Patent attributes
An object of the present invention is to provide an exhaust gas recirculation device with an improved response speed and accuracy of exhaust gas recirculation flow control in an internal combustion engine. A recirculation gas control valve controls a recirculation flow rate in exhaust gas recirculation passages of the internal combustion engine. An air intake control valve controls a flow rate in an intake passage of the internal combustion engine. An intake airflow sensor detects a flow rate in the intake passage. A recirculation flow sensor detects an exhaust gas recirculation flow rate in the exhaust gas recirculation passage. An exhaust gas recirculation controller performs feedback control of the intake air control valve and/or the recirculation gas control valve so that the exhaust gas recirculation ratio obtained based on outputs of the intake airflow sensor and the recirculation flow sensor is a target ratio recirculation ratio.
