JP2020008041A - Hydrogen charging method and hydrogen charging completion timing determination device - Google Patents

Abstract

To precisely complete charging of hydrogen.SOLUTION: When carrying out hydrogen charging from a hydrogen supply source to one or more hydrogen storage alloy containers, a timing of completing the hydrogen charging in the hydrogen storage alloy container in question is determined on the basis of variation of a predetermined physical quantity according to the hydrogen charging, as for the timing of completion, the completion timing or remaining time to the completion is determined.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hydrogen filling method and a hydrogen filling completion timing judging device when filling a hydrogen storage alloy container with hydrogen.

A hydrogen storage container such as a canister or a tank containing a hydrogen storage alloy is filled with hydrogen and used repeatedly. In the hydrogen filling of the hydrogen storage container, there is a demand to appropriately judge the completion time of the hydrogen filling.
For example, Patent Literature 1 proposes a device that adjusts a hydrogen flow rate so as to keep the temperature of a hydrogen storage alloy container constant, and completes hydrogen charging when a full storage pressure based on the PCT characteristics of the hydrogen storage alloy is reached. I have.
Further, in Patent Document 2, any one of a hydrogen storage container temperature, a cooling medium temperature, and a hydrogen storage container surface distortion, which change with the progress of filling of hydrogen, is measured as a predetermined physical quantity at predetermined time intervals, and a time change of the physical quantity is measured. There has been proposed a hydrogen filling method in which the estimated filling time of the hydrogen is calculated by fitting to an approximate expression.

JP-A-8-128597 Japanese Patent No. 4753244

  However, in the hydrogen filling method proposed in Patent Document 1, when hydrogen is charged into a hydrogen storage container having a different remaining amount of hydrogen each time, the pressure, temperature, or hydrogen flow rate of the storage container connected to the filling device is periodically changed. It is necessary to check to determine whether or not the filling is completed, and it is difficult to perform an efficient filling operation when filling a plurality of containers continuously with hydrogen. Further, there is a problem in that it is not known when the hydrogen filling is completed, and the user is restrained during the filling. Furthermore, although the completion of the filling can be known to a certain degree of accuracy, since the hydrogen flow rate is adjusted as needed so that the temperature of the hydrogen storage container becomes constant, the filling time becomes longer than when the hydrogen flow rate is not adjusted, There is also a problem that the equipment cost is increased.

  In the hydrogen filling method proposed in Patent Literature 2, a method of measuring at predetermined time intervals and fitting a temporal change of a physical quantity to an approximate expression requires a large computational load on a processing device and general data such as PLC. The recording / processing device has a problem that it cannot be implemented.

  In order to solve the above-described problems, the present invention provides a hydrogen storage device that can accurately determine when hydrogen filling is completed in a target hydrogen storage alloy container based on a change in a predetermined physical quantity according to hydrogen filling. It is an object of the present invention to provide a filling method and a hydrogen filling completion timing determination device.

  That is, in the hydrogen filling method of the present invention, the first embodiment is characterized in that when hydrogen is charged from a hydrogen supply source to one or a plurality of hydrogen storage alloy containers, a change in a predetermined physical quantity according to the hydrogen charging is performed. Based on this, it is determined when hydrogen filling is completed in the hydrogen storage alloy container of interest.

  According to another aspect of the invention of the hydrogen filling method, in the above aspect of the invention, the time when the hydrogen filling is completed indicates a time point when the hydrogen filling is completed.

  Another aspect of the invention of the hydrogen filling method is that, in the invention of the above aspect, a completion regulation hydrogen flow rate at which filling is completed from the predetermined physical quantity is determined in advance, and when a current hydrogen flow rate is equal to or less than the completion regulation hydrogen flow rate, It is determined that hydrogen filling has been completed.

  According to another aspect of the invention of the hydrogen filling method, in the above aspect of the invention, the timing at which the hydrogen filling is completed indicates a remaining time until the hydrogen filling is completed.

  Another aspect of the invention of the hydrogen filling method is the invention of the above aspect, wherein a difference between the hydrogen filling amount at the time of completion of filling in the hydrogen storage alloy container and a current hydrogen filling amount is obtained, and this difference is calculated by a current hydrogen flow rate. And calculating a remaining time until hydrogen filling is completed.

  In another aspect of the invention of a hydrogen filling method according to the aspect of the invention, in the calculation procedure, the calculation procedure is performed when a current hydrogen flow rate is equal to or higher than a control hydrogen flow rate.

