| 摘要 |
<p>PURPOSE:To prevent a fuel for regeneration from leaking outward as white smoke by returning the exhaust gas, which has passed a filter, to combustion chamber of an engine, at the time of regeneration of the filter, on which particulates collected are burnt, by means of fuel supply to the upper stream of the filter. CONSTITUTION:An exhaust filter 4, which is forced to carry an oxiding catalyzer and used for collecting particulates, is interposed in an exhaust passage 3. A fuel injection valve 5, which supplies fuel (hydrocarbon, carbon monoxide, etc.) into the exhaust gas is provided upstream from this filter 4. In addition, an exhaust throttling valve 7 is installed on downstream from the filter 4, while an exhaust return passage 8, which is branched off from between the filter 4 and the exhaust throttling valve 7, is connected to the lower stream of an intake throttling valve 9 of an intake passage 2. At the same time, a by-path passage 11 is provided in such a manner that it makes a detour round both the filter 4 in the exhaust passage 3 and the exhaust throttling valve 7. In addition, a by-path valve 12 is installed in the midst of the by-path passage 11. At the time of regeneration of the filter 4, the gas which has passed the filter 4 is circulated again through the intake system of the engine.</p> |
