Patent ID: 9109491
Filing Date: 2015-08-18
Classification: F01N,F02D,Y02T

Abstract:
1. An exhaust purification system of an internal combustion engine comprising: an engine exhaust passage; a hydrocarbon feed valve for feeding hydrocarbons arranged inside of the engine exhaust passage; an exhaust purification catalyst for reacting NO a precious metal catalyst carried on an exhaust gas flow surface of the exhaust purification catalyst; a basic exhaust gas flow surface part formed around the precious metal catalyst; a post treatment device that is raised in temperature by a heat of an oxidation reaction of hydrocarbons when hydrocarbons are fed to the post treatment device arranged inside of the engine exhaust passage downstream of the exhaust purification catalyst; and an electronic control unit, wherein the electronic control unit is configured to control a vibration of a concentration of hydrocarbons flowing into the exhaust purification catalyst within a predetermined range of amplitude and within a predetermined range of period, and is configured to control the vibration period of the hydrocarbon concentration longer than the predetermined range of period, wherein