  According to another aspect of the invention, there is provided a hydrogen filling method in which, when the current hydrogen flow rate is equal to or higher than a control hydrogen hydrogen flow rate, the hydrogen flow rate is controlled to a control water amount and supplied to the hydrogen storage alloy.

  Another aspect of the invention of the hydrogen filling method is the invention of the above aspect, wherein the hydrogen filling completion time is determined by the predetermined physical quantity, and a difference between the hydrogen filling completion time and a data collection interval for acquiring hydrogen flow rate data is obtained. The remaining time until hydrogen filling is completed is calculated.

  In another aspect of the invention, there is provided a hydrogen filling method according to the above aspect, wherein the remaining time is calculated when the current hydrogen flow rate is less than the control hydrogen flow rate.

  According to another aspect of the invention, there is provided a hydrogen filling method according to the above aspect, wherein the predetermined physical quantity includes a filling pressure of a hydrogen storage alloy container, a temperature of a cooling medium supplied to the hydrogen storage alloy container, and a number of hydrogen storage alloy containers. One or more.

Among the hydrogen filling completion timing determination devices of the present invention, a first mode is a flow rate measuring device that measures the flow rate of hydrogen supplied from a hydrogen supply source to one or more hydrogen storage alloy containers,
A temperature measuring device for measuring the temperature of the refrigerant sent to the hydrogen storage alloy,
A pressure gauge for measuring hydrogen filling pressure in the hydrogen storage alloy,
The flow rate measuring device, the temperature measuring device, and a control unit that receives a measurement result of the pressure gauge and determines a time at which hydrogen filling of the target hydrogen storage alloy container is completed with hydrogen.

  Another aspect of the invention of a hydrogen filling completion timing determining apparatus according to the invention of the above aspect further includes a flow control valve for setting the hydrogen flow rate to a predetermined control hydrogen flow rate.

  According to another aspect of the invention of the hydrogen filling completion timing determining apparatus, in the invention of the above aspect, the control unit calculates a hydrogen filling completion time or a hydrogen filling completion remaining time.

According to the method for filling hydrogen into a hydrogen storage container of the present invention, the physical quantities that change upon filling with hydrogen include a hydrogen flow rate, a pressure at the time of filling the hydrogen storage alloy container, a temperature of a cooling medium for the hydrogen storage alloy container, and a hydrogen storage alloy. One or more physical quantities, such as the number of containers, can be determined.
The physical quantity may be determined beforehand or measured at the time of filling with hydrogen.

  In the case where the hydrogen filling is previously determined, the hydrogen flow at the time when the hydrogen filling is considered to be completed can be set to the specified hydrogen flow by measuring the physical quantity, and the timing for determining that the hydrogen filling is completed at the time of filling with hydrogen can be known. . When determining the prescribed hydrogen flow rate, as a criterion for determining that hydrogen filling is completed, a method of calculating from the product of the hydrogen transfer amount and the alloy filling amount obtained from the PCT diagram of the hydrogen storage alloy is considered. Can be However, the present invention is not limited to this standard, and the specified hydrogen flow rate can be set based on an appropriate standard.

  Further, a physical quantity can be measured at the time of filling with hydrogen. At this time, the hydrogen filling completion time can be predicted based on the temperature of the cooling medium, the pressure of the hydrogen storage alloy container, the number of hydrogen storage alloy containers, and the like. Using this completion time, the remaining time until hydrogen filling is completed can be known.

(Hydrogen flow rate)
Since the internal pressure of the container is lower than the filling pressure in the initial stage of filling, a large amount of hydrogen flows due to the differential pressure. Thereafter, as the differential pressure decreases, the hydrogen flow rate decreases, and the hydrogen filling is completed.
The hydrogen flow rate can be measured by a flow meter or the like.

(Hydrogen pressure)
FIG. 2 also shows a temporal change with the filling of the pressure in the hydrogen storage container. Immediately after the start of filling, the pressure in the container rises rapidly until it becomes almost the same value as the filling pressure. This is because the hydrogen storage material has a low hydrogen absorption rate and an excessive supply of hydrogen, so that there is almost no pressure difference between the filling pressure and the pressure in the container. The hydrogen pressure can be measured by, for example, a pressure gauge.

