JP6454315B2 - Hydrogen filling method, hydrogen filling system, and control program - Google Patents

Description

  The present invention relates to a hydrogen filling method, a hydrogen filling system, and a control program.

  In general, a hydrogen filling system (so-called hydrogen station) is known in which high-pressure hydrogen gas is filled in an on-vehicle tank of a fuel cell vehicle (FCV) (see, for example, Patent Document 1).

  The hydrogen filling system is provided with a plurality of pressure accumulators. Each pressure accumulator stores hydrogen in a state where pressure is accumulated. In the hydrogen filling system, the on-vehicle tank is filled with hydrogen supplied from the accumulator by the pressure difference between the accumulator and the on-vehicle tank of the FCV.

  Further, in the hydrogen filling system, for example, a pressurization rate (hereinafter referred to as “ideal filling pressure”) determined in advance by a filling protocol such as “SAE J2601”, “JPEC-S0003 (2012)”, “JPEC-S0003 (2014)”, etc. )), It is agreed to fill the on-board tank with hydrogen.

  For this reason, in the hydrogen filling system, supply of hydrogen is performed so that the filling pressure of hydrogen filling the on-vehicle tank is within the ideal filling pressure and its allowable range determined in advance by the filling protocol from the start of filling to the end of filling. Hydrogen is supplied from the pressure accumulator to the vehicle-mounted tank while controlling the flow rate with a control valve provided in the pipe. In addition, when the filling pressure of the hydrogen filled in the vehicle-mounted tank deviates continuously from the allowable range for a predetermined time, the filling of hydrogen is stopped.

  In addition, in the hydrogen filling system, as the hydrogen is supplied from the accumulator to the on-vehicle tank, the differential pressure between the accumulator and the on-vehicle tank gradually decreases. The speed decreases and the filling pressure of hydrogen filling the on-vehicle tank approaches the lower limit of the allowable range.

  Therefore, the hydrogen filling system is provided with a pressure accumulator switching step for switching the pressure accumulator when the filling pressure of hydrogen filling the on-vehicle tank reaches the lower limit of the allowable range. Specifically, in this accumulator switching step, a certain switching period from the start of switching of the accumulator to the end of switching is determined.

  Here, as shown in the graph of FIG. 3, the relationship between the charging time and the charging pressure of hydrogen supplied from the pressure accumulator a before switching and the pressure accumulator b after switching across the switching period T of the pressure accumulator switching step. Will be described. FIG. 3 is a graph showing the relationship between the hydrogen filling time and the filling pressure by the conventional hydrogen filling method. In the graph shown in FIG. 3, the hydrogen filling pressure is indicated by a “solid line”, the ideal filling pressure is indicated by a “dashed line”, and the allowable range (upper limit: +7.0 MPa, lower limit: −2.0 MPa) is indicated by a “broken line”. Shall.

  As shown in the graph of FIG. 3, in the conventional hydrogen filling method, when the filling pressure of hydrogen supplied from the pressure accumulator a before switching reaches the lower limit of the allowable range, the switching of the pressure accumulator switching step is started. An operation for stopping the supply of hydrogen from the pressure accumulator a before switching is started. Thereby, the supply of hydrogen from the pressure accumulator a before switching is stopped within the switching period T of the pressure accumulator switching step. Then, after the switching of the pressure accumulator switching step, supply of hydrogen from the pressure accumulator b after switching is started.

Japanese Patent No. 5746962

  By the way, the filling pressure of hydrogen supplied from the pressure accumulator b after switching is generally delayed compared to the ideal filling pressure immediately after the supply of hydrogen is started. This is because there is a slight time lag before the pressure in the supply pipe rises, which is below the lower limit of the allowable range.

  For this reason, in the conventional hydrogen filling method, it is necessary to quickly increase the hydrogen filling pressure in order to bring the filling pressure of hydrogen supplied from the accumulator b after switching close to the ideal filling pressure. However, adjustment to bring the hydrogen filling pressure close to the ideal filling pressure in a short time has a concern of rapid filling, and is a problem in following the filling protocol described above.

