Exhaust gas purification device of internal combustion engine

An exhaust gas purification device of an internal combustion engine in which a particulate filter for removing by oxidation particulate in an exhaust gas discharged from a combustion chamber is arranged in an engine exhaust passage and in which a flow velocity instantaneous increasing means is provided for increasing the flow velocity of exhaust gas flowing through the particulate filter for just an instant in a pulse-like manner when the particulate deposited on the particulate filter should be separated from the particulate filter and discharged outside of the particulate filter,

• wherein the particulate filter includes the function of removing by oxidation any particulate in exhaust gas flowing into the particulate filter without emitting a luminous flame when the amount of particulate discharged from the combustion chamber per unit time is smaller than the amount of particulate removable by oxidation on the particulate filter which can be removed by oxidation per unit time without emitting a luminous flame and of absorbing a NOx in the exhaust gas when an air-fuel ratio of the exhaust gas flowing into the particulate filter is lean and releasing the absorbed NOx when an air-fuel ratio of the exhaust gas flowing into the particulate filter becomes a stoichiometric air-fuel ratio and at least one of the amount of discharged particulate or the amount of particulate removable by oxidation is controlled so that the amount of discharged particulate becomes smaller than the amount of particulate removable by oxidation at the time of an operating state of the engine where the amount of discharged particulate can become smaller than the amount of particulate removable by oxidation.