SYSTEM FOR RECIRCULATING EXHAUST GAS OF ENGINE

摘要

The present invention relates to a system for recirculating exhaust gas of an engine. The system for recirculating exhaust gas of an engine according to the present invention comprises: a turbo charger having a turbine formed therein to rotate by the exhaust gas of the engine and a compressor in contact with the turbine to compress air supplied to the engine; a high pressure EGR line connecting a front end of the turbine on an exhaust line and a rear end of the compressor on an intake line to each other; a high pressure EGR valve provided in the high pressure EGR line to adjust an amount of exhaust gas supplied from the exhaust line to the intake line; a low pressure EGR line connecting a rear end of the turbine on the exhaust line and a front end of the compressor on the intake line; a low pressure EGR valve provided in the low pressure EGR line to adjust an amount of exhaust gas supplied from the exhaust line to the intake line; an intake pressure adjustment valve provided on the front end of the compressor on the intake line to adjust an amount of intake air; and a controller which classifies a combustion condition into a low temperature combustion condition and a general combustion condition on the basis of a load compared to RPM of the engine and adjusts opening areas of the high pressure EGR valve, the low pressure EGR valve, and the intake pressure adjustment valve according to the combustion condition.