| 摘要 |
<p>An exhaust purification system of an internal combustion engine provided with an NO X storage reduction catalyst 16, an oxidation catalyst 17 which is arranged downstream of the NO X storage reduction catalyst 16, an exhaust gas tank 51 which is connected to the engine exhaust passage between the NO X storage reduction catalyst 16 and the oxidation catalyst 17, and a switching valve 52 which closes the engine exhaust passage toward the oxidation catalyst 17 and makes the exhaust gas flow into the tank 51. When making the air-fuel ratio of the exhaust gas which flows into the NO X storage reduction catalyst 16 rich, the engine exhaust passage toward the oxidation catalyst 16 is shut and the flow path is switched so that the exhaust gas flows to the tank 51 to thereby store the exhaust gas in the tank 51.</p> |
