CONTROL APPARATUS FOR AN INTERNAL COMBUSTION ENGINE

摘要

In a control apparatus for an internal combustion engine in which an SCR catalyst is arranged in an exhaust passage, a dummy determination processing to determine whether the selective catalytic reduction catalyst is mounted at a location is carried out, based on a temperature difference between a temperature of exhaust gas flowing into the location where the selective catalytic reduction catalyst is to be arranged and a temperature of exhaust gas flowing out of the location, after starting of the internal combustion engine, wherein when a period of time for the temperature of the selective catalytic reduction catalyst to become equal to or less than a fixed temperature is equal to or more than a predetermined period of time, the dummy determination processing is carried out, whereas when the period of time is less than the predetermined period of time, the dummy determination processing is not carried out.

主权项

1. A control apparatus for an internal combustion engine comprising:
an upstream side temperature detection unit that detects a temperature of exhaust gas flowing into a location where a selective catalytic reduction catalyst is to be arranged in an exhaust passage of the internal combustion engine; a downstream side temperature detection unit that detects a temperature of exhaust gas flowing out of the location where the selective catalytic reduction catalyst is to be arranged in the exhaust passage of the internal combustion engine; and a determination unit that carries out dummy determination processing to determine whether the selective catalytic reduction catalyst is mounted at said location, based on a parameter correlated with a temperature difference between the temperature measured by said upstream side temperature detection unit and the temperature measured by said downstream side temperature detection unit after starting of the internal combustion engine; wherein said determination unit carries out said dummy determination processing, when a period of time for the temperature of said selective catalytic reduction catalyst to become equal to or less than a fixed temperature in a period of time from the last stop of the internal combustion engine to the current starting thereof is equal to or larger than a predetermined period of time, but does not carry out said dummy determination processing, when the period of time for the temperature of said selective catalytic reduction catalyst to become equal to or less than the fixed temperature is less than said predetermined period of time.