Patent ID: 8549843

Claim:
A method of controlling a forced regeneration of an exhaust gas purification system, comprising: providing an exhaust gas purification system with an oxidation catalyst device supporting an oxidation catalyst for raising an exhaust gas temperature in an exhaust gas passage in an internal combustion engine and a diesel particulate filter device for burning and removing a particulate matter by an exhaust gas of which temperature is raised by the oxidation catalyst in the exhaust gas passage; detecting a temperature of the oxidation catalyst; and when a temperature of the oxidation catalyst is detected to be lower than a catalyst activation temperature, conducting a first multi-injection by injection quantities and injection timings for raising the exhaust gas temperature, based on first map data; and when the temperature of the oxidation catalyst is detected to be raised, while conducting the first multi-injection, to be equal to or greater than the catalyst activation temperature, conducting a second multi-injection by injection quantities and injection timings for maintaining the exhaust gas temperature, based on second map data, wherein the injection timings of the second multi-injection occur earlier than the injection timings of the first multi-injection, and wherein a second injection quantity of the second multi-injection is less than a first injection quantity of the first multi-injection.