Abstract: A fuel cell system and a method of controlling the system are provided. The fuel cell system includes: a fuel cell having a plurality of cells to generate power through a reaction between hydrogen supplied to an anode space and oxygen supplied to a cathode space; a power storage device to be charged with power generated by the fuel cell or discharged to supply power; and a controller. The controller recirculates hydrogen, diffused from the anode space to the cathode space, into the anode space by supplying power charged in the power storage device to the fuel cell when the power generation of the fuel cell is stopped. The controller is configured to control whether to supply the power to the fuel cell based on a pressure measured in the anode space and voltages of the cells that constitute the fuel cell.

Abstract: A power plant thermal-management-system control method for controlling thermal management systems in PMCs is provided. The thermal management systems are operated based on coolant temperatures of the PMCs of a power plant of a fuel cell vehicle to prevent the temperatures of the PMCs from deviating from a reference range, which in turn prevents degradation of fuel cells.

Abstract: A power plant thermal-management-system control method for controlling thermal management systems in PMCs is provided. The thermal management systems are operated based on coolant temperatures of the PMCs of a power plant of a fuel cell vehicle to prevent the temperatures of the PMCs from deviating from a reference range, which in turn prevents degradation of fuel cells.

Abstract: A power plant thermal-management-system control method for controlling thermal management systems in PMCs is provided. The thermal management systems are operated based on coolant temperatures of the PMCs of a power plant of a fuel cell vehicle to prevent the temperatures of the PMCs from deviating from a reference range, which in turn prevents degradation of fuel cells.

Abstract: A power plant thermal-management-system control method for controlling thermal management systems in PMCs is provided. The thermal management systems are operated based on coolant temperatures of the PMCs of a power plant of a fuel cell vehicle to prevent the temperatures of the PMCs from deviating from a reference range, which in turn prevents degradation of fuel cells.

Abstract: Disclosed are a method of controlling an operation of a fuel cell and a fuel cell operating system including an air compressor disposed on an air supply line and configured to compress an oxidation gas to be supplied to a fuel cell stack and supply the compressed air to a fuel cell inlet side, an air discharge line configured to discharge the oxidation gas from the fuel cell stack, a bypass line configured to branch off from the air discharge line through a valve, connected to the air supply line, and configured to resupply the discharged oxidation gas to the fuel cell inlet side, and a control unit configured to control a flow rate of the oxidation gas to be supplied to the fuel cell stack by controlling the valve on the bypass line depending on a cell ratio value which is a ratio of the fuel cells each being applied with a voltage lower than a first voltage among the fuel cells.

Abstract: An air supply control method of a fuel cell is provided. The method includes adjusting an opening of a pressure control valve in accordance with an opening map stored in advance. The pressure control valve is disposed at an outlet of a fuel cell of an air supply line for supplying air to the fuel cell and discharging air and adjusts air pressure in the air supply line. The method further includes determining whether an air pressure state of the air supply line is normal after adjusting the opening of the pressure control valve and operating the pressure control valve at a predetermined opening in response determining that the air pressure state of the air supply line is abnormal.

Abstract: A fuel cell purging method is provided to effectively prevent fuel cell deterioration and degradation of durability of the fuel cell by performing hydrogen purging at a point in time at which negative pressure of an anode peaks after a fuel cell vehicle is stopped. The fuel cell purging method includes stopping the driving of a fuel cell vehicle and continuously measuring pressure of an anode of a fuel cell after the fuel cell vehicle is stopped. Additionally, hydrogen is supplied to the anode when the measured pressure of the anode reaches a negative pressure peak time point.

Abstract: A system and method of controlling a performance of a fuel cell stack is provided. In particular, the output performance of the fuel cell stack is determined by comparing the difference between an initial voltage and a voltage after a predetermined time lapses with the difference between the initial voltage and a preset minimum voltage.

Abstract: A fuel cell system includes a fuel cell stack having a cathode and an anode, a humidifier configured to humidify air that is to be supplied to the cathode, an air supply unit configured to supply the air to the humidifier, and a controller. The controller is configured to adjust a flow rate of the air supplied from the air supply unit, based on a supply of the humidifier, to prevent flooding of the fuel cell stack.

