초록 ▼

An engine control device for controlling an air-fuel ratio of an engine, wherein an air-fuel ratio is set at 24 when an output torque of the engine is not more than a first point. It is changed from the value of 24 toward a stoichiometric ratio in accordance with a magnitude of the output torque whe

An engine control device for controlling an air-fuel ratio of an engine, wherein an air-fuel ratio is set at 24 when an output torque of the engine is not more than a first point. It is changed from the value of 24 toward a stoichiometric ratio in accordance with a magnitude of the output torque when the output torque of the engine is in a range of from the first point to a second point and it is set at the stoichiometric ratio (14.7) when the output torque of the engine is more than the second point.

대표청구항 ▼

[ What is claimed is:] [1.] An engine control device in which an air-fuel ratio of said engine is adjusted to one of a group of ratio values including a stoichiometric ratio and a lean ratio, comprising:an air-fuel ratio control unit which adjusts a present lean air-fuel ratio of said engine to a pr

[ What is claimed is:] [1.] An engine control device in which an air-fuel ratio of said engine is adjusted to one of a group of ratio values including a stoichiometric ratio and a lean ratio, comprising:an air-fuel ratio control unit which adjusts a present lean air-fuel ratio of said engine to a predetermined lean air-fuel ratio which is richer than said present lean air-fuel ratio, when a present engine load is more than a predetermined maximum load which can be generated by said present lean air-fuel ratio at a present engine speed;wherein said air-fuel ratio control unit maintains said predetermined lean air-fuel ratio when a present engine load is less than or equal to a predetermined maximum load at present engine speed when said engine is operated at said predetermined lean air-fuel ratio.