400COMMONWEALTH DRIVEWARRENDALE, PA15096 85 i i Is i i is Roberte..Boyer DetroitDieselAllison DivisionofGeneralMotorsCorporation Earthmoving IndustryConference Peoria,Illinois April15-17,1985Downloaded from SAE International by University Of Newcastle, Wednesday, August 08, 2018Theappearance ofthecodeatthebottomofthefirstpageofthispaperindicates SAE'sconsentthatcopiesofthepapermaybemadeforpersonalorinternaluse,or forthepersonalorinternaluseofspecificclients.Thisconsentisgivenonthecon­ dition,however, thatthecopierpaythestatedperarticlecopyfeethroughthe Copyright Clearance Center,Inc.,Operations Center, 21Congress St.,Salem,MA 01970forcopyingbeyondthatpermitted bySections 107or108oftheU.S.Copyright Law.Thisconsentdoesnotextendtootherkindsofcopyingsuchascopyingfor generaldistribution, foradvertising orpromotional purposes, forcreatingnewcollec­ tivewod<s,orforresale. PaperspUblished priorto1978mayalsobecopiedataperpaperfeeof$2.50under theabovestatedconditions. SAEroutinelystocks print~dpapersforaperiodofthreeyearsfollowing dateof publication. Dire.ctyourorder§to SAEOrderDepartment. Toobtainquantityreprintrates,permission toreprintatechnical paperorper­ misSionJo u.secopyrightedSAE pUblications inotherworks,contacttheSAEPublica­ tionsDivision. ISSN0148·7191 Copyright 1985SocietyofAutomotive Engineers, Inc.Downloaded from SAE International by University Of Newcastle, Wednesday, August 08, 2018850782 sissisi iIigital ~.m:::IJ~1 Ii RobertC.Boyer DetroitDieselAllison DivisionofGeneralMotorsCorporation ABSTRACT Detroit DieselAllisonintroduced it'sfirstelec­ troniccontrolled transmission, theDP8000series transmission, in1971withthediscrete logicshift pattern· generator (SPG).In1983,anewstate-of­ the-artdigitalelectronic controloptioncalledATEC (Allison Transmission Electronic Control) wasoffered ontheV700seriestransitcoachtransmission. Today, theATECcontrolisavailable onallHT700series transmissions including theCLBT700seriesoff- highway transmissions. . InJanuary 1986,theATECsystemwillreplace thecurrentSPGelectronics acrosstheboardon5,6, 8,and9000seriesoff-highway transmissions. Itwill offergreater capability andincreased reliability ata reduced costoverthecurrentelectronics. TheATEC systemiscurrently inafieldtestprogram thatwill demonstrate itsreliability improvement overtheSPG system. ALLISON INTRODUCED IT'SFIRSTELECTRONIC CONTROLLED transmission in1971withthediscrete logicshiftpatterngenerator (SPG)offeredontheDP 8000seriestransmission. Overall transmission per­ formance was.improved byreplacing hydraulic con­ trolswithelectrohydraulic controls. TheSPGsystem utilized analogdiscrete logicelectronics toauto­ matically. command rangechanges baseduponspeed and.throttle whileusingahydraulic valvebodyonly for.control duringtheapplication ofthetransmission clutches••Themajorbenefits ofthissystem were improved shift.pointaccuracy andtheelimination of mechanical linkages. Inthelate70's,DDAbeganthedevelopment of the..secondgeneration electronic controls basedupon microprocessor computer basedelectronics forits intelligence.( 1)*Thisnewcontrol wasdesigned for *Numberinparenthesis designates Reference atend ofpaper.deployment acrosstheentirelineofon-highway and off-highway transmissions. Additional benefits ofthe computerized controlincluded preciseshiftaccuracy andoptimization, improved fueleconomy, selfdiag­ nostics, transmission-application customization, gains inperformance, andpotential overallpowertrain op­ timization. In1983thisnewAllisonTransmission Electronic Control(ATEC)systemwasofferedasanoptionwith theVseriestransitcoachtransmission. Today,the ATECsystemisavailable onallHTseriestransmis­ sionsincluding theCLBT700seriesoff-highway transmissions. TheATECsystemwillreplace thecurrent SPG electronics acrosstheboardonthe5000,6000,DP 8000,andCLBT9000heavydutyoff-highway trans­ missions inJanuary 1986.TheATECsystemwilloffer greater capability andincreased reliability atare­ ducedcostoverthecurrent SPGelectronics. The off-highway ATECsystem