Patent Description:
A hydrogen vehicle is a vehicle that uses hydrogen fuel for motive power and converts the chemical energy of hydrogen to mechanical energy either by burning hydrogen in an internal combustion engine. Hydrogen, as a fuel for hydrogen vehicles, has the nature of quick fueling at a high pressure and has a risk as compared with use of fossil fuels and its full fueling is not easy due to the Joule-Thomson effect. Many countries have developed hydrogen fueling protocols and some of them use a lookup table regarding the pressure ramp rate and the target pressure based on parameters upon fueling. However, such conventional art does not perform fueling control based on measurements obtained in real-time and suffers from the need for creating of a complicated filling or fueling program based on numerous lookup tables and myriad conditions under the condition that various mobility devices, such as drones, boats, or forklifts, as well as vehicles, are being developed, and may thus not be adopted unless some conditions are met, failing to provide accurate fueling and control.

<CIT> and <CIT> disclose a configuration of measuring, in real-time, the difference between the target temperature and sensing temperature upon filling a compressed hydrogen storage tank with hydrogen from a dispenser and controlling the filling flow of hydrogen to allow the sensing temperature to reach the target temperature and a method of measuring, in real-time, the degree of deformation in a compressed hydrogen storage tank and stopping hydrogen fueling upon detecting a preset degree of deformation.

However, the protocols disclosed in the prior art documents are not control protocols developed under the assumption of real-time communication, ending up turning back to the original issue that real-time hydrogen control is impossible. The reason why the protocols have been complicated comes from the incapability of communication or unreliable communication between the hydrogen refueling station and the vehicle. Thus, a need exists for research and development of a standardized protocol ensuring communication capable all the time and the reliability of communication. Reliable communication allows the temperature and pressure, which are major risk factors for use of hydrogen as a fuel, to be monitored and predicted in real-time while calculating the pressure ramp rate and target pressure, thereby contributing to creation of a simplified protocol. Therefore, a robust communication protocol and a controlling method for real-time monitoring are needed.

<CIT> discloses systems and techniques for hydrogen fueling with integrity checks. In the document it is described that communicated parameters measured by on-board sensors of a vehicle may be cross-referenced against calculated parameters measured by sensors of a fueling station, the communicated parameters relating to a compressed hydrogen storage system (CHSS) tank of a vehicle to be fueled may be received at different time intervals, the calculated parameters may be calculated based on a mass of hydrogen fuel dispensed by a hydrogen fueling station from a reference point to one of the time intervals and densities of the CHSS tank of the vehicle at respective time intervals, an error may be calculated between the communicated parameters and the calculated parameters, and a fueling mode, such as a conservative fueling mode or a non-conservative fueling mode, may be determined based on the calculated error.

According to various embodiments, in order to fill hydrogen tanks with hydrogen more safely and quickly based on the structural information and thermodynamic information about the hydrogen tanks sent from the CHSS via wireless communication while filling the hydrogen tanks with hydrogen, the pressure and temperature of hydrogen inside the hydrogen tanks may be measured in real-time, and the dispenser may receive the pressure and temperature, which have been measured in real-time, from the CHSS via wireless communication, calculate the optimal pressure ramp rate, and allows hydrogen fueling to be performed at the optimal pressure ramp rate, thereby minimizing the fueling time within a range in which the hydrogen pressure, temperature, and state of charge (SOC) inside the hydrogen tank do not exceed preset thresholds.

A more complete appreciation of the present disclosure and many of the attendant aspects thereof will be readily obtained as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:.

Hereinafter, exemplary embodiments of the inventive concept will be described in detail with reference to the accompanying drawings. The inventive concept, however, may be modified in various different ways, and should not be construed as limited to the embodiments set forth herein. Like reference denotations may be used to refer to the same or similar elements throughout the specification and the drawings. However, the present disclosure may be implemented in other various forms and is not limited to the embodiments set forth herein. For clarity of the disclosure, irrelevant parts are removed from the drawings, and similar reference denotations are used to refer to similar elements throughout the specification.

In embodiments of the present disclosure, when an element is "connected" with another element, the element may be "directly connected" with the other element, or the element may be "electrically connected" with the other element via an intervening element. When an element "comprises" or "includes" another element, the element may further include, but rather than excluding, the other element, and the terms "comprise" and "include" should be appreciated as not excluding the possibility of presence or adding one or more features, numbers, steps, operations, elements, parts, or combinations thereof.

