Patent ID: 9097167
Filing Date: 2015-08-04
Classification: B01D,F01N,F02D,F02N,Y02T

Abstract:
1. An exhaust gas purification device of an internal combustion engine, comprising: 1) a fuel supply device for supplying fuel to a combustion chamber; 2) an exhaust passage communicating with said combustion chamber; 3) a catalyst positioned in said exhaust passage for purifying a component included in exhaust gas, wherein said catalyst comprises: an active element for activating an oxidation reaction or a reduction reaction of said component, and a composite oxide which carries said active element, said active element transforming into said composite oxide as a solid solution when a temperature of said catalyst is higher than or equal to a predetermined solid solution temperature and an atmosphere of an interior of said catalyst is an oxidation atmosphere, and said active element precipitating from said composite oxide when said temperature is higher than or equal to a predetermined precipitation temperature and said atmosphere is a reduction atmosphere; and 4) a catalyst temperature detection device for detecting a temperature of said catalyst, said exhaust gas purification device including an electronic control unit programmed to perform at least one of a first control and a second control, said first control being programmed to: a) set a temperature lower than a base inhibiting temperature as a predetermined inhibiting temperature when a use degree of said catalyst is smaller than or equal to a first predetermined degree; b) inhibit said fuel supply device from stopping a supply of said fuel to said combustion chamber when said catalyst temperature is higher than or equal to said predetermined inhibiting temperature; and c) permit said fuel supply device to stop said supply of said fuel to said combustion chamber when said catalyst temperature is lower than said predetermined inhibiting temperature, and said second control being programmed to: d) set a temperature higher than a base permitting temperature as a predetermined permitting temperature when said use degree is smaller than or equal to said first predetermined degree; e) permit said fuel supply device to increase an amount of said fuel supplied to said combustion chamber beyond a base fuel supply amount when said catalyst temperature is higher than or equal to said predetermined permitting temperature; and f) inhibit said fuel supply device from increasing said amount of said fuel beyond said base fuel supply amount when said catalyst temperature is lower than said predetermined permitting temperature.