| 摘要 |
PURPOSE:To prevent rapid reduction of supercharging pressure even at the time of by setting valve opening/closing characteristic of each actuator emer gency itself so as to open an exhaust switching valve, close an intake bypass valve, and open an intake switching valve in order, in compliance with increas ing of operating pressure. CONSTITUTION:Valve opening/closing characteristic of each of actuators 16, 10, 11 itself is set so as to open an exhaust switching valve 17, close an intake bypass valve 33, and open an intake switching valve 18 in order, in compliance with increasing of actuator operating pressure. It is thus possible to prevent rapid reduction of supercharging pressure, since each of vales 17, 33, 18 is opened/closed while obeying regular formula even if any trouble is generated on a pressure transfer piping. |