When the measurement of an element is modified by the term "about" or "substantially," if a production or material tolerance is provided for the element, the term "about" or "substantially" is used to indicate that the element has the same or a close value to the measurement and is used for a better understanding of the present disclosure or for preventing any unscrupulous infringement of the disclosure where the exact or absolute numbers are mentioned. As used herein, "step of" A or "step A-ing" does not necessarily mean that the step is one for A.

As used herein, the term "part" may mean a unit or device implemented in hardware, software, or a combination thereof. One unit may be implemented with two or more hardware devices or components, or two or more units may be implemented in a single hardware device or component. However, the components are not limited as software or hardware but may rather be configured to be stored in a storage medium or to execute one or more processors. Accordingly, as an example, a 'unit' includes elements, such as software elements, object-oriented software elements, class elements, and task elements, processes, functions, attributes, procedures, subroutines, segments of program codes, drivers, firmware, microcodes, circuits, data, databases, data architectures, tables, arrays, and variables. A function provided in an element or a 'unit' may be combined with additional elements or may be split into sub elements or sub units. Further, an element or a 'unit' may be implemented to process one or more CPUs in a device or a security multimedia card.

As used herein, some of the operations or functions described to be performed by a terminal or device may be, instead of the terminal or device, performed by a server connected with the terminal or device. Likewise, some of the operations or functions described to be performed by a server may be performed by a terminal or device connected with the server, instead of the server.

As used herein, some of the operations or functions described to be mapped or matched with a terminal may be interpreted as mapping or matching the unique number of the terminal, which is identification information about the terminal, or personal identification information.

Hereinafter, embodiments of the disclosure are described in detail with reference to the accompanying drawings.

<FIG> is a view illustrating a hydrogen safe fueling system based on real-time communication information from a compressed hydrogen storage system (CHSS) for fuel cells according to an embodiment. <FIG> is a block diagram illustrating an internal configuration of a system as shown in <FIG>.

Referring to <FIG>, a hydrogen safe fueling system <NUM> based on real-time communication information from a CHSS for fuel cells may include at least one compressed hydrogen storage system (CHSS) <NUM>, a data hydrogen moving device <NUM>, and a dispenser <NUM>. However, the hydrogen safe fueling system <NUM> is merely an example, and the scope of the present disclosure is not limited by <FIG>.

The components of the system <NUM> of <FIG> are connected together via a network <NUM>. For example, as shown in <FIG>, the at least one CHSS <NUM> may be connected with the data hydrogen moving device <NUM> via a network. The data hydrogen moving device <NUM> may be connected with the at least one CHSS <NUM> and the dispenser <NUM> via the network. The dispenser <NUM> may be connected with the data hydrogen moving device <NUM> via the network.

Here, the network means a connection structure capable of exchanging information between nodes, such as a plurality of terminals or servers, and examples of the network include local area networks (LANs), wide area networks (WANs), internet (world wide web (WWW)), wired/wireless data communication networks, telephony networks, or wired/wireless television communication networks. Examples of the wireless data communication networks may include, but are not limited to, <NUM>, <NUM>, or <NUM> networks, 3rd Generation Partnership Project (3GPP) networks, Long Term Evolution (LTE) networks, Long Term Evolution-Advanced (LTE-A) networks, World Interoperability for Microwave Access (WIMAX) networks, Internet, Local Area Networks (LANs), wireless LANs, Wide Area Networks (WANs), Personal Area Networks (PANs), Bluetooth networks, near-field communication (NFC) networks, satellite broadcast networks, analog broadcast networks, and Digital Multimedia Broadcasting (DMB) networks.

According to embodiments, a plurality of components of the same type may be a single component of the type, and one component may add one or more components of the same type.

Each component of <FIG> is described below in connection with <FIG>.

The CHSS <NUM> may include a hydrogen tank <NUM> and a hydrogen tank valve <NUM>. The CHSS <NUM> may include a plurality of hydrogen tanks <NUM>. The CHSS is installed in a hydrogen vehicle and is provided to receive and store hydrogen as a fuel. The hydrogen tank valve <NUM> includes a pressure sensor and a temperature sensor and measure the pressure and temperature of hydrogen supplied to the hydrogen tank <NUM> and transfer the measurements to a CHSS controller <NUM> of the data hydrogen moving device <NUM>.