(Refrigerant temperature)
When filling with hydrogen, a refrigerant is used to cool the hydrogen storage alloy in the hydrogen storage alloy container to promote hydrogen filling. Since the hydrogen absorption equilibrium pressure of the hydrogen storage alloy increases with temperature, when the equilibrium pressure reaches a temperature that balances with the charged hydrogen pressure, hydrogen absorption stops, and the temperature does not further rise. On the other hand, when the heat of the hydrogen storage alloy is deprived by the refrigerant from the surface of the container or the like, the increase in the hydrogen absorption equilibrium pressure is suppressed, and hydrogen is filled. When the filling is completed, the container temperature becomes constant at the cooling medium temperature. The temperature of the refrigerant can be measured by a thermometer or the like.

  In addition to the above physical quantities, any physical quantity that changes with the progress of hydrogen filling can be used as a measurement target in addition to the above. The physical quantity may be anything that can be measured using a known measuring device such as a measuring device, and the present invention is not particularly limited in the configuration of the measuring device.

The physical quantity data can be recorded in a programmable computer or the like together with the elapsed time data when measuring in advance or when actually performing a hydrogen filling operation. The storage can be performed in a storage device such as a RAM, a flash memory, and an HDD that can be written and read at any time, and it is possible to determine when hydrogen filling is completed. That is, it is possible to determine the point of time when the hydrogen filling is completed or to determine the remaining time until the hydrogen filling is completed.
By knowing the completion point of hydrogen filling, hydrogen filling can be terminated, and at the end, manual stop or automatic stop by the control unit can be performed. The hydrogen filling operation can be safely performed by completing the hydrogen filling at an appropriate time.

  Further, when the remaining time until the completion of the hydrogen filling is known, preparation for the completion of the hydrogen filling can be made, and the filling completion processing can be performed at an appropriate time. The remaining time can be displayed on the display unit or notified by a terminal or the like via a network to prepare for the completion of filling.

  ADVANTAGE OF THE INVENTION According to this invention, the completion time of hydrogen filling can be accurately grasped, hydrogen filling can be performed automatically if desired, and the remaining time of filling can be grasped. There is an effect that time can be used effectively without doing.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which performs the hydrogen filling method of one Embodiment of this invention, and shows the outline of the hydrogen filling apparatus provided with the hydrogen filling completion time determination apparatus of one Embodiment similarly. FIG. 4 is a graph showing a hydrogen filling amount, a hydrogen flow rate, a hydrogen filling pressure, and a refrigerant temperature that change with the progress of hydrogen filling. 4 is a graph showing a relationship between a specified hydrogen flow rate and a hydrogen charging pressure based on a refrigerant temperature. 4 is a graph showing a relationship between a hydrogen filling completion time and a hydrogen filling pressure based on a refrigerant temperature. 5 is a flowchart illustrating an example of a procedure for obtaining a remaining time of hydrogen filling completion. 5 is a graph showing a hydrogen filling amount, a hydrogen flow rate, and a hydrogen filling pressure that change with the progress of filling in an example. 5 is a graph showing a relationship between a specified hydrogen flow rate and a hydrogen charging pressure based on a refrigerant temperature in the example. 5 is a graph showing a relationship between a specified hydrogen flow rate and the number of fuel cases in the example. 4 is a graph illustrating a relationship between a remaining time of filling and a hydrogen filling pressure in the example. 5 is a graph showing a change over time in the hydrogen filling amount and the hydrogen flow rate in the example, and a graph showing a result of comparison between the remaining time at the time of prediction and the remaining time of the actual measurement.

An embodiment of the present invention will be described below with reference to the accompanying drawings.
The hydrogen filling apparatus 100 shown in FIG. 1 includes a hydrogen cylinder 1 as a hydrogen supply source, a hydrogen supply path 1A, and a plurality of fuel cases 11 having a plurality of hydrogen storage alloy containers 12. A plurality of hydrogen storage alloy containers 12 are connected in parallel to the other end of the hydrogen supply path 1A to which one end is connected. The hydrogen storage alloy container 12 is constituted by a canister or a tank, respectively. A hydrogen storage alloy (not shown) is accommodated inside the hydrogen storage alloy container 12.

In the fuel case 11, a refrigerant flow path 13 is connected. In the refrigerant flow path 13, the refrigerant introduced into the hydrogen storage alloy container 12 cools the hydrogen storage alloy in the hydrogen storage alloy container 12 and is then discharged. After that, it is circulated so as to be introduced again into the hydrogen storage alloy container 12 side.
On the refrigerant flow passage discharge side, a thermometer 8 for measuring the temperature of the refrigerant in the refrigerant flow passage 13 is provided, and further, a cooler 9 for cooling the refrigerant and a refrigerant flow meter 10 are interposed.
The method of cooling the hydrogen storage alloy container 12 may be either an external cooling type in which the container is cooled from the outside or an internal cooling type, and the structure of the hydrogen storage alloy container is particularly limited as the present invention. Not something.

