Internal combustion engine arrangement

An internal combustion engine arrangement, comprising

• an internal combustion engine,
• a turbo arrangement, comprising a turbine arranged in downstream fluid communication with an exhaust manifold of the internal combustion engine, and a compressor mechanically connected to the turbine, the compressor being arranged in upstream fluid communication with an inlet manifold of the internal combustion engine, wherein the turbine comprises a flow control member, the flow control member being configured to controllably adjust a swallowing capacity of the turbine,
• an electric machine operatively coupled to the turbo arrangement for controlling a rotational speed of the turbo arrangement, and
• a control unit, comprising processing circuitry coupled to the electric machine and the flow control member, the processing circuitry being configured to:
• determine a current position of the flow control member of the turbine and a current rotational speed of the turbo arrangement,
• determine a current operating parameter of exhaust gas exhausted from the internal combustion engine, and
• determine, for the turbine, a current operating condition, of a total number of operating conditions operable by the turbine, based on the current position of the flow control member, the current rotational speed of the turbo arrangement, the current pressure level of exhaust gas exhausted from the internal combustion engine upstream the turbine and a current expansion ratio of the exhaust gas in the turbine,
• obtain a predetermined subset of operating conditions exposing the turbine to high cycle fatigue, and in response to the current operating condition forming part of the predetermined subset of operating conditions:
• control the electric machine to adjust the rotational speed of the turbo arrangement, and contemporaneously
• control the flow control member to adjust the swallowing capacity of the turbine,
• such that a subsequent operating condition of the turbine falls outside the predetermined subset of operating conditions in response to the current operating condition forming part of the predetermined subset of operating conditions.