Audi 09D Transmission.pdf

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The Audi

The Audi 09D Automatic Tr

09D Automatic Transmission

ansmission

Self-Study Program 951703

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All rights reserved. All information contained in this manual isthis manual is based on the latest information available at the time of printing based on the latest information available at the time of printing and is subject to the copyright and other intellectual property and is subject to the copyright and other intellectual property rights of Audi of America, Inc., its afﬁliated companies, and its rights of Audi of America, Inc., its afﬁliated companies, and its licensors. All rights are reserved to make

licensors. All rights are reserved to make changes at any timechanges at any time without notice. No part of this document may be reproduced, without notice. No part of this document may be reproduced, stored in a retrieval system,

stored in a retrieval system, or transmitted in any form or byor transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or any means, electronic, mechanical, photocopying, recording, or otherwise, nor may these materials be modiﬁed or reposted to otherwise, nor may these materials be modiﬁed or reposted to other sites without the prior expressed written permission of the other sites without the prior expressed written permission of the publisher.

publisher.

All requests for permission to copy and redistribute information All requests for permission to copy and redistribute information should be referred to Audi of America, Inc.

should be referred to Audi of America, Inc. Always check T

Always check Technical Bulletins and the echnical Bulletins and the latest electronic repairlatest electronic repair literature for information that may supersede

literature for information that may supersede any informationany information included in this booklet.

included in this booklet.

Trademarks: All brand names and product names used in Trademarks: All brand names and product names used in thisthis manual are trade names, service marks, trademarks, or registered manual are trade names, service marks, trademarks, or registered trademarks and are the property of their respective owners. trademarks and are the property of their respective owners.

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The Self-Study Program teaches the design and function of new vehicle models, The Self-Study Program teaches the design and function of new vehicle models, automotive components, and technologies.

automotive components, and technologies.

The Self-Study Program is not a Repair Manual! The Self-Study Program is not a Repair Manual!

The values given are only intended as a guideline. Refer to The values given are only intended as a guideline. Refer to the software version valid at the time of publication of the SSP. the software version valid at the time of publication of the SSP.

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

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The 09D

The 09D Six-Speed Aut

Six-Speed Automatic T

omatic Transmission in the Audi Q7

ransmission in the Audi Q7

Unlike the Audi longitudinal AWD conﬁgurations Unlike the Audi longitudinal AWD conﬁgurations where the front axle differential and

where the front axle differential and transfer case aretransfer case are integrated with the transmission, the 09D six-speed integrated with the transmission, the 09D six-speed automatic transmission in the Audi Q7

automatic transmission in the Audi Q7 is designed as anis designed as an independent component.

independent component.

The powertrain of the Audi Q7

The powertrain of the Audi Q7 has a modularhas a modular conﬁguration. This means that the various conﬁguration. This means that the various subassemblies – the transmission, the front a subassemblies – the transmission, the front axlexle differential, and the transfer case – are separate units. differential, and the transfer case – are separate units.

Note Note

In addition to the general descriptions In addition to the general descriptions of the 09D transmission, this of the 09D transmission, this Self-Study Program covers special features Study Program covers special features in the context of the Audi Q7.

in the context of the Audi Q7.

For information about the power For information about the power transmission in the Audi Q7 and transmission in the Audi Q7 and transfer case 0AQ,

transfer case 0AQ, refer to Self-Studyrefer to Self-Study Progr

Program 993603, The am 993603, The Audi Q7 Audi Q7 PowerPower Transmission. Transmission. Rear Axle Rear Axle Differential 0AB Differential 0AB

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2 2

367_093

The 09D transmission can transmit up to 553.1 lb ft The 09D transmission can transmit up to 553.1 lb ft (750 Nm) of engine torque and is currently used in (750 Nm) of engine torque and is currently used in combination with the most powerful engines in the combination with the most powerful engines in the Audi Q7.

Audi Q7.

–

– A special low ATF pickA special low ATF pick-up point and a high ATF-up point and a high ATF capacity ensure reliable oil intake in rough terrain. capacity ensure reliable oil intake in rough terrain. –

– A large AA large ATF cooler maintains the ATF temperature at aTF cooler maintains the ATF temperature at a safe level.

safe level. –

– The elevated transmission brThe elevated transmission breather hose preventseather hose prevents ingress of water into the transmission, even ingress of water into the transmission, even underunder adverse conditions.

adverse conditions. –

– A large torque converter with A large torque converter with lockup clutch reduceslockup clutch reduces heat build-up in the ATF and allows powe

heat build-up in the ATF and allows power to ber to be transmitted directly.

transmitted directly.

Special Features Designed for Off-Road Use

Front Axle Differential 0AA

Tr

Transfer Case ansfer Case 0AQ 0AQ

Six-Speed Automatic

Tr

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Speciﬁcations

Transmission Transmission Breather Breather 367_008 367_008 367_010 367_010 Transmission Transmission Breather Breather Electrical Electrical Connections Connections Manufacturer Manufacturer Serial Number Serial Number Manufacturer Manufacturer Part Number Part Number AISIN Model AISIN Model Number Number Production Date Production Date Transmission Transmission Code Code 367_009 367_009

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4 4 Speciﬁcations Speciﬁcations D Deevveellooppeerr//MMaannuuffaaccttuurreerr AAIISSIIN N AAW W COCO. L. LTTD D JJaappaann D Deessiiggnnaattiioonnss MMaannuuffaaccttuurreerr: T: TRR--6600SSNN Audi

Audi AG: AG: AL750-6QAL750-6Q Service: 09D Service: 09D T

Trraannssmmiissssiioon n TTyyppee EElleec tc trroo--hhyyddrra ua ulliic ac alllly y CCoonnt rt roolllleed Sd Siixx--SSppe ee ed d PPllaanneet at arry y GGe ae arr (step automatic transmission) with a Planetary Gear Set Concept (step automatic transmission) with a Planetary Gear Set Concept Based on the Lepelletier Principle.

Based on the Lepelletier Principle. Hydro-dynamic Torq

Hydro-dynamic Torque Converter with ue Converter with Slip-Controlled Lockup Clutch.Slip-Controlled Lockup Clutch. Designed for Longitudinal Installation

Designed for Longitudinal Installation in Combination with in Combination with a Transfera Transfer Case

Case C

Coonnttrrooll HyHyddrraauulliic c CCoonnttrrool l MoModduulle e ((vvaallvve e aasssseemmbbllyy) ) iin n ththe e OOiil l SuSummp p wwiitthh External Electronic Control Module.

External Electronic Control Module.

Dynamic Shift Program (DSP) with Separate Sport

Dynamic Shift Program (DSP) with Separate Sport Program inProgram in “Position S” and Tiptronic Shift Program for Manual Gear

“Position S” and Tiptronic Shift Program for Manual Gear ShiftingShifting (optionally available with Tiptronic steering wheel).

