EGR (Exhaust Gas Recirculation) is a device for recirculating exhaust gas. It is a device which returns a portion of the exhaust back in to air intake section to lower peak combustion temperature to reduce generation of NOx. The effect is further enhanced when reduction of particulate matter (PM) by high performance fuel injection system and of NOx by intercooler are combined.
EGR coolers are installed where a part of exhaust is returned to air intake section, and acts to feed cooled exhaust to engine.
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