A COMPUTER-IMPLEMENTED METHOD FOR DETERMINING A DEGRADATION STATE OF A TURBO AND/OR A HUMIDIFIER OF A FUEL CELL SYSTEM

The invention relates to a computer-implemented method for determining a degradation state of a turbo (20) and/or a humidifier (30) of a fuel cell system (1) for a vehicle (100), the fuel cell system (1) comprising a fuel cell stack (10), in addition to the turbo (20) and the humidifier (30), wherein the method comprises:- obtaining (S1) a fuel cell system efficiency value which corresponds to a measured efficiency decrease of the fuel cell system (1) during use with respect to a first reference efficiency,- obtaining (S2) a fuel cell stack efficiency value which corresponds to a measured efficiency decrease of the fuel cell stack (10) during use with respect to a second reference efficiency, and- determining (S3) the degradation state of the turbo (20) and/or the humidifier (30) based on a difference between the fuel cell system efficiency value and the fuel cell stack efficiency value. The invention also relates to a control unit (40), a fuel cell system (1), a vehicle (100), a computer program and a computer-readable medium.