| 摘要 |
PURPOSE:To prevent exhaust gas from counterflowing through a bypass passage which also servers as a relief passage, in order to prevent the exhaust gas into a supercharger by stopping the instruction of the exhaust gas into the bypass passage when a shut-off valve opens an intake passage incorporating an intercooler and a shut-off valve closes a part of the bypass passage. CONSTITUTION:A first shut off valve 34 opens and closes an intake passage, upstream of an intercooler 32 but downstream of a part from which a relief passage 12 branches, and a second shut-off valve 35 opens and closes a bypass passage constituting the upstream side of the relief passage 12. An EGR means 39 introduces a part of exhaust gas into the bypass passage 14 downstream of the second shut-off valve, and a control means controls the EGR means 39. When the first and second shut-off valves 34, 35 opens and closes respectively, and the relief valve 25 opens, the introduction of the exhaust gas into the bypass passage 14 is inhibited. Accordingly, it is possible to prevent EGR gas from counterflowing through the bypass passage and flowing into a supercharge 24. |
