The Engineering Society =For AdvanCing Mobility and Sea Air and Space, INTERNATIONAL^ 400 COMMONWEALTH DRIVE, WARRENDALE, PA 15096-0001 U.S.A. Toyota " ECT-i" a New Automatic Transmission with Intelligent Electronic Control System Tadashi Kondo, Kunihiro lwatsuki and Yutaka Taga Toyota Motor Corporation Takao Tanguchi and Takuji Taniguchi Aisin AW Co., Ltd. International Congress and Exposition Detroit, Michigan February 26 - March 2,1990 Downloaded from SAE International by University of Birmingham, Monday, August 20, 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. This consent is given on the condition, 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 01 970for copying beyond that permitted by Sections 107or 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. SAE GLOBAL MOBILITY DATABASE No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior writ- ten permission of the publisher. ISSN 01 48-71 91 Copyright 1990 Society of Automotive Engineers, Inc. Positions and opinions advanced in this paper are those of the Persons wishing to submit papers to be considered for presen- author(s)and not necessarily thoseof SAE. Theauthor issolely tation or publication through SAE should send the manuscript responsible for the content of the paper. A process is available or a 300 word abstract of a proposed manuscriptto: Secretary, by which discussions will be printed with the paper if it is Engineering Activity Board, SAE. published in SAE Transactions. For permission to publish this paper in full or in part, contact the SAE Publications Division. Printed In USA Downloaded from SAE International by University of Birmingham, Monday, August 20, 2018Toyota "ECT-i" a New Automatic Transmission with Intelligent Electronic Control System Tadashi Koncb, Kunihiro lwatsuki and Yutaka Taga Toyota Motor Corporation Takao Tanguchi and Takuji Taniguchi Aisin AW Co.. Ltd. ABSTRACT TOYOTA has developed a new automatic transmission, called the A341E. This transmission employs a unique engine and transmission integrated intelligent control system named 'ECT-in, and a high performance "Super Flown Torque Converter. This control system is capable of total control of engine torque and clutch hydraulic pressure during shifting, which has resulted in very smooth shift without changes over the life of the transmission. The "Super Flow" Torque Converter has a modified geometry optimized by the analysis of internal flow by means of computer simulations, attaining the highest efficiecy in the world. With the use of such systems, this new automatic transmission has improved total performance of the vehicle. IN RECENT YEARS since the oil crisis, technological developments for automatic transmissions have been aimed mainly at the improvement of fuel economy, with emphasis placed on increasing the efficiency of the complete power transmission system, including the engine. The four-speed automatic transmission, the lock-up clutch and their electronic controls have been developed and put into practical applications.(l)(2)(3) ' Currently, efforts are being made to increase the number of transmission speeds for furth