Hydrogenation machine hydrogenation amount calibration system, calibration method and hydrogenation amount determination method

Abstract

The application belongs to the technical field of gas flow measurement, and discloses a hydrogenation machine hydrogenation quantity calibration system, a calibration method and a hydrogenation quantity determination method. According to the scheme, the liquid surfaces in the cavities of the communicating vessel are kept in the same horizontal plane, and the buoyancy principle is used. A floating body is fixed with a gas storage container and placed in the containing cavity of the communicating vessel. The floating body floats in the containing cavity and can freely rise and fall in the containing cavity. The gas storage container is below the liquid surface in the containing cavity, and a liquid level detection unit is arranged in the test cavity communicating with the containing cavity to detect the liquid level height of the test cavity. According to the difference between the liquid level height of the liquid in the test cavity detected by the liquid level detection unit before and after the hydrogenation machine fills hydrogen into the gas storage container, the liquid surface cross-sectional area of the communicating vessel and the liquid density in the communicating vessel, the first hydrogen quantity filled into the gas storage container by the hydrogenation machine is determined, and the hydrogenation machine is calibrated according to the first hydrogen quantity and the hydrogen quantity measured by the hydrogenation machine, so that the accurate calibration of the correction coefficient of the hydrogen quantity measured by the hydrogenation machine is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas flow measurement, in particular to a hydrogen refueling dispenser hydrogen refueling quantity calibration system, calibration method and hydrogen refueling quantity determination method. BACKGROUND

[0002] With the advancement of vehicle technology and the increasing requirement for emission reduction, the promotion and application of hydrogen fuel cell vehicles, the number of hydrogen refueling stations is increasing, and the number of hydrogen refueling dispensers is also increasing. The hydrogen refueling dispenser is a transaction tool for hydrogen refueling of hydrogen fuel cell vehicles, and the accuracy of its measurement directly affects the fairness of the transaction. Therefore, it is necessary to accurately calibrate the hydrogen refueling quantity of the hydrogen refueling dispenser.

[0003] In the prior art, the hydrogen refueling dispenser is usually calibrated by using the mass method. The mass method is to place a hydrogen storage container on an electronic balance, then fill hydrogen into the hydrogen storage container, and convert the correction coefficient by comparing the measurement data of the electronic balance and the hydrogen refueling dispenser to correct the hydrogen refueling dispenser. The self-weight of the hydrogen storage container is about 300-500 kg, and the mass of the filled hydrogen is generally not more than 15 kg. The mass ratio of the filled hydrogen to the self-weight of the hydrogen storage container is too small, resulting in a large measurement error, and the correction coefficient of the hydrogen refueling dispenser calculated is inaccurate. SUMMARY

[0004] In order to solve the above problems, the present application provides a hydrogen refueling dispenser hydrogen refueling quantity calibration system, calibration method and hydrogen refueling quantity determination method.

[0005] According to the embodiments of the present application, a hydrogen refueling dispenser hydrogen refueling quantity calibration system is disclosed, which comprises a communicating vessel, a gas storage assembly, a liquid level detection unit and a processing unit, wherein the communicating vessel has a communicating accommodation cavity and a test cavity; the gas storage assembly is arranged in the accommodation cavity and comprises a gas storage container and a floating body, the floating body is fixed with the gas storage container, the floating body floats in the accommodation cavity and can freely rise and fall in the accommodation cavity, and the gas storage container is located below the liquid surface in the accommodation cavity; the liquid level detection unit is arranged in the test cavity, and the liquid level detection unit is used to detect the liquid level height of the liquid in the test cavity; the processing unit is used to determine the first hydrogen quantity filled into the gas storage container by the hydrogen refueling dispenser according to the liquid surface cross-sectional area of the communicating vessel, the liquid level height difference detected by the liquid level detection unit and the liquid density in the communicating vessel, and calibrate the hydrogen refueling dispenser according to the first hydrogen quantity and the hydrogen quantity measured by the hydrogen refueling dispenser, wherein the liquid level height difference is the difference value of the liquid level height of the liquid in the test cavity detected by the liquid level detection unit before and after the hydrogen refueling dispenser fills hydrogen into the gas storage container.

[0006] In some embodiments, the accommodating cavity comprises a first cavity portion and a second cavity portion in communication, the second cavity portion is above the first cavity portion, the liquid level of the accommodating cavity is above the first cavity portion, the floating body is at least partially located in the second cavity portion and is capable of freely rising and falling in the second cavity portion, there is a gap between the floating body and the cavity wall of the second cavity portion, the ratio of the cross-sectional area of the gap to the cross-sectional area of the floating body is less than or equal to 1%, and the ratio of the cross-sectional area of the test cavity to the cross-sectional area of the floating body is less than or equal to 1%.

[0007] In some embodiments, the accommodating cavity has a pipeline interface in communication with the outside world, the pipeline interface is connected with the gas storage container through a gas charging pipeline, and the gas charging pipeline is suspended in the accommodating cavity.

[0008] In some embodiments, the cross-section of the floating body is uniform at any height.

[0009] In some embodiments, the liquid level detection unit comprises a signal emitting band and a signal receiving band, the signal emitting band comprises a plurality of emitters arranged at intervals in the height direction, the signal receiving band comprises a plurality of receivers arranged at intervals in the height direction, each receiver and each emitter form a detector group, and the receiver and the emitter in the detector group are located in the same horizontal plane; the receiver in the detector group can receive the signal emitted by the emitter only when the liquid level in the test cavity is lower than the set height of the detector group.

