O.AII!!!TheEngineering~ ResourceFor~ Advancing Mobility 400COMMONWEALTH DRIVEWARRENDALE, PA15096 e rhnical IIriS 861110 DigitalElectronic Controls ForDetroitDieselAllison HeavyHaulingTransmissions RobertC.Boyer DetroitDieselAllison DivisionofGeneral MotorsCorporation International Off-Highway &Powerplant Congress &Exposition Milwaukee, Wisconsin September 8-11,1986Downloaded from SAE International by University of Edinburgh, Friday, August 10, 2018Theappearance ofthecodeatthebottomofthefirstpageofthispaperindicates SAE'sconsentthatcopiesofthepapermaybemadeforpersonal orinternaluse,or forthepersonal orinternaluseofspecificclients.Thisconsentisgivenonthecon­ dition,however, thatthecopierpaythestatedperarticlecopyfeethroughthe Copyright Clearance Genter,Inc.,Operations Center, 21Congress St.,Salem,MA 01970forcopyingbeyondthaIpermitted bySections 107or108oftheU.S.Copyright Law.Thisconsentdoesnotextendtootherkindsofcopyingsuchascopyingfor generaldistribution, foradvertising orpromotional purposes, forcrealingnewcollec­ tiveworks,orforresale. Paperspublished priorto1978mayalsobecopiedataperpaperleeof$2.50under theabovestatedconditions. SAEroutinely stocksprintedpapersforaperiodofthreeyearsfollOWing dateof publication. DirectyourorderstoSAEOrderDepartment. Toobtainquantity reprintrates,permission toreprintatechnical paperorper­ missiontousecopyrighted SAEpublications inotherworks,contacttheSAEPublica­ tionsDivision. -IIIS.·I!-r~,""" ~",~f>I"aad ;;nJ,"J~",J jnIl<rs..!!'G/"hd,1/"1.,1,,,, n~laf>Jl( SAEGLOML MOBILITY IlATAD.\SE Nopartofthispublication maybereproduced inanyfonn,in anelectronic retrievalsystemorotherwise, withouttheprior writtenpermission ofthepublisher. ISSN0148·7191 Copyright 1986SocietyofAutomotive Engineers, Inc. ThiJpaperissubjecttorevision.Statements andopinions ad· vancedinpapersordiscussion arctheauthor's andarchis responsibility, notSAE's;however, thepaperhasbeenedited bySAEforuniform stylingandformat.Discussion wilibe printedwiththepaperifitispUblishedinSAETransactions. Forpennission topublishthispaperinfullorinpart,contact theSAEPublications Division.Penonswishingtosubmitpaperstobeconsidered forpre­ sentation orpublication throughSAEshouldsendthemanu­ scriptora300wordabHrllctofaproposed m:muscript to: Secretary, Engineering ActivityBoard,SAE. PrintedinU.S,A.Downloaded from SAE International by University of Edinburgh, Friday, August 10, 2018861170 Digita~Electronic Corntrols forDetroit Diese~AllisonHeavyHauling Transmissions RobertC.Boyer DetroitDieselAllison Division ofGeneral MotorsCorporation ABSTRACT Detroit DieselAllisonintroduced it'sfirstelec­ troniccontrolled transmission, theDP8000series transmission, in1971withthediscrete logicshift patterngenerator (SPG).In1983,anewstate-of-the­ artdigitalelectronic control optioncalledATEC (Allison Transmission Electronic Control) wasoffered ontheV730seriestransitcoachtransmission. ATEC wasintroduced totheHT700seriestransmission in­ cluding theCLBT755seriesoff-highway transmis­ sionsin1984. InJanuary 1986,theATECsystemreplaced the current SPGelectronics acrosstheboardon5,6,8, and9000seriesoff-highway transmissions. ATEC provides greatercapability andincreased reliability at areduced costovertheSPGelectronics. TheATEC systemiscurrently inafieldtestprogram thatwill continue through thefirstyearofproduction to monitor itsreliability improvement overtheSPG system. Controlled testingtoSAEstandards have quantified fueleconomy andproductivity gainswith ATEC. ALLISON INTRODUCED ITSFIRSTELECTRON­ ICALLY CONTROLLED transmission in1971withthe discrete logicshiftpatterngenerator (SPG)offered on theDP8000seriestransmission. Overalltransmission performance wasimproved byreplacing hydraulic controls withelectro-hydraulic controls. TheSPG systemutilized analogdiscrete logicelectronics to automatically command rangechanges basedupon speedandthrottle whileusingahydraulic valvebody onlyforcontrolduringtheapplication ofthetrans­ missionclutches. Themajorbenefits ofthissystem wereimprove