Allison Transmission B3400 xFE

4.2.10ACCELERATIONRATEMANAGEMENT(ARM)(N/AforOFS
Models).
NOTE:ARMwasknownasVehicleAccelerationControl(VAC)prior
toJuly2014.
ARMisanenginemanagementfunctionwheretheTCMmanagesengine
torquetolimitvehicleaccelerationtoacalibratedrate.Thisfunctionwillallow
fulltorquefromtheengineifthevehicleisunabletoreachthecalibrated
accelerationrate,suchasonsteepgradesorwhenthevehicleisheavy.This
functionmaybeusedforthefollowing:
•Toimprovefuelefciency.
•Toreducetirewear.
•Toreduceaccelerationaggressiveness.
•Toprovideforconsistentaccelerationinloadedandunloaded
conditions.
ARMmaybeusedinconjunctionwithDSS.
ARMoffersthelevelsofaccelerationcontrolshowninT able4–3.The
accelerationcontrolsettingisaCMC.
Table4–3.ARMLevelDescriptionAccelerationRateComments
SettingSelection
Description
5
UltraEconomy
Providestheslowestaccelerationrate.
Offersthehighestpotentialforfuelsavings
4
SuperEconomy
3HighEconomy
2
Intermediate
Economy
1BaseEconomy
Providesaccelerationclosesttonormal
vehicleacceleration.Offersthelowest
potentialforfuelsavings
9
OffDefaultSetting
4.2.11LOWSPEEDGRADEASSIST.
Whentheengineisbeingsluggishduringfullthrottleoperation,LowSpeed
GradeAssistallowsaquickertransitionintorstlockupfromsecondconverter
in6-speedtransmissions,andaquickertransitionintosecondlockupfrom
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