Patent ID: 9468889
Filing Date: 2016-10-18
CPC Classification: B01D,F01N,Y02T

Claim Text:
1. An exhaust gas treatment system, comprising: an exhaust line through which exhaust gas flows; a nitrogen oxide purification catalyst that is disposed at one side of the exhaust line to reduce nitrogen oxide; a diesel particulate filter that is disposed at a downstream side of the nitrogen oxide purification catalyst, filters a particulate material, and eliminates the particulate material in a set condition; and a controller that is configured to control a lean/rich condition of the exhaust gas flowing thorough the exhaust line, wherein a set amount of an oxygen storage material is included in the diesel particulate filter, and wherein the controller is configured to control the exhaust gas to a rich condition to eliminate nitrogen oxide that is absorbed in the nitrogen oxide purification catalyst and configured to return the exhaust gas to a lean condition depending on an oxygen storage amount and a nitrogen oxide absorption amount.