EXHAUST PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE

Provided is an exhaust purification device for an internal combustion engine, wherein the operation of an internal combustion engine can be prevented from being maintained when a particulate filter is melted. An exhaust purification device (1) for an internal combustion engine (2) is comprised of a particulate filter (10); a downstream-side temperature sensor (20a) which detects a downstream-side exhaust temperature (T1); a filter temperature sensor (20b) which detects a filter temperature (T10); an exhaust differential pressure detection device (21) which calculates an exhaust differential pressure (P(n)) between an upstream-side exhaust pressure (p1) and a downstream-side exhaust pressure (p2) at predetermined time intervals; a notification device (40); and an ECU (30) which controls the internal combustion engine (2). In the exhaust purification device (1), a differential pressure variation (dP) is calculated on the basis of a first exhaust differential pressure (P(n-1)) and a second exhaust differential pressure (P(n)) after the elapse of a predetermined period of time. When the differential pressure variation (dP) is equal to or larger than a reference variation (Ps) or the downstream-side exhaust temperature (T1) remains equal to or larger than an exhaust reference temperature (T1s) for a period of time equal to or longer than a reference period of time (ts), a demand to stop operating the internal combustion engine (2) is notified, or the operation is stopped.