Patent ID: 11888192
Assignee: KIA CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  H  Y | IPC B  H

Claim 11:
12. A method of diagnosing a fuel cell system, the method comprising:
controlling, via a power control unit, a fuel cell stack to generate power when the fuel cell stack is requested to be diagnosed;
controlling an output current of the fuel cell stack to a predetermined current;
sensing, via a voltage sensing unit, a voltage of the fuel cell stack or voltages of a plurality of cells included in the fuel cell stack in the state in which the output current of the fuel cell stack is the predetermined current; and
diagnosing, via a diagnosing unit, a degraded state of the fuel cell stack based on the voltage of the fuel cell stack or the voltages of the plurality of cells;
wherein the predetermined current comprises a plurality of currents determined by a maximum output current outputted in an End of Life (EOL) state of the fuel cell stack.