Patent ID: 7992383

Claim:
A method for controlling an exhaust gas purification system, comprising: an exhaust gas purification device including an oxidation catalyst device for carrying an oxidation catalyst and a diesel particulate filter device in order from an upstream side in an exhaust passage of an internal combustion engine, or an exhaust gas purification device including a diesel particulate filter device for carrying an oxidation catalyst; index temperature detection means for detecting a catalyst temperature index temperature that indexes the temperature of the oxidation catalyst; a control device for performing regeneration control based on a detection result of the index temperature detection means in order to recover a purification capacity of the diesel particulate filter device, wherein during regeneration control when a vehicle mounted with the internal combustion engine is stopped, a first exhaust gas temperature rise control is performed to make an engine speed of idling to a predetermined first objective engine speed that is higher than the engine speed of idling in a normal operation when a catalyst temperature index temperature is lower than a first determination temperature, and a second exhaust gas temperature rise control is performed to make the engine speed of idling lower than the predetermined first objective engine speed and a predetermined second objective engine speed that is higher than the engine speed of idling in the normal operation when the catalyst temperature index temperature is not less than the predetermined first determination temperature.