| 摘要 |
<P>PROBLEM TO BE SOLVED: To more appropriately detect inter-cylinder air/fuel ratio imbalance abnormality in a multicylinder internal combustion engine while restraining deterioration of drivability and deterioration of exhaust emission. <P>SOLUTION: An inter-cylinder air fuel ratio imbalance abnormality detection apparatus for a multicylinder internal combustion engine includes a fuel injection amount change control means that executes fuel injection amount change control of forcing a fuel injection amount of a predetermined object cylinder to change by a predetermined amount; an ignition timing retardation control means that executes ignition timing retardation control for the predetermined object cylinder; and a detection means that detects inter-cylinder air/fuel ratio imbalance abnormality based on output fluctuation regarding the predetermined object cylinder occurring when the fuel injection amount change control and the ignition timing retardation control are executed together for the predetermined object cylinder. <P>COPYRIGHT: (C)2013,JPO&INPIT |
