| abstract |
A method for controlling an electrically assisted turbocharger (1,20,30,40,50) is provided. The turbocharger comprises a compressor assembly (3) having a compressor wheel for compressing a fluid to an engine (7), a turbine assembly (2) having a turbine wheel driven by an exhaust gas of the engine (7) and driving the compressor wheel (2), and an electric motor (4) for electrically driving the compressor wheel. Furthermore, at least the turbine assembly (2) comprises a variation means (10,21) for varying an operational condition of the turbine assembly (2). The method comprises the steps of judging that the actual operational condition of the engine (7) requires electrical driving of the compressor wheel, controlling said variation means (10,21) in accordance with a rotational speed of the engine (7) or in accordance with an engine load, and operating the electric motor (4) to drive the compressor wheel in accordance with a target operational condition of the engine 7. |