The data hydrogen moving device <NUM> may include a receptacle <NUM> to transfer the hydrogen dispensed from a hydrogen supply unit <NUM> to the hydrogen tank valve <NUM>, a wireless communication unit provided for communication between the CHSS controller <NUM> and a dispenser controller <NUM> in the dispenser <NUM>, and the CHSS controller <NUM> to convert sensing data into data for wireless communication and output the sensing data. The data hydrogen moving device <NUM> may further include a fueling nozzle <NUM> connected between the receptacle <NUM> and the hydrogen supply unit <NUM> to supply hydrogen to the hydrogen tank <NUM> via the hydrogen tank valve <NUM>. The wireless communication unit may include an infrared (IR) transmitter <NUM> that is connected with the CHSS controller <NUM> which is installed on one side of the receptacle <NUM> through which hydrogen is injected to the vehicle and an IR receiver <NUM> having one end connected with the IR transmitter <NUM> and the opposite end connected with the dispenser controller <NUM>.

The dispenser <NUM> may include the dispenser controller <NUM> to receive sensing data including the temperature and pressure of the hydrogen inside the hydrogen tank <NUM> and the hydrogen supply unit <NUM> to supply hydrogen to the hydrogen tank <NUM> based on the sensing data. The dispenser controller <NUM> may receive data from the wireless communication unit and the hydrogen supply unit <NUM>, calculate a real-time pressure ramp rate inside the hydrogen supply unit <NUM>, and provide the calculated pressure ramp rate to the hydrogen supply unit <NUM>.

Operations of the CHSS real-time communication information-based hydrogen safe fueling system of <FIG> and <FIG> are described below in detail with reference to <FIG> and <FIG>. However, what is described below is merely an example, and embodiments of the disclosure are not limited thereto.

<FIG> is a flowchart illustrating a method of fueling by a dispenser controller of a hydrogen safe fueling system based on real-time communication information from a CHSS for fuel cells according to an embodiment. <FIG> is a flowchart illustrating a method of driving a simple thermodynamic model of <FIG>.

Referring to <FIG>, according to an embodiment, the hydrogen safe fueling system <NUM> based on real-time communication information from a CHSS for fuel cells enables hydrogen fueling more quickly and safely, based on the structural information and thermodynamic information about the hydrogen tank, which is sent from the CHSS to the dispenser <NUM> via wireless communication while filling the hydrogen tank with hydrogen. To that end, the CHSS <NUM> may measure, in real-time, the pressure and temperature inside the hydrogen tank <NUM>, and the dispenser <NUM> may receive the pressure and temperature from the CHSS <NUM>, calculate the optimal pressure ramp rate, and allow hydrogen fueling to be performed at the calculated optimal pressure ramp rate. Thus, hydrogen fueling time may be minimized within a range in which the pressure, temperature, and filling flow rate of hydrogen in the hydrogen tank <NUM> do not depart from preset thresholds.

The approximations mentioned in <FIG> and <FIG> may be described with reference to Table <NUM> below, and no duplicate description is given.

<FIG> illustrates a process in which the dispenser controller <NUM> receives data from the IR receiver <NUM> and the hydrogen supply unit <NUM>, calculates a new pressure ramp rate (prrnew, optimal pressure ramp rate. and provides the calculated pressure ramp rate to the hydrogen supply unit <NUM>. To that end, the dispenser controller <NUM> of the dispenser <NUM> performs the algorithm shown in <FIG>.

In the first step S3100, the dispenser controller <NUM> may gather initial state values from the hydrogen tank <NUM> of the CHSS <NUM> and the hydrogen supply unit <NUM> of the dispenser <NUM>. The initial state values may include the structural variable values of the hydrogen tank <NUM>, the structural variable values of the data hydrogen moving device <NUM>, the initial thermodynamic variable values of the gas supplied by the dispenser <NUM>, and the thermodynamic variable values of the hydrogen in the hydrogen tank <NUM>.

