Patent ID: 9027535
Filing Date: 2015-05-12
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A control apparatus for an internal combustion engine, comprising: a port fuel injection valve that injects fuel into an intake port; an exhaust purification catalyst that is arranged in an exhaust passage; an air-fuel ratio sensor that is arranged upstream of the exhaust purification catalyst to detect an actual air-fuel ratio of exhaust gas that is discharged from inside a cylinder of the internal combustion engine; an EGR passage that connects the exhaust passage on an upstream side of the air-fuel ratio sensor with an intake passage; an EGR valve that is responsible for opening and closing the EGR passage; pressure condition determination means that determines whether or not a high intake pressure condition in which a pressure inside the intake passage is higher than a pressure inside the exhaust passage is established; transition condition determination means that determines whether or not a transition condition in which an operational state of the internal combustion engine changes is established; and EGR valve failure determination means that, in a case where the high intake pressure condition and the transition condition are established at a time of a shut-off instruction on shutting off the EGR valve, determines that a shut-off failure of the EGR valve has occurred if an actual measurement value of an air-fuel ratio of exhaust gas that is detected by the air-fuel ratio sensor is a value that is leaner by an amount equal to or greater than a predetermined lean determination value relative to a target value of the air-fuel ratio of the exhaust gas.