400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 Web: www.sae.org SAE TECHNICAL PAPER SERIES 2006-01-1487 Control System Development with Large Flow Small Linear Solenoid for the New Toyota FWD 6-Speed Transaxle Koji Oshima, Hiromichi Kimura, Hideki Miyata and Syogo Matsumoto Toyota Motor Corp . Reprinted From: Tran smission and Driveline 2006 (SP-2001) 2006 SAE World Congress Detroit, Michigan April 3-6, 2006 Downloaded from SAE International by Univ of California Berkeley, Thursday, August 02, 2018The Engineering Meetings Board has approved this paper for publication. It has successfully completed SAE's peer review process under th e supervision of the session organi zer. This process requires a minimum of three (3) reviews by industry experts. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. For permission and licensing requests contact: SAE Permissions 400 Commonwealth DriveWarrendale, PA 15096-0001-USAEmail: permissions@sae.orgTel: 724-772-4028 Fax: 724-776-3036 For multiple print copies contact: SAE Customer Service Tel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-0790Email: CustomerService@sae.org ISSN 0148-7191 Copyright © 2006 SAE International Positions and opinions advanced in this paper are those of the author(s ) and not necessarily those of SAE. The author is solely responsible for the content of th e paper. A process is available by which discussions will be printed with the pap er if it is publishe d in SAE Transactions. Persons wishing to submit papers to be considered for presentation or publicat ion by SAE should send the manuscript or a 300 word abstract to Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by Univ of California Berkeley, Thursday, August 02, 2018ABSTRACT Toyota Motor Corporation has developed a new 6-speed automatic transmission (U660E) for the front-wheel drive vehicles and large displacement engines. The U660 E was adapted to achieve improved environmental protection, and meet safety standards, which are large concerns for the society and customer satisfaction, by being small, light, highly efficient, quick response, and high shift quality. Toyota fundamentally improved both the hardware and software of the control system to meet these important goals. INTRODUCTION Global warming coupled with the sudden rise in crude oil prices and crude oil resources are of growing concern. A trend among automobile manufacturers has been to improve fuel economy, addressing concerns with crude oil resources. The movement among each automotive manufacturer has developed multi-speed automatic transmissions and continues to make advances in technology. Toyota Motor Corporation developed a six- speed automatic transaxle for front-wheel drive vehicles. Even with severe space limitations, Toyota achieved not only fuel economy improvement, but also good drivability for luxury vehicles. Furthermore, a new production system improved the initial quality. This paper describes the control system in the 6-speed automatic transaxle. DEVELOPMENT OBJECTIVES The development objectives of the control system for the 6-speed automatic transaxle are as follows: 1. Developed small hydraulic control device (valve body) to achieve world top-level. 2. Achieve quick response and high quality shift characteristics. 3. Improved fuel economy 4. Improved initial quality Table 1: Technical Data of the U660E Table 2: Operation Chart of Friction Elements O.W.C. C1 C2 B1 B2 B3 F1 1st 2nd 3rd 4th 5th 6th Rev ( : Engaged :Engaged for L range )Clutch BrakeGearTorque Converter 1st 3.300 2nd 1.900 3rd 1.420 4th 1.000 5th 0.713 6th 0.608 Rev 4.148 Total