400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 Web: www.sae.orgSAE TECHNICAL PAPER SERIES 2004-01-1638 Electro-Hydraulic Control System for AISIN AW New 6-Speed Automatic Transmission Hiroshi Tsutsui, Takayuki Hisano, Akitomo Suzuki, Makoto Hijikata and Masatoshi Taguchi Aisin AW Co., Ltd. Koichi Kojima AWTC Europe s.a. Wolfsburg Office Reprinted From: Transmission & Driveline Symposium 2004 (SP-1817) 2004 SAE World Congress Detroit, Michigan March 8-11, 2004Downloaded from SAE International by University of British Columbia, Thursday, August 02, 2018All 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: [email protected]: 724-772-4891Tel: 724-772-4028 For multiple print copies contact: SAE Customer Service Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA)Fax: 724-776-1615Email: [email protected] ISBN 0-7680-1319-4Copyright © 2004 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 the paper. A process is available by which discussionswill be printed with the paper if it is published in SAE Transactions. Persons wishing to submit papers to be considered for presentation or publication by SAE should send the manuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by University of British Columbia, Thursday, August 02, 20182004-01-1638 Electro-Hydraulic Control System for AISIN AW New 6-Speed Automatic Transmission Hiroshi Tsutsui, Takayuki Hisano, Akitomo Suzuki, Makoto Hijikata and Masatoshi Taguchi Aisin AW Co., Ltd. Koichi Kojima AWTC Europe s.a. Wolfsburg Office Copyright © 2004 SAE International ABSTRACT Recently, 5-speed automatic transmissions have become mainstream through the world, and 6-speed automatic transmissions have also been introduced in the market. Consequently, the issue of shift control is gaining importance, and a trend toward increasing number of gears in automatic transmissions has become apparent. On the other hand, weight saving and downsizing of the transmission, including the hydraulic control unit, are strongly required in order to promote fuel efficiency. To meet these requirements, an electro-hydraulic control unit offering sophisticated functionality desired in order to provide excellent shift quality. As an answer to these requirements AISIN AW developed two types of new 6-speed automatic transmissions in 2002: “TR-60SN” for RWD vehicles and “TF-60SN” for FWD vehicles. Both TR-60SN and TF- 60SN have the same structural characteristics . For the control strategy of these new automatic transmissions, an advanced electro-hydraulic control system has been developed that can ensure both one-step shifting and skip shifting by making use of the characteristics of this unique gear train structure. Flexible shifting can be realized by controlling each clutch pressure by the respective linear solenoids, in combination with use of the electric control unit. Additionally, Lock-up control and Neutral control is incorporated in the system to improve fuel efficiency. INTRODUCTION AISIN AW developed a 5-speed automatic transmission “55-50SN” in 1998(1)* in order to respond to the high expectations in the worldwide market for fuel efficiency and drivability improvement of automatic transmissions. Furthermore, 6-speed automatic transmissions, TF-60SN and TR-60SN, have been developed to offer enhanced capacity above that of the existing 5-speed automatic transmissions.