| 摘要 |
An inter-cylinder air-fuel ratio imbalance abnormality detection apparatus includes an air-fuel ratio sensor disposed in an exhaust passage of a multi-cylinder internal combustion engine, and an abnormality detection unit that detects an inter-cylinder air-fuel ratio imbalance abnormality on the basis of a degree of variation in an output of the air-fuel ratio sensor. The abnormality detection unit detects the inter-cylinder air-fuel ratio imbalance abnormality by comparing a value of a parameter that correlates with the degree of variation in the output of the air-fuel ratio sensor with a predetermined abnormality determination value. The abnormality determination value is set individually for each of a plurality of preset operating regions of the internal combustion engine.
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