2011 A8 Power Transmission

  • View
    356

  • Download
    22

Embed Size (px)

Text of 2011 A8 Power Transmission

Self-Study Program 950103

The 2011 Audi A8 Power Transmission

Audi of America, LLC Service Training Printed in U.S.A. Printed 4/2010 Course Number 950103

2010 Audi of America, LLC

All rights reserved. Information contained in this manual is based on the latest information available at the time of printing and is subject to the copyright and other intellectual property rights of Audi of America, LLC., its afliated companies and its licensors. All rights are reserved to make changes at any time without notice. No part of this document may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, nor may these materials be modied or reposted to other sites without the prior expressed written permission of the publisher.

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

Always check Technical Bulletins and the latest electronic service repair literature for information that may supersede any information included in this booklet.

Table of Contents

Power Transmissions at a Glance . . . . . . . . . . . . . . . . . . . . 2 Eight-Speed Automatic Transmission OBK . . . . . . . . . . . . 4Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Special Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Splined Propeller Shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Center Differential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Torque Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Automatic Transmission Fluid (ATF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Planetary Gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Shift Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Brakes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Clutches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Shift Schematic and Shift Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Description of Power Flow Torque Characteristic Schematics . . . . . . . . . 13 Sectional View of OBK Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Oil System, Lubrication, and Sealing of the OBK Transmission . . . . . . . . . . . 18 Innovative Thermal Management (ITM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Transmission Heating and Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Mechatronic Electro-Hydraulic Control System . . . . . . . . . . . . . . . . . . . . . . . . 22 Pressure Regulating Valves and Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . 24 Hydraulic Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Transmission Control Module J217 Temperature Monitoring . . . . . . . . . . . . 27 Mechatronic Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Parking Lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Neutral Idle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Transmission Adaptation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Displays and Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Special Features of Adaptive Cruise Control (ACC) Mode . . . . . . . . . . . . . . . 36 Encoding Transmission Control Module J217 . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Adapting the Gear Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Limp-Home and Substitute Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

i

Table of Contents

Shift-by-Wire Control System . . . . . . . . . . . . . . . . . . . . . . .37Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Tiptronic Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 Shift Control System Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Shift Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Selector Lever Sensor System Control Module J587 . . . . . . . . . . . . . . . . . . . 43 Selector Lever Position Sensor G727 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 Functions, Networking and Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Selector Lever Release Button E681 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Selector Lever Transmission Range Position Display Unit Y26 . . . . . . . . . . . 45 Selector Lever E313 Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Gearshift Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Automatic Parking Lock (Auto P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Parking Lock Emergency Release Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Rear Axle Drive OBC and OBF . . . . . . . . . . . . . . . . . . . . . . .52Conventional Rear Axle Drive and Sport Differential . . . . . . . . . . . . . . . . . . . 52 Intelligent Torque Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Self-Study Programs for the 2011 Audi A8 . . . . . . . . . . .54 Knowledge Assessment . . . . . . . . . . . . . . . . . . . . . . . . . . .55

The Self-Study Program provides introductory information regarding the design and function of new models, automotive components or technologies. The Self-Study Program is not a Repair Manual! All values given are intended as a guideline only. Refer to the software version valid at the time of publication of the SSP. For maintenance and repair work, always refer to the current technical literature.ii

Reference

Note

!

1

2011 Audi A8 Power Transmissions at a Glancequattro Drive The Audi quattro permanent all-wheel drive system continues to give the Audi A8 a signicant edge on the competition. It provides reliable traction, stability, and dynamic handling in all weather conditions. The quattro mechanical center differential is at the heart of the drivetrain, distributing robust power to both axles depending upon the situation. With asymmetrical/dynamic standard distribution, 60% power ows to the rear differential and 40% to the front differential, delivering a sports car characteristic to the entire Audi A8 driving experience. The mechanical center differential senses torque. Then it instantly and automatically transfers most of the engine power to the axle with the better traction. Up to 80% power can be directed to the rear wheels, and up to 60% to the front wheels. The drive shaft is connected to the center differential by a lighter weight universal joint (also called a Cardan joint or U-joint). A clamped connection instead of a conventional anged joint, this provides a weight savings of 2.87 lb (1.3 kilograms), while also delivering smoother torque and higher rigidity. An auxiliary drive shaft runs from the front end of the center differential and along the right side of the eight-speed Tiptronic to the front differential. It is inclined slightly and features a very sophisticated system of teeth. Rear Axle Drive Two conventional rear differentials are offered on the 2011 Audi A8. The optional OBF sport differential is a high-performance rear differential. A superposition gear with two sun gears and an internal gear is mounted on the left and right sides of a conventional rear differential. When engaged, it turns 10% faster than the drive shaft.

2

457_001

Eight-Speed Tiptronic Transmission This eight-speed, torque converter-equipped transmission is a design based on the earlier six-speed transmissions designed by ZF. Its key strength lies in the high overall spread of 7.0:1 between the shortest and longest gear ratio. The Audi A8 has great acceleration from a standing stop, and because of its efciency, has great fuel economy in the two highest gears. Because the 2011 Audi A8 will initially be offered with only the 4.2L V8 FSI engine, the only transmission used will be the eight-speed OBK version. Another version, known as the OBL will become available as other engine options are made available in North America. This Self-Study Program will only cover the design of the OBK transmission. The OBK transmission features a new shift by wire control system which eliminates direct linkages to the

Recommended

View more >