Navistar MaxxForce 15 - Interstage Cooler (ISC)

18ENGINESYSTEMS
Figure9Lowandhigh-pressureturbochargercomponents
1.Low-pressureturbocharger
assembly
2.High-pressureturbochargeroil
supplyhose
3.Aircontrolvalve
4.High-pressureturbocharger
assembly
5.High-pressureturbocharger
compressorinlet
6.High-pressureturbocharger
turbineinlet
7.Low-pressureturbocharger
assembly
8.Low-pressureturbochargeroil
supplyhose
9.Low-pressureturbocharger
compressoroutlet
10.Low-pressureturbocharger
compressorinlet
11.High-pressureturbocharger
compressoroutlet
12.High-pressureturbocharger
wastegateactuator
13.Turbineoutputpressuretube
14.Turbochargeroildraintube
assembly
15.Low-pressureturbocharger
turbineoutlet
Thelowandhigh-pressureturbochargersareinstalled
inseriesontherightsideoftheengine.The
high-pressureturbochargerisconnecteddirectly
totheexhaustmanifoldthroughthehigh-pressure
turbineinlet.Theturbineinputofthelow-pressure
turbochargerisconnectedtotheturbineoutletof
thehigh-pressureturbocharger.Thehigh-pressure
turbochargerisequippedwithawastegateactuator
whichregulatesturbochargerboostbycontrolling
theamountofexhaustgasesthatpassthroughthe
turbine.Whenboostdemandislow,thewastegate
opens,allowingpartoftheexhaustgasowtobypass
theturbine.
Freshairfromtheairlterentersthelow-pressure
compressorwhereitiscompressedanddirectedinto
theInterstageCooler(ISC).Cooledcondensedair
fromtheISCentersthehigh-pressurecompressor,
whereitisfurthercompressedanddirectedtothe
High-PressureChargeAirCooler(HPCAC)mounted
nearthecoolingmodule.Cooledandcondensedair
thenowsdirectlyintotheenginethrottlevalve.
InterstageCooler(ISC)
TheISCisinstalledbetweenthelow-pressureand
thehigh-pressureturbochargers.TheISCairinlet