The structural variable values of the hydrogen tank <NUM> may include the number (Ntank) of the hydrogen tanks <NUM>, the inner diameter (dinlet) of the inlet of the hydrogen tank <NUM>, and the volume (Vtank) of the hydrogen tank <NUM>. In this case, it is hypothesized that all of the hydrogen tanks <NUM> included in one CHSS <NUM> have the same structural variables. For example, it is assumed that the number of the hydrogen tanks <NUM> in the CHSS <NUM> and the inner diameter and volume thereof each have the same standard value. These values are received by the dispenser controller <NUM> via the IR receiver <NUM> and, since these values are unique values of the CHSS <NUM>, these values may be received only once before hydrogen fueling begins.

The structural variable values of the data hydrogen moving device <NUM> may include the pressure loss coefficient (Kline) of the data hydrogen moving device <NUM> which is measured by the hydrogen supply unit <NUM>. Since the pressure loss coefficient is also a unique value of the data hydrogen moving device <NUM> which is also referred to as a fueling line or hydrogen fueling line, the pressure loss coefficient may also be received only one time before hydrogen fueling starts. However, since the pressure loss coefficient (Kline) is a unique value of the data hydrogen moving device <NUM> but may be varied depending on the kind of the CHSS <NUM>, the pressure loss coefficient (Kline) of the entire data hydrogen moving device <NUM> may also be varied depending on the kind of the CHSS <NUM>. The pressure loss coefficient may be obtained using the pressure loss value (△Pline) obtained upon leakage check on the data hydrogen moving device <NUM> before hydrogen fueling starts, the density (ρline) of hydrogen in the data hydrogen moving device <NUM>, and Equation <NUM> below. Here, ṁline is the mass flow (hydrogen flow rate).

The initial thermodynamic variable values of the gas supplied by the dispenser <NUM> may include the pressure ( <MAT>) and temperature ( <MAT>) of the hydrogen supplied by the dispenser <NUM>. As these values, the ambient temperature measured around the dispenser <NUM> may be used. The thermodynamic variable values of the hydrogen in the hydrogen tank <NUM> may include the pressure ( <MAT>) and temperature ( <MAT>) of the hydrogen tank <NUM> which are gathered by the temperature sensor and pressure sensor embedded in the hydrogen tank valve <NUM> of the hydrogen tank <NUM>.

The initial pressure ramp rate (prr) for calculating the new pressure ramp rate (prrnew) may be the value obtained by dividing 20MPa/min by the number of hydrogen tanks <NUM>. A hydrogen fueling simulation is performed using the initial values of these variables to calculate the new pressure ramp rate (prrnew), and the new pressure ramp rate is applied to hydrogen fueling. Thus, the initial pressure ramp rate (prr) may be of no significance in practice. According to an embodiment, an intermediate value of the values empirically known may be adopted to save the time taken to discover a proper initial pressure ramp rate (prr).

In the second step S3200, the dispenser controller <NUM> may determine the mass flow and the temperature, pressure, and state of charge (SOC) of the hydrogen tank using a pre-stored simple thermodynamic model based on the initial state values. For example, in the second step S3200, the mass flow (ṁline), the temperature (Ttank) inside the hydrogen tank <NUM>, the pressure (Ptank) inside the hydrogen tank <NUM>, and the state of charge (SOC) are calculated using the simple thermodynamic model based on the initial values given in the first step S3100, and relatively larger values as compared with the resultant values of the simple thermodynamic model are selected to thereby determine the maximum mass flow ( <MAT>), maximum hydrogen tank temperature ( <MAT>), and the maximum hydrogen tank pressure ( <MAT>). The process of the simple thermodynamic model-based calculation is repeated while incrementing the time by △t and, if the state of charge (SOC) becomes <NUM> or more, the repeated calculation is stopped.

