| 摘要 |
A supercharging pressure control device for an exhaust gas turbocharger comprises a bypass valve control device which effectively controls the supercharging pressure to correspond to the load on an internal combustion engine when the supercharging pressure downstream from a compressor is higher than a first set value. Further, a velocity control device for exhaust gas flow is positioned between the inlet port of the bypass valve control device and the exhaust gas turbine to control the exhaust gas flow velocity when the supercharging pressure downstream from the compressor exceeds a second set value which is lower than the first set value. A pressure sensor is installed in the downstream side of the compressor in the intake air channel to detect the supercharging pressure. A controller comprising a microcomputer is also provided. Several types of detection means output operating status signals to the controller. A fuel supply means comprising an injection valve is provided. Finally, when the controller detects that the supercharging pressure is above a third set value which is higher than the first and second set values, a fuel shutoff means cuts off the fuel supply from the fuel supply devic, and when this fuel shutoff means determines that the supercharging pressure is below a fixed supercharging pressure lower limit value, it causes the fuel supply means to recommence supplying fuel.
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