Exhaust purification system

摘要

An exhaust purification system having an oxidation catalyst (4) interposed in an exhaust pipe portion (11) that is a part of an exhaust pipe of an internal combustion engine; an in-pipe fuel injection valve (7) that is set on an exhaust upstream side of the oxidation catalyst (4) and injects fuel to be supplied to the oxidation catalyst (4); and a channel portion (20) that is interposed between the in-pipe fuel injection valve (7) and the exhaust pipe (11), diverges outwardly from the exhaust pipe (11), and allows the fuel injected from the in-pipe fuel injection valve (7) to pass inside. There is provided a protruding end (20b) that extends from a portion located on an exhaust upstream side of a connection between the channel portion (20) and the exhaust pipe (11) towards the inside of the exhaust pipe (11) located on an exhaust downstream side so as to draw away from the connection.