400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 Web: www.sae.org 2005-01-0265 Investigation into Fuel Economy and NOx Emissions of Light Duty Hybrid Truck in Real Traffic Conditions Yutaka Takada, Shigeru Ueki and Akira Saito Organization for the Promotion of Low Emission Vehicles (LEVO) Reprinted From: Advanced Hybrid Vehicle Powertrains 2005 (SP-1973) 2005 SAE World Congress Detroit, Michigan April 11-14, 2005 SAE TECHNICAL PAPER SERIESDownloaded from SAE International by Univ of California Berkeley, Thursday, August 02, 2018The 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. This 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 ServiceTel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-1615Email: Customer [email protected] ISSN 0148-7191Copyright © 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 themanuscript or a 300 word abstract to Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by Univ of California Berkeley, Thursday, August 02, 20182005-01-0265 Investigation into Fuel Economy and NOx Emissions of Light Duty Hybrid Truck in Real Traffic Conditions Yutaka Takada, Shigeru Ueki and Akira Saito Organization for the Promotion of Low Emission Vehicles (LEVO) Copyright © 2005 SAE International ABSTRACT Hybrid trucks are disseminated on the market in Japan. To bring out advantages of fuel economy and low emission, on-board measur ing system for fuel consumption and NOx emissions was mounted in a light duty truck with a parallel hybrid system. Tests were carried out with various payloads on roads. As the results, advantages of the tested hybrid truck were shown from the actual data regarding the fuel economy and NOx emissions, considering regeneration energy by the hybrid system. Improv ement of the fuel economy and NOx emissions was clearly observed in the running condition such as urban and suburban roads. From the analysis of regeneration energy during vehicle deceleration, it turned out that a longer slowdown time and a higher speed at which deceleration begins result in larger amount of energy regeneration, which means the improvement of fuel ec onomy. For the improvement of roadside pollutions, the reduction of NOx emissions in running using the second gear position is desired. INTRODUCTION The air pollution caused by vehicles is very serious in big cities. Air quality problem can be divided roughly into two cases by the extent of the domain to be treated. One is a case for relatively large area, where total amount of harmful exhaust emissions poses problems. The other case is for narrow areas such as crossings in valleys of buildings, where the evaluation of pollution at local roadside should be focused, in addition to the discussion of total amount of harmful exhaust emissions. To address these cases, various air pollution preventive measures such as improvement of a traffic style, improvement of road structure,