| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an failure detection device of an internal combustion engine that can detect a variation failure of an inter-cylinder air/fuel ratio irrespective of a state that the supply of fuel is cut and a state that the engine is under cylinder cut-off control. <P>SOLUTION: A control device of the internal combustion engine can detect an air/fuel ratio of the exhaust gas of the engine by an air/fuel ratio sensor which is attached to an exhaust pipe assembly of a multi-cylinder engine, and detects the air/fuel ratio. The control device includes a multi-cylinder air/fuel ratio calculator which partially operates average air/fuel ratios of amounts of the plurality of cylinders which are continued during normal operation by combining all the cylinders, compares the average air/fuel ratios of injection amounts of the plurality of cylinders which are obtained by the multi-cylinder air/fuel ratio calculator, determines the variation failure of the inter-cylinder air/fuel ratio, and also performs correction. <P>COPYRIGHT: (C)2012,JPO&INPIT |