[0010] In some embodiments, each emitter has a physical address, each receiver has a physical address, and the physical addresses of the receiver and the emitter in the detector group are the same.

[0011] In some embodiments, the emitter is an infrared signal emitter, and the receiver is an infrared signal receiver.

[0012] In some embodiments, the cavity wall of the test cavity has a light-absorbing area and a light-transmitting area, the signal receiving band is arranged in the light-transmitting area, the area outside the signal receiving band is the light-absorbing area, and the light-absorbing area is covered with a light-absorbing material.

[0013] According to the embodiment of the present application, a hydrogen filling amount calibration method for the calibration system is also disclosed. The calibration method comprises: recording a first liquid level detected by the liquid level detection unit before hydrogen is filled into the gas storage container; filling hydrogen into the gas storage container by the hydrogen filling machine, which can measure the amount of hydrogen filled into the gas storage container; stopping filling hydrogen into the gas storage container when a set filling end condition is reached, and recording a second liquid level detected by the liquid level detection unit; determining a first hydrogen amount filled into the gas storage container according to the cross-sectional area of the liquid surface of the communicating vessel, the liquid level difference between the second liquid level and the first liquid level, and the liquid density in the communicating vessel; and determining a correction coefficient of the hydrogen amount measured by the hydrogen filling machine according to the determined first hydrogen amount and the hydrogen amount measured by the hydrogen filling machine.

[0014] In some embodiments, the determination of the first hydrogen amount filled into the gas storage container according to the cross-sectional area of the liquid surface of the communicating vessel, the liquid level difference between the second liquid level and the first liquid level, and the liquid density in the communicating vessel comprises: obtaining the product of the cross-sectional area of the liquid surface of the communicating vessel, the liquid level difference between the second liquid level and the first liquid level, and the liquid density in the communicating vessel as the first hydrogen amount filled into the gas storage container. The determination of the correction coefficient of the hydrogen amount measured by the hydrogen filling machine according to the determined first hydrogen amount and the hydrogen amount measured by the hydrogen filling machine comprises: obtaining the quotient of the determined first hydrogen amount and the hydrogen amount measured by the hydrogen filling machine as the correction coefficient of the hydrogen amount measured by the hydrogen filling machine.

[0015] In some embodiments, the cross-sectional area of the liquid surface of the communicating vessel is obtained based on the sum of the cross-sectional area of the containing cavity and the cross-sectional area of the liquid surface of the test cavity, and then subtracted from the cross-sectional area of the float, wherein the cross-sectional area of the containing cavity is the cross-sectional area of the containing cavity for containing the part of the float.

[0016] In some embodiments, the recording of the first liquid level detected by the liquid level detection unit, or the recording of the second liquid level detected by the liquid level detection unit, comprises: sending the physical address of the transmitter of the liquid level detection unit as signal content to the transmitter; sending the signal content to the receiver of the liquid level detection unit through the transmitter; a receiver and a transmitter located in the same horizontal plane form a detector group, and the physical addresses of the receiver and the transmitter in the detector group are the same; when the receiver signal of the receiver is obtained, analyzing the receiver signal, if the analyzed signal content is the same as the physical address of the receiver, regarding the receiver signal of the receiver as a correct signal; otherwise, discarding the receiver signal; and determining the liquid level based on the correct signal.

[0017] In some embodiments, the hydrogen filling machine is connected to the gas storage container through a filling pipeline, the gas storage container comprises a container body for storing hydrogen and a first valve arranged on the container body for controlling the opening and closing of a filling flow path of the container body. Before recording the first liquid level height detected by the liquid level detection unit, the method further comprises: controlling the first valve to be closed to block the filling flow path of the container body; and filling hydrogen into the filling pipeline to make the gas pressure in the filling pipeline be a first pressure. Before recording the second liquid level height detected by the liquid level detection unit, the method further comprises: filling hydrogen into the filling pipeline to make the gas pressure in the filling pipeline be the first pressure.

[0018] In some embodiments, after the hydrogen is filled into the gas storage container by the hydrogen filling machine, the method further comprises: obtaining the amount of hydrogen measured by the hydrogen filling machine and the pressure value in the gas storage container; if the amount of hydrogen measured by the hydrogen filling machine is below a hydrogen amount threshold value and the pressure value in the gas storage container is below a pressure threshold value, continuing to fill hydrogen into the gas storage container; otherwise, determining that a set filling end condition is reached; wherein the pressure threshold value is less than an allowable pressure value of the gas storage container.

[0019] According to the embodiments of the present application, a hydrogen filling amount determination method for a hydrogen filling machine is also disclosed, which comprises: obtaining a correction coefficient of the amount of hydrogen measured by the hydrogen filling machine by using the calibration method described above; and determining the actual hydrogen filling amount based on the correction coefficient and the amount of hydrogen measured by the hydrogen filling machine at the end of hydrogen filling.

[0020] The technical solutions provided by the embodiments of the present application have at least the following beneficial effects:

[0021] The scheme disclosed by the present application utilizes the principle that the liquid surfaces in the chambers of the communicating vessel are always kept horizontal and the principle of buoyancy, and the floating body is fixed together with the gas storage container and placed in the containing chamber of the communicating vessel, the floating body floats in the containing chamber and can freely rise and fall in the containing chamber, the gas storage container is located below the liquid surface in the containing chamber, and the liquid level detection unit is arranged in the test chamber communicated with the containing chamber to detect the liquid level height of the liquid in the test chamber. According to the difference between the liquid level height of the liquid in the test chamber detected by the liquid level detection unit before and after the hydrogen filling machine fills hydrogen into the gas storage container, the liquid surface cross-sectional area of the communicating vessel and the density of the liquid in the communicating vessel, the first amount of hydrogen filled into the gas storage container by the hydrogen filling machine is determined, and the hydrogen filling machine is calibrated according to the first amount of hydrogen and the amount of hydrogen measured by the hydrogen filling machine, so that the correction coefficient of the amount of hydrogen measured by the hydrogen filling machine is accurately calibrated.

