| 摘要 |
PROBLEM TO BE SOLVED: To provide an air-fuel ratio control device for an internal combustion engine for suitably controlling an air-fuel ratio even during an decrease in the amount of intake air. SOLUTION: A feedback fuel correction amount etdfi (=fuel deviation edfckm×proportional gain GnFBP+fuel deviation integration value esdfc×integral gain GnFBI) is calculated by proportional and integral operation (PI operation), in accordance with the result of the air-fuel ratio detected by an air-fuel ratio sensor for linearly detecting the air-fuel ratio of the engine. When a vehicle is in the process of deceleration, the fuel deviation integration value esdfc is set to be zero. When the vehicle is not in the process of deceleration, a guard with a feedback correction guard rate egddfi is set in the fuel deviation integration value esdfc. COPYRIGHT: (C)2004,JPO
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