Self-Study Programme 491 1 4L TFSI engine with dual charging.pdf

Self Study Programme 491

Audi

1.4l TFSI Engine with Dual Charging

Audi

Service Training

The 1.4l 136kW TFSI engine is a top-of-the-range addition to the

Audi A1 series.

The combination of a Roots blower and exhaust gas turbocharging

is reﬂ ected in spontaneous throttle response and high pulling

power, even at high driving speeds.

The Roots blower cuts in at 1500 rpm and, in most situations, cuts

out again at 2400 rpm.

At the latest by 3500 rpm, the turbocharger does all the work.

Since it has little work to do at low engine speeds, the Roots

blower is large in size and designed for high e ciency.

Thanks to TFSI * technology, which combines e ciency and dynam-

ics, all Audi models featuring the new 1.4l 136 kW TFSI engine

continue Audi's successful concept of downsizing*.

In the Audi A1, the engine consumes on average just 5.9 litres of

fuel per 100 km. Speciﬁ c power output is 97.8 bhp per litre, yet

CO 2 emissions are only 139 g/km.

Petrol direct injection, the Roots blower and the turbocharger

make for a perfect combination. The engine is rated for a high

compression ratio of 10.0 : 1. This enhances thermodynamics,

resulting in increased power output and economy.

The three-door Audi A1 with 1.4l 136kW TFSI engine sprints from

zero to 100 kph in 6.9 seconds and has a top speed of 227 kph.

491_002

Learning objectives of this Self Study Programme:

In this Self Study Programme you will learn about the technology

of the 1.4l 136kW TFSI engine.

When you have worked your way through this Self Study Pro-

gramme, you will be able to answer the following questions:

•

How is the basic engine designed?

•

What are the di erences between the 1.4l 136kW TFSI engine

and the TFSI engines used previously by Audi?

•

How does the engine's air supply system work?

•

What are the points to note when servicing the vehicle?

Contents

Introduction

Speciﬁ cations ________________________________________________________________________________________________________________________________________________ 5

Engine mechanicals

Cylinder block _______________________________________________________________________________________________________________________________________________ 6

Crank mechanism ___________________________________________________________________________________________________________________________________________ 7

Poly V-belt drive _____________________________________________________________________________________________________________________________________________ 8

Chain drive ___________________________________________________________________________________________________________________________________________________ 9

Cylinder head _______________________________________________________________________________________________________________________________________________ 10

Crankcase ventilation ______________________________________________________________________________________________________________________________________ 12

Oil supply

Oil circuit ____________________________________________________________________________________________________________________________________________________ 14

Oil pump ____________________________________________________________________________________________________________________________________________________ 15

Oil ﬁ lter _____________________________________________________________________________________________________________________________________________________ 15

Air supply

System overview ___________________________________________________________________________________________________________________________________________ 16

Operating ranges of the twin charging system _________________________________________________________________________________________________________ 17

Twin charging with Roots blower and exhaust gas turbocharger _____________________________________________________________________________________ 20

Components of the exhaust turbocharging system ____________________________________________________________________________________________________ 21

Roots blower ________________________________________________________________________________________________________________________________________________ 22

Drive _________________________________________________________________________________________________________________________________________________________ 22

Function _____________________________________________________________________________________________________________________________________________________ 24

Sensors and actuators _____________________________________________________________________________________________________________________________________ 26

Charge air cooling __________________________________________________________________________________________________________________________________________ 29

Exhaust system

Overview ____________________________________________________________________________________________________________________________________________________ 30

Cooling system

Dual-circuit cooling system _______________________________________________________________________________________________________________________________ 31

Fuel system

System overview ___________________________________________________________________________________________________________________________________________ 33

Engine management

System overview of the 1.4l 136kW TFSI engine _______________________________________________________________________________________________________ 34

Sound actuator system

Introducti o n ________________________________________________________________________________________________________________________________________________ 36

System overview ___________________________________________________________________________________________________________________________________________ 37

Diagnostics _________________________________________________________________________________________________________________________________________________ 38

Service

Sight glass for seals _______________________________________________________________________________________________________________________________________ 39

Maintenance operations ___________________________________________________________________________________________________________________________________ 40

Annex

Glossary _____________________________________________________________________________________________________________________________________________________ 41

Test your knowledge _______________________________________________________________________________________________________________________________________ 42

Self Study Programmes ___________________________________________________________________________________________________________________________________ 43

• The Self Study Programme teaches a basic knowledge of the design and functions of new models, new

automotive components or new technologies.

It is not a Repair Manual! Figures are given for explanatory purposes only and refer to the software version

valid at the time of preparation of the SSP.

For maintenance and repair work, always refer to the current technical literature.

Terms written in italics or indicated by an asterisk are explained in the glossary at the back of this Self Study

Programme.

Note

Reference