Method and device for operating a turbocharger

The operating method has a bypass flow (B) provided across the compressor (14) of the turbocharger, connected to the air intake channel of the IC engine, when a reduced pressure is obtained between the compressor and the throttle plate (36), relative to the pressure in the air intake line (26). The bypass flow is re-combined with the main flow (A) ahead of the throttle plate. Also included are Independent claims for the following; (a) an operating device for an exhaust gas turbocharger for an IC engine; (b) an exhaust gas turbocharger for an IC engine; (c) an IC engine provided with an exhaust gas turbocharger