EXHAUST PURIFYING DEVICE FOR INTERNAL COMBUSTION ENGINE

摘要

An exhaust purifying device for an internal combustion engine includes a filter disposed in an exhaust passage for capturing PM. The exhaust purifying device estimates an accumulation amount of the PM accumulated in the filter. The exhaust purifying device performs a regeneration process under the condition that the estimated accumulation amount is greater than or equal to a predetermined regeneration commencement value to regenerate a PM capturing capacity of the filter by varying an operation state of the internal combustion engine to burn and remove the PM, and terminating the regeneration process under the condition that the estimated accumulation amount is less than or equal to a predetermined regeneration termination value. The exhaust purifying device includes at least one of a regeneration process commencement retardation unit and a regeneration process termination retardation unit. The regeneration process commencement retardation unit retards a commencement timing of the regeneration process until an operation state of an accelerator changes. The regeneration process termination retardation unit retards a termination timing of the regeneration process until the operation state of the accelerator is varied.