A hydrogen leakage detection system for detecting a hydrogen leakage in a fuel cell system includes: an outer shell configured to accommodate a hydrogen flow section; a hydrogen sensor; and a porous sheet disposed to delimit at least a part of a space within the outer shell and allowing permeation of hydrogen through the porous sheet in a thickness direction thereof. The hydrogen flow section is disposed in a region below the porous sheet, and the hydrogen sensor is disposed in a region above the porous sheet.

A fuel gas injection apparatus includes a chamber, a heat exchanger, a supply manifold, injectors, and a mount body. The chamber is in communication with a fuel gas tank, and the heat exchanger is in communication with the chamber. The supply manifold is in communication with the heat exchanger and has a plurality of branched flow channels for flowing a fuel gas. The plurality of injectors detachably communicate with the branched flow channels of the supply manifold. The mount body is in communication with the plurality of injectors and guides the fuel gas injected from plurality of injectors to a fuel cell stack. The chamber and the heat exchanger are attached to the mount body.

In a fuel cell vehicle and a method of controlling the fuel cell vehicle, when a gas pressure in a high pressure tank becomes less than a first threshold pressure, the SOC of an energy storage device is increased to a margin SOC. When the gas pressure becomes a second threshold pressure which is lower than the first threshold pressure, the amount of fuel released from the high pressure tank is limited to prevent the occurrence of buckling, and limit the travel driving force by the motor to a required limit. At the time of limiting the travel driving force, electrical energy of the energy storage device is used to provide assistance in a manner that the travel driving force by the motor becomes the travel driving force of the required limit.

A control method for a fuel cell stop mode is provided. The method includes measuring an air flow rate supplied to a fuel cell stack and when a fuel cell stop mode is entered, determining an oxygen distribution state between cells included in the fuel cell stack based on the measured air flow rate. Air supply is then supplied to the fuel cell stack or the air supply to the fuel cell stack is interrupted based on the determined oxygen distribution state.

A fuel cell system including a cathode gas supply system of a cathode gas bypass type includes a first flow rate sensor which detects a cathode gas flow rate to be supplied by the compressor, a second flow rate sensor which detects a cathode gas flow rate to be supplied to the fuel cell, a bypass valve which controls a cathode gas flow rate flowed in the bypass channel, a bypass valve controlling unit configured to execute an open/shut-off control of the bypass valve in accordance with an operation state of the fuel cell system, and a mismatch diagnosing unit configured to detect a mismatch of detected values of the first flow rate sensor and the second flow rate sensor based on the detected values of the both sensors during total shut-off of the bypass valve.

In one aspect, disclosed are a hydrogen leak sensing device and method for a fuel cell vehicle. The device comprises a processor configured to control a valve of a hydrogen tank, wherein the processor may calculate a state of fuel (SOF) of the hydrogen tank when the valve is closed and a SOF of the hydrogen tank when the valve is opened, and determine whether hydrogen leak has occurred based on the calculated SOFs.

A method for transitioning between fuel cell and electrolysis modes in a Reversible Solid Oxide Fuel Cell (RSOFC) system includes measuring and recording sensor data indicating a status of components associated with an RSOFC system coupled to an electrical power grid, the system comprising an RSOFC unit, a hydrogen compression system, a hydrogen storage system, and a water supply, determining a state of the RSOFC system based on the sensor data through a conditional logic algorithm, and transitioning the RSOFC system between the fuel cell mode and the electrolysis mode based upon the sensor data and the system state.

A method of operating a fuel cell system which includes a plurality of fuel cells and a plurality of auxiliary components located in at least one cabinet, includes monitoring, by a control unit, a parameter of the fuel cell system, determining whether the parameter has violated a threshold, and varying an auxiliary bus voltage provided to the plurality of auxiliary components connected to a common auxiliary bus by a first amount in response to determining that the parameter has violated the threshold.

A fuel cell system (100) includes a hydrogen supply valve (33) that controls a supply of the anode gas into an anode system, a purge valve (36) that discharges an off-gas from the anode system, a pressure detecting unit (34) configured to measure a pressure inside the anode system, and a purge flow rate estimating unit (4) configured to estimate a purge flow rate of the off-gas discharged from the anode system through the purge valve (36) based on a pressure decrease in a purge valve open state and a pressure decrease in a purge valve close state when an anode gas supply into the anode system stops.

The present invention relates, amongst other things, to a flushing system (40) for flushing an energy source device (15) and/or an energy sink device (16) of an energy system (10), the flushing system comprising: a flushing device (41) having a storage chamber (45), which on the input side is fluidically connected to a first line portion (46), which is formed as a flushing line starting from the energy source device (15), and/or to a second line portion (47), which is formed as a flushing line starting from the energy sink device (16); a first monitoring device (50) for monitoring the state of the storage chamber (45), the first monitoring device (50) comprising at least one sensor device (50a) associated with the storage chamber (45) for monitoring the fill level of the storage chamber (45); and also optionally a compensation container device (54) fluidically connected to the storage chamber (45). In order to further advantageously modify the flushing system (40) by simple structural and economical measures so that the flushing system can be monitored in a safety-related manner, the flushing system (40) comprises a safety control device (53); the sensor device (50a) for monitoring the fill level of the storage chamber (45) is connected to the safety control device (53) via an interface (80, 81) associated with the storage chamber; and the flushing system (40) optionally has at least one further monitoring device (66, 70) for monitoring the state of the compensation container device (54) and/or for monitoring valve devices (48, 49, 57, 59) which is/are connected to the safety control device (53) via interfaces associated with the compensation container device and/or valve devices.