Allison Transmission T 280 User Manual

Table4–2.DSSECONOMYMODE(cont'd)
CMCSettingSelection
Description
5
HighThissettingkeepsthevehicle
ineconomymodeinmost
circumstances.Performance
willtypicallybecommandedonly
whennegotiatingseverewhen
heavilyloaded.Thissettingpermits
higherpoweredvehiclestobein
economymodeformostoperations
exceptduringthemostdemanding
operatingconditions.
4.2.7OVER-TEMPERATURESHIFTSCHEDULE(N/AforOFSModels).
Regardlessofoperatorrequest,theTCMautomaticallylimitstransmission
operationto4(FourthRange)orbelowduringoilover-temperatureconditions.
Ifthetransmissionisabove4(FourthRange)whenover-temperatureoccurs,
thepreselectshiftscheduleisusedforalldownshiftsuntil4(FourthRange)is
reached.
4.2.8CRUISEMODESHIFTSCHEDULE.Thisshiftscheduleisactivated
whenaSAEJ1939datalinkmessageisreceivedtoindicatethatcruise
controlisactive.Shiftpointsforthisoperationaremodiedinordertoreduce
thefrequencyofupshiftsanddownshiftsduringcruiseoperation.Thisshift
scheduleisastandardfeatureofeachshiftcalibration.
Thevehiclecruisecontrolfeaturesinteractwithretarderactivation/deactivation
andaredeterminedbycalibrationandCMC(s).Referto4.3.2RETARDER/
CRUISECONTROLINTERACTIONS.
4.2.9ACCELERATION-BASEDPATTERN(ABP).
AllcalibrationsincludetheABPfeature.ABPraisesthefullthrottleupshiftand
downshiftpointsunderthefollowingconditions:
•Thethrottlepositionisatornear100%.
•Thevehicleisnotaccelerating.Anexampleoftheseconditionsisa
loadedvehicleclimbingagrade.ABPwilldownshiftthetransmission
athigheroutputshaftspeedsthanthestandardfullthrottledownshifts.
Downshiftingthetransmissionincreasestheoutputtorqueandallows
thevehicletomaintainroadspeed.
67

Allison Transmission T 280 Specifications

General

Brand	Allison Transmission
Model	T 280
Category	Controller
Language	English