Patent ID: 6708484
Filing Date: 2004-03-23
Classification: B01D,F01N,Y02A,Y02T

Abstract:
An exhaust gas purifying system for a vehicle, comprising:a hydrogen enriching device that increases a component ratio of hydrogen with respect to reducing gas components in exhaust gas, the hydrogen enriching device being disposed in an exhaust gas passageway; a NOx treating catalyst disposed downstream of the hydrogen enriching device in the exhaust gas passageway; and a HC trap catalyst disposed downstream of the NOx treating catalyst in the exhaust gas passageway, wherein the exhaust gas flows from the hydrogen enriching device direct to the NOx treating catalyst continuously during operation and a following condition is satisfied: [H2/TR]d&gE;0.3 where [H2/TR]d is a ratio between a hydrogen concentration [H2]d and a total reducing component concentration [TR]d at an inlet to the NOx treating catalyst.