SSP 228 Variable automatic gearbox multitronic 01J [188s].pdf

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228
Service.
Variable Automatic Gearbox
multitronic
®
01J
Design and Function
Self-Study Programme 228
For internal use only
multitronic
®
The name multitronic
®
stands for the new
variable automatic gearbox developed by
Audi.
The variable automatic gearbox is commonly
known as the CVT gearbox.
The CVT concept improved by Audi is based
on the long-established principle of the
“chain drive transmission”. According to this
principle, the reduction ratio between the
shortest and the longest ratio can be
controlled steplessly by means of a so-called
“variator”.
CVT is the English abbreviation for
“Continuously
Variable Transmission”.
228_023
The new Audi multitronic
®
with Tiptronic function offers a synergy of the best possible
dynamics, optimal fuel utilisation and the highest possible level of drive comfort.
2
Contents
Page
Introduction
multitronic
®
............................................................................ 2
The gearbox concept .............................................................. 9
Specifications ........................................................................10
Gearbox modules
The flywheel damper unit .................................................... 11
Sectional view of gearbox ....................................................13
The forward clutch/reverse clutch
with planetary gear train ..................................................... 14
The clutch control ................................................................. 20
The clutch cooling system.................................................... 28
The auxiliary reduction gear step ....................................... 31
The variator ............................................................................32
The transmission control ..................................................... 35
The torque sensor ................................................................. 38
The splash oil cover .............................................................. 43
The chain ............................................................................... 44
The oil supply .........................................................................47
Electrohydraulic control .......................................................52
Selector shaft and parking lock ...........................................56
Gearbox housing/ducting and sealing systems ................ 57
Hydraulic chart .......................................................................60
ATF cooling system ............................................................... 62
Gearbox control
Control unit for multitronic J217 ......................................... 63
Sensors .................................................................................. 66
CAN information interchange, multitronic
®
...................... 75
Auxiliary signals/interface ....................................................76
Function diagram ................................................................. 80
Dynamic control program (DCP) ......................................... 82
Service
Towing ....................................................................................91
Update programming (flash programming) ...................... 92
Special tools/workshop equipment .................................... 96
The Self-Study Programme contains information about
designs and functions.
The Self-Study Programme is not a Workshop Manual!
New!
Note!
Important!
Note!
Please refer to the relevant Technical literature for all
maintenance and repair instructions.
3
Introduction
Gearboxes are required in order to match the
torque characteristic of the internal
combustion engine to the vehicle.
In the main, multi-step reduction gears are
used such as manual gearboxes, automated
manual gearboxes and multi-step automatic
reduction gears.
A multi-step reduction gear always represents
a compromise between handling dynamics,
fuel economy and driving comfort.
In an internal combustion engine, torque flow
is not intermittent, rather it is continuous. A
variable ratio is, therefore, ideal with regard
to engine power utilisation.
The CVT concepts which have been available
on the market until now are also based upon
the "chain drive principle“. On account of
their limited power transmission, however,
they are only suitable for subcompact cars
and vehicles in the lower mid-range segment
with low engine performance. As the results
of independent tests show, these CVT
concepts have yet to impress in terms of
driving performance.
Audi also chose the belt/chain drive principle
for the development of its CVT gearbox, since
it is the most advanced form of transmission
available today.
Audi's objective was to develop a CVT
gearbox for high-performance premium
segment vehicles that sets new standards in
terms of driving performance and fuel
economy, as well as in handling dynamics
and comfort.
Manual gearbox
R 1
3 5
2
4
CVT stepped mode
multitronic
®
P
P
R
N
R
N
D
4
3
2
D
228_002
4
The innovations incorporated by Audi and its
development partners in the course of
advanced development work will surpass
existing gearbox concepts with regard to all
the characteristics mentioned above.
Audi is therefore the first car-maker
to present a CVT gearbox which can
be used in combination with 2.8-ltr.
V6 engines for power and torque
ratings of 200 bhp and 300 Nm
respectively.
Basic principle
The key component part of the multitronic
®
is
the variator. It allows reduction ratios to be
adjusted continuously between the starting
torque multiplication ratio and the final
torque multiplication ratio.
As a result, a suitable ratio is always available.
The engine can always operate within the
optimum speed range regardless of whether
it is optimised for performance or fuel
economy.
The variator comprises two tapered disc pairs
- a set of primary pulleys (pulley set 1) and a
set of secondary pulleys (pulley set 2) - as well
as a special chain which runs in the V-shaped
gap between the two tapered pulley pairs.
The chain acts as a power transmission
element.
Pulley set 1 is driven by the engine by means
of an auxiliary reduction gear step. Engine
torque is transmitted via the chain to pulley
set 2 and from here to the final drive.
One of the tapered pulleys in each of the sets
of pulleys can be shifted on the shaft for
variable adjustment of the chain track
diameter and transmission ratio.
The two sets of pulleys must be adjusted
simultaneously so that the chain is always
taut and the disc contact pressure is
sufficient for transmission purposes.
228_043
Set of primary pulleys
(pulley set 1)
Set of secondary pulleys
(pulley set 2)
Drive
Downforce
Narrow
Wide
This gearbox a is known as a
chain drive transmission because
of its design.
5

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