DESCRIPTION AND OPERATION
Page 49
37
Figure 37 — Non-Catalyzed DPF Unit
Variable Geometry Turbocharger
The engine is equipped with a variable geometry
turbocharger. The turbine housing has a sliding
nozzle ring that maintains sufficient back
pressure in the exhaust manifold for proper
operation of the EGR system. A certain amount
of back pressure is required to push the exhaust
gases into the pressurized intake air at the EGR
mixer.
38
Figure 38 — VGT and Electronic Control
The variable geometry turbocharger (VGT)
provides an infinitely variable volume between
closed and maximum. The turbocharger
maximizes and controls boost pressure over a
broad range of engine speeds. Increased exhaust
back pressure does not adversely affect
turbocharger efficiency. When exhaust manifold
pressure, turbine shaft speed and turbo boost are
at maximum, the nozzle ring is fully closed. When
the nozzle ring is fully open, exhaust manifold
pressure, turbine shaft speed and turbo boost are
at minimum.
1. Muffler
2. Filter
3. Combustion Chamber
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