SA E TECHNICAL PAPER SERIES The INVECS-II Electronically Controlled Automatic Transaxles for FWD Passenger Cars Katsutosh~ Usuki, Kenjiro Fujrta, and Katsuhrro Hatta Mitsubrsh~ Motors Cop Reprrnted from Transmrssron and Drrvellne Systems Symposium. Effrcrency, Components, and Materrals (SP-1154) The Engrneerrng Soc~ety 61 =For,dvancrng mfity and sea Arr and Space, lnternatronal Congress & Exposrtron Detrort, Mlchrgan February 26-29,1996 400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S A Tel (412)776-4841 Fax (412)776-5760 Downloaded from SAE International by University of British Columbia, Tuesday, September 25, 2018The appearanceofthe ISSN codeatthe bottom ofthlspage indicatesSAE's consent that copies of the paper may be made for personal or Internal use of specfic cl~ents Th~sconsent lsg~ven on the condd~on however,thatthe copler pay a$7 00 per arbcle copy fee through the Copynght Clearance Center, Inc Opemons Center, 222 Rosewood Dnve, Danvers, MA01 923forwpylng beyondthat permmed by Secttons 107 or 108 of U S Copynght Law This consent does not extend to other lclnds of copylng such as wpylng for general dlstnbmon, for adverbs~ng or promobonal purposes, for creahng new wllect~ve works, or for resale SAE mubnely stocks pnnted papers for a penod of three years follmng date of publ~cat~on Dlrect your orders to SAE Customer Sales and Satlsfactlon Department Quantlty repnnt rates can be obmned from the Customer Sales and Sabsfaaon Department To request permlsslon to repnnt a technical paper or permlsslon to use wpynghted SAE publlcahons In other works, contact the SAE Publ~catnns Group All SAE papen, standard+, and S8I& books are absb-acted and rndexed rn he Global Mobrldy Database No part of thls publicabon may be reproduced In any form, in an electronic retneval system or otherwise, without the pnor wntlen permlsslon of the publ~sher ISSN 01467191 copyr~ght 1946 Soc~ety of Automobve Engineers, Inc Posdions and oplnlons advanced In thls paper are those of the author(s) and not necessarily those of SAE The author 1s solely respons~ble for the content of the paper A process IS available by which dlscuss~ons wll be pnnted with the paper d d e published in SAE Transactions For permission to publish thls paper in full or in part, contact the SAE Publlcatrons Group Persons w~shlng to subrnlt papers to be cons~dered for presentatron or publlcabon mrouah SAE should send the manuscnot or a 300 word abstract of a Drowsed . . manGcnpt to Secretary, Englneenng ~eebngs Board, SAE Pnnted an USA m Downloaded from SAE International by University of British Columbia, Tuesday, September 25, 2018The INVECS-I1 Electronically Controlled Automatic Transaxles for FWD Passenger Cars Katsutoshl Usukl, Kenjlro Fujita, and Katsuhiro Hatta Mrtsubish~ Motors Corp Copynght 1996 Soclely of Automotive EnglneeFs, Inc ABSTRACT MGubishi Motors has developed the INVECS-II 4- speed (F4A4 model) and 5-speed (F5A5 model ) auto- matic transaxles wlth electronic control for FWD pas- senger cars These transaxles feature simplified construction and lighter weight by employing clutch-to-clutch shlft- Ing, where the release clutch IS d~redly changed overto the apply clutch dunng sh~fting Moreover, an innovative sh~ft-schedule control has been incorporated in the transaxles so that the gear selection can be properly achieved in response to dnv- ing condttions and dnvlng habtts of ind~vldual dnvers In addrtion, the transaxles have an additional fea- ture of "SPORTY MODE", in which the driver can choose a dynamic dnve feel as is available in a manual transmission vehicle INTRODUCTION The new automatic transaxles, INVECS-II which stands for htelligent & hnovative yeh~cle Electronic Control system, have been developed to attain such - goals as compact-size, weight saving, easy-dnvlng, re- duced operational noise and improvement in overall product attractiveness The key elements to our 0bjecti~e~ are,