JP7145662B2 - Hydrogen filling method and hydrogen filling completion time determination device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hydrogen filling method and a hydrogen filling completion time determination device for filling a hydrogen storage alloy container with hydrogen.

Hydrogen storage containers such as canisters and tanks containing hydrogen storage alloys are used repeatedly after being filled with hydrogen. When filling the hydrogen storage container with hydrogen, there is a demand to appropriately determine the completion time of hydrogen filling.
For example, Patent Document 1 proposes a device that adjusts the hydrogen flow rate so as to keep the temperature of the hydrogen storage alloy container constant, and completes hydrogen filling when the full filling pressure based on the PCT characteristics of the hydrogen storage alloy is reached. there is
Further, in Patent Document 2, any one of the temperature of the hydrogen storage container, the temperature of the cooling medium, and the surface strain of the hydrogen storage container, which change according to the progress of hydrogen filling, is measured as a predetermined physical quantity every predetermined time, and the time change of the physical quantity is measured. A hydrogen filling method has been proposed in which a predicted time for completion of hydrogen filling is calculated by fitting to an approximation formula.

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

However, in the hydrogen filling method proposed in Patent Document 1, when hydrogen is filled into a hydrogen storage container with a different amount of remaining hydrogen each time, the pressure, temperature, or hydrogen flow rate of the storage container connected to the filling device is periodically adjusted. It is necessary to check whether the filling is completed or not, and when filling a plurality of containers with hydrogen in succession, efficient filling work is difficult. In addition, there is a problem that it is not known when the hydrogen filling will be completed, and the user is restrained during the filling. Furthermore, although the completion of filling can be known to some extent accurately, since the hydrogen flow rate is adjusted at any time so that the temperature of the hydrogen storage container remains constant, the filling time is longer than when the hydrogen flow rate is not adjusted. There is also a problem that the cost of the device increases.

In the hydrogen filling method proposed in Patent Document 2, the method of measuring every predetermined time and fitting the time change of the physical quantity to an approximate expression has a large calculation load on the processing device, and general data such as PLC is used. There is a problem that it cannot be implemented in the recording/processing device.

In order to solve the above-described problems, the present invention provides a hydrogen storage container capable of accurately determining when the hydrogen storage alloy container to be filled with hydrogen is completed, based on a change in a predetermined physical quantity according to the hydrogen filling. An object of the present invention is to provide a filling method and a hydrogen filling completion time determination device.

That is, in the first aspect of the hydrogen filling method of the present invention, when one or more hydrogen storage alloy containers are filled with hydrogen from a hydrogen supply source, the change in a predetermined physical quantity according to the hydrogen filling is A hydrogen filling method for determining when hydrogen filling is completed in the target hydrogen-absorbing alloy container based on
The time when hydrogen filling is completed indicates the remaining time until hydrogen filling is completed,
Calculate the difference between the hydrogen filling amount at the completion of filling in the hydrogen storage alloy container and the current hydrogen filling amount, divide this difference by the current hydrogen flow rate, and calculate the remaining time until hydrogen filling is completed. have a procedure,
The calculation procedure is performed when the current hydrogen flow rate is greater than or equal to the control hydrogen flow rate .
According to another aspect of the present invention, there is provided a hydrogen filling method, in which, when the current flow rate of hydrogen 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 invention of another form of hydrogen filling method is targeted based on the change of a predetermined physical quantity according to hydrogen filling when hydrogen is filled from a hydrogen supply source into one or a plurality of hydrogen storage alloy containers. A hydrogen filling method for determining when hydrogen filling is completed in the hydrogen storage alloy container,
The time when hydrogen filling is completed indicates the remaining time until hydrogen filling is completed,
When the current hydrogen flow rate is less than the control hydrogen flow rate, the hydrogen filling completion time is determined by the predetermined physical quantity, and the difference between the hydrogen filling completion time and the integrated value of the data collection interval for acquiring the hydrogen flow rate data is used to determine the hydrogen flow rate. Calculate the remaining time until the filling is complete.

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

In another aspect of the hydrogen filling method invention, in the above aspect of the invention, a prescribed hydrogen flow rate for completion of filling is determined in advance from the predetermined physical amount, and when the current hydrogen flow rate becomes equal to or less than the prescribed completion hydrogen flow rate, Determine that hydrogen filling is complete.

The hydrogen filling method invention of another form is the invention of the above form, wherein the predetermined physical quantity is the filling pressure of the hydrogen-absorbing alloy container, the temperature of the cooling medium supplied to the hydrogen-absorbing alloy container, and the number of the hydrogen-absorbing alloy containers. One or more.