[0022] It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the present application. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the principles of this application.

[0024] Figure 1 A schematic diagram of the structure of a hydrogen refueling machine hydrogen addition calibration system according to an embodiment of this application is shown.

[0025] Figure 2 A schematic diagram of light passing through a cavity is shown. In the diagram, (a) is a schematic diagram of light traveling in a straight line, and (b) is a schematic diagram of light being refracted.

[0026] Figure 3 A schematic diagram showing the smooth surface passing through the cavity is shown.

[0027] Figure 4 A schematic diagram of the signals received before and after a liquid level change according to an embodiment of this application is shown.

[0028] Figure 5 A schematic diagram of a liquid level detection process according to an embodiment of this application is shown.

[0029] Figure 6 A schematic diagram of an electronic control system according to an embodiment of this application is shown.

[0030] Figure 7 A flowchart of a hydrogen refueling machine calibration method according to an embodiment of this application is shown.

[0031] Figure 8 A schematic diagram illustrating the calculation of hydrogen mass according to an embodiment of this application is shown.

[0032] Figure 9 A detailed flowchart illustrating an embodiment of this application for detecting liquid level height is shown.

[0033] Figure 10 A flowchart of another calibration method of this application is shown.

[0034] Figure 11 An overall logic diagram of a calibration method according to another embodiment of this application is shown.

[0035] Figure 12 It shows Figure 11 The flowchart shows the detailed steps for preparing the state.

[0036] Figure 13 It shows Figure 11 The flowchart shows the detailed steps of the calibration process.

[0037] Figure 14 It shows Figure 11The flowchart shows the detailed steps for handling the end state.

[0038] Figure 15 It shows Figure 11 The flowchart shows the detailed data processing steps.

[0039] The annotations in the attached figures are explained as follows:

[0040] 1. Communicating vessel; 11. Receiving cavity; 111. First cavity section; 112. Second cavity section; 113. Pipeline interface; 12. Test cavity; 13. Connecting cavity; 21. Gas storage container; 211. Container body; 212. First valve; 22. Floating body; 23. Gas filling pipeline; 3. Liquid level detection unit; 31. Signal transmitting band; 311. Transmitter; 32. Signal receiving band; 321. Receiver; 4. Control unit; 5. Cloud platform; 61. Opening adjustment valve; 62. First connecting pipeline; 63. Second connecting pipeline; 7. Hydrogen dispenser; 8. Gas supply source; 9. Pressure sensor. Detailed Implementation

[0041] To make the objectives, implementation methods, and advantages of this application clearer, exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these exemplary embodiments are provided to make the description of this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. It should be noted that the brief descriptions of terminology in this application are merely for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0042] In the description of this application, it should be understood that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0043] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more features.

[0045] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] Figure 1 A schematic diagram of the structure of a hydrogen refueling machine hydrogen addition calibration system according to an embodiment of this application is shown.

[0048] like Figure 1 As shown, the hydrogen addition calibration system of the hydrogen refueling machine in this application embodiment includes a communicating vessel 1, which has a receiving cavity 11 and a test cavity 12 connected together.

[0049] The bottoms of the receiving cavity 11 and the test cavity 12 are connected by a connecting cavity 13, so that the receiving cavity 11 and the test cavity 12 are connected.

[0050] Understandably, the receiving cavity 11, the testing cavity 12, and the connecting cavity 13 are all filled with liquid, and the liquid levels in the receiving cavity 11 and the testing cavity 12 are the same.

[0051] In some embodiments, the receiving cavity 11, the test cavity 12, and the connecting cavity 13 are filled with a transparent liquid to facilitate observation of the internal condition of the communicating vessel 1. This transparent liquid can be water.

[0052] In some embodiments, such as Figure 1 As shown, the receiving cavity 11 includes a first cavity portion 111 and a second cavity portion 112 that are connected, with the second cavity portion 112 located above the first cavity portion 111. The liquid level in the receiving cavity 11 is above the first cavity portion 111, meaning that the second cavity portion 112 is also filled with liquid.

[0053] The hydrogen dispensing volume calibration system also includes a gas storage assembly, which comprises a gas storage container 21 and a float 22, with the float 22 fixed to the gas storage container 21. The gas storage assembly is disposed in a receiving cavity 11, wherein the gas storage container 21 is located below the liquid surface in the receiving cavity 11, and the float 22 floats in the receiving cavity 11, and the float 22 can freely rise and fall within the receiving cavity 11.

[0054] When hydrogen is introduced into the gas storage container 21, the total mass of the gas storage container 21 increases, and the gas storage container 21 can pull the float 22 downward in the receiving cavity 11. When the gas storage container 21 pulls the float 22 downward, the liquid levels in the receiving cavity 11 and the test cavity 12 rise simultaneously. According to the principle of communicating vessels, the liquid levels in the receiving cavity 11 and the test cavity 12 become level.

[0055] The gas storage container 21 includes a container body 211 and a first valve 212. The container body 211 stores hydrogen gas, and the first valve 212 is disposed on the container body 211 to control the opening and closing of the gas flow path of the container body 211. When the first valve 212 is open, the gas flow path of the container body 211 is open, allowing external hydrogen gas to enter the container body 211; when the first valve 212 is closed, the gas flow path of the container body 211 is closed, preventing external hydrogen gas from entering the container body 211.