  Further, in recent years, as the filling pressure of hydrogen filling the vehicle-mounted tank increases, it is necessary to increase the pressure resistance of the supply pipe, and the inner diameter of the supply pipe increases as the thickness of the supply pipe increases. Thereby, the pressure loss of hydrogen flowing in the supply pipe is increased.

  For this reason, in spite of the fact that there is a differential pressure between the accumulator and the on-vehicle tank, the increase in the pressure loss of the supply pipe described above reduces the hydrogen filling rate, and the accumulator switching process is more than expected. There is a possibility of starting at an early timing. In this case, the pressure accumulator must be switched before the hydrogen supplied from the accumulator is sufficiently filled with the vehicle tank. In addition, when the number of on-vehicle tanks that can be filled with one pressure accumulating container is lower than expected, a larger pressure accumulating container or more accumulators may be required.

  The present invention has been proposed in view of such a conventional situation. The filling pressure of hydrogen filled in the container can be made close to the ideal filling pressure, and the hydrogen supplied from the pressure accumulator can be reduced. It is an object of the present invention to provide a hydrogen filling method, a hydrogen filling system, and a control program capable of efficiently filling a container quantitatively.

In order to achieve the above object, the present invention provides the following means.
[1] The container is filled with hydrogen supplied from the pressure accumulator by a differential pressure between a pressure accumulator that stores hydrogen in a pressure-accumulated state and a container to be filled with hydrogen. The accumulator is switched from the accumulator to the container while switching the accumulator so that the hydrogen filling pressure is within the ideal filling pressure determined by the filling protocol and its allowable range from the start of filling to the end of filling. A hydrogen filling method of supplying hydrogen of
An accumulator switching step of switching the accumulator when the filling pressure of hydrogen charged in the container reaches the lower limit of the allowable range;
In the constant switching period from the start of switching of the pressure accumulator to the end of switching in the pressure accumulator switching step, after continuing the supply of hydrogen from the pressure accumulator before switching to the container, the pressure accumulator before switching from the container The hydrogen filling method is characterized in that the supply of hydrogen to the container is stopped, and after the switching is completed, the supply of hydrogen from the pressure accumulator after switching to the container is started.
[2] In the switching period, after a certain period of time has elapsed from the start of switching, filling within the switching period is started by starting an operation of stopping the supply of hydrogen from the pre-switching pressure accumulator to the container. The hydrogen filling method according to [1], wherein the pressure exceeds a lower limit of the allowable range.
[3] In the switching period, the operation for stopping the supply of hydrogen from the pressure accumulator before the switching to the container is started from the start of the switching, and by extending the time required for the operation, The hydrogen filling method according to [1], wherein the filling pressure exceeds the lower limit of the allowable range.
[4] The container is filled with hydrogen supplied from the pressure accumulator by a differential pressure between a pressure accumulator that stores hydrogen in a pressure-accumulated state and a container to be filled with hydrogen. The accumulator is switched from the accumulator to the container while switching the accumulator so that the hydrogen filling pressure is within the ideal filling pressure determined by the filling protocol and its allowable range from the start of filling to the end of filling. A hydrogen filling system for supplying hydrogen,
A control unit that controls switching of the pressure accumulator when a filling pressure of hydrogen filling the container reaches a lower limit of the allowable range;
The control unit continues the supply of hydrogen from the pressure accumulator before switching to the container in a certain switching period from the start of switching of the pressure accumulator to the end of switching, and then from the pressure accumulator before switching to the container. The hydrogen filling system is characterized in that after the switching is stopped, the supply of hydrogen from the pressure accumulator after switching to the container is started.
[5] The container is filled with hydrogen supplied from the pressure accumulator by a differential pressure between a pressure accumulator that stores hydrogen in a pressure-accumulated state and a container to be filled with hydrogen. The accumulator is switched from the accumulator to the container while switching the accumulator so that the hydrogen filling pressure is within the ideal filling pressure determined by the filling protocol and its allowable range from the start of filling to the end of filling. A control program executed in a hydrogen filling system for supplying hydrogen of
An accumulator switching step of switching the accumulator when the filling pressure of hydrogen filled in the container reaches the lower limit of the allowable range;
In a certain switching period from the start of switching of the pressure accumulator to the end of switching in the pressure accumulator switching step, after continuing the supply of hydrogen from the pressure accumulator before switching to the container, from the pressure accumulator before switching to the container A control program for executing a control for stopping the supply of hydrogen to the container, and starting the supply of hydrogen from the pressure accumulator after switching to the container after the switching is completed.

