Volvo VN - Traction Control System (Tcs) (Optional); Volvo Enhanced Stability Technology

292OPERATION
VOLVOENHANCEDSTABILITY
TECHNOLOGY
SomevehiclesareequippedwithV olvoEnhancedStabilityTechnology(VEST).
VESTisanadvancedstabilitycontrolsystemdesignedtoprovidebothrollstability
andunder-andover-steercorrectioninawidevarietyofdrivingconditions.VEST
continuouslymonitorsavarietyofvehicleparametersandsensors(includingsteering
anglesensor)todeterminewhetherthevehicleisreachingcriticalstabilitythreshold.
Atthatpoint,VESTisdesignedtointervenebyinstantlyde-throttlingtheengineand
applyingindividualtractorandtrailerbrakesasneededtoregaincontrol.
TRACTIONCONTROLSYSTEM(TCS)
(OPTIONAL)
CAUTION
DONOTengagethedifferentiallocks
whilewheelsarespinning.Serious
damagetothedifferentialwilloccur.
See“AXLES”,page342formore
information.
TheTractionControlSystem(TCS)usesthesamewheelsensorsastheABSto
determineifonesetofdrivewheelsisspinningfasterthantheotherwheelset.Ifthe
TCSdeterminesthatawheelisspinning(withvehiclespeedbelow40km/h[25
mph]),itoperatesthebrakesystemtoapplysomebrakeforcetostopthespinning
wheel(s).Thisputsthedrivepowerovertothestationarywheel(s).
Ifvehiclespeedisabove40km/h(25mph),asignalissenttotheengineECU,which
reducestheenginespeedtobeconsistentwithvehiclespeed.Thisactionhelpsreduce
theamountofwheelspinandgivestheoperatorgreatervehiclecontrol.