[0056] In some embodiments, such as Figure 1 As shown, the floating body 22 is at least partially located in the second cavity 112 and is able to rise and fall freely within the second cavity 112.

[0057] There is a gap between the floating body 22 and the cavity wall of the second cavity 112, which is much smaller than the cross-sectional area of ​​the floating body 22.

[0058] In some embodiments, the ratio of the cross-sectional area of ​​the gap between the float 22 and the cavity wall of the second cavity portion 112 to the cross-sectional area of ​​the float 22 is less than or equal to 1%; similarly, the ratio of the cross-sectional area of ​​the test cavity 12 to the cross-sectional area of ​​the float 22 is less than or equal to 1%. This allows the change in liquid level in the test cavity 12 with the amount of hydrogen added to be more pronounced, thereby improving the accuracy of the calibration results.

[0059] The cross-sectional area of ​​the test chamber 12 can be equal to the cross-sectional area of ​​the gap between the float 22 and the cavity wall of the second cavity 112, or it can be greater than the cross-sectional area of ​​the gap between the float 22 and the cavity wall of the second cavity 112, or it can be smaller than the cross-sectional area of ​​the gap between the float 22 and the cavity wall of the second cavity 112.

[0060] In some embodiments, the cross-section of the float 22 is consistent at any height, that is, the float 22 has a regular shape, so as to facilitate the calculation of the liquid surface cross-sectional area of ​​the communicating vessel 1 during the hydrogenation calibration process. The float 22 can be rectangular, cylindrical, or other shapes.

[0061] Understandably, during the hydrogen addition calibration process, the float 22 should always remain floating to ensure that the amount of hydrogen added to the gas storage container 21 is equal to the mass of liquid displaced by the float 22, thereby ensuring the accuracy of the calibration results.

[0062] In some embodiments, the first cavity portion 111 of the receiving cavity 11 is provided with a pipeline interface 113 that communicates with the outside. The gas storage container 21 is connected to the pipeline interface 113 through the gas filling pipeline 23 so as to facilitate connection with an external hydrogen refueling machine.

[0063] The inflation line 23 is suspended in the receiving cavity 11, and the inflation line 23 is a flexible tube, which can minimize the impact of the inflation line 23 on the calibration results.

[0064] The hydrogen dispensing volume calibration system also includes a liquid level detection unit 3, which is used to detect the liquid level height in the test chamber 12.

[0065] When the cavity is empty of any medium, light travels in a straight line when it passes through a cavity with very thin walls. For example... Figure 2 As shown in (a), the incident ray L enters from point A, propagates within the cavity, penetrates the cavity wall, and finally exits from point F. The line connecting points A and F is collinear with the original ray path before incident. When the cavity is filled with a medium, the ray refracts as it passes through the cavity, and upon exiting the cavity, it is deflected by a displacement compared to when no medium is present. Figure 2 As shown in (b), the incident light ray L enters from point A, propagates within the cavity, penetrates the cavity wall, and finally exits from point D. The direction of the line connecting points A and D is not collinear with the original light path direction before incident, and there is a certain angle between the line connecting points A and D and the line connecting points A and F. The liquid level detection unit 3 of this application utilizes this light propagation principle to detect the liquid level height in the test cavity 12.

[0066] In some embodiments, such as Figure 4As shown, the liquid level detection unit 3 includes a signal transmitting band 31 and a signal receiving band 32. The signal transmitting band 31 includes a plurality of transmitters 311 spaced apart in the height direction, and the signal receiving band 32 includes a plurality of receivers 321 spaced apart in the height direction. Each receiver 321 and a transmitter 311 constitute a detector group. The receivers 321 in the detector group are positioned opposite to the transmitters 311 and are located in the same horizontal plane. The receivers 321 in the detector group can receive the signal emitted by the transmitters 311 only when the liquid level in the test chamber 12 is not higher than the set height of the detector group.

[0067] The transmitter 311 emits pulsed light, which shines horizontally when emitted. When there is no liquid at the same height as the receiver 321 in the detector group, the light emitted by the transmitter 311 can pass through the test chamber 12 in a straight line and be received by the receiver 321. When there is liquid at the same height as the receiver 321 in the detector group, the light emitted by the transmitter 311 deviates from its original direction and cannot be received by the receiver 321 in the detector group.

[0068] In some embodiments, a plurality of transmitters 311 are evenly distributed at equal distances, and a plurality of receivers 321 are evenly distributed at equal distances.

[0069] In some embodiments, transmitter 311 is an infrared signal transmitter, and correspondingly, receiver 321 is an infrared signal receiver. The pulsed light emitted by transmitter 311 is infrared light. Of course, transmitter 311 can also be a transmitter that emits other visible light.

[0070] In some embodiments, the cavity wall of the test cavity 12 has a light-absorbing area and a light-transmitting area. The light-transmitting area is provided with a signal receiving band 32, and the area outside the signal receiving band 32 is a light-absorbing area. The light-absorbing area is covered with a light-absorbing material.

[0071] By covering the area outside the signal receiving band 32 with light-absorbing material, a vertical light-transmitting area is reserved for the receiver 321 to receive light. When there is no liquid at the height of the receiver 321 and transmitter 311 in the detector group, the light emitted by the transmitter 311 can pass through the test chamber 12 in a straight line and be received by the receiver 321. When there is liquid at the height of the receiver 321 and transmitter 311 in the detector group, the light emitted by the transmitter 311 deviates from its original direction and shines into the light-absorbing area, where it is absorbed by the light-absorbing material and cannot be received by the receiver 321 in the detector group. The setting of the light-absorbing area can improve the accuracy of liquid level detection in the test chamber 12.

