Patent ID: 8650859
Filing Date: 2014-02-18
Classification: F01N,Y02T

Abstract:
1. An exhaust gas purification system for an internal combustion engine comprising: an exhaust gas purification device that is arranged in an exhaust passage of the internal combustion engine and including a catalyst; a precatalyst that is arranged in the exhaust passage at a location upstream of said exhaust gas purification device and has an oxidation function; a reducing agent addition valve that is arranged in the exhaust passage at a location upstream of said precatalyst and adds a reducing agent to an exhaust gas when the reducing agent is supplied to said precatalyst and said exhaust gas purification device, wherein said reducing agent addition valve is disposed in a position in which at least part of the reducing agent added to the exhaust gas reaches said precatalyst in the state of liquid; and an electronic control unit including a routine, the routine including