Patent ID: 7628010
Filing Date: 2009-12-08
Classification: F01N,F02D,Y02T

Abstract:
1. An exhaust purification system, comprising: an oxidation catalyst disposed in an exhaust passageway of an engine; a filter disposed downstream of said oxidation catalyst in said exhaust passageway; an outlet temperature setting device for setting, as an outlet target temperature, a target value for an exhaust temperature, the outlet target temperature being a predetermined temperature at which particulate matter is burned at an outlet side of the filter; a heat loss quantity computing device for computing a heat loss quantity radiated from said filter to outside said exhaust passageway when exhaust discharged from said engine passes through said filter; and an inlet temperature setting device for setting, as an inlet target temperature on an upstream side of said filter, the inlet target temperature being obtained by adding a loss temperature reduced by said heat loss quantity to said outlet target temperature; an outside air temperature detecting device for detecting a temperature outside said exhaust passageway as an outside air temperature; an exhaust flow quantity computing device for detecting or computing a flow quantity of said exhaust discharged from said engine; and a vehicle speed detecting device for detecting a travel speed of said vehicle, wherein said heat loss quantity computing device computes said heat loss quantity based on said outside air temperature, said exhaust flow quantity, and said travel speed.