| 摘要 |
PROBLEM TO BE SOLVED: To provide a blow-by gas processing device for melting adhered ice by low-pressure EGR gas to prevent the ice from damaging a compressor blade. SOLUTION: When the operation state of an engine 10 is in a first operation state, an electrical control unit 80 opens a low-pressure EGR valve 63, and recirculates low-pressure EGR gas through a low-pressure EGR passage 61. Further, when an outside air temperature is lower than a predetermined outside air temperature threshold value, and a cooling water temperature is lower than a predetermined cooling water temperature threshold value (i.e., the moisture in a blow-by gas tube 70 is highly possible to freeze), the electrical control unit recirculates the low-pressure EGR gas even if the operation state of the engine is not the first operation state. Hence, the vicinity of a connection portion between the blow-by gas tube and the low-pressure EGR passage is heated, and ice generated in the blow-by gas tube is defrosted and removed. As a result, water turned to ice in the blow-by gas tube is prevented from flowing in a compressor 35a. COPYRIGHT: (C)2011,JPO&INPIT |