  As described above, according to the present invention, the filling pressure of hydrogen filled in the container can be made close to the ideal filling pressure, and the container is filled with hydrogen supplied from the pressure accumulator efficiently and quantitatively. It is possible to provide a hydrogen filling method, a hydrogen filling system, and a control program that make it possible.

It is a systematic diagram which shows the structure of the hydrogen filling system which concerns on one Embodiment of this invention. It is a graph which shows the relationship between the filling time and filling pressure of hydrogen by the hydrogen filling method of this invention. It is a graph which shows the relationship between the filling time and filling pressure of hydrogen by the conventional hydrogen filling method.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As one embodiment of the present invention, for example, a hydrogen filling system 1 shown in FIG. 1 will be described. FIG. 1 is a system diagram showing the configuration of the hydrogen filling system 1.

  The hydrogen filling system 1 of this embodiment is a so-called hydrogen station that fills a vehicle tank (not shown) of a fuel cell vehicle (FCV) 3 as a container to be filled with hydrogen, for example. The invention is applied.

  Note that the FCV 3 travels by driving a motor with electric power obtained by an electrochemical reaction between hydrogen and oxygen. Further, the FCV 3 is provided with a shut-off valve (not shown) that is opened during hydrogen filling and closed after the filling.

  As shown in FIG. 1, the hydrogen filling system 1 of the present embodiment includes a plurality of pressure accumulators 20-1 to 20 -N (N represents an integer of 2 or more) and a plurality of branch pipes 11-1 to 11-11. -N, a plurality of pressure gauges 21-1 to 21-N, a plurality of shut-off valves 22-1 to 22-N, a supply pipe 12, a control valve 23, a shut-off valve 24, a pressure gauge 26, A coupler 28 and a control device 10 are schematically provided.

  In the following description, a plurality of pressure accumulators 20-1 to 20-N, a plurality of branch pipes 11-1 to 11-N, a plurality of pressure gauges 21-1 to 21-N, and a plurality of shut-off valves 22-1 Unless otherwise distinguished, ˜22-N shall be handled collectively as the pressure accumulator 20, the branch pipe 11, the pressure gauge 21, and the shutoff valve 22, respectively.

  The pressure accumulators 20-1 to 20-N are containers that store high-pressure hydrogen compressed by a compressor (not shown) in a state where pressure is accumulated. In general, a large-sized manganese ore seamless cylinder, a curdle, a composite container, or the like is used for the pressure accumulators 20-1 to 20-N. In addition, the pressure accumulator 20 should just be what can accumulate | store high-pressure hydrogen, About the material, a shape, etc., it does not specifically limit.

  The branch pipes 11-1 to 11-N are pipes connected to the respective pressure accumulators 11-1 to 11-N. The branch pipes 11-1 to 11-N are preferably made of metal because the pressure of hydrogen flowing in the pipe is high, but the material is not particularly limited. In general, stainless steel pipes are used for the branch pipes 11-1 to 11-N. Moreover, the outer diameter of the branch pipes 11-1 to 11-N is, for example, 6.35 to 14.7 mm.

  The pressure gauges 21-1 to 21-N are provided between the pressure accumulators 20-1 to 20-N and the shutoff valves 22-1 to 22-N of the branch pipes 11-1 to 11-N, respectively. The pressures of hydrogen in the vessels 20-1 to 20-N are respectively measured. The pressure gauges 21-1 to 21 -N are electrically connected to the control device 10 and transmit measured values to the control device 10.