[0072] like Figure 3As shown, when a vertical light surface LABO shines at a certain angle into the cavity GHIJ-KLMN, if there is no liquid medium inside the cavity, each ray of light propagates within surface ABEF, forming a light surface, and the light rays exit from the line EF. If a liquid medium is injected into the cavity, the light rays will be deflected, and the light surface formed within the liquid will be ABCD, with the light rays exiting from the line CD. If a light-absorbing material is applied near line CD, and a light-transmitting material is applied near line EF, then no light will pass through the part of the cavity filled with liquid medium, while light can pass through the part without liquid medium.

[0073] Each transmitter 311 has a physical address, and each receiver 321 has a physical address. The physical addresses of receivers 321 and transmitters 311 in a detector group are the same. Different detector groups have different physical addresses. There is a mapping relationship between physical addresses and height; based on the physical addresses, the vertical height positions of receivers 321 and transmitters 311 can be determined.

[0074] The mapping relationship between physical address and height can be such that the physical addresses of transmitter 311 and receiver 321 gradually increase from low to high in the vertical direction, or it can be such that the physical addresses of transmitter 311 and receiver 321 gradually decrease from low to high in the vertical direction. Of course, the physical addresses of transmitter 311 and receiver 321 do not necessarily have to increase or decrease gradually from low to high in the vertical direction.

[0075] like Figure 4 and Figure 5As shown, the physical addresses of transmitter 311 and receiver 321 increase sequentially from low to high. Assuming that before hydrogen is filled into the gas storage container 21, the liquid level in test chamber 12 is L0, and the physical address of transmitter 311 and receiver 321 corresponding to liquid level L0 is 0x0003, at this time, receivers 321 with physical addresses of 0x0002, 0x0001, and 0x0000 cannot receive the light emitted by their corresponding transmitter 311, while receivers 321 with physical addresses of 0x0003 and above can receive the light emitted by their corresponding transmitter 311. Based on the fact that receiver 321 with physical address 0x0003 receives the light emitted by its corresponding transmitter 311, while receiver 321 with physical address 0x0002 does not, it can be determined that the liquid level in test chamber 12 is between 0x0002 and 0x0003. Assuming hydrogen is filled into the gas storage container 21, the liquid level in the test chamber 12 rises to Lx. The physical address of the transmitter 311 and receiver 321 corresponding to the liquid level Lx is 0x0115. At this point, receivers 321 with physical addresses of 0x0114 and below cannot receive the light emitted by their corresponding transmitter 311, while receivers 321 with physical addresses of 0x0115 and above can receive the light emitted by their corresponding transmitter 311. Based on the fact that receiver 321 with physical address 0x0115 receives the light emitted by its corresponding transmitter 311, while receiver 321 with physical address 0x0114 does not, it can be determined that the liquid level in the test chamber 12 is between 0x0114 and 0x0115.

[0076] like Figure 1 As shown, the hydrogen refueling volume calibration system also includes a control unit 4. The control unit 4 is communicatively connected to the liquid level detection unit 3, that is, the control unit 4 is communicatively connected to each transmitter 311 and receiver 321 in the liquid level detection unit 3.

[0077] In some embodiments, such as Figure 1As shown, the control unit 4 is also electrically connected to the opening regulating valve 61, which is installed on the first connecting pipe 62. The first connecting pipe 62 connects the hydrogen dispenser 7 and the gas supply source 8. By controlling the opening of the opening regulating valve 61, the flow rate of hydrogen entering the hydrogen dispenser 7 can be controlled. The pipe interface 113 is connected to the hydrogen dispenser 7 via the second connecting pipe 63, which connects the hydrogen dispenser 7 to the gas filling pipe 23. When hydrogen is being added to the gas storage container 21, the hydrogen passes sequentially through the gas supply source 8, the first connecting pipe 62, the hydrogen dispenser 7, the second connecting pipe 63, and the gas filling pipe 23 before entering the gas storage container 21. A pressure sensor 9 is installed on the second connecting pipe 63 to detect the pressure value in the second connecting pipe 63. It can be understood that the second connecting pipe 63 is directly connected to the gas filling pipe 23, and the pressure value in the second connecting pipe 63 is the same as the pressure value in the gas filling pipe 23.

[0078] The control unit 4 can function as a processing unit, used to determine the first amount of hydrogen that the hydrogen dispenser will charge into the gas storage container 21 based on the cross-sectional area of ​​the liquid surface in the communicating vessel 1, the liquid level height difference detected by the liquid level detection unit 3, and the liquid density in the communicating vessel 1, and to calibrate the hydrogen dispenser based on the first amount of hydrogen and the amount of hydrogen measured by the hydrogen dispenser. The liquid level height difference is the difference in liquid level height in the test chamber 12 detected by the liquid level detection unit 3 before and after the hydrogen dispenser charges the gas storage container 21.

[0079] In some embodiments, the processing unit may not be the control unit 4; for example, the processing unit may be a cloud platform. Figure 6 As shown. The control unit 4 synchronizes calibration process information to the cloud platform 5, records the calibration process through the cloud platform 5, and further determines the first amount of hydrogen gas to be charged into the gas storage container 21 by the hydrogen dispenser based on the cross-sectional area of ​​the liquid surface in the communicating vessel 1, the liquid level height difference detected by the liquid level detection unit 3, and the liquid density in the communicating vessel 1. The hydrogen dispenser is then calibrated based on the first amount of hydrogen gas and the amount of hydrogen gas measured by the hydrogen dispenser. The setting of the cloud platform 5 facilitates the recording of calibration process information and calibration results, so that the relevant information and calibration results can be viewed later through a mobile phone or PC terminal, and reduces the cache load of the control unit 4.