(optionally available with Tiptronic steering wheel). Special Feature: in Tiptronic Mode, it

Special Feature: in Tiptronic Mode, it is Possible to Start in Secondis Possible to Start in Second Gear. Gear. M Maaxxiimmuum m TToorrqquuee 555533..1 1 llb b fft t ((77550 0 NNmm) ) DDeeppeennddiinng g oon n TTyyppee Ratios: Ratios: Planetary

Planetary TransmisTransmissionsion

1st 1st Gear Gear 4.1484.148 2nd Gear 2.370 2nd Gear 2.370 3rd Gear 1.556 3rd Gear 1.556 4th Gear 1.155 4th Gear 1.155 5th Gear 0.859 5th Gear 0.859 6th Gear 0.686 6th Gear 0.686 R R Gear Gear 3.3943.394 S Spprreeaadd 66..0055 A ATTF F SSppeecciifificcaattiioonn RReeffeer r tto o EETTKKAA A ATTF F SSeerrvviiccee AApppprrooxxiimmaatteelly y 99..5 5 qt qt ((99..0 0 LL)) (new filling) Lifetime Filling (new filling) Lifetime Filling W

Weeiigghhtt BBeettwweeeen n 221133..8 8 - - 224422..5 5 llb b ((997 7 - - 11110 0 kkgg)) L

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Cutaway View of the 09D Transmission

Brake B1

Tr

Transmission Input ansmission Input SpeedSpeed

(RPM) Sensor G182

ATF Pump

ATF Str

ATF Strainer/Filterainer/Filter

Freewheel Freewheel Clutch K3 Clutch K3 Clutch K1 Clutch K1

Manual Selector Lever

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6 6

367_011

Tr

Transmission ansmission OutputOutput

Speed (RPM) Sensor G195

Locking Pawl for

Parking Lock Parking Lock Electrical Pressure Electrical Pressure Control Valve Control Valve ATF

Pick- ATF Pick-up Pointup Point

Brake B2 Brake B2 Clutch K2 Clutch K2 Shift Solenoid Shift Solenoid

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Gear Selector

Connection to

Tr

Speed (RPM) Sensor G195

Tr

Transmission ansmission ControlControl

Module J217 Module J217 Electromagnetic Valves Electromagnetic Valves (actuators) (actuators) Connection to Connection to Transmission Transmission Input Speed (RPM) Input Speed (RPM) Sensor G182 Sensor G182 Multi-Function Multi-Function Tr

Transmission Range ansmission Range (TR)(TR)

Switch F125 Switch F125 Hydraulic Hydraulic Control (valve Control (valve assembly) assembly) 367_066 367_066

Connector for Sensors

Connector for Actuators

Bottom View of the Transmission — Looking at the Hydraulic Control (valve

Bottom View of the Transmission — Looking at the Hydraulic Control (valve assembly)assembly)

Hydraulic Parts, Hydraulic Control, ATF

Legend to Sectional View of Transmission

Components of Planetary Gear Sets

Shafts and Gears

Multi-Plate Clutches, Bearings, Washers,

Plastics, Seals, Rubber, and Washers

Components of Shift Elements

Cylinders, Pistons, and Air Sensor Plates

Housings, Screws, and Bolts

Electrical Components Electrical Components Transmission Transmission Fluid Temperature Fluid Temperature Sensor G93 Sensor G93

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8 8

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Torque Converter

In the 09D transmission, torque is transmitted from the In the 09D transmission, torque is transmitted from the engine to the transmission by a

engine to the transmission by a hydro-dynamic torquehydro-dynamic torque converter with slip-controlled lockup clutch.

converter with slip-controlled lockup clutch.

Different types of torque converters are used depending Different types of torque converters are used depending on engine power output and characteristics.

on engine power output and characteristics. They differ in respect of the following: They differ in respect of the following: – size (capacity)

– size (capacity)

– torque conversion factor – torque conversion factor –

– torque converter torque converter characteristiccharacteristic – torsion damper

– torsion damper –

– lockup clutch lockup clutch conﬁgurationconﬁguration

Mounting

The torque converter runs in a

The torque converter runs in a wear resistant rollerwear resistant roller bearing. This design provides a durable mounting bearing. This design provides a durable mounting particularly in operating states with slow oil feed (for particularly in operating states with slow oil feed (for example, during cold starting).

example, during cold starting).

Roller Bearing Roller Bearing 367_077 367_077 367_075 367_075 Torque Torque Converter Converter Lockup Lockup Clutch Clutch Conﬁguration: Typical Conﬁguration: Typical Torsion Torsion Damper Damper

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10 10

Torque Converter Mounting

367_071 367_071 Pinion Pinion ATF Pump ATF Pump Ring Gear Ring Gear Driver Driver Pinion Pinion Driver Driver Torque Torque Converter Hub Converter Hub Roller Bearing Roller Bearing Mounting Depth Mounting Depth -Torque Converter Torque Converter ATF Pump ATF Pump (removed) (removed) Note Note

When installing the torque converter When installing the torque converter and before installing the transmission, and before installing the transmission, special care must be taken to ensure special care must be taken to ensure the ATF pump drivers engage properly the ATF pump drivers engage properly into the grooves on the torque

into the grooves on the torque converter hub. This can be checked converter hub. This can be checked by measuring the installed position by measuring the installed position of the torque converter (refer to the of the torque converter (refer to the Workshop Manual).

Workshop Manual). Note

Note

Always make sure the mounting Always make sure the mounting bushings are installed correctly bushings are installed correctly between the engine and the between the engine and the transmission. Missing bushings will transmission. Missing bushings will result in irreparable damage to the result in irreparable damage to the roller bearing, the torque converter roller bearing, the torque converter hub, and the shaft oil seal due to hub, and the shaft oil seal due to offset between the engine and the offset between the engine and the transmission.

transmission.

ATF Pump

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Torque Converter Lockup Clutch

Conﬁguration:

Conﬁguration: TypTypicalical

367_035 367_035 Torque Converter Torque Converter Lockup Clutch Lockup Clutch Torsion Torsion Damper Damper

Design

The torque converter has a lockup clutch w

The torque converter has a lockup clutch with integratedith integrated torsion dampers. The torsion dampers reduce torsional torsion dampers. The torsion dampers reduce torsional vibration when the torque converter lockup clutch is vibration when the torque converter lockup clutch is closed. This allows the operating range “converter closed. This allows the operating range “converter lockup clutch closed” to be extended.

lockup clutch closed” to be extended.

Basically, distinctions are made between the

Basically, distinctions are made between the followingfollowing functional states:

functional states: –

– Converter Lockup Clutch Converter Lockup Clutch - Open- Open –

– Converter Lockup Clutch - CConverter Lockup Clutch - Controlled Operationontrolled Operation –

– Converter Lockup Clutch Converter Lockup Clutch - Closed- Closed

During normal vehicle operation, the lockup clutch is During normal vehicle operation, the lockup clutch is engaged in 4th gear and higher (upwards of speeds of engaged in 4th gear and higher (upwards of speeds of approximately 24.8 mph [40 kph]).

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12 12

Controlled Operation

At deﬁned operating points, the lockup clutch is At deﬁned operating points, the lockup clutch is operated with a low slip (controlled operation). operated with a low slip (controlled operation).

Controlled operation provides better fuel economy than Controlled operation provides better fuel economy than with the converter lockup clutch open and better driving with the converter lockup clutch open and better driving comfort than with the converter lockup clutch closed. comfort than with the converter lockup clutch closed.

