Patent ID: 7934372
Filing Date: 2011-05-03
Classification: B01D,F01N,F02D,Y02T

Abstract:
1. An exhaust gas purification system comprising an exhaust gas purification device having an oxidation catalyst device carrying an oxidation catalyst and a diesel particulate filter arranged in order from an upstream side or an exhaust gas purification device having a diesel particulate filter carrying an oxidation catalyst and a regeneration control device for conducting control of forced regeneration of the diesel particulate filter arranged in an exhaust passage of an internal combustion engine, in which at forced regeneration of the diesel particulate filter, when a catalyst temperature index temperature indicating a temperature of the oxidation catalyst becomes equal to a predetermined determining temperature or above, the regeneration control device conducts control of raising a temperature of the diesel particulate filter by supplying an unburned fuel to the upstream side of the oxidation catalyst to oxidize the unburned fuel by the oxidation catalyst, wherein: the regeneration control device sets a minimum value of a first upper limit value acquired by subtracting a fuel injection amount for in-cylinder combustion from a first combustible fuel amount limited by an air/fuel ratio and a second upper limit value acquired by subtracting the fuel injection amount for in-cylinder combustion from a second combustible fuel amount limited by an atmospheric pressure as an upper limit value for the unburned fuel supply amount.