In the hydrogen supply path 1A, between the hydrogen cylinder 1 and the hydrogen storage alloy container 12, the manual valve 2, the pressure regulating valve 3, the electromagnetic on-off valve 4, the hydrogen The flow meter 5, the solenoid on-off valve 6, and the pressure transmitter 7 are interposed in this order.
The electromagnetic on-off valve 4 and the electromagnetic on-off valve 6 are controllably connected to the control unit 110 and open / close operation is controlled. Further, the measured values of the hydrogen flow meter 5 and the pressure transmitter 7 can be transmitted to the control unit 110.
Further, the measurement value of the thermometer 8 can be transmitted to the control unit 110.

  The control unit 110 is configured by a PLC (Programmable logic controller) or the like. The control unit 110 further includes a timer for measuring the elapsed time, and a storage unit (not shown) such as a flash memory or an HDD for storing and reading data.

The control unit 110 can receive the measurement results of the physical quantities obtained by the hydrogen flow meter 5, the pressure transmitter 7, and the thermometer 8 described above.
These physical quantities can be acquired before the actual hydrogen filling, and set values and the like for determining the hydrogen filling completion timing can be created.

When filling with hydrogen, the manual valve 2 is opened, a predetermined pressure is set by the pressure adjusting valve 3, the electromagnetic on / off valves 4, 6 are opened, and hydrogen is transferred through the hydrogen supply path 1A. The flow rate at this time is measured by the hydrogen flow meter, and the measurement result is transmitted to the control unit 110. The pressure in the hydrogen supply passage near the hydrogen storage alloy container 12 is measured by the pressure transmitter 7 and transmitted to the control unit 110. Hydrogen is filled into each hydrogen storage alloy container from the hydrogen supply path 1A and stored in the hydrogen storage alloy. At this time, the refrigerant is sent to the hydrogen storage alloy container 12 through the refrigerant flow path 13 and cools the hydrogen storage alloy, which is heated by the storage of hydrogen, to promote hydrogen storage. After cooling the hydrogen storage alloy container 12, the temperature of the refrigerant is measured by the thermometer 8 on the return path of the refrigerant channel 13 and is sent to the cooler 9. The measurement result of the thermometer 8 is sent to the control unit 110. Can be
In the cooler 9, the refrigerant is cooled to a predetermined temperature, the flow rate is measured by the refrigerant flow meter 10 on the outward path of the refrigerant flow path 13, and sent to the hydrogen storage alloy container 12 again to cool the hydrogen storage alloy. The above operation is repeated to cool the hydrogen storage alloy to a predetermined temperature while filling with hydrogen.

FIG. 2 shows the change over time in the amount of charged hydrogen with the filling of hydrogen.
As described above, since the pressure inside the container is lower than the filling pressure in the initial stage of filling, a large amount of hydrogen (Fpv) flows due to the differential pressure, and when the flow rate is controlled, the control hydrogen flow rate (Fsp) becomes t1. For a period of time. Thereafter, as shown in the second and third stages of FIG. 2, the hydrogen flow rate decreases as the differential pressure decreases, and the hydrogen flow rate gradually decreases when the hydrogen flow rate becomes smaller than the control hydrogen flow rate. Here, assuming that the time point at which the flow control becomes impossible is A and the time point at which the filling is completed is B, t1 is represented by A and t2 is represented by BA.
At this time, as shown in the third stage of FIG. 2, the filling pressure rapidly increases in the initial stage of the filling, then the pressure rise becomes slow, and becomes constant when the filling is completed. Further, as shown in the fourth stage of FIG. 2, the refrigerant temperature is within a certain range.

In addition, Q in the figure indicates the hydrogen filling amount, Qpv indicates the current hydrogen filling amount, and Qpre indicates the rated hydrogen filling amount.
F is the hydrogen flow rate, Fpv is the current hydrogen flow rate, Fpre is the specified hydrogen flow rate, Fsp is the control hydrogen flow rate,
P indicates the hydrogen filling pressure, and T indicates the refrigerant inlet temperature.

