An alarm system for detecting a gas leakage from a vehicle is provided. The alarm system includes a control unit and one or more gas leakage sensors configured to be temporarily arranged on or at the vehicle. The control unit is arranged to obtain information indicating locations of the one or more gas leakage sensors while temporarily arranged on or at the vehicle. The control unit is also arranged to identify, upon generate a warning alert signal in the alarm system, the location of a gas leakage sensor based on the obtained information as the gas leakage sensor detects a gas leakage.

A fuel cell electric vehicle includes: a motor, a fuel cell stack and an integrated controller, which are accommodated in a PE room provided in a front of a vehicle body; a battery assembly including a high-voltage battery electrically connected to the motor and the fuel cell stack, and a low-voltage battery for supplying electric power to a vehicle electrical part; an IDC that is mounted between the PE room and the battery assembly, and electrically connects the high-voltage battery to the motor and the fuel cell stack; and a plurality of hydrogen tanks that is mounted at a rear of the battery assembly and below the vehicle body. In particular, the battery assembly is mounted at a rear of the PE room and below the vehicle body, and the IDC converts power of the high-voltage battery to be supplied to the low-voltage battery.

A fuel cell system includes: an external load connected to a fuel cell; an electric power adjusting unit configured to adjust a generated electric power of the fuel cell in accordance with electric power consumption of the external load; a humidity control unit configured to control humidity of an electrolyte membrane in the fuel cell on the basis of the generated electric power of the fuel cell; an output voltage detecting unit configured to detect an output voltage of the fuel cell; and a cross leakage determining unit configured to cause the humidity control unit to increase the humidity of the electrolyte membrane when the fuel cell generates the electric power, the cross leakage determining unit being configured to determine whether a cross leakage amount increases or not on the basis of a change in the output voltage at that time.

Embodiments may include a hydrogen-based power storage unit device that provides power for electric vehicles, and other uses, without requiring hydrogen refueling infrastructure. For example, in an embodiment, an apparatus may comprise a power source, a water supply, an electrolyzer connected to the power source adapted to separate water from the water supply into hydrogen and oxygen, a fuel cell adapted to generate electrical power using the separated hydrogen and oxygen, and a power conditioning unit adapted to output a configured electrical power output.

A fuel cell system includes a fuel cell unit configured to generate an amount of electrical power for supply to a varying electrical load and a fuel cell controller configured to receive a first indication that the varying electrical load is at a local maximum within a predetermined period, and, in response, operate the fuel cell unit with an operational parameter having a first value such that the fuel cell unit produces a limited maximum amount of electrical power that is a predetermined percentage of a maximum rated power output of the fuel cell unit. The fuel cell controller is also configured to receive an indication that the varying electrical load has reduced, and, in response, operate the fuel cell unit with the operational parameter having a second value such that the fuel cell unit produces an amount of electrical power below the limited maximum amount of electrical power.

A fuel cell system includes a fuel cell unit configured to generate an amount of electrical power for supply to a varying electrical load and a fuel cell controller configured to receive a first indication that the varying electrical load is at a local maximum within a predetermined period, and, in response, operate the fuel cell unit with an operational parameter having a first value such that the fuel cell unit produces a limited maximum amount of electrical power that is a predetermined percentage of a maximum rated power output of the fuel cell unit. The fuel cell controller is also configured to receive an indication that the varying electrical load has reduced, and, in response, operate the fuel cell unit with the operational parameter having a second value such that the fuel cell unit produces an amount of electrical power below the limited maximum amount of electrical power.

Provided is a power control apparatus for a fuel cell vehicle which includes a fuel cell and which is driven by an electric motor that is supplied with electric power from the fuel cell. The power control apparatus includes an accelerator sensor that detects an operation of an accelerator, and a control unit that controls the fuel cell to increase the output power of the fuel cell so as to correspond to an increase in a requested acceleration output based on the detected accelerator opening degree. When the accelerator opening degree is less than a first accelerator determination value that is set in advance, the control unit controls the fuel cell to suppress an increase in the output power thereof.

A voltage synchronization method and system are provided. The system includes a main controller that is configured to determine whether voltage synchronization is possible. When the voltage synchronization is determined to be possible, the main controller is configured to transmit a voltage synchronization command to a plurality of auxiliary controllers. The plurality of auxiliary controllers are configured to adjust sensed voltages based on an output voltage of a fuel cell stack when the transmitted voltage synchronization command is received.

A system control method is provided for measuring a distance between a smart key and a vehicle. When the distance between the smart key and the vehicle is changed based on a predetermined distance whether a hydrogen leak occurs is detected by a hydrogen sensor detection controller. A driver is then informed of a hydrogen leak via a display on a cluster, a turn-on of an emergency light, and a warning sound of the vehicle. Alternatively, a starting-impossible state of the vehicle or shutting-down starting of the vehicle is maintained to ensure safety measures based on the concentration of the leaking hydrogen.

A system and method for operating a fuel-cell system, which is attached to at least one further component via a cooling and/or lubricating circuit. A water-based, oil-free coolant and lubricant is used, and a flushing procedure for the fuel cell is initiated when a contamination of the fuel cell by the water-based, oil-free coolant and lubricant is detected.