Patent ID: 8141344
Filing Date: 2012-03-27
Classification: F01N,F02D,Y02T

Abstract:
1. A control apparatus of an internal combustion engine provided with a plurality of cylinder groups, comprising: an individual exhaust passage connected to each cylinder group; a common exhaust passage connecting the individual exhaust passages; a first catalyst provided in each of the individual exhaust passages; a second catalyst provided in the common exhaust passage; and an exhaust control portion that controls a state of exhaust gas flowing into the first catalysts and the second catalyst, wherein when control of an operating state of the internal combustion engine is switched, the exhaust control portion controls the state of the exhaust gas such that an oxygen storage capacity of at least one catalyst of the first catalysts and the second catalyst becomes a predetermined oxygen storage capacity, wherein the exhaust control portion is an air-fuel ratio control portion that controls an air-fuel ratio of each of the cylinder groups independently, and when the air-fuel ratio control portion switches from a fuel cut control that stops fuel from being supplied to all of the cylinder groups to a cylinder group-specific control that makes the air-fuel ratio of one cylinder group rich and makes the air-fuel ratio of another cylinder group lean, the air-fuel ratio control portion sets the air-fuel ratio of the one cylinder group and the air-fuel ratio of the other cylinder group such that the air-fuel ratio of the common exhaust passage becomes rich for a predetermined period of time.