  In carrying out the present embodiment, in a predetermined container, parameters related to hydrogen filling, a refrigerant inlet temperature (T), a hydrogen filling pressure (P), a hydrogen flow rate (F), a hydrogen filling quantity (Q, a hydrogen flow rate The change with time of the integrated value is measured, and the value of each parameter when the hydrogen filling amount reaches the rated hydrogen filling amount (Qpre) is calculated. Next, as shown in FIG. 3, the relationship between the hydrogen filling pressure and the specified hydrogen flow rate (Fpre) is summarized for each refrigerant temperature. As a result of the test, it has been confirmed that the relationship between the two can be approximated by a linear function. The primary equation is input to the control unit of the actual hydrogen filling apparatus, and the hydrogen filling is automatically performed. When the hydrogen flow rate (F) falls below the specified hydrogen flow rate, the hydrogen filling is completed.

Next, a method of estimating the completion time of hydrogen filling will be described.
From the results of FIG. 2, the relationship between the hydrogen filling pressure P and t2 is plotted in advance for each refrigerant temperature, as shown in FIGS. As a result of the test, it has been confirmed that the relationship between the two can be approximated by a linear function. Based on these, the remaining filling time (trem) can be calculated as shown in FIG.
That is, when Fpv ≧ Fsp, trem is provisionally calculated by subtracting the current value (Qpv) of the hydrogen filling amount from Qpre and dividing by the current value (Fpv) of the hydrogen flow rate. can do.
On the other hand, when Fpv <Fsp, trem can be obtained by subtracting the integrated value (tint) of the data collection interval from the time point A from t2. t2 is obtained in advance by calculation or experience.
In the figure, trem indicates the remaining time of filling, and tint indicates the data collection interval.

  Note that, in the above-described embodiment, an embodiment in which a plurality of hydrogen storage alloy containers are provided has been described. However, the present invention can be applied to a case in which one hydrogen storage alloy container is provided. . In Patent Document 2, the estimated time until the filling is completed is sequentially calculated. For example, when measuring the surface temperature of a container, it is necessary to attach a temperature sensor to each container, and a plurality of hydrogen storage alloys are required. There is a problem that it is difficult to perform an efficient filling operation in a container provided with a container. However, in the present embodiment, it is possible to perform an efficient filling operation even for a device including a plurality of hydrogen storage alloy containers.

Hereinafter, examples of the present invention will be described.
A hydrogen filling test was carried out using eight MH fuel cases each containing three MH canisters filled with a hydrogen storage alloy (MH) having a rated hydrogen amount of 450 L and a cooling path as hydrogen storage alloy containers. The schematic configuration of the hydrogen filling device was the same as the device in FIG.

The charged hydrogen pressure was set to 0.6 MPaG, the refrigerant inlet temperature was set to 5 ° C., the refrigerant flow rate was set to 12 L / min, and the hydrogen flow rate during charging was controlled to 80 L / min.
FIG. 6 summarizes the changes over time in hydrogen filling pressure, hydrogen flow rate, and hydrogen filling amount. The flow rate can be controlled for about 40 minutes after the start of filling, but as the internal pressure of the container increases, the hydrogen flow rate gradually starts to decrease.

FIG. 7 summarizes the relationship between the hydrogen charging pressure and the specified hydrogen flow rate at the rated hydrogen charging amount under various conditions using the refrigerant temperature and the charging pressure as parameters. The charging pressure and the specified hydrogen flow rate are generally represented by a linear equation. FIG. 8 shows the relationship between the number of fuel cases (N) and the specified hydrogen flow rate while keeping the filling pressure and the refrigerant temperature constant. The relationship between the number of fuel cases and the specified hydrogen flow rate is also substantially expressed by a linear equation. It is.
From the above results, the relationships among the specified hydrogen flow rate, the charging pressure, the refrigerant temperature, and the number of cases are shown below.

Fpre = {(K1 + K2 × T) + (K3 + K4 × T) × P} × (K5 × N + K6) (Equation 1)
Here, K1 to K6 are constants.
If Fpv is equal to or less than Fpre, the hydrogen filling is completed by closing the electromagnetic on-off valve supplying hydrogen.

Next, a method of estimating the remaining time of the hydrogen filling time will be described.
After a certain period of time after filling with hydrogen, the current value of the hydrogen flow rate (Fpv) is compared with the control hydrogen flow rate (Fsp). In the period in which Fpv is greater than Fsp, the remaining charge time (trem) is obtained by subtracting the current value of the hydrogen charge (Qpv) from the rated hydrogen charge (Qpre) by the current value of the hydrogen flow rate (Fpv). Required provisionally. Thereby, it is possible to prepare for the completion of filling. Note that if the hydrogen flow rate (Fpv) falls below the control hydrogen flow rate (Fsp), the state will be different from the above premise, and correction is required.
That is, during a period in which Fpv is smaller than Fsp, t2 can be calculated more accurately by subtracting the data collection interval (tint) from t2 by calculating t2 using Expression 2 described later.
Regarding t2, the relationship between the refrigerant temperature, the charging pressure and t2 is as shown in FIG. 9, and the charging pressure and t2 are generally expressed by a linear relationship.

t2 = {(L1 + L2 × T) + (L3 + L4 × T) × P} × (L5 × N + L6) (Equation 2)
Here, L1 to L6 are constants.
The remaining time trem until the filling is completed can be obtained by subtracting tint from t2.

