| 摘要 |
It is an object of the present invention to make an improvement of a fuel consumption and an avoidance of an engine oil dilution compatible, at the time of renewal of an exhaust gas purification device 50. An exhaust gas purification system of the present invention is provided with the exhaust gas purification device 50 which is arranged in an exhaust gas route 77 of a common rail type engine 70, and at least one of an intake air throttle device 81 and an exhaust gas throttle device 82 which are arranged in intake and exhaust systems 76, 77 of the engine 70. The exhaust gas purification system executes an auxiliary renewing mode which raises a temperature of an exhaust gas from the engine 70 by actuating at least one of the intake air throttle device 81 and the exhaust gas throttle device 82 in the case that a clogged state of the exhaust gas purification device 50 becomes equal to or more than a prescribed level. The exhaust gas purification system executes a forced renewing mode which supplies a fuel into the exhaust gas purification device 50 by a post injection E in the case that the clogged state of the exhaust gas purification device 50 is not improved even by executing the auxiliary renewing mode. |
