DIRECT INJECTION-TYPE INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To reduce both of NOx and soot. SOLUTION: In this direct injection-type internal combustion engine where the fuel is injected to a combustion chamber 1 from a central part of a ceiling face opposite to a top face of a piston toward a circumferential part of a cavity 9 of a central part of the piston top face, the combustion chamber 1 is provided with the intake free from the circulated exhaust or the intake 11 of low concentration of the circulated exhaust, and the intake containing the circulated exhaust or the intake 12 of high concentration of circulated exhaust in an inner region and an outer region of an approximately hemispherical face or an approximately flat hemispherical face 13 around a fuel injecting position in starting of the fuel combustion near a final period of the compressing stroke. The intake containing the circulated exhaust or the intake of high concentration of the circulated exhaust is located in the inner region and the intake free from the circulated exhaust or the intake of low concentration of circulated exhaust is located in the outer region in a high load or high rotation.