400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 Web: www.sae.org 2005-01-0273 Development of Hybrid System for SUV Akihiro Kimura, Ikuo Ando and Kenji Itagaki Toyota Motor Corp. Reprinted From: Advanced H ybrid Vehicle Powertrains 2005 (SP-1973) 2005 SAE World Congress Detroit, Michigan April 11-14, 2005 SAE TECHNICAL PAPER SERIESThe Engineering Meetings Board has approved this paper for publication. It has successfully completed SAE’s peer review process under the supervision of the session organizer. Th is process requires a minimum of three (3) reviews by industry experts. 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]: 724-772-4028Fax: 724-772-4891 For multiple print copies contact: SAE Customer Service Tel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-1615Email: Customer [email protected] ISSN 0148-7191 Copyright © 2005 SAE International 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 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 the manuscript or a 300 word abstract to Secretary, Engineering Meetings Board, SAE. Printed in USA2005-01-0273 Development of Hybrid System for SUV Akihiro Kimura, Ikuo Ando and Kenji Itagaki Toyota Motor Corp. Copyright © 2005 SAE International ABSTRACT Toyota Hybrid System (THS), that combines a gasoline engine and an electric motor was installed in the Prius, which was introduced in 1997 as the world’s first mass-produced hybrid pass enger car, and was vastly improved in 2003. The new Prius gained a status of highly innovative and practical vehicle. In 2005, combined with a V6 engine, THS had a further evolution as a Hybrid System for SUV, which was installed in the RX400h and Highlander Hybrid to be introduced into the world. This report will explain "new THS" which achieved both V8 engine power performance and compact class fuel economy, while securing t he most stringent emission standard, SULEV. INTRODUCTION Faced with growing public concern about atmospheric contamination and global warming by carbon dioxide (CO 2), automobile manufacturers are now required to further reduce automobile exhaust gas and CO2 emissions through improvement of fuel efficiency. A hybrid system that combines an internal combustion engine and an electric motor is recognized as a very effective means for satisfying the above requirements. Toyota developed in 1997 the world’s first mass-produced hybrid system, called the Toyota Hybrid System (THS). Since then, vehicles incorporating a hybrid system (hybrid vehicles) have rapidly expanded the market (Fig.1) and thus contributed to conservation of the global environment. However, only a limited number of hybrid passenger vehicle models are available today, making it difficult for some customers to find the models they need. Most hybrid systems produced today are installed in small-sized vehicles. Their performance is insufficient for driving the type of heavy-duty vehicles that em it larger amounts of CO 2 than small and medium-sized vehicles. This paper presents and discusses a new hybrid system that Toyota has developed by further improving the conventional Toyota Hybrid System in order to expand the use of hybrid systems in sports utility vehicles (SUVs). Fig.1 Sales Volume 1. TOYOTA HYBRID SYSTEM II F