Patent ID: 7620488

Claim:
An engine control apparatus comprising: an intake passage fuel injector for executing an intake passage fuel injection; an in-cylinder fuel injector for executing an in-cylinder fuel injection; a correcting portion that corrects a fuel injection quantity to bring an air-fuel ratio close to a predetermined target air-fuel ratio by selectively executing an increase-correction of the fuel injection quantity when the air-fuel ratio is on the lean side and a decrease-correction of the fuel injection quantity when the air-fuel ratio is on the rich side; and a switching portion that divides the fuel injection quantity according to a distribution ratio between the two fuel injectors, makes one of the fuel injectors responsible for the larger part of the ratio and the other fuel injector for the smaller part of the ratio, and switches the fuel injector responsible for the larger part of the ratio according to the operating state of the engine when executing one of the increase-correction and the decrease-correction by the correcting portion, wherein the switching portion switches the fuel injector when the engine is operating in a predetermined distributed injection region, and wherein when the engine is operating in a state in which homogeneity of an air-fuel mixture in a cylinder is required, the switching portion makes the intake passage fuel injector the injector responsible for the larger part of the ratio during the increase-correction and makes the in-cylinder fuel injector the injector responsible for the larger part of the ratio during the decrease-correction.