| 摘要 |
PURPOSE:To prevent the generation of surging by suppressing the increase of the pressure ratio before and behind a blower in the initial period of deceleration, by throttling a blower passage after a sufficient quantity of air flows in a bypass passage in deceleration. CONSTITUTION:In low load operation, a throttle valve 21 is maintained in the state where the number of revolution of a turbine is high, by increasing the pressure ratio before and behind a throttle blower 16b, and a bypass passage 19 is opened by opening a bypass valve 20. In deceleration, the bypass valve 20 is immediately opened, and the throttle valve 21 is delay-controlled so that the perfect opened state is maintained for a prescribed time at the initial period of deceleration, and then throttled. In this delay period, a sufficient quantity of air is allowed to pass through the bypass passage 19, and the increase of the pressure ratio before and behind the blower 16b in the throttle operation of the throttle valve 21 is suppressed. |
