Internal combustion engine system

A method for operating an internal combustion engine system, said internal combustion engine system comprising:

• an internal combustion engine comprising a cylinder;
• an air guide arranged to guide air to the cylinder;
• at least one inlet valve adapted to selectively provide a fluid communication between said air guide and said cylinder;
• an inlet valve actuation assembly for actuating said at least one inlet valve, said inlet valve actuation assembly being adapted to actuate said at least one inlet valve in accordance with each one of at least two lift modes during a combustion cycle of said internal combustion engine, wherein:
• a first lift mode of said at least one inlet valve comprising:
• a first opening instance, at which said at least one inlet valve becomes open from a closed position;
• a first maximum lift, and a first closing instance, at which said at least one inlet valve becomes closed;
• a second lift mode of said at least one inlet valve is associated with comprising:
• a second opening instance, at which said at least one inlet valve becomes open from a closed position;
• a second maximum lift, and a second closing instance, at which said at least one inlet valve becomes closed, wherein
• said first opening instance is equal to said second opening instance;
• said first maximum lift is equal to said second maximum lift, and said second closing instance occurs later in said combustion cycle than said first closing instance;
• a turbo comprising a turbine in fluid communication with said cylinder, said turbine comprising a turbine wheel;
• a throttle arrangement arranged between said cylinder and said turbine wheel, as seen in a direction of flow from said cylinder to said turbine wheel, said throttle arrangement being adapted to assume a plurality of different conditions for throttling exhaust gas from said cylinder to said turbine wheel, said plurality of different conditions comprising an open condition with a smallest throttling of said exhaust gas amongst said conditions as well as an at least partially closed condition with a throttling being larger than said smallest throttling,
• said method comprising operating said internal combustion engine system in a first operation mode in which said throttle arrangement is arranged in said at least partially closed condition and said inlet valve actuation assembly actuates said at least one inlet valve according to said second lift mode.