  The shut-off valves 22-1 to 22-N are open / close valves that are provided in the branch pipes 11-1 to 11-N, respectively, and switch supply or shut-off of hydrogen from the pressure accumulators 11-1 to 11-N. Each shut-off valve 22-1 to 22-N is electrically connected to the control device 10 and is opened and closed in accordance with the control of the control device 10.

  The supply pipe 12 is a pipe connected to the downstream side of each branch pipe 11-1 to 11-N. That is, the branch pipes 11-1 to 11 -N are coupled to each downstream side and connected to one end of the supply pipe 12. The supply pipe 12 is preferably made of metal because the pressure of hydrogen flowing in the pipe is high, but the material is not particularly limited. Generally, a stainless steel pipe is used for the supply pipe 12. The outer diameter of the supply pipe 12 is, for example, an outer diameter of 6.35 to 14.7 mm.

  The control valve 23 is a needle valve that is provided in the supply pipe 12 and adjusts the flow rate of hydrogen by adjusting the opening thereof. The control valve 23 is electrically connected to the control device 10, and the opening degree is adjusted according to the control of the control device 10.

  The shutoff valve 24 is an on-off valve that is provided on the downstream side of the control valve 23 of the supply pipe 12 and switches between supply and shutoff of hydrogen. The shut-off valve 24 is electrically connected to the control device 10 and is opened and closed according to the control of the control device 10.

  The pressure gauge 26 is provided between the shutoff valve 24 of the supply pipe 12 and the coupler 28, and measures the pressure of hydrogen flowing through the supply pipe 12. The pressure gauge 26 is electrically connected to the control device 10 and transmits a measurement value to the control device 10. The pressure value of the hydrogen gas measured by the pressure gauge 26 substantially matches the pressure in the on-vehicle tank of the FCV3. For the pressure gauge 26, for example, a pressure transmitter is used. However, the pressure gauge 26 is not limited to this as long as the pressure can be measured.

  The coupler 28 is a coupling member for connecting the supply pipe 12 and the FCV 3. By connecting the supply pipe 12 and the FCV 3 by the coupler 28, hydrogen can be charged from the accumulator 20 to the in-vehicle tank of the FCV 3. Further, after the filling is completed, the coupler 28 is removed from the FCV 3.

  The control device 10 includes an auxiliary storage such as a CPU (Central Processing Unit) connected via a bus, a memory (main storage device) including a ROM (Read Only Memory) and a RAM (Random Access Memory), and an HDD (Hard Disk Drive). A computer provided with a device and the like. In the control device 10, the CPU expands and executes a control program stored in the ROM or HDD on the RAM, and controls each unit according to the processing result.

  All or some of the functions of the control device 10 may be realized by using hardware such as an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA).

  The control program may be recorded on a computer-readable recording medium. Examples of the recording medium include magnetic recording media such as HDD (Hard Disk Drive), optical recording media such as CD (Compact Disc), DVD (Digital Versatile Disc), and MO (Magneto optical) disc, SSD (Solid State Drive). And a semiconductor memory such as a USB (Universal Serial Bus) memory. Further, the control program may be transmitted / received via a telecommunication line.

  The control device 10 receives the pressure measurement values transmitted from the pressure gauges 21-1 to 21 -N and the pressure gauge 26. The control device 10 refers to the measured value of the received pressure, controls to open / close the shut-off valves 22-1 to 22-N and the shut-off valve 24, and controls to open / close the control valve 23 and adjust the opening thereof. I do.

  In the hydrogen filling system 1 having the above-described configuration, first, after the supply pipe 12 and the FCV 3 are connected by the coupler 28, the shutoff valve of the FCV 3 is opened. Next, the shutoff valve 22, the control valve 23, and the shutoff valve 24 corresponding to the pressure accumulator 20 to be used are opened. When the shut-off valve 22, the control valve 23, and the shut-off valve 24 are opened, the hydrogen stored in the pressure accumulator 20 and the branch pipe 11 and the pressure difference between the pressure accumulator 20 and the in-vehicle tank of the FCV 3 are opened. It is supplied to the FCV 3 through the supply pipe 12 and filled in the on-vehicle tank (referred to as differential pressure filling).