Among the hydrogen filling completion time determination devices of the present invention, the first form comprises a flow rate measuring device for measuring 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 that measures the hydrogen filling pressure in the hydrogen storage alloy,
the flow rate measuring device, the temperature measuring device, and a control unit that receives the measurement result of the pressure gauge and determines when the target hydrogen-absorbing alloy container is filled with hydrogen ;
When the current hydrogen flow rate is equal to or higher than the control hydrogen flow rate, the control unit obtains the difference between the hydrogen filling amount at the completion of filling in the hydrogen storage alloy container and the current hydrogen filling amount, and calculates the difference as the current hydrogen filling amount. Divide by the flow rate to calculate the remaining time until hydrogen filling is completed .
Another aspect of the invention of a hydrogen filling completion timing determination device comprises a flow rate measuring device for measuring 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 that measures the hydrogen filling pressure in the hydrogen storage alloy,
the flow rate measuring device, the temperature measuring device, and a control unit that receives the measurement result of the pressure gauge and determines when the target hydrogen-absorbing alloy container is filled with hydrogen;
When the current hydrogen flow rate is less than the control hydrogen flow rate, the control unit determines the remaining time until hydrogen filling is completed by the difference between the time when hydrogen filling is completed and the integrated value of the data collection interval for acquiring hydrogen flow rate data. calculate.

According to another aspect of the present invention, there is provided a hydrogen filling completion timing determination apparatus according to the aspect of the invention, further comprising a flow rate control valve for setting the hydrogen flow rate to a predetermined controlled hydrogen flow rate.

According to another aspect of the invention, there is provided a hydrogen filling completion timing determination device according to the above aspect of the invention, wherein the control unit calculates the hydrogen filling completion time point or the remaining time for hydrogen filling completion.

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

If it is obtained in advance, the hydrogen flow rate at the time when hydrogen filling is considered to be completed is determined by measuring the physical quantity, and the timing for determining that hydrogen filling is completed can be known at the time of hydrogen filling. . When determining the specified 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 obtained from the PCT diagram of the hydrogen storage alloy and the alloy filling amount can be considered. be done. However, the present invention is not limited to this standard, and the specified hydrogen flow rate can be set according to an appropriate standard.

Also, a physical quantity may be measured at the time of hydrogen filling. In this case, the hydrogen filling completion time can be predicted from the temperature of the cooling medium, the pressure of the hydrogen absorbing alloy container, the number of hydrogen absorbing alloy containers, and the like. Using this completion time, it is possible to know the remaining time until the completion of hydrogen filling.

(hydrogen flow rate)
Since the internal pressure of the container is lower than the filling pressure at the beginning of filling, a large amount of hydrogen flows due to the pressure difference.
The hydrogen flow rate can be measured with a flow meter or the like.

(hydrogen pressure)
FIG. 2 also shows the change over time of the internal pressure of the hydrogen storage container as the hydrogen storage container is filled. Immediately after the start of filling, the internal pressure of the container rises sharply until it reaches almost the same value as the filling pressure. This is because the hydrogen absorption rate of the hydrogen storage material is low and hydrogen is excessively supplied, so that almost no pressure difference occurs between the filling pressure and the pressure inside the container. The hydrogen pressure can be measured, for example, with a pressure gauge.

(refrigerant temperature)
A refrigerant is used to cool the hydrogen-absorbing alloy in the hydrogen-absorbing alloy container during hydrogen filling to facilitate hydrogen filling. Since the hydrogen absorption equilibrium pressure of the hydrogen storage alloy increases with temperature, hydrogen absorption stops when the equilibrium pressure reaches a temperature that balances with the filling hydrogen pressure, and the temperature does not rise any further. On the other hand, when the heat of the hydrogen absorbing alloy is taken away by the refrigerant from the surface of the container or the like, the increase in the hydrogen absorption equilibrium pressure is suppressed, and the filling of hydrogen is performed. When filling is completed, the container temperature becomes constant at the cooling medium temperature. The temperature of the coolant can be measured with a thermometer or the like.

In addition to the above physical quantities, physical quantities other than the above can be measured as long as they change according to the progress of hydrogen filling. The above-mentioned physical quantity may be measured using a measuring means such as a known measuring device, and the present invention is not particularly limited to the configuration of the measuring means.

