy�for�starting�the�W20�engine�comes�from�the�high-voltage�battery.�As�soon
as�the�W20�has�been�started,�the�range�extender�electrical�machine�changes�from�engine�to�alternator
mode�and�generates�electrical�energy�which�is�used�for�the�electric�motor�of�the�vehicle�via�the�(main)
electrical�machine.�The�W20�engine�is�not�connected�mechanically�to�the�sprockets.�The�mechanical
energy�of�the�W20�engine�is�converted�by�the�range�extender�electrical�machine�solely�into�electrical
energy.�The�(main)�electrical�machine�uses�this�electrical�energy�and�converts�it�to�mechanical�energy
to�drive�the�rear�wheels.�The�layout�of�these�components�corresponds�to�a�serial�hybrid�car.
In�this�chapter�the�range�extender�electrical�machine�is�described�and�in�the�next�chapter�details�are
provided�on�the�range�extender�electrical�machine�electronics.
The�W20�engine�and�the�engine�control�of�the�range�extender�digital�engine�electronics�are�described
in�the�product�information�bulletin�"W20�Engine".
9.2.�Technical�data
The�performance�data�of�the�range�extender�electrical�machine�is�summarized�in�the�following�table: