| 摘要 |
An exhaust gas purifying equipment for a diesel engine having a first continuous regeneration type DPF ( 12 ) in an exhaust passage ( 7 ) of an engine ( 2 ), a second continuous regeneration type DPF ( 13 ) in a bypass passage ( 101 ), a switching valve ( 102 ) for switching the flow path of an exhaust gas, an exhaust temperature raising means, an exhaust temperature area detector, and a controller controlling the exhaust temperature raising means and the switching valve ( 102 ), wherein the controller operates the exhaust temperature raising means and at the same time executes the post-injection, and, furthermore, controls the switching valve ( 102 ) so that the exhaust gas passes through the second continuous regeneration type DPF ( 13 ), in the case where the exhaust temperature area of an engine ( 2 ) detected by the exhaust temperature area detector is in an extremely low temperature area (Z 2 ) of which the exhaust temperature is lower than that of a predetermined temperature area. Thereby, even under an environment such as a very cold land, the PM collected by the DPF can be made burn steadily and continuously over the whole operating range of an in-vehicle diesel engine. |
