Exhaust gas recirculation device of internal combustion engine, and control method of the device

摘要

An exhaust gas recirculation device of an internal combustion engine includes a turbocharger (5), a low-pressure EGR passage (31), a high-pressure EGR passage (41) and an air flow meter (7). The device feedback-controls the high-pressure EGR gas amount in accordance with the fresh air amount, and open-loop controls the low-pressure EGR gas amount on the basis of the state of operation of the internal combustion engine. The device sets the degrees of opening of appliances and the fresh air amount at reference values. On the basis of the fresh air amount measured when the setting is done, the device learns and corrects a relationship between the low-pressure EGR gas amount and the degrees of opening of the appliances capable of adjusting the low-pressure EGR gas amount.