DL06K Interim Tire-4 Diesel Engine Technical Information
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2.3.9. Exhaust gas recirculation (EGR)
z To reduce exhaust gas, the EGR (Exhaust Gas Recirculation) circulates some of
exhaust gas combusted in the engine to the intake side, and supplies it to the
engine after cooling for re-combustion to reduce NOx emission amount.
z Operating principle : To reduce NOx exhaust gas amount emitted from the engine,
the exhaust gas that contains almost no oxygen is circulated to the intake side,
so that concentration of oxygen supplied to the engine can be reduced for the
reduction of NOx emission by inducing low-temperature combustion.
When EGR is applied, combustion is normal because of its characteristics.
Therefore, the NOx and PM generation amount increases during combustion. To
resolve this problem, both DPF and EGR are applied, and the EGR cooler is
used to reduce NOx generation (by reducing the temperature of high-pressure
exhaust gas) and improve engine combustion efficiency.
EJ9OM055
Throttle
Valve
Intake
Intake
Exhaust
Exhaust
Turbine
Compressor
EGR
Valve
Charge Air Cooler
EGR Cooler
DPF
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