Device for controlling the supercharging pressure of a turbocharger

摘要

A supercharging pressure controller for a turbocharger. The supercharging pressure control device according to the present invention includes a drive device for driving a valve of a variable geometry mechanism which varies the flow area in the exhaust gas channel, a drive device for driving a valve provided in a bypass channel into which the exhaust gas is introduced to bypass the exhaust gas turbine, and a pressure sensor for detecting the supercharging pressure of the inlet air to the internal combustion engine. A control value obtaining device obtains a value for controlling the variable geometry mechanism drive device in accordance with the RPM of the engine and a value of the added load on the engine calculated thereby. A first control device controls the variable geometry mechanism drive device, using a control value obtained by compensating the control value from the control value obtaining means in accordance with a first target supercharging pressure set value and the detected value obtained by the pressure sensor at the time when the engine is in a predetermined operating region. A second control device controls the bypass channel valve drive device, using a control value obtained by compensating the control value from the control value obtaining device in accordance with a second target supercharging pressure set value and the detected value obtained by the pressure sensor at the time when the engine is in another operating region. A cutoff device cuts off the compensating control by the first control device. A recording control device records a compensated value from the second control device and controls the bypass channel valve drive device with the activation of the cutoff device by the recorded compensated value at the time when an abnormality or malfunction of the supercharging pressure detection device is recognized.