CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

A control apparatus for an internal combustion engine according to an embodiment of the present invention (present apparatus) determines, based on an output value of the downstream air-fuel ratio sensor 67, which a target air-fuel ratio being a target value of an air-fuel ratio of a gas flowing into the catalyst 43 should be set to either a "target rich air-fuel ratio smaller than the stoichiometric air-fuel ratio" or a "target lean air-fuel ratio larger than the stoichiometric air-fuel ratio", and determines a fuel injection amount based on the target air-fuel ratio. The present apparatus comprises an evaporated fuel purge section for introducing an evaporated fuel generated in a fuel tank 51 into an intake passage of the engine. The evaporated fuel purge section starts the evaporated fuel purge when the target air-fuel ratio is set to the target rich air-fuel ratio at a purge execution request condition satisfied time point at which a state has changed from a state in which the purge execution request condition is unsatisfied to a state in which the purge execution request condition is satisfied, and does not start the evaporated fuel purge when the target air-fuel ratio is set to the target lean air-fuel ratio at the purge execution request condition satisfied time point.