| 摘要 |
<p>In an engine exhaust gas purifying apparatus comprising an oxidation catalyst part (12), a NOx catalyst part (11), and a filter (13), the reducing ability of NOx in the NOx catalyst part is not decreased, fuel efficiency is not decreased, and recycling of the filter (13) is reliably carried out. In the exhaust gas purifying apparatus, the oxidation catalyst part (12), the NOx catalyst part (11), and the filter are sequentially arranged along an exhaust passage (6a) of an exhaust gas purifying apparatus main body (6) in a direction from an upstream side to a downstream side. In the exhaust passage (6a), a region located between the downstream side of the oxidation catalyst part (12) and the upstream side of the NOx catalyst part (11) is divided into a first passage (27) for guiding exhaust gas to the NOx catalyst part (11) and a second passage (28) for guiding exhaust gas directly to the filter (13) without involving the NOx catalyst part (11). In addition, a control valve (29) is installed at the exhaust passage. A ratio of the flow rate of exhaust gas at the first passage (27) to the flow rate of exhaust gas at the second passage (28) can be controlled using the control valve (29).</p> |
