| 摘要 |
PROBLEM TO BE SOLVED: To maintain stable emission characteristics by enabling to stably learn a learning value in sub feed back control in an air fuel ratio control device for an internal combustion engine. SOLUTION: Output signal 102 from a downstream side exhaust gas sensor 8 is fed back in fuel injection quantity to make air fuel ratio of exhaust gas flowing out of catalyst agree with a reference value. In this sub feed back control, integration value of deviation 106 of output signal 102 from the downstream side exhaust gas sensor from the reference value 104 is calculated by an integration value calculation means 34, and an integration value signal 122 thereof is smoothed by a smoothing means 36. The learning value 126 for compensating constant error included in air fuel ratio signal 100 from an A/F sensor 6 is learned from the smoothed integration value signal 124. COPYRIGHT: (C)2005,JPO&NCIPI
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