Direct injection internal combustion engine and injector used for direct injection internal combustion engine

摘要

It is necessary to attain the combustion stability when performing ignition retarding in order to reduce exhaust gas and raise the exhaust gas temperature under a cold start condition, as well as soot reduction under a fully open throttle valve (23) condition.
An injector (9) according to the present invention comprises: a plurality of fuel passages (11a-11F,13a-13F,38a-38H,40a-40H) having an axis line inclined with respect to a valve operation axis line (9A) at a nozzle end; wherein inclined axis lines of at least three of the fuel passages have a spreading angle, none of them intersecting with each other, and three injection points (10f,10e,10a) are formed in a plane perpendicular to a valve operation axis line (9A) to form a triangle (100); and wherein at least one center-oriented fuel passage having an injection point (10B) around the center of the triangle (100) is provided.