Exhaust gas recirculation control device of engine

An exhaust gas recirculation (EGR) control device of an engine, comprising:

• an exhaust turbocharger having a turbine disposed in an exhaust passage of the engine and a compressor disposed in an intake passage;
• an intercooler disposed in a part of the intake passage downstream of the compressor;
• a low-pressure EGR passage connecting a part of the exhaust passage downstream of the turbine to a part of the intake passage upstream of the compressor;
• a low-pressure EGR valve disposed in the low-pressure EGR passage and for changing a cross-sectional area of the low-pressure EGR passage;
• a high-pressure EGR passage connecting a part of the exhaust passage upstream of the turbine to a part of the intake passage downstream of the intercooler;
• a high-pressure EGR valve disposed in the high-pressure EGR passage and for changing a cross-sectional area of the high-pressure EGR passage;
• a valve control device for controlling openings of the low-pressure EGR valve and the high-pressure EGR valve;
• and
• a gear range detector for detecting a gear range of a transmission of a vehicle in which the engine is installed,
• wherein while the engine is in an idle operation, when the gear range detected by the gear range detector is a non-travel range, the valve control device controls the openings of the low-pressure EGR valve and the high-pressure EGR valve so that a ratio of an amount of exhaust gas recirculated by the high-pressure EGR passage with respect to a total amount of exhaust gas of the engine recirculated by the low-pressure EGR passage and the high-pressure EGR passage becomes higher than that when the detected gear range is a travel range.