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International DT466 – ENGINE SYSTEMS – Air Management System – Air Flow

Air flows through the air filter assembly and enters the Variable Geometry Turbocharger (VGT). The compressor in the VGT increases the pressure, temperature, and density of the intake air before it enters the Charge Air Cooler (CAC). Cooled compressed air flows from the CAC into the EGR mixer duct.

• If the EGR control valve is open, exhaust gas will mix with filtered intake air and flow into the intake manifold.
• If the EGR control valve is closed, only filtered air will flow into the intake manifold.

After combustion, exhaust gas is forced through the exhaust manifold to the EGR cooler and VGT.
• Some exhaust gas is cooled in the EGR cooler and flows through the EGR control valve to the EGR mixer duct.            When exhaust gas mixes with filtered air, Nitrogen Oxide (NOx) emissions and noise are reduced.
• The rest of the exhaust gas flows to the VGT, spins and expands through the turbine wheel, varying boost pressure.

• The VGT compressor wheel, on the same shaft as the turbine wheel, compresses the mixture of filtered air.

The VGT responds directly to engine loads. During heavy load, an increased flow of exhaust gases turns the turbine wheel faster. This increased speed turns the compressor impeller faster and supplies more air or greater boost to the intake manifold. Conversely, when engine load is light, the flow of exhaust gas decreases and less air is directed into the intake manifold.