367_039

Converter Lockup Clutch - Open

Converter Lockup Clutch

- Controlled

- Controlled Converter Lockup Clutch - ClosedConverter Lockup Clutch - Closed

Road Speed Road Speed E E n n g g i

i n n e e

L L o o a a d d

In Tiptronic mode and in the “S” program,

In Tiptronic mode and in the “S” program, the converterthe converter lockup clutch is closed at the earliest possible moment. lockup clutch is closed at the earliest possible moment. The direct frictional engagement between the engine The direct frictional engagement between the engine and the transmission accentuates the sporty driving and the transmission accentuates the sporty driving feel.

feel.

In the hill-climbing program, the converter lockup clutch In the hill-climbing program, the converter lockup clutch is closed in 3rd gear.

is closed in 3rd gear.

In the Hot-mode program, the lockup clutch is no longer In the Hot-mode program, the lockup clutch is no longer operated in a controlled manner, but is closed early to operated in a controlled manner, but is closed early to reduce heat transfer due to friction in the lockup clutch reduce heat transfer due to friction in the lockup clutch and hydro-dynamic power transmission.

and hydro-dynamic power transmission.

Reference Reference

Please see page 47 for a description of Please see page 47 for a description of the Hot-mode program.

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Oil Supply/Lubrication

ATF (Aut

omatic

T

ransm

ission Flui

d)

As mentioned previously, the 09D transmission is As mentioned previously, the 09D transmission is designed as an independent component, without the designed as an independent component, without the usual integrated transfer case and front axle differential. usual integrated transfer case and front axle differential. This is why the 09D transmission only has a single ATF This is why the 09D transmission only has a single ATF oil supply.

oil supply.

The exacting requirements with regard

The exacting requirements with regard to shift quality,to shift quality, functional reliability, and ease of maintenance put functional reliability, and ease of maintenance put extreme demands

extreme demands on the ATF.on the ATF.

The ATF is a key factor influencing the coefficient of The ATF is a key factor influencing the coefficient of friction of the clutches

friction of the clutches and brakes. For this reason, ATFand brakes. For this reason, ATF development is carried out in parallel with the design development is carried out in parallel with the design and testing phases.

and testing phases.

No ATF change is normally needed within the No ATF change is normally needed within the maintenance intervals. If

maintenance intervals. If the ATF has to be changed afterthe ATF has to be changed after repairs or for some other reason, the adaption values repairs or for some other reason, the adaption values must be cleared and an adaption drive performed using must be cleared and an adaption drive performed using the VAS Scan Tool. Refer to the “

the VAS Scan Tool. Refer to the “Transmission Adaption”Transmission Adaption” section on page 55. section on page 55. ATF Pump ATF Pump Housing Housing 367_050 367_050 Thrust Plate Thrust Plate Driver on Driver on Pinion Pinion Torque Torque Converter Converter Roller Roller Bearing Bearing Intake Port Intake Port Stator Stator Shaft Shaft

ATF Pum

p

Ring Gear Ring Gear Pinion Pinion 367_052 367_052

ATF Pump (fully assembled)

Roller Roller Bearing Bearing Stator Stator Shaft Shaft Note Note

Only use the ATF speciﬁed for the 09D Only use the ATF speciﬁed for the 09D transmission.

transmission.

Use a separate, dedicated ATF ﬂuid Use a separate, dedicated ATF ﬂuid container for Special Tool VAG 1924 to container for Special Tool VAG 1924 to avoid contaminating

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14 14

The A

The ATF pump is designed TF pump is designed as an internal gear pumpas an internal gear pump (duocentric pump). It is directly driven by the engine via (duocentric pump). It is directly driven by the engine via the converter housing and the converter hub.

the converter housing and the converter hub.

Two grooves on the torque converter hub engage Two grooves on the torque converter hub engage thethe pinion drivers. The torque converter hub runs on pinion drivers. The torque converter hub runs on low- low-friction bearings in the pump housing.

friction bearings in the pump housing. ATF Pump ATF Pump Housing Housing Roller Roller Bearing Bearing Stator Stator Shaft Shaft 367_094 367_094 367_053 367_053 Thrust Thrust Plate Plate Driver Driver Ring Ring Gear

Gear _Pinion_Pinion

Note Note

When installing the torque converter When installing the torque converter and before installing the transmission, and before installing the transmission, special care must be taken to ensure special care must be taken to ensure the ATF pump drivers engage properly the ATF pump drivers engage properly into the grooves on the torque

into the grooves on the torque converter hub. This can be checked converter hub. This can be checked by measuring the installed position by measuring the installed position of the torque converter (refer to the of the torque converter (refer to the Workshop Manual).

Note

Always make sure the mounting Always make sure the mounting bushings are installed correctly bushings are installed correctly between the engine and the between the engine and the transmission. Missing bushings will transmission. Missing bushings will result in irreparable damage to the result in irreparable damage to the roller bearing, the torque converter roller bearing, the torque converter hub, and the shaft oil seal due to an hub, and the shaft oil seal due to an offset between the engine and the offset between the engine and the transmission. transmission. 367_074 367_074 Converter Converter Housing

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ATF cooling is thermostat-controlled by means of ATF cooling is thermostat-controlled by means of anan oil-to-air heat exchanger (ATF cooler).

oil-to-air heat exchanger (ATF cooler). The ATF cooler isThe ATF cooler is mounted in front of the A/C condenser.

mounted in front of the A/C condenser.

ATF Cooling

367_012 367_012 ATF Cooler ATF Cooler Oil Temperature Oil Temperature Regulator Regulator (thermostat) (thermostat) ATF Cooler ATF Cooler Return Line Return Line ATF Cooler ATF Cooler Supply Line Supply Line Note Note

Please note that impurities

Please note that impurities in the ATF (forin the ATF (for example, abrasion, chips, emulsions) are example, abrasion, chips, emulsions) are distributed throughout the ATF cooling system distributed throughout the ATF cooling system and deposit here. The cooling system must, and deposit here. The cooling system must, therefore, be flushed thoroughly before repair therefore, be flushed thoroughly before repair or replacement. The lines must be disconnected or replacement. The lines must be disconnected from the thermostat and the cooler in order to from the thermostat and the cooler in order to flush out individual components.

ﬂush out individual components.

Make sure all contaminants are removed. If Make sure all contaminants are removed. If in doubt, components such as the ATF cooler in doubt, components such as the ATF cooler or thermostat must be replaced. Residual or thermostat must be replaced. Residual contaminants will lead to further damage of contaminants will lead to further damage of the transmission. Always follow the Workshop the transmission. Always follow the Workshop Manual instructions when servicing the ATF Manual instructions when servicing the ATF system.

system.

Oil Temperature Regulator (thermostat)

An expanding wax-type thermostat is used on the 09D An expanding wax-type thermostat is used on the 09D transmission. It is integrated with

transmission. It is integrated with the ATF cooler supplythe ATF cooler supply and return lines.

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16 16

Thermostat Closed

The expanding wax element acts as the thermostat The expanding wax element acts as the thermostat slide valve and regulates the ATF feed to

slide valve and regulates the ATF feed to the cooler.the cooler. In the closed state, a small fraction of the ATF ﬂows In the closed state, a small fraction of the ATF ﬂows through the bypass, thereby heating the expanding wax through the bypass, thereby heating the expanding wax element.

element.

At a temperature of approximately 167 °F (75 °C), the At a temperature of approximately 167 °F (75 °C), the plunger of the expanding wax element begins to press plunger of the expanding wax element begins to press downwards against the force of the spring, thereby downwards against the force of the spring, thereby opening the inlet to the cooler (see next ﬁgure). opening the inlet to the cooler (see next ﬁgure).

