Methods and systems for air flow control

Methods and systems for air flow control in an engine system to be provided which includes a throttle turbine generator with a turbine and a turbine generator. In one example, a method may include adjusting an angle of a throttle which is positioned in an engine intake on the basis of a desired air flow include, by the effects are recognized on the throttle angle due to the rotational movement of the turbine, whereby the air flow accurately controlled in the engine system becomes. The method may further include a prediction of an air flow into the engine system based on the position of the throttle, whereby the torque of the engine system is closely monitored.