SUPERCHARGING PRESSURE CONTROL SYSTEM OF INTERNAL COMBUSTION ENGINE, AND METHOD FOR CONTROLLING SUPERCHARGING PRESSURE IN INTERNAL COMBUSTION ENGINE

摘要

To provide a supercharging pressure control system of an internal combustion engine capable of suppressing deterioration of drivability and also improving supercharging performance of a turbo type supercharging system, and a method for controlling supercharging pressure in an internal combustion engine.SOLUTION: A throttle valve 9 is arranged in an exhaust passage 7 which is downstream of an exhaust manifold 5 and upstream of a turbine 8. A drive device 10 for driving the throttle valve 9 is driven so that opening α of the throttle valve 9 becomes setting opening αc set depending on a control region to which an operation state of an engine 2 belongs, thereby adjusting the opening α of the throttle valve 9. The opening α of the throttle valve 9 is kept at the setting opening αc until the control region to which the operation state of the engine 2 belongs varies.SELECTED DRAWING: Figure 1