Patent ID: 6173571
Filing Date: 2001-01-16
Classification: B01D,F01N,F02B,F02D,Y02T

Abstract:
An exhaust gas purifying apparatus for an in-cylinder injection type internal combustion engine, comprising:a fuel injection valve for injecting fuel directly into a combustion chamber at least during a compression stroke to perform a stratified-charge combustion;a NO.sub.x catalyst provided in an exhaust passage of the internal combustion engine, the NO.sub.x catalyst adhering NO.sub.x thereto in an excess oxygen concentration condition and desorbing the NO.sub.x in a reduced oxygen concentration condition; andsulfur component desorption means for desorbing sulfur component from said NO.sub.x catalyst,wherein said sulfur component desorption means injects additional fuel during one of a middle period of an expansion stroke and after the middle period of the expansion stroke after a main injection for said stratified-charge combustion and burns said additional fuel within said combustion chamber to raise an exhaust gas temperature at least to a predetermined temperature to desorb the sulfur component.