[0080] The calibration process of the hydrogenation machine will now be described using some examples and in conjunction with the accompanying drawings.

[0081] Figure 7 A flowchart illustrating a hydrogen dispensing capacity calibration method for a hydrogen dispenser according to an embodiment of this application is shown. (See also...) Figure 7 As shown, the calibration method includes at least the following steps S710-S760, which are described in detail below.

[0082] In step S710, before hydrogen is introduced into the gas storage container, the first liquid level height detected by the liquid level detection unit is recorded.

[0083] In step S720, hydrogen gas is introduced into the gas storage container using a hydrogen refueling machine.

[0084] The hydrogen dispenser is capable of measuring the amount of hydrogen it adds to the storage container.

[0085] In step S730, it is determined whether the set gas filling end condition has been met. If so, proceed to step S740; otherwise, continue to execute step S720 to continue filling hydrogen into the gas storage container.

[0086] The conditions for ending the filling process can include the amount of hydrogen measured by the hydrogen dispenser, or the pressure value in the storage container.

[0087] In some embodiments, if the amount of hydrogen measured by the hydrogen dispenser is below the hydrogen quantity threshold and the pressure value in the gas storage container is below the pressure threshold, it is determined that the set gas filling end condition has not been met; otherwise, it is determined that the set gas filling end condition has been met.

[0088] The pressure threshold is lower than the allowable pressure value of the gas storage container to protect the gas storage container and prevent overpressure damage.

[0089] In step S740, the filling of hydrogen into the gas storage container is stopped, and the second liquid level height detected by the liquid level detection unit is recorded.

[0090] In step S750, the amount of first hydrogen gas to be charged into the gas storage container is determined based on the cross-sectional area of ​​the liquid surface in the communicating vessel, the difference between the second liquid level and the first liquid level, and the liquid density in the communicating vessel.

[0091] In step S760, a correction factor for the metered hydrogen quantity of the hydrogen dispenser is determined based on the determined first hydrogen quantity and the hydrogen quantity measured by the hydrogen dispenser.

[0092] exist Figure 7 In the illustrated embodiment, before charging hydrogen into the storage container, the first liquid level height detected by the liquid level detection unit is recorded. Then, hydrogen is charged into the storage container using a hydrogen dispenser. When the set charging end condition is reached, hydrogen charging stops, and the second liquid level height detected by the liquid level detection unit is recorded. Next, based on the principle that buoyancy equals the weight of the fluid displaced by the object, the amount of hydrogen charged into the storage container is determined using the cross-sectional area of ​​the liquid surface in the communicating vessel, the difference between the second and first liquid level heights, and the liquid density in the communicating vessel. Finally, a correction coefficient for the metered hydrogen amount is determined based on the determined first hydrogen amount and the hydrogen amount measured by the hydrogen dispenser. This method can accurately calibrate the correction coefficient for the metered hydrogen amount of the hydrogen dispenser.

[0093] In some embodiments, determining the first amount of hydrogen gas to be charged into the gas storage container based on the cross-sectional area of ​​the liquid surface of the communicating vessel, the difference in liquid level between the second liquid level and the first liquid level, and the liquid density in the communicating vessel includes: obtaining the product of the cross-sectional area of ​​the liquid surface of the communicating vessel, the difference in liquid level between the second liquid level and the first liquid level, and the liquid density in the communicating vessel as the first amount of hydrogen gas to be charged into the gas storage container.

[0094] After hydrogen is introduced into the storage container, the container's mass increases, pulling the float downwards, causing the liquid levels in both the containing chamber and the testing chamber to rise simultaneously. According to the principle of communicating vessels, the inner surfaces of the two chambers become level. Based on the principle of buoyancy, the mass of hydrogen introduced into the storage container is equal to the mass of liquid displaced by the float due to the increase in hydrogen introduction. The mass of liquid displaced by the float due to the increase in hydrogen introduction is m0 = ρSL, where ρ is the liquid density, S is the cross-sectional area of ​​the liquid surface, and L is the difference in liquid level. Figure 8 As shown, the cross-sectional area of ​​the liquid surface S = S1 + S2 - S3, where S1 is the cross-sectional area of ​​the cavity used to accommodate the floating body, i.e., the cross-sectional area of ​​the second cavity, S2 is the cross-sectional area of ​​the liquid surface in the test cavity, and S3 is the cross-sectional area of ​​the floating body. The liquid level difference L = Lx - L0, where Lx is the liquid level height after hydrogen is added to the gas storage container, i.e., the second liquid level height; and L0 is the liquid level height before hydrogen is added to the gas storage container, i.e., the first liquid level height. Therefore, it can be known that the first amount of hydrogen added to the gas storage container is m1 = ρ(S1 + S2 - S3)(Lx - L0).

[0095] In some embodiments, determining a correction factor for the metered hydrogen quantity of the hydrogen dispenser based on the determined first hydrogen quantity and the hydrogen quantity metered by the hydrogen dispenser includes: dividing the determined first hydrogen quantity by the hydrogen quantity metered by the hydrogen dispenser to obtain the correction factor for the metered hydrogen quantity of the hydrogen dispenser.

