| 摘要 |
PROBLEM TO BE SOLVED: To prevent such an erroneous diagnosis that a disturbance of an output of an exhaust gas sensor occurring due to dispersion among cylinders of an engine is determined to be an abnormality of the exhaust gas sensor. SOLUTION: A dispersion value among the cylinders is calculated for each of the cylinders based on behavior of such as an intake pipe pressure detected by an intake pipe pressure sensor 18, and a fuel injection amount and the like is corrected for each of the cylinders based on the dispersion value between the cylinders thereby correcting the dispersion among the cylinders. When the dispersion value between the cylinders exceeds a predetermined value during engine operating, or until correction of the dispersion among the cylinders is completed, it is determined that the disturbance of the output of the exhaust gas sensor 24 occurring due to the dispersion between cylinders is likely to exceed a normal range, thereby prohibiting the abnormality diagnosis of the exhaust gas sensor 24 or alleviating an abnormal determination reference. Accordingly, the erroneous diagnosis such that the disturbance of the output of the exhaust gas sensor occurring due to the dispersion among the cylinders is determined to be abnormality of the exhaust gas sensor is prevented. COPYRIGHT: (C)2004,JPO
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