EXHAUST GAS PURIFICATION SYSTEM AND EXHAUST GAS PURIFICATION METHOD FOR INTERNAL COMBUSTION ENGINE

摘要

In an exhaust gas purification system for an internal combustion engine that includes an exhaust gas purification catalyst disposed in an exhaust passage in the internal combustion engine and a reducing agent addition valve disposed upstream the exhaust gas purification catalyst in the exhaust passage for injecting a reducing agent in a direction across an exhaust gas flow, the reducing agent addition valve supplies a reducing agent in such a manner that makes a diameter of an agent particle away from the reducing agent addition valve larger than a diameter of an agent particle in the vicinity of the reducing agent addition valve.