| 摘要 |
A device for purifying exhaust gas of a diesel engine comprising a first continuous regeneration type diesel particulate filter (DPF) (12) arranged in the exhaust gas passage of the engine, a second continuous regeneration type DPF (13) having a capacity smaller than the capacity of the first continuous regeneration type DPF (12) and disposed in the exhaust gas passage on the upstream side thereof, a bypass (20) arranged to surround the outer peripheral portion of the second continuous regeneration type DPF (13), a control valve (22; 26) for opening and closing the bypass (20), an exhaust gas temperature region-detecting means for detecting the exhaust gas temperature region of the engine, and a control means (10) for so controlling the control valve (22; 26) as to close the bypass (20) when the exhaust gas temperature region of the engine is in a low temperature region lower than a predetermined temperature. <IMAGE> |
