| 摘要 |
<p>PURPOSE:To remove ash components on a filter clogged thereby to prevent decrease the performance of engine by flowing them in the reverse direction at an exhaust filter by the use of an exhaust gas circulation action to an intake system at the time of deceleration at which no particulate is generated just after regeneration of filter. CONSTITUTION:A system main body is composed of a filter 51 for collecting particulate in an exhaust passage 50 of an engine, means 52 for judging the regeneration time of filter, and means 53 for increasing the temperature of exhaust gas at the regeneration of filter. In the above constitution, an exhaust gas circulating passage 56 is connected to an intake passage 55 while being branched from a part between an exhaust gas throttle valve 54 provided at the passage 50 upstream of the filter 51 and the filter 51. A bypass valve 58 is provided at a bypass passage 57 bypassing the exhaust throttle valve 54 of the exhaust passage 50 and the filter 51. Means 59 detects deceleration conditions of engine. The exhaust throttle valve 54 is closed at the time of deceleration after regeneration of filter, and a bypass valve 58 is opened to flow back exhaust gas to the filter 51 with cleaning means 60.</p> |