  FIG. 10 shows the results of hydrogen filling at a hydrogen filling pressure of 0.8 MPaG, a refrigerant temperature of 5 ° C., and a refrigerant flow rate of 12 L / min. It was confirmed that hydrogen filling was almost completed at the rated hydrogen filling amount, and that the remaining time of the filling was in good agreement with the actual measurement.

DESCRIPTION OF SYMBOLS 1 Container 1 Hydrogen cylinder 1A Hydrogen supply path 2 Manual valve 3 Pressure regulating valve 4 Solenoid on-off valve 5 Hydrogen flow meter 6 Solenoid on-off valve 7 Pressure transmitter 8 Thermometer 9 Cooler 10 Refrigerant flow meter 11 Fuel case 12 Hydrogen storage alloy container 13 Refrigerant flow path 100 Hydrogen filling device 110 Control unit

Claims (13)

  When filling one or more hydrogen storage alloy containers with hydrogen from a hydrogen supply source, hydrogen filling is completed in the target hydrogen storage alloy container based on a change in a predetermined physical quantity according to the hydrogen filling. Hydrogen filling method to judge when.   2. The hydrogen filling method according to claim 1, wherein the time when the hydrogen filling is completed indicates a time when the hydrogen filling is completed.   3. The hydrogen filling method according to claim 2, wherein a prescribed hydrogen flow rate at which filling is completed based on the predetermined physical quantity is determined in advance, and when the current hydrogen flow rate becomes equal to or less than the prescribed hydrogen flow rate, it is determined that hydrogen filling is completed.   The hydrogen filling method according to any one of claims 1 to 3, wherein the timing at which the hydrogen filling is completed indicates a remaining time until the hydrogen filling is completed.   Calculation of calculating the difference between the hydrogen filling amount at the time of filling completion in the hydrogen storage alloy container and the current hydrogen filling amount, dividing the difference by the current hydrogen flow rate, and calculating the remaining time until the hydrogen filling is completed. 5. The hydrogen filling method according to claim 4, comprising a procedure.   The hydrogen filling method according to claim 5, wherein the calculating step is performed when a current hydrogen flow rate is equal to or higher than a control hydrogen flow rate.   7. The hydrogen filling method according to claim 6, wherein when the current hydrogen flow rate is equal to or higher than the control hydrogen flow rate, the hydrogen flow rate is controlled to the control hydrogen flow rate and supplied to the hydrogen storage alloy.   The hydrogen filling completion time is determined by the predetermined physical quantity, and a remaining time until the hydrogen filling is completed is calculated based on a difference between the hydrogen filling completion time and a data collection interval for acquiring hydrogen flow rate data. Hydrogen filling method.   9. The hydrogen filling method according to claim 8, wherein the remaining time is calculated when a current hydrogen flow rate is less than a control hydrogen flow rate.   The said physical quantity is one or more of the filling pressure of a hydrogen storage alloy container, the temperature of the cooling medium supplied to a hydrogen storage alloy container, and the number of hydrogen storage alloy containers. Hydrogen filling method. A flow rate measuring device for measuring a flow rate of hydrogen supplied from the hydrogen supply source to one or more hydrogen storage alloy containers,
A temperature measuring device for measuring the temperature of the refrigerant sent to the hydrogen storage alloy,
A pressure gauge for measuring hydrogen filling pressure in the hydrogen storage alloy,
Hydrogen filling completion comprising: the flow rate measuring device, the temperature measuring device, and a control unit that receives a measurement result of the pressure gauge, and determines a timing at which hydrogen filling is completed for the target hydrogen storage alloy container. Timing device.   The hydrogen filling completion timing judging device according to claim 11, further comprising a flow control valve for setting the hydrogen flow to a predetermined control hydrogen flow. 13. The hydrogen filling completion timing determining device according to claim 12, wherein the control unit calculates the hydrogen filling completion time or the hydrogen filling completion remaining time.

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