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 2007-01-1306 Toyota’s New Integrated Drive Power Control System Seiji Kuwahara, Hideki Ku bonoya, Hiroshi Mizuno, Masato Kaigawa and Katsumi Kono Toyota Motor Corp. Reprinted From: Tr ansmissions & Drivelines (SP-2134) 2007 World Congress Detroit, Michigan April 16-19, 2007 Downloaded from SAE International by Univ of Nottingham - Kings Meadow Campus, Monday, August 13, 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]: 724-776-3036Tel: 724-772-4028 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 © 2007 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, Monday, August 13, 2018Copyright © 2007 SAE International ABSTRACT Toyota has developed a new system, which uses integrated control of powertrain by PowerTrain Management (PTM), in order to improve driving comfort and reliability. This system is currently in use on Lexus’s new LS460. This system is composed of 4 parts: a generation part, a mediating part, a modifica tion part and a distribution part. In each part, processes are based on drive power and torque. In the generation part, requests from a programmed model driver, Driving Support Computer and Vehicle Dynamics Integrated Management (VDIM) are generated and expressed by drive power. In the mediating part, most suitable vehicle drive power was selected among the requests. In the modification part, the selected request is modified using a programmed powertrain model, which cons iders internal combustion engine condition and powertrain response and transmission’s tolerance. In the distribution part, optimized engine torque and gear ratio are processed. With this system, the most suitable vehicle drive power is accurately accomplis hed with optimized engine torque and gear ratio. Drive system vibration is reduced. While response, and contin uity of drive power before and after changing gears are improved. Co nsequently driving comfort is constantly improved in various driving situations. In addition a highly reliable and efficient design is accomplished by its hierarchy structure and independence of actuator control. This paper describes the structure, features and performance of this system in detail. 1. INTRODUCTION In recent years, computerized control technology has been greatly improved. Also, the need to protect the environment has placed more importance on such things as better fuel efficiency and cleaner emissions. Drivers have also come to expect better vehicle driving performance, comfort, safety, and convenience. Therefore, vehicle control syst ems have increased and have be