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 2007-01-3478 Development of the New Light-Duty Hybrid Truck Ryutaro Hosoya and Koichi Yamaguchi Hybrid Vehicle Development Division, Hino Motors, Ltd. 14th Asia Pacific Automotive Engineering Conference Hollywood, California, USA August 5-8, 2007Downloaded from SAE International by University of New South Wales, Saturday, September 15, 2018The selection for publication of this manuscript is based on standard practices and guidelines of the originating country’s engineering and scientific society in the Asia Pacific region. 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 University of New South Wales, Saturday, September 15, 2018x x xABSTRACT The new light-duty hybrid truck developed by Hino Motors, Ltd. completely redesigned the traction motor, the inverter and the traction battery, which maximizeoutput and efficiency. It also succeeds in balancing low fuel economy and low exhaust emissions by utilizing a combination of a new hybrid system control withspecially developed diesel engine. INTRODUCTION Hino Motors, Ltd. initiated development of parallel hybrid system in 1981, in Japan, since the parallel hybrid system was recognized as having potentials to reduce exhaust emissions and fuel consumption. After years of the development, we were finally able to put the hybridroute bus into practical use for the first time in the world in 1991. Afterwards, the medium-duty hybrid truck andthe large sightseeing hybrid bus were launched in themarket. Then, in November 2003, the hybrid LDT (LDT:Light-duty Truck) came to the market. This hybrid LDT attracted attentions from transportation and convenience store industries who were increasingly keen to reducetheir own environmental effects, and was sold more than 3,000 within 3 years. Figure 1: The New Light-duty Hybrid This article introduces the hybrid system control andsummaries of the hybrid system units which were upgraded during the latest development. Figure 1 showsan external view of the new hybrid LDT, and Table 1 shows specifications. DEVELOPMENT OF THE HYBRID SYSTEM In October 2005, the New Long-Term Diesel EmissionsRegulations was enforced in Japan. We took up a new development project for the traction motor, the inverter, the traction battery, which were main components of the hybrid system to meet the regulation standards, and released the new hybrid LDT in October 2006.TARGETS OF DEVELOPMENT Our goals of the development were to achieve lower pollution level and higher mileage performance, while keeping costs low to promote the spread of low emission vehicles. Targets of development are shown below. Table 1: Specifications of the New H ybrid Improvement of fuel economy: More than 30% improvement c