| 摘要 |
PROBLEM TO BE SOLVED: To restrict non-required bypass of exhaust gas at a high pressure stage turbo without using any electronic control.SOLUTION: An engine 1 with two-stage supercharger turbo comprises a high-pressure stage turbo 50 and a low-pressure stage turbo 51. This engine further comprises a bypass flow passage 2e for bypassing the exhaust gas at an upstream side of the high-pressure stage turbo 50 to a downstream side of the high-pressure stage turbo 50; a bypass valve 20 arranged at the bypass flow passage 2e; a shut-off valve 22 having the first actuator 21 to which the first fed gas super-charged with the high-pressure stage turbo 50 is supplied and the bypass valve 20 is opened by pressure of the first supplied gas, the first actuator being arranged between the flow passage 21b and the flow passage 21c for supplying the first supplied gas to the first actuator 21; and the second actuator 23 to which the second gas supercharged by the low pressure stage turbo 51 is supplied and when the pressure of the second supplied gas is less than the second set pressure P2, the shut-off valve 22 is closed.SELECTED DRAWING: Figure 1 |
