A control device of fuel cell system includes an anode gas circulation flow rate control unit configured to control the anode gas circulation flow rate on the basis of the wet/dry state of the electrolyte membrane detected by the wet/dry state detecting unit, a priority setting unit configured to set priority levels of a normal manipulation to a plurality of physical quantities manipulated by the wet/dry state control unit, and the anode gas circulation flow rate control unit includes an anode gas circulation flow rate limiting unit configured to limit a change rate per unit time of the anode gas circulation flow rate during a transient operation for changing the wet/dry state of the electrolyte membrane, and a control quantity compensating unit configured to, if the change rate is limited, compensate an insufficiency in a control quantity of the wet/dry state due to the limitation of the anode gas circulation flow rate, the compensation being carried out by manipulating a physical quantity with a lower priority level of the normal manipulation than a priority level of the normal manipulation of the anode gas circulation flow rate set by the priority setting unit.

A method for adjusting an output of a fuel cell system is capable of estimating a dry state of a fuel cell vehicle by comparing air flow rates, and adjusting a maximum output applicable to the fuel cell vehicle, thus enabling the fuel cell vehicle to be stably driven. The method for adjusting the output of the fuel cell system includes comparing an air flow rate required for driving and an actually introduced air flow rate to calculate an average air flow rate, and calculating an available output of the vehicle using preset mapping data with respect to the average air flow rate.

A fuel cell system includes a fuel cell for generating electrical power upon being supplied with anode gas and cathode gas. The fuel cell system includes a wetness control state determination unit that determines whether or not a wetness control of controlling a degree of wetness of an electrolyte membrane of the fuel cell is normally executed, a combined capacitance calculation unit that calculates a combined capacitance of the fuel cell, and an anode gas concentration control unit that determines the occurrence of decrease in an anode gas concentration in the fuel cell or executes a control for increasing the anode gas concentration if the combined capacitance of the fuel cell is smaller than a predetermined value when the wetness control is determined to be normally executed.

A fuel cell system includes a fuel supply unit that supplies a fuel to electrolyte membrane of fuel cell, an oxidant supply unit that supplies an oxidant to the electrolyte membrane, and an electricity generation control unit that controls electricity generation by the fuel cell by controlling supply of the oxidant by the oxidant supply unit and supply of the fuel by the fuel supply unit. the fuel cell system includes a wet/dry state detection unit configured to detect a wet/dry state of the electrolyte membrane, a flow rate adjustment unit configured to adjust a flow rate of the fuel supplied to the fuel cell by the fuel supply unit; and a temperature adjustment unit configured to adjust a temperature of the oxidant supplied to the fuel cell by the oxidant supply unit. when reducing an amount of water in the electrolyte membrane in accordance with a signal output from the wet/dry state detection unit, the electricity generation control unit is configured to reduce the flow rate of the fuel, and increase the temperature of the oxidant in accordance with the signal from the wet/dry state detection unit, compared with when increasing the amount of water in the electrolyte membrane.

A method for controlling a fuel cell vehicle includes acquiring a state data, deriving a mathematical voltage model by substituting the acquired state data into a voltage calculation formula, measuring a voltage of a fuel cell, approximating a mathematical voltage model to a measurement voltage and deriving the reaction area data when the mathematical voltage model approximates the measurement voltage, and controlling the system of the fuel cell vehicle based on the derived reaction area data to eliminate or prevent an over-humidification situation of the fuel cell.

A fuel cell system operates under at least one of the conditions of no humidity or high temperature, and an operating method thereof, are characterized in that a fuel cell has a fuel gas flow path and an oxidant gas flow path arranged such that fuel gas and oxidant gas flow in opposite directions, a determining apparatus that determines the amount of water near the oxidant gas flow path inlet, and a fuel gas control apparatus which increases the amount of water near the oxidant gas flow path inlet by increasing the fuel gas flowrate and/or reducing the fuel gas pressure if it is determined in the determining apparatus that the amount of water near the oxidant gas flow path inlet is insufficient.

An apparatus includes a stack voltage monitor that measures a voltage of each channel of a plurality of channels of a fuel cell stack. Each of the channel of the plurality of channels includes a predetermined number of unit cells. The stack voltage monitor calculates impedance of each of the channel from the measured voltage. The apparatus further includes a controller that diagnoses a state of the fuel cell stack based on the impedance of each of the channel.

Systems and methods for initiating voltage recovery procedures in a fuel cell system based in part on an estimated specific activity over the life of a fuel cell catalyst are presented. In certain embodiments, SA loss of catalyst and electrochemical surface area loss of a FC system may be estimated. An output voltage of the FC system may be estimated based on the estimated SA loss and the electrochemical surface area loss. An amount of recoverable voltage loss may be determined based on a comparison between the estimated output voltage and a measured output voltage. Based on the determined amount of recordable voltage loss, a FC system control action (e.g., a voltage recovery procedure) may be initiated.

A system and device for water evaporation of a fuel cell, and a control method thereof, are disclosed. The system includes a stack provided in a fuel cell vehicle to produce electric power. The system includes an injection member connected to the stack. The injection member retains water generated in the stack, and injects water at high pressure and evaporates injected water particles. The system includes a compressor that supplies high-temperature air to the injection member. Even when the fuel cell vehicle is cold-started, evaporation is enabled through water injection to directly cool air supplied to the stack. Water is evaporated even without a humidifier so that performance of the fuel cell system may be enhanced, while reducing cost.

An apparatus and a method for controlling a humidification amount of a membrane humidifier for a fuel cell are provided. The humidification amount of the membrane humidifier relative to air supplied to a stack is changed by adjusting a difference in partial pressure of moisture between the inside and the exterior of a hollow fiber membrane that constitutes the membrane humidifier for a fuel cell.