Patent ID: 6351942
Filing Date: 2002-03-05
Classification: F02D

Abstract:
A control system for a direct injection engine of a sparking ignition type which is provided with a catalyst in an exhaust passage and a fuel injection valve for directly spraying fuel into a combustion chamber, comprising:a setter for setting an enriched region where an air-fuel ratio is smaller than a stoichiometric air-fuel ratio in a high engine speed region near a maximum engine speed and a high engine load region near a maximum engine load of an operating region of the engine, setting a stoichiometric air-fuel ratio region where the air-fuel ratio is equal to the stoichiometric air-fuel ratio in an area of the operating region of the engine having a lower engine speed or lower engine load than the enriched region, and setting a lean region in the high engine speed region where the air-fuel ratio is larger than the stoichiometric air-fuel ratio and between the stoichiometric air-fuel ratio region and the enriched region, and an air-fuel ratio controller for controlling the air-fuel ratio based on the setting by the setter.