Patent ID: 7165394
Filing Date: 2007-01-23
Classification: B01D,F01N,F02B,F02D,Y02T

Abstract:
1. An exhaust gas purification system for an internal combustion engine, having an exhaust gas purification device having the property of occluding SOx in an exhaust gas emitted from said internal combustion engine and collecting particulate matter contained in the exhaust gas, said system comprising: a collection amount estimation device that estimates an amount of particulate matter collected in said exhaust gas purification device; a collection ability regeneration control device that controls the temperature of said exhaust gas purification device to be a first predetermined temperature when the amount of collected particulate matter estimated by said collection amount estimation device exceeds a predetermined amount of collection; an SOx poisoning recovery control device that controls the temperature of said exhaust gas purification device to be a second prescribed temperature, and at the same time controls the air-fuel ratio of the exhaust gas flowing into said exhaust gas purification device to be a predetermined rich-side air-fuel ratio when the SOx occluded in said exhaust gas purification device are released; an SOx release determination device that determines whether a load of the internal combustion engine falls within an SOx release load range in which the SOx occluded in said exhaust gas purification device can be released by said SOx poisoning recovery control device; and an SOx release device that interrupts the control of said collection ability regeneration control device and performs the control of said SOx poisoning recovery control device when the temperature of said exhaust gas purification device is controlled to be said first predetermined temperature by means of said collection ability regeneration control device, and when said SOx release determination device makes a determination that the load of the internal combustion engine falls within said SOx release load range.