Patent ID: 11933855
Assignee: HYUNDAI MOTOR COMPANY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H  Y | IPC G  H

Claim 13:
14. A method of measuring an impedance of a fuel cell for a vehicle, the method comprising:
drawing, by a controller, an output of a fuel cell stack and stopping drawing the output of the fuel cell stack when an impedance measurement request is received;
measuring, by the controller, an impedance of an output terminal of the fuel cell stack in a state in which the output of the fuel cell stack is drawn and measuring the impedance of the output terminal of the fuel cell stack in a state in which the drawing of the output of the fuel cell stack is stopped, through an impedance measurement device provided in a fuel cell system, wherein the fuel cell system includes a DC-DC converter configured to control voltages of a high voltage terminal which is connected to at least one of a motor and a peripheral device of the vehicle or a low voltage terminal which is connected to the fuel cell stack; and
calculating, by the controller, the impedance of the fuel cell stack based on the impedance of the output terminal of the fuel cell stack measured in the state in which the output of the fuel cell stack is drawn and the impedance of the output terminal of the fuel cell stack measured in the state in which the drawing of the output of the fuel cell stack is stopped,
wherein the measuring of the impedance by the controller includes: controlling, by the controller, the DC-DC converter in a buck mode and measuring, by the controller, the impedance of the output terminal of the fuel cell stack through the impedance measurement device when the impedance measurement request is received.