Patent ID: 8001774

Claim:
A control method of an exhaust gas purification system having an exhaust gas purification device with an oxidation catalyst device carrying an oxidation catalyst and a diesel particulate filter device arranged in order from an upstream side, or an exhaust gas purification device having a diesel particulate filter device carrying an oxidation catalyst arranged, an index temperature detector for detecting a catalyst temperature index temperature indicating a temperature of the oxidation catalyst, an exhaust throttle valve, an exhaust brake valve in an exhaust passage of an internal combustion engine, and a controller for conducting regeneration control based on a detection result of the index temperature detector in order to recover purification capacity of the diesel particulate filter device, wherein at the regeneration control, while a vehicle with the internal combustion engine mounted is parked, both the exhaust throttle valve and the exhaust brake valve are used, and at the regeneration control, while the vehicle with the internal combustion engine mounted is parked, if the catalyst temperature index temperature is lower than a predetermined first determining temperature, first exhaust gas temperature rise control is conducted where the exhaust brake valve is set to a fully closed side and multiple injection is carried out in in-cylinder fuel injection control, while if the catalyst temperature index temperature is equal to the predetermined first determining temperature or above, second exhaust gas temperature rise control is conducted where the exhaust brake valve is set to an open side, the exhaust throttle valve is set to the fully closed side, and post injection is carried out in the in-cylinder fuel injection control.