INTERNAL COMBUSTION ENGINE INTAKE AIR PASSAGE STRUCTURE

摘要

PROBLEM TO BE SOLVED: To provide an internal combustion engine intake air passage structure capable of refluxing exhaust air to an intake air passage via an exhaust air passage and further strictly controlling a refluxed volume even if a deflection degree of an intake air flow is small in controlling an exhaust air volume refluxed to the intake air passage through an exhaust air refluxing passage by means of an intake air flow control valve. SOLUTION: An internal combustion engine includes an intake air flow control valve 20 which controls the deflection degree of an intake air flow in an intake pipe 16 of the intake air passage 10, and an EGR passage 18 which connects an exhaust passage and intake pipe 16 of the engine to reflux a part of the exhaust air to the intake pipe 16. An opening 30 in the EGR passage 18 facing the intake pipe 16 of the intake air passage 10 comprises a first opening and a second opening. The intake air flow control valve 20 makes openings of the EGR passage 18 fully open when maximizing the deflection degree of the intake air flow and makes only a first opening close among the openings of the EGR passage 18 when minimizing it. COPYRIGHT: (C)2009,JPO&INPIT