A control circuit controls fillings speeds of hydrogen gas filling a fuel tank. The control circuit a) receives values of a characteristic of the tank during a process of filling the tank with the hydrogen gas, b) calculates at different times during the filling process the differences between a preset threshold of the characteristic of the tank and the values of the characteristic of the tank received at the different times during the filling process, c) calculates plural filling speeds of the hydrogen gas filling the tank during the filling process, each of the filling speeds depending on one of the plurality of differences between the preset threshold and the values of the characteristic of the tank received at the different times during the filling process, and d) controls an operation of a dispenser for filling the tank with the hydrogen gas at the calculated filling speeds.

The invention relates to a method for filling a tank with a pressurized fuel gas, the average temperature of the gas in the tank is estimated in real time during the filling. The method includes, before the filling, determining the initial temperature of the gas in the tank, determining the initial pressure of the gas in the tank, determining the initial average temperature of the wall of the tank and determining the initial mass of gas in the tank. According to the method, during the filling, the enthalpy of the gas entering into the tank is determined as a function of time and the mass of gas injected into the tank is determined as a function of time or, respectively, the pressure in the tank is determined as a function of time. The average temperature of the gas at the time in the tank is determined in degrees K.

The invention relates to a valve for a pressurized fluid cylinder comprising a draw off circuit, a data acquisition, storage, and processing member, at least one display and a pressure sensor for measuring the pressure within the storage space of a fluid cylinder connected to the valve. When the variation of the signal representing the fluid pressure measured by the pressure sensor is greater than a specific draw off threshold, the data acquisition, storage and process member is designed to detect the drawing off of gas and, in response, to control the displaying on the display of at least one item of information concerning the draw off.

The invention relates to a valve for a pressurized fluid cylinder comprising a member for manually controlling a flow-regulating member, a sensor for detecting the position of the member for manually controlling the regulating member, a data acquisition, storage, and processing member, and a display for information relating to the fluid flow and/or pressure imposed by the regulating member and/or the valve use mode, wherein when the manual control member is disposed in an intermediate position between two respective adjacent values of the flow and/or pressure of the fluid allowed to pass from the upstream end to the downstream end, the data acquisition, storage and process member is designed to suppress the display information.

The invention relates to a pressurized fluid cylinder, a member for acquiring, storing and processing data, and at least one data display device. The valve comprises a sensor which detects the position of a manual control member, and a pressure sensor for measuring the pressure inside the storage space of a fluid cylinder. The data acquisition, storage and processing member is designed to: calculate an actual value for the amount of fluid remaining and/or drawn off; calculate a theoretical value for the amount of fluid remaining and/or drawn of on the basis of the regulation performed by the regulating member and measured by the position of the control member compare the actual value based on the measurement of the pressure sensor with the theoretical value; and generate a warning signal if the difference between these actual and theoretical values is greater than a specific safety threshold.

A storage and distribution method and system for a gaseous commodity such as hydrogen comprises a plurality of sensors for measuring quantity and purity of the gas produced, or that is stored or being delivered in vessels, and a gateway which communicates sensor data to a distribution system. The distribution system analyzes the data to determine the real time availability and available locations of gas of the desired purity, taking into consideration the sensor data, degradations, and the effects of dispensing, replenishing and mixing of supplies. The distribution system also provides delivery routing according to proximity and purity requirements.

A method for monitoring the passage of gas through a supply tube includes measuring the pressure of the gas inside a pressurized container at a first time and at a second time. The temperature of the gas is measured. A pressure difference is calculated. A temperature difference is calculated. An alarm signal is generated if the pressure difference is less than a pre-established value and the temperature difference is greater than or equal to zero.

To enable a hydrogen tank to be efficiently filled with hydrogen even when the hydrogen tank has a large capacity, hydrogen filling at the nozzle flow is prohibited when the nozzle flow of a nozzle is larger than the receptacle flow of a receptacle or when the receptacle flow is unknown under the condition that the nozzle and the receptacle can be connected to each other.

To provide a hydrogen consumption system capable of suppressing the generation of emission sound at the time of separation of a hydrogen tank, which is unlikely to cause defects. Detachable hydrogen tank, a fuel cell using hydrogen from the hydrogen tank as a fuel, connecting the hydrogen tank and the fuel cell, a pipe through which hydrogen flows, the opening and closing valve provided in the pipe, and a control device, when desorption of the hydrogen tank, the control device closes the on-off valve, the pressure in the pipe to calculate the amount of hydrogen consumed by the power generation of the fuel cell until less than 1 MPa, the current demand value of the fuel cell from the amount of hydrogen consumed, and, the current upper limit value of the fuel cell is calculated, when the actual current value is greater than the current upper limit value, the current request value performs control for changing to be equal to or less than the current upper limit value.

Approaches for predicting or detecting hydrogen leakage in a hydrogen amenity, are described. According to one example, a hydrogen leakage detection unit may be provided. The hydrogen leakage detection unit may receive sensor data for a section of hydrogen amenity from a sensor unit installed proximate to the section. The sensor data may include at least one of a concentration level of hydrogen within the section, a concentration level of metal particles in the hydrogen, a temperature value of the hydrogen, a pressure value of the hydrogen, a humidity value around the section, a deviation level of electrochemical liquid within the sensor unit, and an image of the section. The sensor data may be processed to ascertain occurrence of existing hydrogen leakage or probable hydrogen leakage at the section. One or more preventive actions may be initiated upon ascertaining the occurrence of existing hydrogen leakage or probable hydrogen leakage.