Plunger Plunger Seal Seal 367_014 367_014 G G G G K K K K 367_013 367_013 G = From or To Transmission G = From or To Transmission K = From or To Cooler K = From or To Cooler G G G G K K K K Note Note

If the cooling system has been opened If the cooling system has been opened during repairs (thereby draining the during repairs (thereby draining the ATF cooler), the ATF temperature must ATF cooler), the ATF temperature must be raised to at least 194 °F (90 °C) by be raised to at least 194 °F (90 °C) by performing a test drive in order to set performing a test drive in order to set the ATF level correctly. This ensures the ATF level correctly. This ensures the ATF cooler is ﬁlled. The ATF level the ATF cooler is ﬁlled. The ATF level must be set

must be set after the ATF has cooledafter the ATF has cooled to normal test temperature (refer to to normal test temperature (refer to Workshop Manual).

Note

Contaminants can clog the thermostat Contaminants can clog the thermostat bypass, thereby impairing the function bypass, thereby impairing the function of or disabling the thermostat.

of or disabling the thermostat. This can cause the transmission to This can cause the transmission to overheat! At an ambient temperature overheat! At an ambient temperature of 77 °F (25 °C) and during normal of 77 °F (25 °C) and during normal vehicle operation, the ATF temperature vehicle operation, the ATF temperature barely exceeds 230 °F (110 °C). barely exceeds 230 °F (110 °C). Expanding Expanding Wax Wax Element Element Bypass Bypass

Thermostat Open

At a temperature of approximately 194 F (90 C), the At a temperature of approximately 194 F (90 C), the thermostat is fully open.

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Planetary Gear Set

ATF Pump ATF Pump 367_073 367_073 Single Planetary Single Planetary Gear Set Gear Set

The 09D transmission is based on the Lepellet The 09D transmission is based on the Lepelletierier planetary gear set concept (six forward gears and one planetary gear set concept (six forward gears and one reverse gear).

reverse gear).

The Lepelletier planetary gear set is based on a single The Lepelletier planetary gear set is based on a single planetary gear set (primary planetary gear set) and a planetary gear set (primary planetary gear set) and a Ravigneaux planetary gear set (secondary planetar Ravigneaux planetary gear set (secondary planetary geary gear set) further down the drive train.

set) further down the drive train.

367_022

Sun Gear S1

Single Planetary Gear Set

(primary planetary gear set)

(primary planetary gear set) Freewheel FFreewheel F

Ravigneaux Planetary Gear Set

(secondary planetary gear set)

Tr

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18 18 Inner Plate Carrier

Inner Plate Carrier

Clutch K3 Clutch K3 Planet Carrier PT1 Planet Carrier PT1 Planetary Gears P1 Planetary Gears P1 Ring Gear H1 Ring Gear H1 Turbine Shaft Turbine Shaft 367_016 367_016 367_017 367_017

Large Sun Gear S2

Small Sun Gear S3

Planetary Gear P3

Inner Plate Carrier

Brake B2 Brake B2 Planet Carrier PT2 Planet Carrier PT2 Planetary Gear P2 Planetary Gear P2

Inner Plate Carrier

Clutch K2 Clutch K2 Ring Gear H2 Ring Gear H2 Ravigneaux Ravigneaux

Planetary Gear Set

The special feature of the Lepellet

The special feature of the Lepelletier planetary gearier planetary gear set is that the sun gears and the planet carrier of the set is that the sun gears and the planet carrier of the Ravigneaux gear set are driven at

Ravigneaux gear set are driven at different speeds. Thisdifferent speeds. This provides a large number of ratios.

provides a large number of ratios.

The sun gears of the Ravigneaux gear seat are driven at The sun gears of the Ravigneaux gear seat are driven at the reduced output speed of the single planetary gear the reduced output speed of the single planetary gear set. The planet carrier of the Ravigneaux

set. The planet carrier of the Ravigneaux gear seat isgear seat is driven at transmission input speed.

driven at transmission input speed.

A feature of the Lepelletier planetary gear set is that A feature of the Lepelletier planetary gear set is that only ﬁve shift elements are required for engaging all only ﬁve shift elements are required for engaging all sixsix forward gears and reverse gear.

forward gears and reverse gear.

Advantag

es of the Le

pelletier

Planetar

y

Gear Set Concept

–

– It allows a very compact design, despite a widerIt allows a very compact design, despite a wider ratio spread and more gear steps.

ratio spread and more gear steps. –

– It has much fewer It has much fewer components, signiﬁcantlycomponents, signiﬁcantly reducing weight and cost of manufacture. reducing weight and cost of manufacture. –

– The wide ratio spread, the closThe wide ratio spread, the closer ratios, and theer ratios, and the reduced number of gear shifting components reduced number of gear shifting components ensure a high level of

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Shift Elements

A continuous ﬂow of power and different ratios can be A continuous ﬂow of power and different ratios can be obtained in a planetary gear set by introducing torque obtained in a planetary gear set by introducing torque into a corresponding component (for example, on the into a corresponding component (for example, on the planet carrier) and by holding a different component planet carrier) and by holding a different component stationary (for example, the sun gear) or interconnecting stationary (for example, the sun gear) or interconnecting two components of a planetary gear set (for example, two components of a planetary gear set (for example, connecting the planet carrier to the sun gear). connecting the planet carrier to the sun gear).

367_018

Brake B1

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20 20 367_073 367_073 Freewheel F Freewheel F

Outer Plate Carrier of Clutch K2

(pulled back slightly to provide a

better view of K2)

367_019

Inner Plate Carrier,

Clutch K1

The shift elements (brakes and clutches), in combination The shift elements (brakes and clutches), in combination with the planetary gear sets, establish a ﬂow of power with the planetary gear sets, establish a ﬂow of power and execute gear shifts under load, without any and execute gear shifts under load, without any interruption in tractive power.

interruption in tractive power.

The following shift elements are used: The following shift elements are used: –

– Three Planetary Multi-plate Clutches (K1, K2, and K3)Three Planetary Multi-plate Clutches (K1, K2, and K3) –

– Two Fixed PTwo Fixed Plate Brakes (B1 and B2)late Brakes (B1 and B2) –

– One Freewheel One Freewheel (F)(F)

Clutches K1, K2, and K3 introduce engine torque into the Clutches K1, K2, and K3 introduce engine torque into the planetary gear set. All clutches have a

planetary gear set. All clutches have a dynamic pressuredynamic pressure compensation function, with the result that clutch compensation function, with the result that clutch response is independent of engine speed.

response is independent of engine speed. Brakes B1 and B2, or freewhee

Brakes B1 and B2, or freewheel F, establish a torquel F, establish a torque counter-point with the transmission housing. counter-point with the transmission housing. All clutches and brakes are activated indirectly by All clutches and brakes are activated indirectly by electronic pressure control valves.

electronic pressure control valves.

Freewheel F, which is also a shift element, is

Freewheel F, which is also a shift element, is arrangedarranged in parallel with brake B2. During automatic operation, in parallel with brake B2. During automatic operation, it takes over the function of brake B2. The freewheel it takes over the function of brake B2. The freewheel simpliﬁes electro-hydraulic shift control when selecting simpliﬁes electro-hydraulic shift control when selecting gears and when shifting up and down between 1st and gears and when shifting up and down between 1st and 2nd gear.

