| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust gas purification system and an exhaust gas purification method, capable of preventing the adsorption of hydrocarbon on exhaust gas purification units such as catalysts of an exhaust gas purification device, making it possible to constantly maintain the temperature of the exhaust gas purification unit in a controllable state, the exhaust gas purification system feeding hydrocarbon (HC) by means of a post-injection under preset conditions to the upstream side of an exhaust gas purification device which is positioned on the exhaust path of an internal combustion engine, restoring the purifying capacity of the exhaust gas purification device or purifying the exhaust gas of the exhaust gas purification device. <P>SOLUTION: Under hydrocarbon feed conditions, if the combination of the exhaust gas temperature and an exhaust gas flow rate or an intake flow rate during control is deemed to be in a misfire region in which hydrocarbon L which is fed to the exhaust passage no longer combusts in the exhaust gas purification unit, the feed of hydrocarbon L is stopped. <P>COPYRIGHT: (C)2013,JPO&INPIT |