[0096] During the calibration process, if the first hydrogen quantity determined by the calibration system is m1, the metered hydrogen quantity of the hydrogen dispenser is m2, assuming the reading of the hydrogen dispenser is M2, and the actual dispensed mass is M1, then the relationship m1 / m2=M1 / M2 is satisfied, that is, M1 = (m1 / m2)M2 = [ρ(S1+S2-S3)(Lx-L0) / m2]M2, where the correction coefficient K=ρ(S1+S2-S3)(Lx-L0) / m2.

[0097] After obtaining the correction coefficient K, it can be written into the controller of the hydrogen dispenser. When using the hydrogen dispenser to dispense hydrogen, after the dispensing is completed, the actual amount of hydrogen dispensed is determined based on the correction coefficient and the amount of hydrogen measured by the hydrogen dispenser itself. That is, the product of the amount of hydrogen measured by the hydrogen dispenser itself and the correction coefficient K is used as the actual amount of hydrogen dispensed.

[0098] In some embodiments, such asFigure 9 As shown, the steps for recording the first or second liquid level height detected by the liquid level detection unit include the following steps S910-S930, which are described in detail below.

[0099] In step S910, the physical address of the transmitter of the liquid level detection unit is sent to the transmitter as signal content, and the transmitter sends the signal content to the receiver in the same detector group.

[0100] During this process, if there is no liquid at the height of the detector group, the receiver in the same detector group can receive the signal and feed it back to the control unit; if there is liquid at the height of the detector group, the receiver in the same detector group cannot receive the signal.

[0101] In step S920, when the receiver's received signal is obtained, the received signal is parsed. If the parsed signal content is the same as the receiver's physical address, the receiver's received signal is taken as the correct signal; otherwise, the receiver's received signal is discarded.

[0102] In step S930, the liquid level is determined based on the correct signal.

[0103] That is, the height corresponding to the physical address of the correct signal is determined as the liquid level height.

[0104] by Figure 4For example, after starting the liquid level detection process, the initial liquid level is first detected. The control unit then sequentially transmits the coded signals corresponding to the physical addresses of each transmitter. Specifically, a 0x0001 infrared coded signal is transmitted to the transmitter with physical address 0x0001, causing it to transmit a 0x0001 infrared coded signal to the receiver with physical address 0x0001. Since the liquid level in the test chamber is higher than 0x0001, the light is refracted, so the receiver with physical address 0x0001 cannot receive the 0x0001 infrared coded signal, and therefore the control unit also cannot receive it. Next, a 0x0002 infrared coded signal is transmitted to the transmitter with physical address 0x0002, causing it to transmit a 0x0002 infrared coded signal to the receiver with physical address 0x0002. Because the liquid level in the test chamber is higher than 0x0001, the light is refracted, and the receiver with physical address 0x0001 cannot receive the 0x0001 infrared coded signal. At address 0x0002, light is refracted, so the receiver with physical address 0x0002 cannot receive the 0x0002 infrared coded signal, and the control unit also cannot receive the 0x0002 infrared coded signal. Next, the 0x0003 infrared coded signal is transmitted to the transmitter with physical address 0x0003, causing the transmitter with physical address 0x0003 to transmit the 0x0003 infrared coded signal to the receiver with physical address 0x0003. Since the liquid level in the test chamber is lower than 0x0003, the light travels in a straight line, so the receiver with physical address 0x0003 can receive the 0x0003 infrared coded signal, and the control unit can also receive the 0x0003 infrared coded signal. At this time, the physical address corresponding to L0 is 0x0003. Due to errors, receivers with physical addresses of 0x0004 and 0x0005 may also receive the 0x0003 infrared coded signal. Therefore, the control unit will receive the 0x0003 infrared coded signal fed back by receivers with physical addresses of 0x0003, 0x0004, and 0x0005. By comparing the signal content with the physical address of the receiver, the signal with the same physical address is regarded as the correct signal, and the different one is regarded as interference and discarded. In the end, only the 0x0003 infrared coded signal fed back by the receiver with physical address of 0x0003 is confirmed as the correct signal, and the initial liquid level height, that is, the first liquid level height, can be accurately determined.

[0105] As more hydrogen is added to the storage container, the liquid level in the test chamber increases. Assuming the increased liquid level is Lx, and the physical address corresponding to Lx is 0x0015, then, based on the same method used to detect the initial liquid level, only the 0x0015 infrared coded signal fed back by the receiver with physical address 0x0015 is ultimately confirmed as the correct signal, accurately determining the second liquid level height. The increased liquid level height is L = Lx – L0.

[0106] In some embodiments where a hydrogen refueling machine is connected to a gas storage container via a gas filling pipeline, and the gas storage container includes a container body and a first valve, the first valve being disposed on the container body for controlling the opening and closing of the gas filling pipeline of the container body, the gas pressure in the gas filling pipeline is maintained at a first pressure before the first liquid level height and the second liquid level height detected by the liquid level detection unit are recorded, to ensure that the mass of hydrogen passing through the hydrogen refueling machine and the mass of hydrogen entering the gas storage container are equal.

[0107] like Figure 10 As shown, in one embodiment, the calibration method includes at least the following steps S1010-S1080, which are described in detail below.

[0108] In step S1010, the first valve is closed to block the airflow path of the container body.

[0109] In step S1020, hydrogen gas is introduced into the gas filling pipeline to make the gas pressure in the gas filling pipeline reach the first pressure.

[0110] In step S1030, the first liquid level height detected by the liquid level detection unit is recorded.

[0111] In step S1040, the first valve is opened, and hydrogen is introduced into the gas storage container through the hydrogen dispenser.

[0112] In step S1050, it is determined whether the set gas filling end condition has been met. If so, proceed to step S1060; otherwise, continue to execute step S1040 to continue filling hydrogen into the gas storage container.

