Exhaust gas recirculation system

摘要

Amount of recirculated gases is increased at heavy load on an engine so as to improve the emission control. An EGR valve has a first chamber applied with the pressure at an EGR port in an intake passage and a second chamber applied with the pressure in the intake passage at upstream of a throttle valve so as to open the EGR valve. A control valve is provided to be operated pressures in the intake passage to control the pressure in the second chamber so as to open the EGR valve at heavy load on the engine.