| 摘要 |
PURPOSE:To prevent the occurrence of NOx while excellent ignition and combustion are being secured by recirculating exhaust within an intake passage in a two cycle internal combustion engine with an inter cooler. CONSTITUTION:An EGR control valve 35 is provided for the inside of a recirculation exhaust duct (EGR) 34 connecting an intake duct 25 between a throttle valve 26 and a mechanical supercharger 24 to an exhaust duct 31. An intake duct 23 between the mechanical supercharger 24 and an inter cooler 22 is connected to an intake duct 21 at the downstream of the inter cooler 22 with a bypass passage 50. A bypass control valve 51 is disposed at a branch section between the bypass passage 50 and the intake duct 23. The EGR control valve 35 is made to be opened in a range of EGR gas supply operations determined in advance, and the bypass control valve 51 is concurrently controlled to be at a position indicated by solid lines. On the other hand, the EGR control valve 35 is made to be closed in a range of operations where EGR gas is suspended, and the bypass control valve 51 is concurrently controlled to be at a position indicated by dashed lines. |