The dispenser controller <NUM> may calculate the differences between each of the determined mass flow, temperature, and pressure and each pre-stored safety threshold. In this case, the dispenser controller <NUM> may determine that the pressure ramp rate when all of the differences as a result of the repeated calculation are positive (+) values while one of the differences becomes each pre-stored set value or less. In this case, each pre-set set value may be configured based on an acceptable small value, e.g., based on the results of research. The third step S3300 may be a simulation result determining step. In the third step S3300, the dispenser controller <NUM> compares the maximum flow rate ( <MAT>), maximum hydrogen tank temperature ( <MAT>), and maximum hydrogen tank pressure ( <MAT>) with the safety thresholds (e.g., <NUM>/s, <NUM>, and <NUM>. 5MPa), respectively, thereby obtaining the differences, i.e., Δṁ , △T, and △P, respectively. In this case, what is intended by the dispenser controller <NUM> is to shorten the time required for hydrogen fueling by maximizing the initial pressure ramp rate (prr) within a range in which the maximum mass flow ( <MAT>), maximum hydrogen tank temperature ( <MAT>), and maximum hydrogen tank pressure ( <MAT>) do not exceed the safety thresholds. If any one of the three values exceeds its corresponding safety threshold, this may end up violating relevant rules. Thus, if all of Δṁ, △T, and △P are positive (+) values, and one of Δṁ, △T, and △P is a preset value, e.g., a small value as acceptable (based on the results of research), the applicable pressure ramp rate (prr) may be set to, and regarded as, the optimal pressure ramp rate (prr). In this case, since the regarded optimal pressure ramp rate (prr) is not the actual optimal pressure ramp rate, the optimal pressure ramp rate (prr) is first set and then the actual pressure ramp rate is discovered and applied in the fourth step below.

The dispenser controller <NUM> may discover and apply the pressure ramp rate of the hydrogen supply unit <NUM> based on the calculated differences. In this case, the fourth step may include a discovery step S3400 and an application step S3500. In the discovery step S3400, unless all of Δṁ, △T, and △P are positive (+) values, i.e., if any one of the values is a negative (-) value, the dispenser controller <NUM> reduces the pressure ramp rate (prr) and, if all of Δṁ, △T, and △P are positive values, but one of Δṁ, △T, and △P is not the preset value, i.e., the small value as acceptable, or less, the dispenser controller <NUM> increases the pressure ramp rate (prr) and repeats the second step S3200 and the third step S3300 to thereby discover the optimal pressure ramp rate (prr). In the application S3500, the dispenser controller <NUM> sets the optimal pressure ramp rate (prr) discovered in steps S3100 to S3400 as a new pressure ramp rate (prrnew) and transmits the new pressure ramp rate to the hydrogen supply unit <NUM> so that the hydrogen supply unit <NUM> may continue to fill the hydrogen tank <NUM> of the CHSS <NUM> at the new pressure ramp rate (prrnew).

If a preset time elapses after discovering the pressure ramp rate of the hydrogen supply unit <NUM> based on the calculated differences and applying the discovered pressure ramp rate, the dispenser controller <NUM> may recalculate a new optimal pressure ramp rate based on the temperature and pressure of the hydrogen tank <NUM> and the temperature and pressure of the hydrogen supply unit <NUM>. This step may be a step S3600 for requesting to calculate a new optimal pressure ramp rate (prrnew) and may be a step for requesting to update the new pressure ramp rate (prrnew) applied in step S3500. For example, when a predetermined time, e.g., two seconds, elapses, based on the pressure (Ptank') and temperature (Ttank') of the new hydrogen tank <NUM> received from the IR receiver <NUM> and the hydrogen supply unit <NUM> and the pressure (Pba') and temperature (Tba') of the data hydrogen moving device <NUM>, a new optimal pressure ramp rate (prrnew) may be recalculated. For example, if the pressure ramp rate is A at <NUM> seconds, the pressure ramp rate at two seconds may be recalculated to B and, two seconds thereafter, i.e., at four seconds, the pressure ramp rate may become C. In such a manner, the pressure ramp rate may be continuously updated to a new optimal pressure ramp rate (prrnew) (A-B-C).

According to an embodiment, the thermodynamic model used in the hydrogen fueling simulation does not reflect heat transfer in the data hydrogen moving device <NUM> and the hydrogen tank <NUM>. Thus, an error may occur in the calculation of the temperature of hydrogen in the hydrogen tank <NUM>. However, since the hydrogen fueling simulation is performed based on the pressure and temperature inside the hydrogen tank <NUM> in the current state, errors may reduce if the duration of the simulation is sufficiently short. Thus, the hydrogen fueling simulation may be repeated during the remaining fueling time until immediately before the hydrogen fueling is terminated.

The order of the above-described steps S3100 to S3600 is merely an example, and embodiments of the disclosure are not limited thereto. In other words, the above-described steps S3100 to S3600 may be performed in a different order, or some of the steps may be simultaneously performed or omitted.

