초록 ▼

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 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.

대표청구항 ▼

An internal combustion engine comprising: an exhaust gas turbocharger means, comprising a compressor means and an exhaust gas turbine means for rotating said compressor means, for supercharging intake air to the internal combustion engine; a fuel supply means having an injection valve means for inje

An internal combustion engine comprising: an exhaust gas turbocharger means, comprising a compressor means and an exhaust gas turbine means for rotating said compressor means, for supercharging intake air to the internal combustion engine; a fuel supply means having an injection valve means for injecting fuel; a bypass channel means for permitting exhaust gas to bypass said exhaust gas turbine; a supercharging pressure control device means for controlling a supercharging pressure downstream of said compressor means in conformance with an engine comprising: a bypass control valve means for increasing the flow of exhaust gas to pass through said bypass channel means when the supercharging pressure downstream of said compressor means exceeds a first set value; a velocity control device means for controlling the exhaust gas flow comprising a throttle valve means for decreasing a velocity of the exhaust gas flowing through said exhaust gas turbine when the supercharging pressure downstream of said compressor means exceeds a second set value less than said first set value; a pressure sensor means for detecting the supercharging pressure downstream from said compressor means; and a controller comprising a fuel cutoff control means for de-activating said fuel supply means when said pressure sensor means detects a rise in supercharging pressure above a third set value greater than said first set value, and for re-activating said fuel supply means when said pressure sensor means detects a reduction in the supercharging pressure below a fourth set value less than said first set value.