| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for accurately control air-fuel ratio. SOLUTION: This air-fuel ratio control device of an internal combustion engine calculates the ignition delay of each cylinder utilizing a cylinder pressure sensor and estimates the air-fuel ratio of each cylinder based on the ignition delay. The device comprises a pressure detection means for detecting the cylinder pressure of the combustion chamber of the internal combustion engine, an estimating means for estimating the monitoring pressure of the internal combustion engine, an ignition delay calculation means for detecting, as a combustion start time point, as a time point where a difference between the cylinder pressure and the monitoring pressure exceeds a predetermined value in the period starting from the compression stroke to the combustion stroke of the internal combustion engine and calculating the ignition delay from the ignition time point to the combustion start time point for each cylinder, and a fuel injection amount calculation means for estimating the air-fuel ratio of each cylinder based on the ignition delay and calculating the fuel injection amount to each cylinder so that the air-fuel ratio of each cylinder is uniformed according to the air-fuel ratio. COPYRIGHT: (C)2007,JPO&INPIT
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