EXHAUST GAS POST-PROCESSING DEVICE

摘要

When the value (A-value) of the estimated amount of accumulation on a filter for capturing particulate matter reaches a predetermined value A1 corresponding to a predetermined accumulation amount Qm of particulate matter and ash (S12), the filter is forcibly regenerated (S20). Further, when the value (A-value) of the estimation again reaches the predetermined value A1 during an elapsed time after the completion of the forcible regeneration of the filter reaches a predetermined time T1 (S12, S14), it is determined that the amount of ash accumulated on the filter is greater than a specified level (cleaning is required)(S34).