Physical quantity data can be recorded in a programmable computer or the like together with elapsed time data when measuring in advance or when actually performing a hydrogen filling operation. The data can be stored in memory means such as RAM, flash memory, HDD, etc., which can be written and read at any time, and the hydrogen filling completion time can be determined. That is, it is possible to determine when the hydrogen filling is completed, and to determine the remaining time until the hydrogen filling is completed.
By grasping the hydrogen filling completion point, the hydrogen filling can be terminated, and at the termination, manual stop or automatic stop by the control unit can be performed. Hydrogen filling work can be safely performed by completing hydrogen filling at an appropriate time.

Further, when the remaining time until completion of hydrogen filling is known, it is possible to prepare for the completion of hydrogen filling and to perform filling end processing at an appropriate time. The remaining time can be displayed on the display unit or notified to the terminal or the like via the network so that the completion of filling can be prepared.

According to the present invention, it is possible to accurately grasp the completion time of hydrogen filling, to automatically perform hydrogen filling if desired, to grasp the remaining time of filling, and to constrain the user during filling. There is an effect that you can use your time effectively without doing anything.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram schematically showing a hydrogen filling apparatus that carries out a hydrogen filling method according to an embodiment of the present invention and also includes a hydrogen filling completion time determination device according to an embodiment; 5 is a graph showing the hydrogen charging amount, the hydrogen flow rate, the hydrogen charging pressure, and the refrigerant temperature, which change with the progress of the hydrogen charging. 4 is a graph showing the relationship between specified hydrogen flow rate and hydrogen filling pressure based on refrigerant temperature. 4 is a graph showing the relationship between hydrogen filling completion time and hydrogen filling pressure based on refrigerant temperature. FIG. 10 is a flow chart showing an example of a procedure for determining the time remaining until completion of hydrogen filling; FIG. 4 is a graph showing the hydrogen filling amount, hydrogen flow rate, and hydrogen filling pressure that change with the progress of filling in the example. 4 is a graph showing the relationship between specified hydrogen flow rate and hydrogen filling pressure based on refrigerant temperature in the example. 4 is a graph showing the relationship between the prescribed hydrogen flow rate and the number of fuel cases in the example. 4 is a graph showing the relationship between the remaining filling time and the hydrogen filling pressure in Examples. FIG. 10 is a graph showing changes over time in the hydrogen filling amount and the hydrogen flow rate, and a graph showing the result of comparison between the estimated remaining filling time and the measured remaining filling time in the example.

An embodiment of the present invention will be described below with reference to the accompanying drawings.
A hydrogen filling apparatus 100 shown in FIG. A plurality of hydrogen storage alloy containers 12 are connected in parallel to the other end of the hydrogen supply channel 1A to which one end is connected. The hydrogen-absorbing alloy container 12 is composed of a canister or a tank. A hydrogen storage alloy (not shown) is accommodated inside the hydrogen storage alloy container 12 .

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

In the hydrogen supply line 1A, between the hydrogen cylinder 1 and the hydrogen storage alloy container 12, from the hydrogen cylinder 1 side toward the hydrogen storage alloy container 12, the manual valve 2, the pressure control valve 3, the electromagnetic on-off valve 4, the hydrogen A flow meter 5, an electromagnetic on-off valve 6, and a 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 controller 110, and their opening and closing operations are controlled. Furthermore, the measured values of the hydrogen flow meter 5 and the pressure transmitter 7 can be transmitted to the control section 110 .
Also, the measured value of the thermometer 8 can be transmitted to the control section 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 elapsed time, and a storage unit such as a flash memory and an HDD (none of which are shown) for storing and reading data.

The control unit 110 can receive measurement results of 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 prior to actual hydrogen filling to create set values for judging the completion time of hydrogen filling.

When filling hydrogen, the manual valve 2 is opened, a predetermined pressure is set by the pressure regulating valve 3, and the electromagnetic on-off valves 4 and 6 are opened to transfer hydrogen through the hydrogen supply line 1A. The flow rate at this time is measured by a hydrogen flow meter and the measurement result is sent to the control unit 110 . Also, the pressure in the hydrogen supply path near the hydrogen storage alloy container 12 is measured by the pressure transmitter 7 and transmitted to the controller 110 . Hydrogen is filled into each hydrogen storage alloy container from the hydrogen supply channel 1A and is stored in the hydrogen storage alloy. At this time, the refrigerant is sent to the hydrogen-absorbing alloy container 12 through the refrigerant flow path 13 to cool the hydrogen-absorbing alloy heated by absorbing hydrogen, thereby promoting hydrogen absorption. After cooling the hydrogen-absorbing alloy container 12 , the coolant is sent to the cooler 9 after its temperature is measured by the thermometer 8 on the return path of the coolant flow path 13 . be done.
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 the refrigerant is sent to the hydrogen absorbing alloy container 12 again to cool the hydrogen absorbing alloy. The above operation is repeated to cool the hydrogen storage alloy to a predetermined temperature while hydrogen is being filled.

