Exhaust system
32
Combustion
Introduction of New Generation of 4-Cylinder Inline Engines, OM 651
q
Exhaust gas recirculation
The exhaust system of engine 651 combines two tech-
nologies for emission reduction. Exhaust gas recircu-
lation (EGR) reduces emissions of nitrogen oxide (NO
x
)
and exhaust treatment reduces the emission of hydro-
carbons (HC) and soot particles.
With exhaust gas recirculation, part of the exhaust
flow is guided
back through the EGR path to the
charge air.
The recirculated exhaust gas enters the EGR path via
a pre-cooler. There
it is either cooled according to its
temperature or fed directly to the charge air. The
exhaust-air mixture enters the combustion chamber
directly via the charge air manifold.
Exhaust gas recirculation reduces the oxygen (O
2
)
concentration and combustion temperature.
Exhaust gas recirculation
1 EGR pre-cooler
2EGR cooler
3 Charge air manifold
4 Exhaust manifold
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