Tank system:
Now fill tank

Tank system:
is being vented.
Please wait

P

+95 °F

P

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+95 °F

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17

Power transmission
Overview
Power transmission is provided by the front wheel drive,
six-speed S tronic (DSG) transmission.
The integrated Electro-drive Drive Motor (e-machine) is a
permanently excited synchronous machine that develops
up to 102 hp (75 kW) of power. It is capable of delivering
approximately 243 lb ft (330 Nm) of torque to the transmission. The e-machine provides electric-only drive-away
from standstill and electric-only driving as well as starting
the internal combustion engine via clutch K0.

In generator mode, the e-engine is driven by the internal
combustion engine using the vehicle’s propulsion energy
(recuperation) or through the closed K0 clutch. The electric
drive motor supplies power to the entire vehicle.

If necessary, in Boost mode, the e-machine and internal
combustion engine are connected via clutch K0 and deliver
the maximum system power to the transmission.

2-pin connector for
safety line

10-pin connector for:
2 contacts for Drive Motor Temperature Sensor,
6 contacts for Drive Motor Rotor Position Sensor 1 and
2 contacts for the safety line

Parking lock lever

Oil gauge pipe

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ATF drain plug 1 (manual transmission)
18

ATF inspection bolt

Electro-mechanical brake servo
Because intake manifold vacuum isn’t available when
driving in electric only mode, a new brake booster system
was developed. The use of the electro-mechanical brake
servo eliminates the need for an additional vacuum pump
normally used in conjunction with a conventional pneumatic brake servo.

Brake fluid reservoir

The electro-mechanical brake servo offers the following key
advantages over a conventional pneumatic brake servo:
•
•
•
•

Vacuum-independent brake servo.
High pressure generation dynamics.
High pressure regulation accuracy.
Constant brake pedal characteristic/pedal force.

Motor/gear assembly

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Tandem master brake cylinder

Brake Booster Control Module

Push rod
(brake pedal connection)

19

Suspension
Overview
The suspension system of the Audi A3 Sportback e-tron is
based on the suspension system of the conventionalengined Audi A3 Sportback.

ABS/ESC module
• Carry-over from Audi A3 Sportback

Manually adjustable steering column
• Carry-over from Audi A3 Sportback

Wheels/tires
• Various e-tron light alloy wheels available. See the
Product Information Book for complete details

MacPherson front suspension
• Carry-over from Audi A3 Sportback
• Modified damper setup

Electro-mechanical steering
• Carry-over from Audi A3 Sportback

Brake system pressure accumulator
• New concept and design

Front wheel brakes
• 16“ brake system
• Brake caliper TRW PC 57-25/14
• Brake disc diameter: 12.2 in (312 mm)

20

Multi-function steering wheel
• Carry-over from Audi A3 Sportback

Four-link rear suspension
• Carry-over from Audi A3 Sportback
• Modified damper setup
• Modified anti-roll bar based on higher axle load due to high
voltage battery weight
• Partial modification of engine/transmission mounts due to
modified exhaust system

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Electro-mechanical brake servo
• First use in an Audi model

Rear wheel brakes
• 15“ brake system
• Brake caliper Continental FNC-M38
• Brake disc diameter: 10.7 in (272 mm)

21

High voltage battery
Overview of hybrid components
The following high voltage components are installed in the
Audi A3 Sportback e-tron:
Electrical brake servo
The Electrical Brake Servo is used to coordinate the braking functions of electrical braking though regeneration and the hydraulic
brake system. This provides a seamless brake feel based of the
driver’s input through the brake pedal.

Power electronics
It converts the direct current stored in the high
voltage battery to alternating current for the
e-machine. The power electronics are cooled by the
low-temperature cooling circuit 2.

PTC heater
The High Voltage Heater is used to heat the coolant for
the passenger compartment heat exchanger during electric driving and is also integrated in the stationary air conditioning function.

Engine
Four cylinder engine with turbocharger :
• 1.4l TFSI 147 hp (110 kW)

Charging port
The all-purpose charging cable can be
used to charge the high voltage battery
at both household outlets and commercial outlets using an interchangeable connecting plug (120 V AC and
240 V AC).

Electric AC compressor
The electric AC compressor is integrated into the high
voltage system and cools both the passenger compartment and the Hybrid Battery Unit as required.

22

e-machine (Electro-drive Drive Motor)
The e-machine is connected to the transmission via
clutch K0. It is able to generate a braking torque at
the wheel in dependence on RPM, battery temperature
and state of charge.

6-speed dual clutch transmission
S tronic
Consists of 2 sub-gearboxes engaged by
multi-plate clutches K1 and K2. It is
possible to select between 3 drive programs using the selector lever.

Information
All high voltage components are connected to the vehicle chassis via equipotential bonding.
The equipotential bonding is a low-resistance wire or bolted connection, connecting the high voltage components to the
vehicle chassis.

Battery cooling system
The battery cooling system is integrated into
the low-temperature cooling circuit 2.

High voltage battery module
The high voltage battery module consists of 8 modules each
with 12 prismatic cells. The voltage is between 280 and 390 V,
depending on state of charge.

Fuel tank
The fuel tank has a capacity of 10.5 gal
(40 l) and is installed over the rear axle.

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High voltage lines
All high voltage lines are double-insulated and color-coded
orange for easy recognition. To avoid incorrect assembly, the
high voltage lines are mechanically coded and identified by a
colored ring below the bayonet ring.

12 volt vehicle battery
Installed over the rear axle, it is responsible for supplying
power to the low-voltage components.