FIG. 2 shows the change over time in the amount of hydrogen filled with hydrogen.
As described above, at the beginning of filling, the internal pressure of the container is lower than the filling pressure, so a large amount of hydrogen (Fpv) flows due to the differential pressure, and when the flow rate is controlled, the controlled hydrogen flow rate (Fsp) is t1 is filled with hydrogen for . Thereafter, as shown in the second and third tiers of FIG. 2, the hydrogen flow rate decreases as the differential pressure decreases, and when the hydrogen flow rate becomes smaller than the control hydrogen flow rate, the hydrogen flow rate gradually decreases. Here, if A is the time when the flow rate control becomes impossible, and B is the time when the filling is completed, t1 is A and t2 is BA.
At this time, as shown in the third stage of FIG. 2, after the filling pressure rises sharply at the beginning of filling, the rise in pressure slows down and becomes constant at the completion of filling. Also, as shown in the fourth row of FIG. 2, the coolant temperature is within a certain range.

In the figure, Q is the hydrogen filling amount, Qpv is the current hydrogen filling amount, and Qpre is 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 controlled 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 in advance, the parameters related to hydrogen filling are refrigerant inlet temperature (T), hydrogen filling pressure (P), hydrogen flow rate (F), hydrogen filling amount (Q, hydrogen flow rate cumulative value) is measured, and the value of each parameter is calculated when the hydrogen charging amount reaches the rated hydrogen charging amount (Qpre). Next, as shown in FIG. 3, the relationship between the hydrogen charging pressure and the specified hydrogen flow rate (Fpre) is summarized for each refrigerant temperature. As a result of testing, it has been confirmed that the relationship between the two can be approximated by a linear function. This linear expression can be input to the control unit of the actual hydrogen filling device, hydrogen filling can be performed automatically, and hydrogen filling can be completed when the hydrogen flow rate (F) falls below the specified hydrogen flow rate.

Next, a method of predicting the hydrogen filling completion time will be described.
Based on the results of FIG. 2, the relationship between the hydrogen charging pressure P and t2 is plotted in advance for each refrigerant temperature, as shown in FIGS. As a result of testing, 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 temporarily calculates the remaining filling time (trem) by subtracting the current value of the hydrogen filling amount (Qpv) from Qpre and dividing it by the current value of the hydrogen flow rate (Fpv). 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 time A from t2. t2 is obtained in advance by calculation or experience.
In the figure, trem indicates the remaining filling time, and tint indicates the data collection interval.

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

Examples of the present invention are described below.
A hydrogen filling test was carried out using eight MH fuel cases each having a built-in cooling channel in three MH canisters filled with a hydrogen storage alloy (MH) having a rated hydrogen capacity of 450 L as hydrogen storage alloy containers. The schematic configuration of the hydrogen filling device was the same as that of the device shown in FIG.

The filling hydrogen pressure was set at 0.6 MPaG, the refrigerant inlet temperature was set at 5° C., and the refrigerant flow rate was set at 12 L/min, and the hydrogen flow rate during filling was controlled at 80 L/min.
Fig. 6 summarizes 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 rises, the hydrogen flow rate begins to decrease gradually.

FIG. 7 summarizes the relationship between the hydrogen filling pressure and the specified hydrogen flow rate at the rated hydrogen filling amount under various conditions, using the refrigerant temperature and filling pressure as parameters. The filling pressure and the specified hydrogen flow rate are generally expressed by a linear relationship. Fig. 8 shows the relationship between the number of fuel cases (N) and the specified hydrogen flow rate with the filling pressure and coolant temperature constant. be
Based on the above results, the relationship between the specified hydrogen flow rate, filling pressure, refrigerant temperature, and number of cases is shown below.

Fpre={(K1+K2×T)+(K3+K4×T)×P}×(K5×N+K6) (Formula 1)
Here, K1-K6 are constants.
When 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 for predicting the remaining hydrogen filling time will be described.
After a certain period of time has passed since hydrogen filling, the current hydrogen flow rate (Fpv) is compared with the controlled hydrogen flow rate (Fsp). In the period when Fpv is greater than Fsp, the remaining filling time (trem) is obtained by subtracting the current value of the hydrogen filling amount (Qpv) from the rated hydrogen filling amount (Qpre) and dividing it by the current value of the hydrogen flow rate (Fpv). provisionally required by This makes it possible to prepare for the completion of filling. Note that if the hydrogen flow rate (Fpv) falls below the controlled hydrogen flow rate (Fsp), the state will be different from the above premise, so correction is necessary.
That is, when Fpv is smaller than Fsp, trem can be obtained more accurately by calculating t2 using Equation 2 described later and subtracting the data collection interval (tint) from t2.
Regarding t2, the relationship between the refrigerant temperature, charging pressure, and t2 is as shown in FIG.

