EXHAUST EMISSION CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control device for internal combustion engine in which a NOX absorbent is arranged in the engine exhaust system, whereby poisoning of the NOX absorbent with oxides can certainly be eliminated while unnecessary deterioration of the NOX absorbent is precluded. SOLUTION: The exhaust emission control device of internal combustion engine is equipped with a NOX absorbent arranged in the engine exhaust passage, storing nitrogen oxides when the oxygen concentration of the inflowing exhaust gas is high and emitting the nitrogen oxides when the oxygen concentration has lowered, and a poisoning eliminating means to execute poisoning eliminating process for NOX absorbent when necessity has arisen for eliminating poisoning of the NOX absorbent with oxides while the engine is in the decelerative operation and in idling condition.