SAE TECHNICAL PAPER SERIES 960428 Automatic Neutral Control - A New Fuel Saving Technology for Automatic Transmission Masahiro Hayabuchi, Takao Taniguchi, Kazumasa Tsukamoto, Masaaki Nishida, Yoshihisa Yamamoto, and Hiroshi Tsutsui Aisin AW Co, Ltd Reprinted from: Transmission and Drivel me Systems Symposium Efficiency, Components, and Materials (SP-1154) f The Engineering Society ' For Advancing Mobility f Land Sea Air and Space@ INTERNATIONAL International Congress & Exposition Detroit, Michigan February 26-29,1996 400CommonwealthDnve,Warrendale,PA15096-0001US.A Tel (412)776-4841 Fax-(412)776-5760 Downloaded from SAE International by University of New South Wales, Tuesday, September 18, 2018The appearance of the 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 Sections 107 or 108 of U S Copyright Law This consent does not extend to other kinds of copying such as copying for general distnbution, for advertising or promotional purposes, for creating new collective works, or for resale SAE routinely stocks pnnted papers for a period of three years following date of publication Direct your orders to SAE Customer Sales and Satisfaction Department Quantity repnnt rates can be obtained from the Customer Sales and Satisfaction Department To request permission to repnnt a technical paper or permission to use copynghted SAE publications in other works, contact the SAE Publications Group GLOBAL MOBILITY DATABASE Alt SAE papers, standards, and selected books are abstracted and indexed in the Global Mobility Database No part of this publication may be reproduced in any form, in an electronic retneval system or otherwise, without the prior written permission of the publisher ISSN 0148-7191 Copyright 1996 Society of Automotive Engineers, Inc Positions and opinions advanced in this paper are those of the author(s) and not necessanly those of SAE The author is solely responsible for the content of the paper A process is available by which discussions will be pnnted 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 manuscnpt or a 300 word abstract of a proposed manuscnpt to Secretary, Engtneenng Meetings Board, SAE Pnnted in USA 96-0049 Downloaded from SAE International by University of New South Wales, Tuesday, September 18, 2018960428 Automatic Neutral Control - A New Fuel Saving Technology for Automatic Transmission Masahiro Hayabuchi, Takao Tamguchi, Kazumasa Tsukamoto, Masaaki Nishida, Yoshihisa Yamamoto, and Hiroshi Tsutsui Aisin AW Co, Ltd Copyright 1996 Society of Automotive Engineers Inc ABSTRACT AISIN AW has developed a new fuel saving technology called the Automatic Neutral Control System which is installed in the 50-40LN automatic transmission. While idling with the brake apphed, the system shifts the transmission into neutral by automatically releasing its forward clutch, so that the slipping loss of the torque converter is eliminated and less fuel is required to maintain the idling of the engine It shifts back to drive when the foot brake is released or the accelerator pedal is pressed. A fully integrated electro-hydraulic circuit and unique control principle were designed to provide very precise pressure to the forward clutch. As a result, we have confidence that a highly reliable system has been achieved with large improvements in fuel consumption. INTRODUCTION Worldwide trends of growing automatic transmission installation rate