SSANGYONG Korando 2012 Manual page 303

f. Features
As EGR ratio goes up, smoke volume will be
higher. But, this lowers the combustion chamber
temperature and accordingly the concentration of
NOx is decreased. The point with highest NOx is
immediately after TDC.
As EGR temperature goes up, the
concentration of NOx will be higher. Thus, it is
necessary to cool down the exhaust gas.
However, during engine cooled, it may cause
large amount of PM. To prevent this, the
exhaust gas is bypassed the EGR cooler.
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