2nd gear. Brake B2

Brake B2 Clutch K2Clutch K2

367_020

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21 21

Overview of Planetary Gear Set/Shift Elements

367_022

Schematic Power Flow Diagram Schematic Power Flow Diagram

K3 K3 367_021 367_021 P1 P1 K1 K1 P3 P3 S2S2 S3S3 K2 K2 Lockup Clutch Lockup Clutch B1 B1 PT1 PT1 H1H1 S1S1 F F B2 B2 H2 H2 P2P2 PT2 PT2

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22 22

367_031

Primary Planetary Gear Set

Component:

Component: Connected Connected to:to: H1

H1 – – Ring Ring Gear Gear 1 1 Turbine Turbine Shaft Shaft (drive)/Clutch (drive)/Clutch K2K2 P1

P1 – – Planetary Planetary Gears Gears 1 1 Power Power TransmissTransmission ion in in Planetary Planetary Gear Gear SetSet S1

S1 – – Sun Sun Gear Gear 1 1 StationaryStationary PT1

PT1 – – Planet Planet Carrier Carrier 1 1 Clutches Clutches K1 K1 and and K3K3

Secondary Planetary Gear Set

Component:

Component: Connected Connected to:to: H2

H2 – – Ring Ring Gear Gear 2 2 OutputOutput P2

P2 – Planetary – Planetary Gears Gears 2, 2, Long Long Power Power TransmissTransmission ion in in Planetary Planetary Gear Gear SetSet P3

P3 – Planetary – Planetary Gears Gears 3, 3, Short Short Power Power TransmissTransmission ion in in Planetary Planetary Gear Gear SetSet S2

S2 – – Sun Sun Gear Gear 2, 2, Large Large Clutch Clutch K3/Brake K3/Brake B1B1 S3

S3 – – Sun Sun Gear Gear 3, 3, Small Small Clutch Clutch K1K1 PT2

PT2 – – Planet Planet Carrier Carrier 2 2 Clutch Clutch K2/Brake K2/Brake B2/Freewheel B2/Freewheel FF

Clutches, Brakes, Freewheel

Component: Task:

H2 –

H2 – Clutch Clutch 1 1 Planet Planet Carrier Carrier PT1 PT1 (primary (primary gear gear set) set) Connected Connected to to Small Small Sun Sun Gear Gear S3S3 (secondary gear set)

(secondary gear set) K2 –

K2 – Clutch Clutch 2 2 Turbine Turbine Shaft Shaft (input) (input) Connected Connected to to Planet Planet Carrier Carrier PT2 PT2 of of thethe Secondary Planetary Gear Set

Secondary Planetary Gear Set K3

K3 – – Clutch Clutch 3 3 Planet Planet Carrier Carrier PT1 PT1 (primary (primary gear gear set) set) Connected Connected to to Small Small Sun Sun Gear Gear S2S2 (secondary gear set)

(secondary gear set) B1

B1 – – Brake Brake 1 1 Holds Holds Large Large Sun Sun Gear Gear S2 S2 (secondary (secondary gear gear set) set) StationaryStationary B2

B2 – – Brake Brake 2 2 Holds Holds Planet Planet Carrier Carrier PT2 PT2 (secondary (secondary gear gear set) set) StationaryStationary F

F – – Freewheel Freewheel Holds Holds Planet Planet Carrier Carrier PT2 PT2 (secondary (secondary gear gear set) set) Stationary Stationary Counter Counter to to thethe Direction of Rotation of the

Direction of Rotation of the Drive and is Used when Drive and is Used when Driving Under ThrottleDriving Under Throttle in 1st Gear (no engine brake)

in 1st Gear (no engine brake)

Converter Lockup Clutch Converter Lockup Clutch

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23 23

Function of the Shift Elements

Clutches and Brakes Clutches and Brakes

The function of the shift elements is explained here The function of the shift elements is explained here using clutch K2, which is exemplary of clutches K1 and using clutch K2, which is exemplary of clutches K1 and K3, as well as brakes B1 and B2. Unlike the clutches, K3, as well as brakes B1 and B2. Unlike the clutches, the brakes require no dynamic pressure compensation, the brakes require no dynamic pressure compensation, because their clutch pistons and cylinders are because their clutch pistons and cylinders are non-rotating and therefore are not subject to a dynamic rotating and therefore are not subject to a dynamic increase in pressure.

increase in pressure.

The shift elements are actuate

The shift elements are actuated hydraulically. Pressured hydraulically. Pressure oil is supplied to the shift elements by the valve oil is supplied to the shift elements by the valve assembly through stationary and rotating ports in the assembly through stationary and rotating ports in the transmission housing, on the shafts, and on

transmission housing, on the shafts, and on otherother components. Lube oil is supplied to the bearings and the components. Lube oil is supplied to the bearings and the shift elements in the

shift elements in the same manner.same manner.

The clutch plate carriers are

The clutch plate carriers are perforated, allowing the ATFperforated, allowing the ATF to ﬂow through each clutch from the inside outwards to ﬂow through each clutch from the inside outwards (normally when the clutch is

(normally when the clutch is open). The design of theopen). The design of the lined plates and the centrifugal force are conducive to oil lined plates and the centrifugal force are conducive to oil ﬂow through the clutches.

ﬂow through the clutches.

Clutch K2 - Open Clutch K2 - Open 367_054 367_054 Inner Plate Inner Plate Carrier Carrier Tr

Transmission Shaft ansmission Shaft -

-Connected to the Connected to the Turbine Shaft Turbine Shaft Planet Carrier PT2 Planet Carrier PT2 Coil Spring Coil Spring Clutch Plates Clutch Plates

(steel plates and

lined plates) lined plates) Bafﬂe Plate Bafﬂe Plate Clutch Piston Clutch Piston

Outer Plate Carrier

Clutch Piston Cylinder

Pressure Compensation Pressure Compensation Chamber Chamber Output Shaft Output Shaft Transmission Transmission Housing Housing Pressure Port Pressure Port Clutch K2 Clutch K2 Clearance Clearance Lubricating Lubricating Oil Oil Oil Pressure Oil Pressure H Hiigghh 00

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24 24

In order to close the clutch, oil pressure is directed In order to close the clutch, oil pressure is directed into the clutch cylinder chamber. The clutch piston into the clutch cylinder chamber. The clutch piston compresses the clutch plate

compresses the clutch plate assembly, and the clutchassembly, and the clutch engages when the required oil pressure is reached. If engages when the required oil pressure is reached. If the clutch cylinder chamber is pressureless, the c the clutch cylinder chamber is pressureless, the clutchlutch piston is forced back into its initial position by spring piston is forced back into its initial position by spring pressure (in this case, by multiple

pressure (in this case, by multiple coil springs). Acoil springs). A clearance is maintained between the clutch piston and clearance is maintained between the clutch piston and the clutch plate assembly so friction can be minimized the clutch plate assembly so friction can be minimized when the clutch is open.

when the clutch is open.

In order to match transmission efﬁciency to the engine In order to match transmission efﬁciency to the engine as best possible, the number of clutch plates is adapted as best possible, the number of clutch plates is adapted to the engine power output. Drag losses of open to the engine power output. Drag losses of open clutches are thus kept to a minimum.

clutches are thus kept to a minimum.