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

FIG. 10 shows the results when hydrogen filling was performed 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 generally completed at the rated hydrogen filling amount, and that the remaining filling time also agreed well with actual measurements.

1 Container 1 Hydrogen Cylinder 1A Hydrogen Supply Line 2 Manual Valve 3 Pressure Regulating Valve 4 Electromagnetic Switching Valve 5 Hydrogen Flow Meter 6 Electromagnetic Switching Valve 7 Pressure Transmitter 8 Thermometer 9 Cooler 10 Refrigerant Flow Meter 11 Fuel Case 12 Hydrogen Storage Alloy Container 13 Refrigerant channel 100 Hydrogen filling device 110 Control unit

Claims (10)

When one or more hydrogen storage alloy containers are filled 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 hydrogen filling. It is a hydrogen filling method that determines the timing,
The time when hydrogen filling is completed indicates the remaining time until hydrogen filling is completed,
Calculate the difference between the hydrogen filling amount at the completion of filling in the hydrogen storage alloy container and the current hydrogen filling amount, divide this difference by the current hydrogen flow rate, and calculate the remaining time until hydrogen filling is completed. have a procedure,
The hydrogen filling method , wherein the calculation procedure is performed when the current hydrogen flow rate is equal to or higher than the control hydrogen flow rate . 2. The hydrogen filling method according to claim 1 , 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. When one or more hydrogen storage alloy containers are filled 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 hydrogen filling. It is a hydrogen filling method that determines the timing,
The time when hydrogen filling is completed indicates the remaining time until hydrogen filling is completed,
When the current hydrogen flow rate is less than the control hydrogen flow rate, the hydrogen filling completion point is determined by the predetermined physical quantity, and the difference between the hydrogen filling completion point and the integrated value of the data collection interval for acquiring the hydrogen flow rate data is used to determine the hydrogen flow rate. A hydrogen filling method that calculates the remaining time until filling is completed. 4. The hydrogen filling method according to any one of claims 1 to 3 , wherein the timing at which hydrogen filling is completed indicates the time at which hydrogen filling is completed. 5. The hydrogen filling method according to claim 4 , wherein a specified hydrogen flow rate at which filling is completed is determined in advance from the predetermined physical quantity, and hydrogen filling is determined to be completed when the current hydrogen flow rate becomes equal to or less than the specified hydrogen flow rate. The predetermined physical quantity is one or more of the filling pressure of the hydrogen - absorbing alloy container, the temperature of the cooling medium supplied to the hydrogen-absorbing alloy container, and the number of the hydrogen-absorbing alloy containers. Hydrogen filling method. a flow meter for measuring 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 that measures the hydrogen filling pressure in the hydrogen storage alloy,
the flow rate measuring device, the temperature measuring device, and a control unit that receives the measurement result of the pressure gauge and determines when the target hydrogen-absorbing alloy container is filled with hydrogen ;
When the current hydrogen flow rate is equal to or higher than the control hydrogen flow rate, the control unit obtains the difference between the hydrogen filling amount at the completion of filling in the hydrogen storage alloy container and the current hydrogen filling amount, and calculates the difference as the current hydrogen filling amount. A hydrogen filling completion timing determination device that calculates the remaining time until hydrogen filling is completed by dividing by the flow rate . a flow meter for measuring 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 that measures the hydrogen filling pressure in the hydrogen storage alloy,
the flow rate measuring device, the temperature measuring device, and a control unit that receives the measurement result of the pressure gauge and determines when the target hydrogen-absorbing alloy container is filled with hydrogen;
When the current hydrogen flow rate is less than the control hydrogen flow rate, the control unit determines the remaining time until hydrogen filling is completed by the difference between the time when hydrogen filling is completed and the integrated value of the data collection interval for acquiring hydrogen flow rate data. Hydrogen filling completion timing determination device for calculation. 9. The hydrogen filling completion timing determination device according to claim 7 , further comprising a flow control valve for setting the hydrogen flow rate to a predetermined controlled hydrogen flow rate. 10. The hydrogen filling completion timing determination device according to claim 9 , wherein the control unit calculates a hydrogen filling completion time or a hydrogen filling completion remaining time.

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