Allison Transmission B3400 xFE

load.SESSisnotavailablewithacceleration-basedDSS.Inaddition,
DSSusesaninclinometer/accelerometerintheTCMtorenethe
selectionoftheappropriateshiftschedulebasedonvehicleoperating
requirements.
TheTCMwillinitializeinthesamemode,EconomyorPerformance,
thatitwasinwhenlastshutdown.Thevehicleloadisre-estimated
duringthersthighthrottleaccelerationandtheappropriatemodeis
commanded.ThemodeisalsoresettoPerformancewhenoneofthe
followingisdetected:
–Anenginede-ratecondition
–Thelossoftorquedatafromtheengine
Inadditiontoprovidingthecapabilitytoautomaticallyswitchbetween
performanceandeconomyschedules,theavailabilityofeconomymodein
DSSisselectableasaCMCwithAllisonDOC
®
withintheshiftcalibrationas
follows:
Table4–2.DSSECONOMYMODE
CMCSettingSelection
Description
1Reserved1
Reservedforfutureuse
2Reserved2
Reservedforfutureuse
3LowThissettingkeepsthevehiclein
economymodewhenlightlyloaded
oronlowupgrades.Thevehiclewill
alwaysbeinperformancemodeif
carryingaloadorwhennegotiating
moderategrades.
4Medium
Thisisthedefaultvalue.Thissetting
keepsthevehicleineconomy
modemorethanthedefaultsetting.
Whenthevehicleisempty,even
onmoderategrades,economy
modeisnormallyinuse.Likewise,
economymodealsoisusedon
nearly-levelgradeswithmoderate
loads.Performancemodewillbe
commandedwhenheavilyloaded
orwithmoderateloadsonlarger
grades.
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