Self-Study Programme 45 1.2-ltr. 3-cylinder petrol engines.pdf
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5895 KB
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Pobierz
... 3 cylinders for
Š
koda cars!
SP45_11
A new 3-cylinder petrol engine will in future form the entry-level engine
for
koda models. It is a completely new development and will be
available in the
Š
Š
koda
Fabia.
Initially, it will be available as a 6-V engine version with 2 valves for each
cylinder; at a later date a 12-V version with 4 valves for each cylinder and
increased power output will be available.
Essentially, the engine has been designed in conformity with the proven
design principles which exist within the Group. Cylinder block and
cylinder head are light-alloy components. The camshaft and the oil pump
are both driven by means of a chain. The valve gear is equipped with
hydraulic valve clearance compensation elements.
A balance shaft ensures low-vibration running.
2
GB
Contents
Introduction
4
Technical highlights
4
Specifications
5
Engine Mechanical Components
6
Overview of engine
6
Main components of engine housing
7
Crank assembly with balance shaft
8
Camshaft drive and valve gear
10
Oil pump drive of 2-valve engine version,
camshaft drive and valve gear
11
Oil pump drive of 4-valve engine version,
crankcase fresh air supply and ventilation
12
Cooling System
17
Overview
17
Engine Management
18
System overview
18
Single-spark ignition coils with power output stage
20
Two-probe lambda control
21
Overview of system components
22
Simos 3PD/3PE engine management system
24
Function Diagram
26
Service
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You will find notes on inspection and
maintenance, setting and repair instructions
in the Workshop Manual.
3
GB
Introduction
Technical highlights
The 1.2-ltr. inline engine available with
2 valves, and also with 4 valves per cylinder,
opens up a new chapter in the range of
Š
koda
engines and enlarges the choice for
Š
koda
models.
SP45_48
SP45_49
... with 4 valves per cylinder
... with 2 valves per cylinder
The technical highlights are:
– Crankshaft with 6 balance weights running
in 4 bearings
– Camshaft driven by crankshaft by means of
a chain; oil pump likewise chain-driven
– Timing chain tensioned by hydraulic
tensioning device, chain for oil pump drive
tensioned mechanically
– Cylinder block split at level of middle of
crankshaft
– Balance shaft for reducing vibrations
– Cross-flow cooling in cylinder head
– 4-valve engine without fuel return-flow
line, fuel filter with integrated fuel pressure
regulator
– 2-valve engine with fuel return-flow line,
fuel pressure regulator at fuel distribution
pipe
– Upright oil filter located at exhaust side in
top part of cylinder block, filter element
replaceable from above
– Crankcase ventilation with fresh air flow into
ventilation system, PCV (
P
ositive
C
rankcase
entilation) control valve
– Oil level/temperature sender installed into
oil pan from above through timing case
(extended service interval)
– Plastic intake manifold
– Electronic Power Control
– Single-spark ignition coils
– Post-treatment of exhaust gases with
2 step-type lambda probes on 2-V engine,
catalytic converter close to engine
– Post-treatment of exhaust gases with
1 broadband lambda probe as upstream-cat
probe and one step-type probe as
downstream-cat probe on 4-V engine,
catalytic converter close to engine
– Electric exhaust gas recirculation valve on
4-V engines
– Air filter with integrated control for blending
of warm air
V
4
GB
Specifications
Engine characteristic - AWY
Engine characteristic - AZQ
50
50
40
40
110
110
100
100
30
30
90
90
80
80
70
20
20
70
10
10
SP45_15
1000
2000
3000
4000
5000
SP45_29
1000
2000
3000
4000
5000
n (1/min)
n (1/min)
Engine code
AWY
AZQ
Type
3-cylinder inline engine with 2
valves per cylinder
3-cylinder inline engine with 4
valves per cylinder
3
3
Displacement
1198 cm
1198 cm
Alésage
76.5 mm
76.5 mm
Course
86.9 mm
86.9 mm
Compression ratio
10.3 : 1
10.5 : 1
-1
-1
Max. power output
40 kW at 4750 rpm
47 kW at 5400 rpm
-1
-1
Max. torque
106 Nm at 3000 rpm
112 Nm at 3000 rpm
Engine management system
Simos 3PD (Multipoint)
Simos 3PE (Multipoint)
Fuel
Unleaded petrol RON 95 (91
possible with reduction in output)
Unleaded petrol RON 95 (91
possible with reduction in output)
Emission standard
EU4
EU4
5
GB
Engine Mechanical Components
Overview of engine
The illustrations show the 2-valve engine version
Front view
Side view
Upstream-cat
lambda probe
Coolant
thermostat
housing
Warm air inlet
connection
Vacuum valve
(crankcase ventilation)
Tensioning pulley
Intake manifold
Alternator
Guide
pulley
Oil filter
Catalytic converter
with shields
Clutch flange
Coolant
pump
AC compressor
Alternator
SP45_06
SP45-07
AC compressor
Downstream-cat
lambda probe
Oil level/
temperature sender
Crankshaft belt
pulley
The cylinder block is split at the level of the
middle of the crankshaft. The bottom part is a
bearing bridge which is particularly stable in
design and consists of a single part. This also
performs the task of the otherwise usual
bearing caps and, as a result of its compact
design, contributes to good mounting of the
crankshaft.
The bottom part also integrates a balance
shaft which is responsible for ensuring low-
vibration running of the engine.
Exhaust manifold and catalytic converter form
a compact single assembly. The upstream-cat
lambda probe is installed from above into the
exhaust manifold directly upstream of the
catalytic converter.
The downstream-cat lambda probe is located
in the exhaust pipe downstream of the
catalytic converter.
Warm air is inducted from the area between
exhaust manifold/catalytic converter and the
matching cover through the warm air inlet
connection to the air filter.
The ventilation of the crankcase features a
PCV control valve.
The ratio of cold and warm inducted air is
controlled by means of regulating flap in
combination with a thermostat. The control
mechanism is integrated in the air filter.
Ignition in the respective cylinder is
performed by individual ignition modules
(single-spark ignition coils).
6
GB
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