~.eTheEngineering Society~ ForAdvancing Mobility~ LandSeaAirandSpace 400COMMONWEALTH DRIVEWARRENDALE. PA15096 871552 ControlSystemArchitecture foran Advanced ElectricVehiclePowertrain R.G.Landman, P.B.Patil,andJ.C.Burba FordMotorCo. FutureTransportation Technology Conference andExposition Seallie,Washington August10·13,1987Downloaded from SAE International by University of British Columbia, Monday, September 24, 2018Theappearance ofthecodeatthebottomofthefirstpageof thispaperindicates SAE'sconsentlhat copiesofthepapermaybemadelorpers::ma! orinternaluse,or forthepersonal orinternaluseofspecificclients.Thisconsent isgivenonthecon· dilion,however, thatthecopierpaythestatedperarticlecopyfeethrough the Copyright Clearance Center,Inc.,Operations Center,P.O.Box765.Schenectady. N.Y.12301.forcopying beyondthatpermitted bySections 107or108oftheU.S. Copyright Law.Thisconsent doesnotextendtootherkindsofcopying suchas copying forgeneral distribution, loradvertising orpromotional purposes. for creating newcollective works,orlorresale. Paperspublished priorto1978mayalsobecopiedalaperpaperfeeof$2,50 undertheabovestatedconditions. SAEroutinely stocksprintedpapersloraperiodorthreeyearsfollowing dateof publication. DirectyourorderstoSAEOrdp.rDepartment. Toobtainquantity reprintrates,permission toreprintatechnical paperorper­ mission tousecopyrighted SAEpublications inotherworks.contact theSAE Publications Division. Nopartofthispublication maybereproduced inanyform,in anelectronic retrievalsystemorotherwise, without theprior writtenpermission ofthepublisher. ISSN0148·7191 Copyright ©1987SocietyofAutomotive Engineers, Inc. Thispapl.'rissubjecttorevision. Statements andopinions ad­ vancedinpapersordiscussion aretheauthor's andarehis responsibility. notSAE's;however. thepaperhasbeenedited bySAlforuniform stylingandformat.Discussion willbe printl.'dwiththepaperifitispublished inSAETransactions. Forpermission topublishthispaperinfuUorinpart,contact theSAEPublications Division.Personswishingtosubmitpaperstobeconsidered forpre­ sentation orpublication throughSAl:shouldsendthemanu· sniptora300wordabstractofaproposed manuscript to: SCl-retary,rn!,.rjnecring Activity Board,SAE. PrintedinU.S.A.Downloaded from SAE International by University of British Columbia, Monday, September 24, 2018871552 ControlSystemArchitecture foran Advanced ElectricVehiclePowertrain R.G.Landman, P.B.Patil,andJ.C.Burba FordMotorCo, SYSTEM OVERVIEW Anadvanced proof-of-concept ac electric vehicle powertrain, called the electric transaxle (ETX), hasbeen designed andbuilt byFordMotor Com­ pany,WithGeneral Electric Company as asubcontractor, asamajorelement of theDepartment ofEnergy's Electric andHybrid Vehicle Program. The powertrain wasdesigned toadvance thestate oftheartinEVpowertrain technology byremoving thedrawbacks typically associated Withelectric vehicles andhasmetorexceeded the following program objectives [1]: Figure 1isablockdiagram ofthe major powertraincomponents andtheir interactions. Thedccurrent fromthe traction batteries goesthrough the maincontactors totheinverter whereitisconverted tothreephaseacand delivered totheinduction motor, which drives thefront Wheels through a concentrically mounted andautomatical­ lyshifted twospeedtransmission. The integrated motor/transaxle unit,which weighs 170lb.,is23inches longand hasthecapability ofdelivering in excess of50hp,isoneoftheunique features ofthispowertrain. Its design andoperation aredescribed in moredetail in[2J.ABSTRACT Reduced complexity, improved drive­ ability, andincreased energy efficiency areamongtheadvantages whichcanbe obtained through (on-board) computer control ofpowertrains inbothconven­ tional andelectric vehicles. This paperdescribes thedesign andimplemen­tation ofacontrol system foran advanced electric vehicle powertrain, incorporating anintegrated induction motorandtwospeedautomatic transaxle. Thecontrol system employs adistributed computer architecture utilizing a fiberoptic communication system for compu