400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 982667 Development of a Vehicle Test for Determining ATF Performance in an Electronically Controlled Capacity Clutch Coleman Jones General Motors Powertrain Group James L. Linden General Motors Research and Development Center Reprinted From: Automatic Transmission Fluids (ATF) (SP-1394) International Fall Fuels and Lubricants Meeting and Exposition San Francisco, California October 19-22, 1998Downloaded from SAE International by Stony Brook Univ, Sunday, August 12, 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 ascopying 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 1998 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 inSAE 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 Stony Brook Univ, Sunday, August 12, 20181982667 Development of a Vehicle Test for Determining ATF Performance in an Electronically Controlled Capacity Clutch Coleman Jones General Motors Powertrain Group James L. Linden General Motors Research and Development Center Copyright © 1998 Society of Automotive Engineers, Inc. ABSTRACT A test was developed to determine the effect of licensed DEXRON®-III service fluids on the performance of the Electronically Controlled Capacity Clutch (EC3). Some fluids can cause shudder and/or hunting of the clutch andare unsuitable for use in EC 3-equipped vehicles. The test uses a 1997 Riviera with a 3800 SC engine and a 4T65Etransmission to evaluate fluids under a variety of drivingconditions. The responses to both the reference andcandidate fluids are statistically compared with eachother and with pooled data from previous reference teststo identify and reject unsuitable fluids. The DEXRON ®-III specification has been modified to include this test toensure the elimination of unsuitable DEXRON ®-III fluids from the marketplace. INTRODUCTION The use of lockup torque converter clutches can increasethe fuel economy of vehicles equipped with automatictransmissions (1,2). The clutches are usually not lockedat low speeds due to the transmission of objectionableengine vibrations to the drivetrain and vehicle. Slippingth