Internal combustion engine exhaust gas purifying system

摘要

An internal combustion engine exhaust gas purifying system ( 10 ) having a continuous regenerating diesel particulate filter system ( 3 ) on the exhaust passage ( 2 ) of an internal combustion engine ( 1 ) is constituted by including collected-quantity estimation means ( 5 A) for estimating the quantity of collected particulate matter in a filter ( 3 b) of the filter system for collecting the particulate matter and maximum-fuel-injection-quantity restricting means ( 5 C) for restricting the maximum fuel injection quantity of the internal combustion engine ( 1 ) when the quantity of collected particulate matter estimated by the collected-quantity estimation means ( 51 A) is equal to or more than a predetermined judgment value. Thereby, when the quantity of deposited particulate matter exceeds a predetermined value in the continuous regenerating DPF system ( 3 ), it is possible to prevent the continuous regenerating DPF system ( 1 ) from deteriorating by restricting the maximum fuel injection quantity of the internal combustion engine ( 1 ) and avoiding a great increase of an exhaust gas quantity.