SA E TECHNICAL PAPER SERIES Toyota Five-Speed Automatic Transmission with Application of Modern Control Theory Yasuo Hojo, Kunihiro Iwatsuki, and Hidehiro Oba Toyota Motor Corp. Kazunori lshikawa Aisin AW Co., Ltd. Reprinted from: Transmission and Driveline Symposium: Components, Gears, and CAE (SP-905) The Engineering Society 'International Congress & Exposition ** =For Advancing Mobility C and sea Air and Space@ Detroit, Michigan INTERNATIONAL February 24-28,1992 - 400 COMMONWEALTH DRIVE, WARRENDALE, PA 15096-0001 U.S.A. Downloaded from SAE International by University of Michigan, Tuesday, September 18, 2018The appearance of the 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. Thisconsent isgiven on thecondition, however, that the copier pay a$5.00 per article copy fee through the Copyright Clearance Center, Inc. Operations Center, 27 Congress St., Salem, MA 01970 for copying beyond that permitted by Sections 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such as copying for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. SAE routinely stocks printed papers for a period of three years following date of publication. Direct your orders to SAE Customer Service Department. To obtain quantity reprint rates, permission to reprint a technical paper or permission to use copyrighted SAE publications in other works, contact the SAE Publications Group. All SAE papers, standards, and selected books are abstracted and indexed in the SAE Global Mobility Database. No part of this publication may by reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. ISSN 0148-7191 Copyright 1992 Society of Automotive Engineers, Inc. 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 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 Division. Persons wishing to submit papers to be considered for presentation or publication through SAE should send the manuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Activity Board, SAE. Printed in USA Downloaded from SAE International by University of Michigan, Tuesday, September 18, 2018Toyota Five-Speed Automatic Transmission with Application of Modern Control Theory Yasuo Hojo, Kunihiro Iwatsuki, and Hidehiro Oba Toyota Motor Corp. Kazunori lshikawa Aisin AW Co., Ltd. ABSTRACT A compact and high-performance five-speed automatic transmission(A350E) has been developed for passenger cars. The development of this transmission has been aimed at improvement in acceleration performance in the low and medium speed range and at smooth acceleration. A five- speed automatic transmission with a simple gear train has been completed by means of the industry's first modern control theory aided shifting technique. IN RECENT YEARS, smooth acceleration, and improvement in fuel economy and in power performance have become a requirement for any new automatic transmission design. Therefore, an automatic transmission with a wide range of gearing and close gear ratios are needed. A five-speed automatic transmission meets such a need. It is necessary to minimize the weight increase and size increase of the transmission, due to the needs of the vehicle(e.g. improvement in fuel economy, and minimizing the required space etc.). As a result of studies, a five-speed automatic transmission with the same gear train as the conventional four-speed automatic transmission (A340E) was designed. This