EXHAUST GAS TREATMENT SYSTEM FOR ENGINE

In order that in manual regeneration control for regenerating a particulate removal filter by increasing the engine rotation speed, the increase of the engine rotation speed can be suppressed while the exhaust gas temperature required to regenerate the particulate removal filter is maintained, disclosed is an exhaust gas aftertreatment system (10) for an engine (100) in which the target engine rotation speed (Nem) is set to a first set value (Nel) when a regeneration instruction signal from a manual regeneration switch (70) is received. When, although the engine rotation speed (Ne) falls within a predetermined engine rotation speed range including the first set value (Nel) that is the target engine rotation speed (Nem) for a predetermined period of time, the exhaust gas temperature (The) does not reach the regeneration temperature (Th1) of the filter within the predetermined period of time, the target engine rotation speed (Nem) is repeatedly reset by being increased from the first set value (Nel) by a predetermined rotation speed.