400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 SAE TECHNICAL PAPER SERIES 982668 ATF Bulk Oxidative Degradation and Its Effects on LVFA Friction and the Performance of a Modulated Torque Converter Clutch P.A. Willermet The Ford Research Laboratory G. K. Gupta, D. Honkanen, J. W. Sprys and D.G. McWatt The Automatic Transmission Engineering Operations, The Ford Motor Company Reprinted From: Diesel Emissions (SP-1397) International Fall Fuels and Lubricants Meeting and Exposition San Francisco, California October 19-22, 1998Downloaded from SAE International by University of Birmingham, Sunday, August 19, 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 wri tten 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 pu blished 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 30 0 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 University of Birmingham, Sunday, August 19, 20181982668 ATF Bulk Oxidative Degradation and Its Effects on LVFA Friction and the Performance of a Modulated Torque Converter Clutch P.A. Willermet The Ford Research Laboratory G. K. Gupta, D. Honkanen, J. W. Sprys and D.G. McWatt The Automatic Transmission Engineering Operations, The Ford Motor Company Copyright © 1998 Society of Automotive Engineers, Inc. ABSTRACT The friction behaviors of fresh and aged ATFs and a paper-based wet friction material were characterized using a low velocity friction apparatus (LVFA). Friction tests on 30 ml samples of ATF were used to characterize the friction durability of ATFs aged in test vehicles and in the Ford Aluminum Beaker Oxidation Test (ABOT). Oxi- dation test data gave stability rankings for the various ATFs which were consistent with limited vehicle experi- ence. The procedure was applied to the analysis of results from a fleet test run with transmissions equipped with a modulated torque converter clutch. The test was aimed at characterizing friction degradation and shudder. Samples obtained from the test fleet were used to con- struct degradation profiles for two ATFs. The profiles showed no significant difference between the two ATFs in friction sta