<FIG> is a flowchart illustrating an operational process of a simple thermodynamic model according to an embodiment of the disclosure. In the simple thermodynamic model according to an embodiment of the disclosure, the initial values and the data received from the IR receiver <NUM> and the hydrogen supply unit <NUM> are used to calculate the mass flow ( <MAT>), the temperature ( <MAT>) of the hydrogen tank <NUM>, the pressure ( <MAT>) of the hydrogen tank <NUM>, and the state of charge (SOC), which are then compared with their immediately prior values, thereby determining the maximum mass flow ( <MAT>), maximum hydrogen tank temperature ( <MAT>), and maximum hydrogen tank pressure ( <MAT>). This step is a sub-step of step S3200 and, thus, the components or operations described above in connection with S3200 are not repeatedly described below. Steps S3100 to S3600 denoted the first step to the fifth step in <FIG> are defined as different steps from a first step S4100 to a sixth step S4600 below.

The dispenser controller <NUM> may set a supplied hydrogen pressure of the dispenser <NUM>. In the first step S4100, the pressure of hydrogen supplied from the dispenser <NUM> is set. The supplied hydrogen pressure of the dispenser <NUM> may be calculated using Equation <NUM> below based on the supplied hydrogen pressure ( <MAT>) of the immediately prior time step (-△t), the pressure ramp rate (prrk) of the current step, and the hydrogen fueling simulation time period (△t).

The dispenser controller <NUM> may calculate the mass flow which is the hydrogen flow rate of the data hydrogen moving device <NUM> (S4200). The mass flow ( <MAT>) of the data hydrogen moving device <NUM> may be obtained using Equation <NUM> based on the hydrogen density (ρtline) in the data hydrogen moving device <NUM>, the pressure ( <MAT>) of the hydrogen supplied by the dispenser <NUM>, the pressure ( <MAT>) of the hydrogen tank <NUM>, and the pressure loss coefficient (Kline) of the data hydrogen moving device <NUM>. As the difference between the pressure at which the dispenser <NUM> supplies hydrogen and the pressure of the hydrogen tank <NUM> increases, and the pressure loss coefficient (Kline) decreases, the mass flow ( <MAT>) of the data hydrogen moving device <NUM> tends to rise.

The dispenser controller <NUM> may calculate the stagnation enthalpy of the hydrogen flowing into the hydrogen tank <NUM>. In the third step S4300, the stagnation enthalpy (hstinlet) of the hydrogen flowing into the hydrogen tank <NUM> may be obtained using Equation <NUM> based on the enthalpy ( <MAT>) which is the function of the temperature and pressure of the hydrogen flowing into the hydrogen tank <NUM>, the mass flow ( <MAT>), the number (Ntank) of the hydrogen tanks <NUM> connected in parallel, the inner diameter (dinlet) of the inlet of the hydrogen tank <NUM>, and the density (ρtline) of hydrogen inside the data hydrogen moving device <NUM>. If the number (Ntank) of hydrogen tanks <NUM> connected in parallel increases, the flow velocity of the hydrogen flowing into each hydrogen tank <NUM> reduces and, thus, the stagnation enthalpy decreases. If the inlet inner diameter (dinlet) of the hydrogen tank <NUM> reduces, the flow velocity of the hydrogen flowing into the hydrogen tank <NUM> increases and so does the stagnation enthalpy.

The dispenser controller <NUM> may calculate the temperature inside the hydrogen tank <NUM>. In the fourth step S4400, the temperature inside the hydrogen tank <NUM> may be obtained using Equation <NUM> based on the internal energy variation ( <MAT>) inside the hydrogen tank <NUM> and the specific heat capacity ( <MAT>) of hydrogen inside the hydrogen tank <NUM>. In Equation <NUM>, the specific heat capacity ( <MAT>), the temperature ( <MAT>) of the hydrogen tank <NUM>, and the pressure ( <MAT>) of the hydrogen tank <NUM> need to be determined to obtain the internal temperature inside the hydrogen tank <NUM>. However, in an embodiment of the disclosure, from an order of calculation standpoint, it may be required to, before calculating the temperature ( <MAT>) of the hydrogen tank <NUM> and the pressure ( <MAT>) of the hydrogen tank <NUM>, calculate the specific heat capacity ( <MAT>). Thus, the calculation is performed by applying, instead of the temperature ( <MAT>) of the hydrogen tank <NUM> and the pressure ( <MAT>) of the hydrogen tank <NUM>, the temperature ( <MAT>) of the hydrogen tank <NUM> and the pressure ( <MAT>) of the hydrogen tank <NUM>. Resultantly, although the resultant temperature ( <MAT>) of the hydrogen tank <NUM> is higher than the actual value, since it results it conservative results, there is no safety issue.