23

Hybrid Battery Unit
Hybrid Battery Unit is mounted on the underside of the
vehicle and has the following components:
•
•
•
•
•
•
•

Battery Regulation Control Module.
High voltage Battery Switch Box.
8 cell modules each with 12 battery cells and controller.
Battery cell cooling system.
Connections for the high voltage wiring harness.
Connections for the 12 volt electrical system.
Coolant connections.

The bottom section of the Hybrid Battery Unit housing is
made from cast aluminum and the top section from
polymer. The sections are bolted and bonded forming and
airtight housing.

Rated voltage

352

Cell voltage

3.7

Number of cells

96

Capacitance in Ah

25

Operating temperature

-18 to 140 °F
(-28 to 60 °C)1)

Energy content in kWh

8.8

Usable energy content in
kWh

7.02)

Power in kW

Maximum 90

Weight

264 lb (120 kg)

The charging/discharging currents are reduced at temperatures of 122 °F
(50 °C) and higher.
2)
The state of charge is maintained at between 25% and 85%.
1)

Pressure changes inside the housing caused by temperature
variation are equalized by the pressure equalization elements. If the pressure inside the Hybrid Battery Unit is too
high, the pressure relief valve opens.
The pressure equalization elements and the pressure relief
valve are installed under a cover on the top side of the
Hybrid Battery Unit.
The Hybrid Battery Unit is attached to the vehicle chassis by
an equipotential bond.

High voltage Battery Switch Box

Housing upper shell (polymer)

Insulation

Battery Regulation Control Module

Heat sink of Hybrid Battery Unit

Housing upper shell (aluminium casting)

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24

Charging
High Voltage Battery Charging Socket 1
The High Voltage Battery Charging Socket 1 is located
behind a flap at the front of the radiator grille.

It is connected to the vehicle chassis via equipotential
bonding.

Both the Charging Socket Temperature Sensor 1 and the
High voltage Charging Connector Lock 1 Adjuster are integrated with the High-voltage Battery Charging Socket.

Communication
Allows communication between vehicle
and charging station

L1
Phase 1

N
Neutral conductor

PE
Protective earth (ground)
Not assigned
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Charging button module with display
The charging button module has the following components:
Charging Profile Selection Button

• Intermediate Charging Button.
• Charging Profile Selection Button.
• Charging Socket LED Module 1.
The Charging Socket LED Module indicates the current status
of the charging cycle through various colors and by flashing or
steady light. The active charging option is indicated by the red
LED in the button.

Charging Socket LED Module 1

Intermediate Charging Button

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Overview of status LED messages
Display

Definition

LED is red

Plug has been detected, but is not locked;
charging is not possible

LED is yellow

Plug has been detected and is not locked, but no charging voltage is
available; charging is not possible

LED is flashing yelow

Plug has been detected and is locked,
selector lever not in position P; charging is not possible

LED flashes green every 4 s for 60 s, then the
LED goes out

Timer for charging cycle is active, charging cycle starts depending on
the programmed departure time

LED is flashing green

Charging cycle is active

LED lights up green and then the LED goes out

Charging cycle completed

25

Charging the high voltage battery
Charging with alternating current
When the vehicle is using the internal combustion engine
to provide drive, the high voltage battery is charged via the
e-machine, which acts as a generator.

Audi e-tron charging system
The Audi A3 Sportback e-tron comes with the Audi e-tron
charging system. For mobile use, the Audi e-tron charging
system can be carried in a transport case.
Two replaceable AC cables are supplied for connecting to a
three-phase AC supply. One cable is suitable for household
(120V) use while the other cable is for attaching to a 240V
AC source.

The high voltage battery can be charged with alternating
current from both a 240V AC or 120V AC voltage. Charging
the vehicle with AC voltage will allow for a greater range of
electric driving by charging the vehicle battery prior to
driving.
Operating unit
The cables are encoded in such a way that the operating
unit can detect whether a connection has been made with a
120V or 240V plug.
If the vehicle is connected with 240V AC source, the
maximum power consumption is 16 A, resulting in a
maximum charging output of 3.6 kW. If the vehicle is
connected to a 120V outlet, power consumption is limited
to 10 A.
The charging output can be set to 50% or 100% by the
user. If the vehicle is connected to 240V AC, a charging
output of 50% is set automatically. This setting is maintained until the charger unit is disconnected from the
vehicle or the wall socket.

Status LED
Safety glass
Monochrome display
Capacitive operating panel

To prevent unauthorized access, the operating unit can be
protected by entering a 4-digit PIN code. If a customer
were to forget their PIN number, it can be re-set by dealership personnel.
Before the charging cycle begins, the operating unit and
the high voltage charger unit in the vehicle communicate
with one another.
The operating unit has a self-diagnosis function and indicates any faults detected via the display.
The operating unit has a temperature monitor. If the permissible temperature is exceeded, the charging cycle is
interrupted until the temperature returns to an acceptable
level.
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Charging cable
Housing

Protective frame

Vehicle cable

A charging cable is connected from an AC power source to
the Audi e-tron charger unit.

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Information
The charging cable must always be connected directly to a socket. Never use the charging cable together with an extension
cord, a cable drum, a multiple socket outlet or a timer. Failure to heed this warning can result in damage to the operating
unit or the home electrical system.
26

Charging at home
A charging dock for home installation is available. It can be
attached to a wall over a conventional household power
outlet.

The vehicle battery charger can be clipped into the charging
dock. Charging cables are available in various lengths for
connecting the vehicle to the charging dock.

Integrated mounting fixture
available through Audi accessories

Fold-out front made from printed
safety glass

Front recess with mount for the
operating unit of Audi e-tron
charging system

Mechanical lock for securing the
supplied Audi e-tron charging
system
Receptacle for the vehicle cable
with plug

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27

Notes

28

Charging cycle
To charge the high voltage battery, the charging cable must