Answer Posted / kkumar

EGR means Exhaust Gas Recirculation. The main function of
EGR is to control NOx emission from the engine.
At elevated temperature (during long run & full condition)
if due to some reasons engine gets heated up beyond certain
level... it produces NOx emission. In order to avoid this
pollution , we have to control the temperature rise inside
the cylinder. This can be achieved by mixing some amount of
exhaust gas with intake air. By doing this the temperature
inside the combustion chamber is reduced. And NOx is controlled.

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