Method and device for controlling a suction pressure of an internal combustion engine

A method for regulating an intake pressure of an internal combustion engine, having an exhaust gas turbocharger whose compressor is connected to an intake line of the internal combustion engine via an actuating section which has an actuating element for changing a cross section of the actuating section, comprising the acts of:

• acquiring a current intake pressure in the intake line and a compressor pressure of the compressor;
• comparing the acquired current intake pressure and the compressor pressure with setpoint values which correspond to current operating data of the internal combustion engine;
• generating an actuating signal to control the actuating element to change the cross section of the actuating section based on the comparison;
• feeding in compressed air into the actuating section downstream of the actuating element via an additional duct for the regulated, temporary feeding in of compressed air when the current intake pressure is lower than a redetermined minimum intake pressure and the compressor pressure is lower than a predetermined compressor pressure,
• wherein the changing of the cross section of the actuating section is made to make the cross section of the actuating section smaller to prevent compressed air from flowing back into the compressor, and when the feeding in of compressed air ends, the actuating element is adjusted to increase the cross section of the actuating section,
• wherein the intake pressure is acquired by at least one pressure sensor downstream of the actuating element, and the compressor pressure is acquired by a pressure sensor upstream of the actuating element.