  At this time, the adjustment provided in the supply pipe 12 so that the filling pressure of hydrogen filling the in-vehicle tank is located within the ideal filling pressure predetermined by the filling protocol and its allowable range from the start of filling to the end of filling. While the flow rate is controlled by the valve 23, hydrogen is supplied from the pressure accumulator 20 to the vehicle-mounted tank. In addition, when the filling pressure of the hydrogen filled in the vehicle-mounted tank is out of the allowable range continuously for a predetermined time, the filling of hydrogen is stopped.

  Moreover, in the hydrogen filling system 1, since the differential pressure between the pressure accumulator 20 and the vehicle-mounted tank gradually decreases as hydrogen is supplied from the pressure accumulator 20 to the vehicle-mounted tank, the filling amount per unit time As a result, the charging speed of hydrogen filling the in-vehicle tank approaches the lower limit of the allowable range. That is, the pressure difference between the pressure accumulator 20 and the vehicle-mounted tank is reduced, and it becomes difficult to follow the ideal filling pressure even when the control valve 23 is fully opened.

  Therefore, in the hydrogen filling system 1 of the present embodiment, when the filling pressure of hydrogen filling the on-vehicle tank reaches the lower limit of the allowable range, the control device 10 that is the control unit of the present invention performs the hydrogenation of the present invention. Control for switching the pressure accumulator 20 is performed in accordance with a control program for executing the filling method.

  Specifically, a hydrogen filling method according to an embodiment of the present invention will be described with reference to a graph shown in FIG. FIG. 2 is a graph showing the relationship between hydrogen filling time and filling pressure by the hydrogen filling method of the present invention. In the graph shown in FIG. 2, similarly to the graph shown in FIG. 2, the hydrogen filling pressure is “solid line”, the ideal filling pressure is “one-dot chain line”, and its allowable range (upper limit: +7.0 MPa, lower limit: − 2.0 MPa) is indicated by a “broken line”.

  In the hydrogen filling method of the present embodiment, the pressure accumulator switching step (the accumulator switching step of the control program) is performed to switch the accumulator 20 when the filling pressure of the hydrogen filled in the vehicle tank reaches the lower limit of the allowable range. ) Is provided. Specifically, in this accumulator switching step, a fixed switching period T from the start of switching of the accumulator 20 to the end of switching is determined. In the present embodiment, the switching time T is about 3 to 10 seconds.

  The graph shown in FIG. 2 is similar to the graph shown in FIG. 3 described above, and the filling time of hydrogen supplied from the pressure accumulator a before switching and the pressure accumulator b after switching across the switching period T of the pressure accumulator switching step, The relationship with the filling pressure is shown. Further, in the graph shown in FIG. 2, a graph obtained by the conventional hydrogen filling method shown in FIG. 3 is also shown by a dotted line.

  As shown in the graph of FIG. 2, in the hydrogen filling method of the present embodiment, the pressure accumulator switching process starts when the hydrogen filling pressure supplied from the pressure accumulator a before switching reaches the lower limit of the allowable range. Is done. In the present embodiment, when the difference between the ideal filling pressure and the measured value (gauge pressure) of the pressure gauge 26 reaches a predetermined specified value (-2.0 MPaG in the present embodiment), the pressure accumulator switching step is performed. It starts automatically.

  In the hydrogen filling method of the present embodiment, after continuing the supply of hydrogen from the pressure accumulator a before switching to the vehicle tank in a certain switching period T from the switching start of the pressure accumulator a to the end of switching in the pressure accumulator switching step. Then, the supply of hydrogen from the pressure accumulator a before switching to the vehicle tank is stopped, and after the switching ends, the supply of hydrogen from the pressure accumulator b after switching to the vehicle tank is started.

