400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 2001-01-0729 Development of Vapor Reducing Fuel Tank System Tomoyasu Arase, Takashi Ishikawa, Masahide Kobayashi, Yoshihiko Hyodo, Masahiro Kasai and Nobuhiro Nakano Toyota Motor Corp. SAE 2001 World Congress Detroit, Michigan March 5-8, 2001Downloaded from SAE International by Columbia Univ, Monday, August 20, 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 $7.00 per article copy fee through the Copyright Clearance Center, Inc. Operations Center, 222 Rosewood Drive, Danvers, MA 01923 for copying beyond that permitted by Sec- tions 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such as copying for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. SAE routinely stocks printed papers for a period of three years following date of publication. Direct your orders to SAE Customer Sales and Satisfaction Department. 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 written permission of the publisher. ISSN 0148-7191 Copyright 2001 Society of Automotive Engineers, Inc. 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 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 considered for presentation or publication through SAE should send the manuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Meetings Board, SAE. Printed in USAAll SAE papers, standards, and selected books are abstracted and indexed in the Global Mobility DatabaseDownloaded from SAE International by Columbia Univ, Monday, August 20, 20182001-01-0729 Development of Vapor Reducing Fuel Tank System Tomoyasu Arase, Takashi Ishikawa, Masahide Kobayashi, Yoshihiko Hyodo, Masahiro Kasai and Nobuhiro Nakano Toyota Motor Corp. Copyright © 2001 Society of Automotive Engineers, Inc. ABSTRACT In succession to the world-first introduction of a mass production gasoline hybrid passenger car into theJapanese market in 1997, Toyota also has introduced anenhanced version of the above to the US and Europeanmarkets in 2000. Upon introduction of Toyota Hybrid System (THS) intothe US market, a drastic reduction of gasoline vaporevaporation from the fuel tank was necessary, in order tomeet the most stringent exhaust emission (SULEV) andevaporative emission standards in the world. In order to meet this requirement, a fuel tank systemnamed "Vapor Reducing Fuel Tank System" wasdeveloped. This is the first commercial application in theworld to use a variable tank volume to drastically reducegasoline vapor generation. INTRODUCTION Proposals have been made in recent years to intensify automobile exhaust/evaporative emission standards in theUS, Japan and Europe in relation to global environmentalissues. Taking the opportunity of introduction into the US market,the mass production of gasoline hybrid passenger car wasmaterialized, with advanced features to meet the worldmost stringent exhaust emission standard and thegasoline evaporative emission standard of California in theUS ahead of their enforcement. In line wit