Patent ID: 6769245
Filing Date: 2004-08-03
Classification: F01N,F02B,F02D,F02M

Abstract:
An exhaust gas purification method comprising:carrying, on a particulate filter for removing particulate in exhaust gas discharged from a combustion chamber, an active oxygen release agent for taking in oxygen and holding oxygen when there is excess oxygen in surroundings and releasing the held oxygen in the form of active oxygen when the concentration of oxygen in the surroundings fall; maintaining an air-fuel ratio of the exhaust gas flowing into the particulate filter normally lean and occasionally switching it temporarily to rich to promote an oxidation reaction of the particulate on the particulate filter by the active oxygen released from the active oxygen release agent when the air-fuel ratio of the exhaust gas is switched to rich; and removing by oxidation the particulate on the particulate filter without emitting a luminous flame.