  Specifically, in this switching period T, after a certain time has elapsed from the start of switching, an operation for stopping the supply of hydrogen from the pre-switching accumulator a to the vehicle tank is started. That is, after a certain time has elapsed from the start of switching, an operation for closing the shutoff valve 22 corresponding to the pressure accumulator a before switching is started.

  In the conventional hydrogen filling method shown in FIG. 3, the operation for stopping the supply of hydrogen from the pressure accumulator a before switching is started from the start of switching in the pressure accumulator switching step. On the other hand, in the hydrogen filling method of the present invention shown in FIG. 2, an operation to stop the supply of hydrogen from the pressure accumulator a before switching is started after a predetermined time has elapsed since the switching start of the pressure accumulator switching step. To do.

  In this embodiment, the shutoff valve 22 corresponding to the pressure accumulator a before switching is closed (fully closed) immediately before the end of switching in the pressure accumulator switching step (2.0 seconds before in this embodiment). Then, an operation for closing the shutoff valve 22 was started.

  Thereby, in the hydrogen filling method of this embodiment, the supply of hydrogen from the pressure accumulator a before switching is stopped within the switching period T of the pressure accumulator switching step. At this time, the filling pressure within the switching period T exceeds the lower limit of the allowable range. Then, after the switching of the pressure accumulator switching step, supply of hydrogen from the pressure accumulator b after switching is started. That is, the operation of opening the shutoff valve 22 corresponding to the switched pressure accumulator b is started.

  Thereby, when the supply of hydrogen from the pressure accumulator b after switching to the in-vehicle tank is started, even if a time lag occurs in the increase in the charging pressure of hydrogen supplied from the pressure accumulator b after switching, the conventional Thus, it is possible to prevent the filling pressure of hydrogen filling the vehicle-mounted tank from falling below the lower limit of the allowable range.

  On the other hand, in the hydrogen filling method of the present invention, in the switching period T, the operation of stopping the supply of hydrogen from the pre-switching pressure accumulator a to the vehicle-mounted tank is started from the start of switching, and the time required for the operation is extended. The filling pressure within the switching period T may be raised above the lower limit of the allowable range.

  That is, the operation of stopping the supply of hydrogen from the pressure accumulator a before switching is started from the switching start of the pressure accumulator switching step, but the shutoff valve 22 corresponding to the pressure accumulator a before switching is closed (fully closed). Delay the time it takes to do.

  Thereby, the supply of hydrogen from the pressure accumulator a before switching is stopped within the switching period T of the pressure accumulator switching step, but the filling pressure within the switching period T exceeds the lower limit of the allowable range. . Then, after the switching of the pressure accumulator switching step, supply of hydrogen from the pressure accumulator b after switching is started. That is, the operation of opening the shutoff valve 22 corresponding to the switched pressure accumulator b is started.

  In this case as well, even when there is a time lag in the increase in the charging pressure of hydrogen supplied from the pressure accumulator b after switching when the supply of hydrogen from the pressure accumulator b after switching to the vehicle tank is started, In addition, it is possible to prevent the filling pressure of hydrogen filling the vehicle-mounted tank from falling below the lower limit of the allowable range.

  Therefore, in the hydrogen filling method of the present embodiment, the hydrogen filling pressure supplied from the pressure accumulator b after switching can be brought close to the ideal filling pressure, and by giving a margin to the lower limit of the allowable pressure, It is possible to prevent rapid filling.

  In the hydrogen filling system 1 of the present embodiment, when the measured value of the pressure gauge 26 reaches a specified pressure (end pressure), the shutoff valve 22 corresponding to the pressure accumulator 20 in use, the control valve 23, and the shutoff The valve 24 is closed. This completes the filling of the FCV3 on-vehicle tank with hydrogen. After filling, the coupler 28 is removed from the FCV 3.

In addition, this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
For example, in the above-described embodiment, the case where hydrogen is charged into the on-board tank of the FCV3 is illustrated as a container to be filled with hydrogen. However, the container is not limited to the on-board tank and may be a container that can be filled with hydrogen. That's fine.

