400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 2002-01-0936 Toyota’s New Five-Speed Automatic Transaxle U150E for FWD Passenger Cars Yasuhiro Kawai, Koichi Tanaka, Yoshihiro Iijima and Hiromichi Kimura Toyota Motor Corp. Naoyuki Fukaya and Mikio Iwase Aisin AW Co.,Ltd. Reprinted From: Transmission and Driveline Systems Symposium 2002 (SP–1655) SAE 2002 World Congress Detroit, Michigan March 4-7, 2002Downloaded from SAE International by University of British Columbia, Monday, July 30, 2018The appearance of this ISSN code at the bottom of this page indicates SAE’s consent that copies of the paper may be made for personal or internal use of specific clients. This consent is given on the condition,however, that the copier pay a per article copy fee through the Copyright Clearance Center, Inc. OperationsCenter, 222 Rosewood Drive, Danvers, MA 01923 for copying beyond that permitted by Sections 107 or108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such as copying forgeneral distribution, for advertising or promotional purposes, for creating new collective works, or forresale. Quantity reprint rates can be obtained from the Customer Sales and Satisfaction Department.To request permission to reprint a technical paper or permission to use copyrighted SAE publications in other works, contact the SAE Publications Group. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior wr itten permission of the publisher. ISSN 0148-7191 Copyright © 2002 Society of Automotive Engineers, Inc. Positions and opinions advanced in this paper are those of the aut hor(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 paper if it is published in SAE Transactions. For permission to publish this paper in full or in part, contact the SAE Publications Group.Persons wishing to submit papers to be consi dered for presentation or publication through SAE should send the manuscript or a 3 00 word abstract of a proposed manuscript to: Se cretary, Engineering M eetings Board, SAE. Printed in USAAll SAE papers, standards, and selected books are abstracted and indexed in the Global Mobility DatabaseDownloaded from SAE International by University of British Columbia, Monday, July 30, 20182002-01-0936 Toyota’s New Five-Speed Automatic Transaxle U150E for FWD Passenger Cars Yasuhiro Kawai, Koichi Tanaka, Yoshihiro Iijima and Hiromichi Kimura Toyota Motor Corp. Naoyuki Fukaya and Mikio Iwase Aisin AW Co.,Ltd. Copyright © 2002 Society of Automotive Engineers, Inc. ABSTRACT A new five-speed automatic transaxle, U150E, has been developed for FWD passenger cars. The goals of the development of this transaxle are fuel economy improvement, better acceleration performance, and a smoother shift feel. U150E achieved its targets by adopting a wide gearing range and using hydraulic control system design based on various simulations. This paper describes the major features, performance of this automatic transaxle, and technical points of the development. INTRODUCTION In recent years, the fuel economy of automobiles is becoming more important because of concerns of environmental issues, such as the depletion of fossil fuel and global warming. In fact, the regulation for reducing the amount of carbon dioxi de emissions is becoming more severe, especially in Europe. Due to this, various technologies reducing fuel consumption are introduced to automatic transaxles to make them lighter, more compact, more efficient etc. In addition, acceleration performance and smooth shift feel are also very important for automatic transaxles. To realize these objectives, the new five-speed automatic transaxle, U150E, has been developed for FWD passenger cars. DEVELOPMENT OBJECTIVES