| 摘要 |
<p>PURPOSE:To enable regeneration for good fuel consumption efficiency when a trap is regenerated by injecting fuel into an engine combustion chamber at the end of engine expansion stroke or during exhaust stroke, and supplying very combustible activated fuel to the trap with a catalyst through an oxidation catalyst. CONSTITUTION:An oxidation catalyst 51 and a trap with a catalyst 52 to scavenge particulates are interposed serially in the exhaust passage 50 of an internal combustion engine, and further a bypass passage 53 that detours the trap 52 is provided. When the trap is regenerated, a bypass control means 56 whereinto the signal of a temperature detection means 55 is input controls so that a bypass valve 54 is closed when exhaust temperature is within a specified range of temperature lower than the trap regeneration temperature and higher than that, and opened at the time other than that. Also, fuel is injected by a fuel injection device 58 at the end of engine expansion stroke or during exhaust stroke when the exhaust temperature is within the specified range of temperature by a regenerated fuel control means 57, as well as its injection volume is controlled to increase or decrease in response to exhaust temperature.</p> |