  The fuel gas of FCV3 is not limited to hydrogen as described above, and may be any gas that can extract electric power through an electrochemical reaction, and may include gas other than hydrogen.

  DESCRIPTION OF SYMBOLS 1 ... Hydrogen filling system 3 ... FCV (vehicle tank) 10 ... Control apparatus (control part) 11 (11-1 to 11-N) ... Branch pipe 12 ... Supply piping 20 (20-1 to 20-N) ... Pressure accumulator 21 (21-1 to 21-N) 26 ... Pressure gauge 22 (22-1 to 22-N), 24 ... Shut-off valve 23 ... Control valve 28 ... Coupler

Claims (5)

The container is filled with hydrogen supplied from the pressure accumulator by a differential pressure between a pressure accumulator that stores hydrogen in a pressure-accumulated state and a container to be filled with hydrogen, and hydrogen that is filled in the container. While the accumulator is switched so that the filling pressure of the accumulator is within the ideal filling pressure determined by the filling protocol and its allowable range from the start of filling to the end of filling, the hydrogen pressure from the accumulator to the container is changed. A hydrogen filling method for supplying,
An accumulator switching step of switching the accumulator when the filling pressure of hydrogen charged in the container reaches the lower limit of the allowable range;
In the constant switching period from the start of switching of the pressure accumulator to the end of switching in the pressure accumulator switching step, after continuing the supply of hydrogen from the pressure accumulator before switching to the container, the pressure accumulator before switching from the container The hydrogen filling method is characterized in that the supply of hydrogen to the container is stopped, and after the switching is completed, the supply of hydrogen from the pressure accumulator after switching to the container is started.   In the switching period, after a certain time has elapsed from the start of the switching, by starting an operation to stop the supply of hydrogen from the pressure accumulator before the switching to the container, the filling pressure in the switching period, The hydrogen filling method according to claim 1, wherein the hydrogen filling method exceeds a lower limit of the allowable range.   In the switching period, the operation for stopping the supply of hydrogen from the pressure accumulator before the switching to the container is started from the start of the switching, and the filling time in the switching period is increased by extending the time required for the operation. The hydrogen filling method according to claim 1, which exceeds a lower limit of the allowable range. The container is filled with hydrogen supplied from the pressure accumulator by a differential pressure between a pressure accumulator that stores hydrogen in a pressure-accumulated state and a container to be filled with hydrogen, and hydrogen that is filled in the container. While the accumulator is switched so that the filling pressure of the accumulator is within the ideal filling pressure determined by the filling protocol and its allowable range from the start of filling to the end of filling, the hydrogen pressure from the accumulator to the container is changed. A hydrogen filling system for supplying,
A control unit that controls switching of the pressure accumulator when a filling pressure of hydrogen filling the container reaches a lower limit of the allowable range;
The control unit continues the supply of hydrogen from the pressure accumulator before switching to the container in a certain switching period from the start of switching of the pressure accumulator to the end of switching, and then from the pressure accumulator before switching to the container. The hydrogen filling system is characterized in that after the switching is stopped, the supply of hydrogen from the pressure accumulator after switching to the container is started. The container is filled with hydrogen supplied from the pressure accumulator by a differential pressure between a pressure accumulator that stores hydrogen in a pressure-accumulated state and a container to be filled with hydrogen, and hydrogen that is filled in the container. While the accumulator is switched so that the filling pressure of the accumulator is within the ideal filling pressure determined by the filling protocol and its allowable range from the start of filling to the end of filling, the hydrogen pressure from the accumulator to the container is changed. A control program executed in a hydrogen filling system for supplying,
An accumulator switching step of switching the accumulator when the filling pressure of hydrogen filled in the container reaches the lower limit of the allowable range;
In a certain switching period from the start of switching of the pressure accumulator to the end of switching in the pressure accumulator switching step, after continuing the supply of hydrogen from the pressure accumulator before switching to the container, from the pressure accumulator before switching to the container A control program for executing a control for stopping the supply of hydrogen to the container, and starting the supply of hydrogen from the pressure accumulator after switching to the container after the switching is completed.

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