| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform a suitable rich correction upon the occurrence of variations between air-fuel ratios of multiple cylinders. <P>SOLUTION: With a control apparatus of a multiple cylinder internal combustion engine, external EGR that circulates exhaust gas in an exhaust passage to an intake passage is executed, and an air-fuel ratio is feedback-controlled such that an air-fuel ratio of the exhaust gas comes to match a predetermined target air-fuel ratio. When a rich deviation in which the air-fuel ratio of a portion of cylinders is off to a rich side from the target air-fuel ratio is detected, a parameter IB indicative of an amount of the rich deviation is calculated. The target air-fuel ratio is corrected to the rich side according to the calculated parameter IB. Values Y1, Y2 of parameters at which the rich correction is started are changed according to whether external EGR is being executed. <P>COPYRIGHT: (C)2012,JPO&INPIT |
