| 摘要 |
<p>Disclosed is an internal combustion engine exhaust purifying device that can regenerate the exhaust purifying filter with high efficiency without reducing mileage. The exhaust purifying device of an engine (1) is provided with a supercharger (8), a DPF (32), an oxidation catalyst (31), a high pressure EGR path (6) that recirculates a portion of the upstream exhaust from a turbine (81) into an intake tube (2), a high pressure EGR valve (11) and a high pressure EGR control unit (43) that control the flow of the exhaust that is recirculated via the high pressure EGR path (6), a low pressure EGR path (10) that recirculates a portion of the downstream exhaust from the DPF (32) into the intake tube (2), a low pressure EGR valve (12) and a low pressure EGR control unit (44) that control the flow of the exhaust that is recirculated via the low pressure EGR path (10), an exhaust temperature sensor (22) that detects the temperature of the exhaust, and an EGR switching unit (45) that switches between exhaust recirculation control by the high pressure EGR control unit (43) and exhaust recirculation control by the low pressure EGR control unit (44) according to values detected by the exhaust temperature sensor when it is determined to be a period when the PM collected in the DPF will be burned.</p> |
