400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 2002-01-1253 Automatic Transmi ssion Control System Developed for Toyota Mild Hybrid System (THS-M) Hideo Tomomatsu, Yoshikazu Tanaka, Katsumi Nakatani, Tadasu Tomohiro and Tooru Matsubara Toyota Motor Corp. Eiji Miyachi Aisin Seiki Co.,Ltd. Kiyotomo Miura 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, Wednesday, August 01, 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, Wednesday, August 01, 20182002-01-1253 Automatic Transmission Control System Developed for Toyota Mild Hybrid System (THS-M) Hideo Tomomatsu,Yoshikazu Tanaka, Katsumi Nakatani, Tadasu Tomohiro and Tooru Matsubara Toyota Motor Corp. Eiji Miyachi Aisin Seiki Co.,Ltd Kiyotomo Miura Aisin AW Co.,Ltd. Copyright © 2002 Society of Automotive Engineers, Inc. ABSTRACT Environmental improvement is moving forward, due in part to the reduction of fuel consumption of automatic transmission(AT) vehicles as a result of social requirements in recent years and many measures have been implemented. Adoption of idling stop is a typical example introduced to reduce energy consumption while the vehicle is stopped to improve the urban environment. However, there are problems such as responsiveness and smoothness for an AT vehicle when the engine is stopped with the shift selector in “D” range. To overcome these problems, a new start clutch control system has been developed using an electric oil pump installed in a simple hybrid vehicle called a mild hybrid. As a result, a smooth feeling starting performance is achieved by operating the system in combination with the engine and other systems. Additionally, low fuel consumption and a smooth driving feeling are achieved by expanding the regenerative braking area upon deceleration by ensuring optim um harmony of the lock-up clutch with the engine and electrical systems. This