Clutch K2 - Closed

367_084 367_084 Coil Spring Coil Spring Clutch Plates/ Clutch Plates/ Clutch Plate Clutch Plate Assembly

Assembly _{Clutch Piston}_{Clutch Piston}

Clutch Cylinder Clutch Cylinder Chamber Chamber Output Shaft Output Shaft Shift Pressure Shift Pressure Lubricating Lubricating Oil Oil Oil Pressure Oil Pressure H Hiigghh 00

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367_072 367_072 Oilway Oilway Clutch K2 Clutch K2 Baffle Plate Baffle Plate Clutch Piston Clutch Piston Clutch Cylinder Clutch Cylinder Chamber Chamber Pressure Compensation Pressure Compensation Chamber Chamber Transmission Transmission Housing Housing Shift Pressure Shift Pressure Lubricating Lubricating Oil Oil Oil Pressure Oil Pressure H Hiigghh 00 Baffle Plate Baffle Plate

At high engine speeds, due to rotation, the oil is subject At high engine speeds, due to rotation, the oil is subject to high centrifugal forces inside the clutch cylinder to high centrifugal forces inside the clutch cylinder chamber.

chamber.

This causes the pressure inside the

This causes the pressure inside the clutch cylinderclutch cylinder chamber to increase towards the largest radius. This chamber to increase towards the largest radius. This process is referred to as “dynamic pressure increase.” process is referred to as “dynamic pressure increase.” Dynamic pressure increase is best avoided because Dynamic pressure increase is best avoided because it unduly increases the surface pressure and makes it unduly increases the surface pressure and makes it more difﬁcult to control the increase and reduction it more difﬁcult to control the increase and reduction of pressure inside

of pressure inside the pressure chamber. To ensurethe pressure chamber. To ensure controlled closing and opening of the clutches, clutches controlled closing and opening of the clutches, clutches K1, K2, and K3 have a pressure compensation function. K1, K2, and K3 have a pressure compensation function.

It allows gearshifts to be

It allows gearshifts to be controlled precisely, and this,controlled precisely, and this, in turn, greatly enhances shift comfort. Leaks in the in turn, greatly enhances shift comfort. Leaks in the pressure equalization chamber can, at high engine pressure equalization chamber can, at high engine speeds, lead to uncontrolled frictional engagement of speeds, lead to uncontrolled frictional engagement of the clutch and damage it.

the clutch and damage it.

Dynamic Pressure Compensation in Clutches

Principle/Mode of Operation (example - K2)

The clutch pistons are swept by ATF on both sides. This The clutch pistons are swept by ATF on both sides. This is caused by means of a baffle plate. The baffle plate is caused by means of a baffle plate. The baffle plate creates a sealed space leading to the clutch piston. creates a sealed space leading to the clutch piston. This space is referred to as the pressure compensation This space is referred to as the pressure compensation chamber. The pressure compensation chamber is filled chamber. The pressure compensation chamber is filled

The A

The ATF in the pressure cTF in the pressure compensation chamber isompensation chamber is subjected to the same centrifugal forces (dynamic subjected to the same centrifugal forces (dynamic pressure increase) as the ATF in the clutch cylinder pressure increase) as the ATF in the clutch cylinder chamber. Thi

chamber. This compensates s compensates for the increase in for the increase in forceforce acting upon the clutch piston (due to dynamic pressure acting upon the clutch piston (due to dynamic pressure

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26 26

Freewheel

The freewheel transmits torque in one direction of The freewheel transmits torque in one direction of rotation only. No torque is transmitted in the

rotation only. No torque is transmitted in the oppositeopposite direction.

direction.

In the 09D transmission, the freewheel is used for In the 09D transmission, the freewheel is used for driving away in 1st gear. The freewheel holds planet driving away in 1st gear. The freewheel holds planet carrier PT2 stationary and thus a

carrier PT2 stationary and thus allows power to ﬂow.llows power to ﬂow.

Principle/Mode of Operation

The freewheel in the 09D

The freewheel in the 09D transmission is a spragtransmission is a sprag type freewheel. It consists of an outer ring (positively type freewheel. It consists of an outer ring (positively connected to the

connected to the transmission housing), an inner ringtransmission housing), an inner ring (positively connected to planet carrier PT2), and sprags (positively connected to planet carrier PT2), and sprags located between

located between the inner and outer rings. The spragsthe inner and outer rings. The sprags are asymmetrically shaped and accommodated in the are asymmetrically shaped and accommodated in the space between the inner and outer rings.

space between the inner and outer rings.

Direction of Rotation

In the direction of rotation of the planet carrier (inner In the direction of rotation of the planet carrier (inner ring), the sprags change their orientation without ring), the sprags change their orientation without creating any resistance, because of their shape. creating any resistance, because of their shape.

Locking Direction

In the locking direction of the planet carrier (inner ring), In the locking direction of the planet carrier (inner ring), the sprags stand up because of their shape, and ﬁll the sprags stand up because of their shape, and ﬁll the annular space between the inner and outer rings in the annular space between the inner and outer rings in such a way that the

such a way that the inner and outer rings are positivelyinner and outer rings are positively engaged. In this instance, the planet carrier is held engaged. In this instance, the planet carrier is held stationary, since the outer ring is positively connected stationary, since the outer ring is positively connected to the transmission housing.

to the transmission housing.

Note Note

Due to the freewheel, no engine braking Due to the freewheel, no engine braking effect is available in 1st gear during effect is available in 1st gear during normal automatic operation. normal automatic operation. If the freewheel is

If the freewheel is faulty, no power flowfaulty, no power flow will be possible in 1st gear during normal will be possible in 1st gear during normal automatic operation. In this case, a flow automatic operation. In this case, a flow of power can be achieved by selecting 1st of power can be achieved by selecting 1st gear using the Tiptronic function.

gear using the Tiptronic function.

367_110 367_110 Outer Ring Outer Ring (stationary) (stationary) Inner Ring Inner Ring Sprag “Free” Sprag “Free” Sprag “Locked” Sprag “Locked” 367_109 367_109 Inner Ring Inner Ring Planet Carrier PT2

Planet Carrier PT2 Outer RingOuter Ring

Sprag

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Hydraulic Control

Valv

e Assem

bly

The clutches and brakes (shift elements) are controlled The clutches and brakes (shift elements) are controlled by the valve assembly by means of

by the valve assembly by means of hydraulic shift controlhydraulic shift control valves (gate valves). The gate valves a

valves (gate valves). The gate valves are controlled byre controlled by electromagnetic valves, which, in turn, are activated by electromagnetic valves, which, in turn, are activated by Transmissio

Transmission Control Module n Control Module J217.J217.

In addition to the shift elements, the valve assembly In addition to the shift elements, the valve assembly controls the lockup clutch and the various pressures controls the lockup clutch and the various pressures throughout the transmission (for example, main throughout the transmission (for example, main pressure, control pressure, torque converter pressure, pressure, control pressure, torque converter pressure, lubricating pressure, etc.).

lubricating pressure, etc.). The valve assembly is largelyThe valve assembly is largely responsible for oil supply and

responsible for oil supply and therefore for propertherefore for proper functioning of the transmission.

functioning of the transmission.

