Patent ID: 9212585
Filing Date: 2015-12-15
Classification: F01N,Y02T

Abstract:
1. An exhaust gas purifying apparatus for an internal combustion engine, comprising: a first catalyst which is disposed in an exhaust passage of the internal combustion engine; a second catalyst which is disposed in the exhaust passage on a downstream side of the first catalyst; an exhaust addition injector disposed on an upstream side of the first catalyst and which is configured to supply a reducing agent into the exhaust passage; a temperature sensor configured to detect a bed temperature of the second catalyst, wherein the second catalyst has oxygen storage capacity, an electronic control unit programmed to: control the exhaust addition injector such that an air-fuel ratio on the upstream side of the first catalyst becomes momentarily rich, and determine a supply amount of the reducing agent by the exhaust addition injector on the basis of the detected bed temperature such that the reducing agent reacts with oxygen released from the second catalyst in a particular region out of a plurality of regions of the second catalyst which are arranged in a direction from the upstream side to the downstream side of the exhaust passage.