Abstract: A voltage control method for a fuel cell stack is provided. The method includes determining whether a performance of the fuel cell stack is degraded based on a reference performance that corresponds to the performance of the fuel cell stack evaluated at a reference time point and an evaluated performance that corresponds to the performance of the fuel cell stack evaluated at a predetermined time point after the reference time point. Additionally, the method includes setting a reference voltage, which is set as a maximum allowable voltage for adjusting a voltage of the fuel cell stack, to be less than an existing reference voltage in response to determining that the performance of the fuel cell stack is degraded.

Abstract: A power plant thermal-management-system control method for controlling thermal management systems in PMCs is provided. The thermal management systems are operated based on coolant temperatures of the PMCs of a power plant of a fuel cell vehicle to prevent the temperatures of the PMCs from deviating from a reference range, which in turn prevents degradation of fuel cells.

Abstract: A fuel cell purging method is provided to effectively prevent fuel cell deterioration and degradation of durability of the fuel cell by performing hydrogen purging at a point in time at which negative pressure of an anode peaks after a fuel cell vehicle is stopped. The fuel cell purging method includes stopping the driving of a fuel cell vehicle and continuously measuring pressure of an anode of a fuel cell after the fuel cell vehicle is stopped. Additionally, hydrogen is supplied to the anode when the measured pressure of the anode reaches a negative pressure peak time point.

Abstract: A fuel cell purging method is provided to effectively prevent fuel cell deterioration and degradation of durability of the fuel cell by performing hydrogen purging at a point in time at which negative pressure of an anode peaks after a fuel cell vehicle is stopped. The fuel cell purging method includes stopping the driving of a fuel cell vehicle and continuously measuring pressure of an anode of a fuel cell after the fuel cell vehicle is stopped. Additionally, hydrogen is supplied to the anode when the measured pressure of the anode reaches a negative pressure peak time point.

Abstract: An air supply control method of a fuel cell is provided. The method includes adjusting an opening of a pressure control valve in accordance with an opening map stored in advance. The pressure control valve is disposed at an outlet of a fuel cell of an air supply line for supplying air to the fuel cell and discharging air and adjusts air pressure in the air supply line. The method further includes determining whether an air pressure state of the air supply line is normal after adjusting the opening of the pressure control valve and operating the pressure control valve at a predetermined opening in response determining that the air pressure state of the air supply line is abnormal.

Abstract: A fuel cell purging control method for controlling hydrogen purge of a fuel cell including a stack having an anode and a cathode, an air supply device having an air supply line supplying air to the cathode of the stack, a back pressure adjusting valve adjusting back pressure of the air supply device, and a hydrogen supply device supplying hydrogen to the anode of the stack, includes steps of: determining hydrogen purge of the fuel cell while the fuel cell is being normally operated, reducing back pressure of the air supply line of the fuel cell when the hydrogen purge is determined, and purging hydrogen in the anode of the fuel cell for a preset period of time after the step of reducing the back pressure.

Abstract: A system and method of controlling a performance of a fuel cell stack is provided. In particular, the output performance of the fuel cell stack is determined by comparing the difference between an initial voltage and a voltage after a predetermined time lapses with the difference between the initial voltage and a preset minimum voltage.

Abstract: A system and method of controlling a performance of a fuel cell stack is provided. In particular, the output performance of the fuel cell stack is determined by comparing the difference between an initial voltage and a voltage after a predetermined time lapses with the difference between the initial voltage and a preset minimum voltage.

Abstract: A control method and system of a fuel cell system is provided. The control method includes detecting, by a controller, a voltage of a fuel cell stack when power generation of a fuel cell is stopped while a fuel cell vehicle is being driven. In addition, hydrogen supply pressure at an anode side is adjusted based on a variation in the detected voltage.

Abstract: A fuel cell system includes a fuel cell stack having a cathode and an anode, a humidifier configured to humidify air that is to be supplied to the cathode, an air supply unit configured to supply the air to the humidifier, and a controller. The controller is configured to adjust a flow rate of the air supplied from the air supply unit, based on a supply of the humidifier, to prevent flooding of the fuel cell stack.