The valve assembly consists of the following The valve assembly consists of the following components:

components: –

– Mechanically Actuated Selector Mechanically Actuated Selector ValveValve –

– Hydraulic Shift Control Hydraulic Shift Control ValvesValves –

– Two Electrically ControllTwo Electrically Controlled Shift Solenoidsed Shift Solenoids (3/2-way valves)

(3/2-way valves) –

– Six Electronic Pressure Control VSix Electronic Pressure Control Valves (modulatingalves (modulating valves)

valves) –

– ATF TATF Temperature Sensoremperature Sensor

367_067

G93

Tr

Transmission ansmission Oil Temperature SensorOil Temperature Sensor

Bottom View of Valve Assembly

Electronic Pressure Control Valves (EPCV)

Shift Solenoids Shift Solenoids OPEN-CLOSE Valves OPEN-CLOSE Valves Selector Selector Valve Valve N N9911 NN9933 NN9900 NN9922 NN228833 NN228822 NN8888 NN8899 To/From Transmission To/From Transmission Control Module J217 Control Module J217 Connection to Connection to Tr

Speed (RPM) Sensor G95 Speed (RPM) Sensor G95 Connection to Connection to Transmission Transmission Input Speed Input Speed (RPM) Sensor (RPM) Sensor G182 G182

Oil Intake Port

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28 28

Electromagnetic Valves

In the case of the electromagnetic valves, a distinction In the case of the electromagnetic valves, a distinction is made between shift solenoids with two switching is made between shift solenoids with two switching positions (OPEN - CLOSE) and electronic

positions (OPEN - CLOSE) and electronic pressure controlpressure control valves (known as EPCVs or modulating valves).

valves (known as EPCVs or modulating valves). The shift solenoids (N88/N89) are 3/2

The shift solenoids (N88/N89) are 3/2-way valves or-way valves or OPEN-CLOSE valves.

OPEN-CLOSE valves.

3/2 valve means the valves have three connections and 3/2 valve means the valves have three connections and two switching positions (open/closed or OPEN–CLOSE). two switching positions (open/closed or OPEN–CLOSE). These valves are used for switching hydraulic shift These valves are used for switching hydraulic shift control valves.

control valves.

The EPCVs convert an electrical current to a proportional, The EPCVs convert an electrical current to a proportional, hydraulic control pressure. This control pressure, in turn, hydraulic control pressure. This control pressure, in turn,

activates hydraulic shift control valves, which control activates hydraulic shift control valves, which control the “working pressure” of the shift elements (the lockup the “working pressure” of the shift elements (the lockup clutch and the master pressure).

clutch and the master pressure). Two types of EPCVs are used. Two types of EPCVs are used.

EPCVs with a rising characteristic increase pilot pressure EPCVs with a rising characteristic increase pilot pressure (P) as a function of rising control current (I) - no current (P) as a function of rising control current (I) - no current - zero pilot pressure (0 mA = 0 bar).

- zero pilot pressure (0 mA = 0 bar).

EPCVs with a falling characteristic reduce pilot pressure EPCVs with a falling characteristic reduce pilot pressure as a function of rising control current - no current as a function of rising control current - no current - maximum pilot pressure.

- maximum pilot pressure.

367_069

EPCV with Rising

Characteristic

EPCV with Falling

Characteristic Characteristic 367_070 367_070

Effects of Malfunctioning

If the self-diagnostics detect a faulty electromagnetic If the self-diagnostics detect a faulty electromagnetic valve, the limp-home mode is normally activated. valve, the limp-home mode is normally activated. Electrical and mechanical malfunctions have Electrical and mechanical malfunctions have very different effects due to the complexity of the very different effects due to the complexity of the electrohydraulic control system. The effects may be electrohydraulic control system. The effects may be conﬁned to the actual malfunctioning system (for conﬁned to the actual malfunctioning system (for example, in the case of N91, the lockup clutch), but they example, in the case of N91, the lockup clutch), but they can also cause the vehicle to enter limp-home mode if can also cause the vehicle to enter limp-home mode if safe operation is no longer assured.

safe operation is no longer assured.

Examples: Examples:

N93 controls the master pressure. If EPCV N93 fails, the N93 controls the master pressure. If EPCV N93 fails, the transmission will operate at maximum system pressure. transmission will operate at maximum system pressure. The effects are “clunky” shifting from “P” or “N” to “D/S” The effects are “clunky” shifting from “P” or “N” to “D/S” or “R” and during gearshifting in general.

or “R” and during gearshifting in general.

EPCV N91 controls the lockup clutch. If EPCV N91 fails, EPCV N91 controls the lockup clutch. If EPCV N91 fails, the lockup clutch cannot be activated and therefore the lockup clutch cannot be activated and therefore remains open. remains open. N88 N88 N N9911 NN9933 NN9900 NN9922 NN228833 NN228822 N88 N88 N89 N89 Shift Shift Solenoids Solenoids OPEN-CLOSE OPEN-CLOSE Valves Valves

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29 29

Function Assignments of the Function Assignments of the Electromagnetic Valves Electromagnetic Valves

N90

N90 Controls Controls Clutch Clutch K3K3 N91

N91 Controls Controls the the TTorque orque Converter Converter Lockup Lockup ClutchClutch N92

N93 Controls Controls the the Master Master Pressure/System Pressure/System PressurePressure N282

N283 Controls Controls Brake Brake B1B1

Solenoid valves N88 and N89 are used for controlling Solenoid valves N88 and N89 are used for controlling gearshifts from 4th to 6th gear and are activated gearshifts from 4th to 6th gear and are activated (energized) temporarily or alternately during gearshift (energized) temporarily or alternately during gearshift operations.

operations.

Solenoid valves N88 and N89 also control brake B2 in Solenoid valves N88 and N89 also control brake B2 in 1st gear - Tiptronic mode (for the engine

1st gear - Tiptronic mode (for the engine brake).brake).

Note Note

Function is inverse to electrical current Function is inverse to electrical current applied, since EPCVs N92, N93, N282, and applied, since EPCVs N92, N93, N282, and N283 have a

N283 have a falling characteristic. Thisfalling characteristic. This means a shift element is operated if the means a shift element is operated if the corresponding EPCV is not activated. corresponding EPCV is not activated.

Shift Logic

384_030 384_030 P P Solenoid Logic Solenoid Logic 3/2 Valves

3/2 Valves Electronic Pressure Control ValvesElectronic Pressure Control Valves

Gear Shifting Component Logic

Clutches, Brakes, Freewheel

N N Reverse (R) Gear Reverse (R) Gear First Gear First Gear Second Gear Second Gear Third Gear Third Gear Fourth Gear Fourth Gear Fifth Gear Fifth Gear Sixth Gear Sixth Gear T T TT T T//ZZ zz T T//ZZ zz T T//ZZ zz z z T T

Legend of Solenoid Valve Logic Legend of Solenoid Valve Logic

Solenoid

Solenoid Valve Valve is is Not Not ActivatedActivated

(current approximately 100 mA) or Shift (current approximately 100 mA) or Shift Element Open

Element Open Solenoid

Solenoid Valve Valve is is ActivatedActivated (solenoid valve open) (solenoid valve open) Solenoid

Solenoid Valve Valve is is ActivatedActivated (current approximately 1.0 A) (current approximately 1.0 A) Corresponding

