| 摘要 |
PROBLEM TO BE SOLVED: To provide an air-fuel ratio control device of an internal combustion engine which suppresses the deterioration of exhaust emission at sudden change of an output signal of an oxygen sensor when carrying out feedback-control of air-fuel ratio by employing an output signal of an oxygen sensor arranged on a downstream side of a catalyst. SOLUTION: A sudden change of an output signal of an oxygen sensor is predicted in advance during execution of feedback control. When the sudden change of the output signal of the oxygen sensor is predicted, a feedback control signal in the feedback control is reduced more than usual. The sudden change of the output signal of the oxygen sensor can be predicted on the basis of an integral value of the feedback control signal. COPYRIGHT: (C)2007,JPO&INPIT
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