Patent ID: 7357901
Filing Date: 2008-04-15
Classification: F01N,Y10S

Abstract:
1. An exhaust gas purification device for an internal combustion engine in which a reducing agent supply means is disposed on an exhaust passage for supplying a droplet-like reducing agent to a NOx storage reduction catalyst, which serves to occlude and reduce NOx components in an exhaust gas, from its upstream side, so that NOx components held in said NOx catalyst are reduced and purified by the reducing agent supplied thereto by said reducing agent supply means, said device being characterized by comprising: a determination means for determining whether the droplet-like reducing agent supplied by said reducing agent supply means has spread to at least a predetermined range; and an adjustment means for adjusting a flow rate of the exhaust gas sent to said NOx catalyst; wherein the flow rate of the exhaust gas is decreased by said adjustment means when said determination means makes a determination that said reducing agent has spread.