The dispenser controller <NUM> may calculate the state of charge (SOC) corresponding to the pressure inside the hydrogen tank <NUM> and the degree at which the hydrogen tank <NUM> is filled with hydrogen (S4500). To increase the storage efficiency, hydrogen is compressed at a few tens of MPa, and it may be impossible to apply the ideal gas equation to high-pressure compressed hydrogen. To obtain the pressure ( <MAT>) of the hydrogen tank <NUM>, the compressibility factor of hydrogen needs to be known. To precisely calculate the pressure of hydrogen whose temperature tends to rise due to the Joule-Thomson effect upon adiabatic expansion, the compressibility factor needs to be calculated using a state equation reflecting such tendency. Equations <NUM> to <NUM> are used which are special hydrogen state equations developed according to an embodiment of the disclosure. According to Equations <NUM> to <NUM>, the pressure ( <MAT>) and state of charge (SOC) of the hydrogen tank <NUM> may be obtained. Here, R is the universal gas constant which is defined in Table <NUM>. <MAT> <MAT> <MAT>.

The dispenser controller <NUM> may determine the maximum mass flow corresponding to the maximum hydrogen flow rate of the data hydrogen moving device <NUM> and the maximum pressure and maximum temperature of the hydrogen tank <NUM>. The mass flow ( <MAT>) of the data hydrogen moving device <NUM>, the pressure ( <MAT>) of the hydrogen tank <NUM>, and the temperature ( <MAT>) of the hydrogen tank <NUM>, which have been calculated in the above steps are compared with their respective immediately prior maximum values, determining the maximum mass flow ( <MAT>), the maximum hydrogen tank temperature ( <MAT>), and the maximum hydrogen tank pressure ( <MAT>). According to hydrogen fueling safety standards, regulations require that the safety thresholds be not exceeded during hydrogen fueling, as well as at the time of termination of hydrogen fueling. Thus, according to an embodiment of the disclosure, the maximum mass flow ( <MAT>), the maximum hydrogen tank temperature ( <MAT>), and the maximum hydrogen tank pressure ( <MAT>) are set as variables to be controlled.

The order of the above-described steps S4100 to S4600 is merely an example, and embodiments of the disclosure are not limited thereto. In other words, the above-described steps S4100 to S4600 may be performed in a different order, or some of the steps may be simultaneously performed or omitted.

What is not described regarding the hydrogen fueling method based on real-time communication of a CHSS for fuel cells in connection with <FIG> and <FIG> is the same or easily inferred from what has been described regarding the hydrogen fueling method based on real-time communication of a CHSS for fuel cells in connection with <FIG> and <FIG>, and no detailed description thereof is thus presented.

Claim 1:
A hydrogen fueling method performed by a dispenser (<NUM>), comprising:
obtaining initial state values from a hydrogen supply unit (<NUM>) of the dispenser (<NUM>) and at least one hydrogen tank (<NUM>) of a compressed hydrogen storage system, CHSS (<NUM>);
calculating (S4000) a mass flow, a temperature of the hydrogen tank (<NUM>) and a pressure of the hydrogen tank (<NUM>), and a state of charge, SOC, using a pre-stored thermodynamic model based on the initial state values;
obtaining each difference, if the calculated SOC is equal to or more than a preset SOC (S3300), wherein the each difference comprises:
a first difference between the calculated mass flow and a prestored first safety threshold,
a second difference between the calculated temperature of the hydrogen tank (<NUM>) and a prestored second safety threshold, and
a third difference between the calculated pressure of the hydrogen tank (<NUM>) and a prestored third safety threshold;
determining (<NUM>, S3500), based on the each difference, whether to reduce, increase, or maintain a pressure ramp rate applied when the mass flow, the temperature and the pressure is calculated,
wherein the hydrogen fueling method further comprises:
when a preset time elapses, repeating steps of the calculating (S4000), the obtaining and the determining (S3400, S3500).