| 摘要 |
PURPOSE:To smoothly vary the opening degree at the early period in opening a bypass valve by controlling the opening degree in correspondence with the air flow rate and the engine revolution speed. CONSTITUTION:When an exhaust bypass valve 22 is opened, the pressure of a low pressure compressor 3 increases gradually, and the pressure is increased by opening a flow-rate adjusting valve 12. As the flow-rate adjusting valve 12 is opened, an exhaust bypass valve 22 is closed gradually. When the flow-rate adjusting valve 12 is opened perfectly, a variable nozzle 15 is opened. Into a control unit 26, the number Ne of revolution of an engine 1, supercharge pressure PB in a suction pipe 18, and the air flow rate QA metered by an air flow meter 25 are input as the detection signals, and the control signals are supplied into the control-pressure adjusting valve 16A and 17A for the actuators 16 and 17. |
