Patent ID: 8266895

Claim:
An exhaust gas purification system for an internal combustion engine comprising: a plasma generator that produces O 3 , when an operation state of said internal combustion engine is a decelerating operation state in which an engine load becomes lower, to be supplied to exhaust gas of said internal combustion engine by generating a plasma, and that stops producing O 3 when an operation state of the internal combustion engine is an operation state other than the decelerating operation state; an O 3 tank that stores O 3 produced by the plasma generator, and an NOx storage reduction catalyst provided in an exhaust passage of said internal combustion engine, wherein O 3 stored in the O 3 tank is supplied to exhaust gas flowing in an exhaust passage upstream of said NOx storage reduction catalyst when the operation state of said internal combustion engine is an accelerating operation state in which the engine load becomes higher.