400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-0790 Web: www.sae.org SAE TECHNICAL PAPER SERIES 2008-01-0535 Development of New Sports Shift Control System for Toyota's Automatic Transmission Nobufusa Kobayashi, Takaaki Tokura, Kazuyuki Shiiba, Toshihiro Fukumasu and Tomohiro Asami Toyota Motor Corp. Atsushi Yoshimura Aisin AW Co., Ltd. Reprinted From: Transm ission and Driveline, 2008 (SP-2147) 2008 World Congress Detroit, Michigan April 14-17, 2008 Downloaded from SAE International by Univ of Nottingham - Kings Meadow Campus, Saturday, August 11, 2018By mandate of the Engin eering Meetings Board, th is paper has been approved for SAE publication upon completion of a peer review process by a minimum of three (3) industry experts under the supervision of the session organizer. 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: [email protected]: 724-772-4028Fax: 724-776-3036 For multiple print copies contact: SAE Customer ServiceTel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-0790Email: Customer [email protected] ISSN 0148-7191Copyright © 2008 SAE InternationalPositions 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 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 publication by SAE should send themanuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by Univ of Nottingham - Kings Meadow Campus, Saturday, August 11, 20182008-01-0535 Development of New Sports Shift Control System for Toyota's Automatic Transmission Nobufusa Kobayashi, Takaaki Tokura, Kazuyuki Shiiba, Toshihiro Fukumasu and Tomohiro Asami Toyota Motor Corp. Atsushi Yoshimura Aisin AW Co., Ltd. Copyright © 2008 SAE International ABSTRACT Toyota has developed a new sports shift control system introduced in the world’s first eight-speed automatic transmission (AA80E), which is implemented in the “LS 460” and has been adopted in the “IS F” (upcoming 2008 model). This enables the IS F to be a vehicle that also permits the enjoyment of driving on circuits as well as achieving that “fun-to-drive” image. In sports driving, as ac hieved by the conventional torque converter-type autom atic transmissions, shift response performance for shift operation and linearity performance for accelerator operations were challenges to tackle. On the contra ry, the newly developed sports shift control system has resolved these challenges and enables the IS F to be capable of responding to a driver’s intention quickly and accurately, letting the driver truly experience satisfaction. This paper describes a general outline of the new sports shift control system that has significantly contributed to improvements in the IS F product appeal and introduces the effects of the overall technical system. INTRODUCTION Recently, in the environment, with global warming and energy concerns, the development of vehicles with low- fuel consumption and clean emissions is a must for automotive manufacturers. On the contrary, in the premium vehicle market, high power performance and high-speed performance are major factors that add to the appeal of the products. Moreover, high-powered engines are progressing. Thus, technologies capable of combining these contradicting performances are desired. In the IS F development, the first sport