Particulate matter filter and regeneration method for particulate matter filter

摘要

In a particulate matter filter (3) that is provided in an exhaust passage (2) of an internal combustion engine (1) and that traps particulate matters in exhaust gas discharged from the internal combustion engine (1) when the exhaust gas passes through a wall portion (3a), a catalyst that has an ability to store oxygen is not arranged in the exhaust passage (2) upstream of the particulate matter filter (3), and a catalyst (4) that has the ability to store oxygen is coated on a downstream side surface of the wall portion (3a) of the particulate matter filter (3).