Patent ID: 8181449
Filing Date: 2012-05-22
Classification: B01D,F01N,F02D,Y02T

Abstract:
1. A control method of an exhaust gas purification system in an exhaust gas passage of an internal combustion engine, the system provided with an exhaust gas purification device for purifying components in exhaust gas, and a regenerative controller that conducts a regenerative control, including a post injection of fuel in an in-cylinder fuel injection control, for recovering a purification ability of the exhaust gas purification device, the method comprising the steps of: storing pre-set map data based on an operating condition of the engine including a primary fuel injection quantity as a parameter; during the regenerative control, determining whether a temperature of the exhaust gas exceeds a predetermined determination temperature and, if so, executing a regeneration state maintenance control including the post injection of fuel and exhaust gas throttling; also, during the regenerative control, calculating an injection quantity of the post injection of fuel based on the pre-set map data; accumulating this calculated injection quantity, thereby calculating a post injection accumulated injection amount of fuel; when the accumulated injection amount of fuel exceeds a predetermined value, stopping the post injection of fuel; determining that the regenerative control has stopped; and resetting the accumulated injection amount to zero.