A control system and method for preventing a fuel cell from overheating are disclosed. The system includes: a fuel cell that generates electric power through reaction of fuel gas and oxidation gas; a cooling line in which a cooling medium flows and performs heat exchange with the fuel cell; a cooling pump installed on the cooling line and configured to circulate the cooling medium through the cooling line; a cooling controller that controls an operating state of the cooling pump on the basis of the temperature of the fuel cell or the cooling medium; and a power generation controller that limits power generation of the fuel cell on the basis of the operating state of the cooling pump.

A rational fuel-cell power following strategy is made according to values such as vehicle fuel-cell power, battery power, and SOC (state of charge) of a lithium-ion battery; in the same time window, effects of different fuel-cell power growth rates on SOC of the lithium-ion battery are tested according to vehicle requirements; and at the same fuel-cell growth rate, effects of different time windows on SOC of the lithium-ion battery are tested according to vehicle requirements; a proper time window and a proper fuel-cell power change rate are found, so that the SOC value of the lithium-ion battery fluctuates within a certain range. The present invention can achieve a good operation mode of power distribution between the fuel cell and the lithium-ion battery, ensuring rational utilization of resources, thereby extending the application range of the lithium-ion battery to the maximum extent.

A fuel cell system may include: a fuel cell unit connected to an output terminal; a battery unit connected to the fuel cell unit in parallel: and a controller configured to control the fuel cell unit to maintain an output voltage of the fuel cell unit at an idling voltage which is higher than zero and lower than an output voltage of the battery unit when a target output power is lower than an output power lower limit set for the fuel cell unit.

A system for operating a fuel cell includes a controller configured to derive an output limit value of the fuel cell through an interval average value corresponding to an average of output values of the fuel cell for a designated time and a cumulative average value corresponding to an average of the output values of the fuel cell until the current point in time after starting to operate the fuel cell, and to control operation of the fuel cell based on the derived output limit value.

A fuel cell system configured to supply electric power to load includes: a fuel cell; and a control unit configured to set target electric power to be generated by the fuel cell and control electric power generation by the fuel cell such that the fuel cell generates the target electric power. The control unit is configured to, when setting the target electric power using request electric power that the load requests the fuel cell to generate, execute a fluctuation suppression process for making a fluctuation of the target electric power smaller than a fluctuation of the request electric power.

A pressure control system of a fuel cell stack includes: an air supply control unit for controlling a revolutions per minute (RPM) of an air compressor for supplying air to a cathode side of the fuel cell stack based on a required output of the fuel cell stack; a hydrogen supply control unit for controlling a pressure at an anode side of the fuel cell stack with a target pressure based on the required output of the fuel cell stack; and a differential pressure control unit for controlling the air supply control unit or the hydrogen supply control unit to calculate a differential pressure between the anode side and the cathode side of the fuel cell stack, and to modify the target pressure or the RPM of the air compressor based on the calculated differential pressure.

An FCV includes: a driving device that generates traveling power by using at least one of electric power output from an FC system and electric power output from a battery; and a display device that presents a first indicator and a second indicator, the first indicator indicating a remaining amount of electric power to be output from the FC system, the second indicator indicating a remaining amount of electric power to be output from the battery. An amount of electric power that can be output from the FC system when the hydrogen tank is full is larger than an amount of electric power that can be output from the battery when the battery is fully charged. A presentation area of the first indicator is larger than a presentation area of the second indicator.

To provide an air vehicle configured to stabilize the power output of a fuel cell by securing the generated water discharge property of the fuel cell. An air vehicle, wherein the air vehicle comprises two or more fuel cells; wherein each fuel cell comprises an anode outlet manifold; and wherein each fuel cell is disposed in the air vehicle so that water discharge directions of the anode outlet manifolds are different from each other.

To provide a fuel cell system configured to increase fuel cell performance even at high altitude. A fuel cell system for air vehicles, wherein the fuel cell system comprises: a fuel cell, an oxidant gas system for supplying oxidant gas to the fuel cell, an altitude sensor, and a controller; wherein the oxidant gas system comprises an air compressor and a bypass flow path bypassing the fuel cell; wherein the bypass flow path comprises a bypass valve; and wherein, when the controller detects an altitude increase measured by the altitude sensor, the controller increases a rotational speed of the air compressor, and the controller increases an opening degree of the bypass valve.

An air handling system for a fuel cell stack includes a pneumatic storage device disposed downstream from a compressor, a flow control valve system configured to operatively couple an inlet of the pneumatic storage device to an outlet of the compressor and configured to operatively couple an outlet of the pneumatic storage device to an inlet of the fuel cell stack, and a controller configured to, in response to a power demand being greater than a threshold, cause the flow control valve to open to increase a flow rate of air from the pneumatic storage device to the fuel cell stack.