EXHAUST PURIFICATION DEVICE FOR ENGINE

摘要

[Problem] To provide an exhaust purification device for an engine capable of purifying exhaust of the engine while preventing the occurrence of misfire in the engine. [Solution] A control device (29) carries out gas fuel injection such that exhaust gas flowing into a catalytic converter (21) reaches a target air-fuel ratio, which is richer than a stoichiometric air-fuel ratio, when removing oxygen stored in the catalytic converter (21) and changes the air-fuel ratio to be leaner than the target air-fuel ratio when an angular velocity variation of a crankshaft (3) detected by a crank angle sensor (26) has reached a predetermined value.