Corresponding Clutch Clutch ClosedClosed Corresponding

Corresponding Brake Brake ClosedClosed Freewheel

Freewheel LockedLocked The

The Current Current Applied Applied to to the the Solenoid Solenoid ValveValve Differs Depending on its Operating State Differs Depending on its Operating State T

T – – Tiptronic Tiptronic ModeMode

(1st gear with engine brake) (1st gear with engine brake) Z

Z – – Solenoid Solenoid Valves Valves are are Activated Activated OnlyOnly T

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30 30

Description of

Description of Gear/T

Gear/T

orque Curve

1st Gear i = 4.148

(i = Gear Ratio)

367_023 367_023

Shift Elements: Clutch K1 - Freewheel F

The turbine shaft drives ring gear H1

The turbine shaft drives ring gear H1 of the primaryof the primary planetary gear set. Ring gear H1 drives planetary gears planetary gear set. Ring gear H1 drives planetary gears P1, which revolve around stationary sun

P1, which revolve around stationary sun gear S1.gear S1. Planet carrier PT1 is driven in

Planet carrier PT1 is driven in this way. Clutch K1this way. Clutch K1 connects PT1 to sun gear S3 and introduces torque into connects PT1 to sun gear S3 and introduces torque into the secondary planetary gear set.

the secondary planetary gear set. Freewheel F locks planet

Freewheel F locks planet carrier PT2. Torque iscarrier PT2. Torque is

transmitted from sun gear S3 to short planetary gears P3 transmitted from sun gear S3 to short planetary gears P3 and, in turn, to long planetary gears P2.

and, in turn, to long planetary gears P2.

The torque multiplied by PT2 is transmitted

The torque multiplied by PT2 is transmitted to ring gearto ring gear H2, which is connected to the transmission output shaft. H2, which is connected to the transmission output shaft. Since 1st gear is implemented

Since 1st gear is implemented via freewheel F, no powervia freewheel F, no power is transmitted when coasting in 1

is transmitted when coasting in 1st gear. When coasting,st gear. When coasting, the wheels drive the engine. Freewheel F rotates counter the wheels drive the engine. Freewheel F rotates counter to its locking direction (in the freewheeling direction), to its locking direction (in the freewheeling direction), with the result that the engine braking effect cannot be with the result that the engine braking effect cannot be used.

used. T

To be able to o be able to utilize the engine braking effect utilize the engine braking effect in 1st gear,in 1st gear, Tiptronic mode must be selected.

Tiptronic mode must be selected.

Torq

Torque ue Curve/Power Curve/Power FlowFlow Parts

Parts are are StationaryStationary or are Held Stationary or are Held Stationary Parts

Parts Rotate Rotate without without beingbeing Involved in the Flow of Involved in the Flow of PowerPower

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367_024

1st Gear in Tiptronic Mode

(with engine braking effect)

The engine braking effect will be ut

The engine braking effect will be utilized in 1st gearilized in 1st gear under special driving situations - for example, on steep under special driving situations - for example, on steep downhill gradients - by selecting 1st

downhill gradients - by selecting 1st gear in Tiptronicgear in Tiptronic mode (B2 closed).

mode (B2 closed).

The engine braking effect will only be ut

The engine braking effect will only be utilized in 1st gearilized in 1st gear by closing brake B2. Brake B2 locks planet

by closing brake B2. Brake B2 locks planet carrier PT2 likecarrier PT2 like freewheel F. Unlike F, however, B2 holds PT2

freewheel F. Unlike F, however, B2 holds PT2 stationary instationary in both directions of rotation. This is necessary in order to both directions of rotation. This is necessary in order to engage reverse and utilize the engine braking effect in engage reverse and utilize the engine braking effect in 1st gear.

1st gear.

Shift Elements: Clutch K1 - Brake B2

367_025

2nd Gear i = 2.370

The turbine shaft drives ring gear H1 of the primaryof the primary planetary gear set. Ring gear H1 drives planetary gears planetary gear set. Ring gear H1 drives planetary gears P1, which revolve around stationary sun

P1, which revolve around stationary sun gear S1.gear S1. Planet carrier PT1 is driven

Planet carrier PT1 is driven in this way. Clutch K1in this way. Clutch K1 connects PT1 to sun gear S3 and introduces torque into connects PT1 to sun gear S3 and introduces torque into the secondary planetary gear set.

the secondary planetary gear set.

Brake B1 locks large sun ge

Brake B1 locks large sun gear S2 in place. Torque isar S2 in place. Torque is transmitted from sun gear S3 to short planetary gears P3 transmitted from sun gear S3 to short planetary gears P3 and, in turn, long planetary gears P2.

and, in turn, long planetary gears P2. Long planetary gears P2 roll

Long planetary gears P2 roll around stationary sun geararound stationary sun gear S2 and drive ring gear H2, which is connected to the S2 and drive ring gear H2, which is connected to the transmission output shaft.

transmission output shaft.

Shift Elements: Clutch K1 - Brake B1

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32 32 367_026 367_026

3rd Gear i = 1.556

The turbine shaft drives ring gear H1 of the primaryof the primary planetary gear set. Ring gear H1 drives planetary gears planetary gear set. Ring gear H1 drives planetary gears P1, which revolve around stationary sun gear S1. Planet P1, which revolve around stationary sun gear S1. Planet carrier PT1 is driven in this w

carrier PT1 is driven in this way.ay.

Clutch K1 connects PT1 to sun gear S3 and introduces Clutch K1 connects PT1 to sun gear S3 and introduces torque into the secondary planetary gear set. Clutch K3 torque into the secondary planetary gear set. Clutch K3 likewise introduces torque into the secondary planetary likewise introduces torque into the secondary planetary gear set driving sun gear S2. The secondary planetary gear set driving sun gear S2. The secondary planetary gear set is locked when clut

gear set is locked when clutches K1 and K3 cches K1 and K3 close. Torqlose. Torqueue is now transmitted directly from the primary planetary is now transmitted directly from the primary planetary gear set to the transmission output shaft.

gear set to the transmission output shaft.

Shift Elements: Clutch K1 - Clutch K3

367_027

4th Gear i = 1.155

The turbine shaft drives ring gear H1 of the primaryof the primary planetary gear set and the outer plate carrier of clutch planetary gear set and the outer plate carrier of clutch K2.

K2.

Ring gear H1 drives planetary gears

Ring gear H1 drives planetary gears P1, which revolveP1, which revolve around stationary sun gear S1. Planet carrier PT1 is around stationary sun gear S1. Planet carrier PT1 is driven in this

driven in this way.way.

Clutch K1 connects PT1 to sun gear S3 and introduces Clutch K1 connects PT1 to sun gear S3 and introduces torque into the secondary planetary gear set.

torque into the secondary planetary gear set.

Clutch K2 connects the turbine shaft to planet carrier Clutch K2 connects the turbine shaft to planet carrier PT2, and likewise introduces torque into the secondary PT2, and likewise introduces torque into the secondary planetary gear set.

planetary gear set.

Long planetary gears P2, which mesh with short Long planetary gears P2, which mesh with short planetary gears P3, together with planet carrier planetary gears P3, together with planet carrier PT2, drive ring gear H2, which is connected to the PT2, drive ring gear H2, which is connected to the transmission output shaft.

transmission output shaft.

Shift Elements: Clutch K1 - Clutch K2