[0113] In step S1060, the gas pressure in the gas filling pipeline is set to the first pressure, the filling of hydrogen into the gas storage container is stopped, and the second liquid level height detected by the liquid level detection unit is recorded.

[0114] In step S1070, the amount of first hydrogen gas to be charged into the gas storage container is determined based on the cross-sectional area of ​​the liquid surface in the communicating vessel, the difference between the second liquid level and the first liquid level, and the liquid density in the communicating vessel.

[0115] In step S1080, a correction factor for the metered hydrogen quantity of the hydrogen dispenser is determined based on the determined first hydrogen quantity and the hydrogen quantity measured by the hydrogen dispenser.

[0116] The first pressure is lower than the allowable safe pressure value of the inflation line to protect the inflation line and prevent overpressure damage.

[0117] In some embodiments where the containment cavity has a pipe interface connecting to the outside, and the pipe interface is connected to the gas storage container via a gas filling pipe, and the gas filling pipe is suspended in the containment cavity, before filling the gas storage container with hydrogen through the hydrogen dispenser, the pipe interface on the containment cavity is first connected to the hydrogen dispenser via a second connecting pipe to connect the hydrogen dispenser and the gas filling pipe, thereby connecting the gas storage container and the hydrogen dispenser.

[0118] The overall logic of the calibration method of this application will be described in detail below using a specific embodiment as an example.

[0119] like Figure 11 As shown, the hydrogen addition calibration of the hydrogen dispenser includes five steps: state preparation, calibration process processing, end state processing, data processing, data cloud backup, and tracking of illegal parameter tampering. First, the state preparation step needs to be performed; then, the calibration process processing step is performed; next, the end state processing step is performed; then, the data processing step is performed; and finally, the step of tracking of illegal parameter tampering is performed.

[0120] like Figure 12 As shown, the state preparation steps include the following steps S0101-S0110.

[0121] S0101, set the initial pressure of the pipeline to the first pressure P1.

[0122] S0102, set the hydrogen filling threshold M6 and filling pressure threshold P6 for the gas storage container. The hydrogen filling threshold M6 and filling pressure threshold P6 can be flexibly set according to calibration requirements.

[0123] S0103, open the internal valve of the hydrogen refueling machine to create a passage between the opening regulating valve and the gas storage container.

[0124] S0104, slowly open the opening regulating valve to connect the opening regulating valve and the gas storage container.

[0125] S0105, hydrogen is slowly introduced into the pipeline between the opening regulating valve and the first valve.

[0126] S0106, Detect pipeline pressure P0.

[0127] S0107, determine whether the pipeline pressure P0 has reached the first pressure P1. If yes, proceed to step S0108; otherwise, return to S0105 to continue charging hydrogen.

[0128] S0108, close the opening regulating valve. At this time, the initial state of the passage with pressure P1 will be formed.

[0129] S0109, Hydrogen dispenser reset, hydrogen dispenser reading returns to zero, enters the metering preparation state.

[0130] S0110, read the first liquid level height L0 detected by the liquid level detection unit.

[0131] As Figure 13 shown, the calibration process processing steps include the following steps S0201 - step S0205.

[0132] S0201, open the opening regulating valve and the first valve to slowly fill the hydrogen gas into the gas storage container.

[0133] S0202, detect the pressure P2 in the gas storage container and record the hydrogen gas amount M3 measured by the hydrogen refueling machine.

[0134] S0203, determine whether the pressure P2 in the gas storage container reaches the filling pressure threshold P6 and whether the hydrogen gas amount M3 measured by the hydrogen refueling machine reaches the filling hydrogen amount threshold M6. If P2 < P6 and M3 < M6 are satisfied, continue to execute steps S0201 - S0202; otherwise, enter step S0204.

[0135] S0204, close the first valve to prevent hydrogen gas from entering the gas storage container.

[0136] During this process, read the relevant data, including pipeline pressure, pressure in the gas storage container, temperature, hydrogen gas amount measured by the hydrogen refueling machine, etc., and refresh the control unit cache with the read data to keep the real - time data freshness of the control unit.

[0137] S0205, upload the data in the control unit cache to the cloud platform for long - term data storage.

[0138] As Figure 14 shown, the end - state processing steps include the following steps S0301 - step S0308.

[0139] S0301, turn down the opening regulating valve to reduce the speed of hydrogen gas filling into the pipeline.

[0140] S0302, slowly fill the hydrogen gas into the pipeline between the opening regulating valve and the first valve, and fill it slowly for easy pressure control.

[0141] S0303, detect the pipeline pressure.

[0142] S0304, determine whether the pipeline pressure reaches the first pressure. If so, enter step S0305; otherwise, continue to execute steps S0302 - S0303.

[0143] S0305, close the internal valve of the hydrogen refueling machine.

[0144] S0306, close the opening regulating valve and cut off the gas source at the same time.

[0145] S0307, ​​read the hydrogen volume measured by the hydrogen dispenser and the second liquid level height Lx detected by the liquid level detection unit.

[0146] S0308, upload the data to the cloud platform for data processing.

[0147] like Figure 15 As shown, the data processing steps include the following steps S0401-S0406.

[0148] S0401, calculate the cross-sectional area of ​​the liquid surface: S = S1+S2-S3.

[0149] S0402, Calculate the liquid level height difference: L = Lx - L0.

[0150] S0403, calculate the amount of hydrogen gas introduced in the first charge: m1=ρ(S1+S2-S3)(Lx-L0).

[0151] S0404, Obtain the amount of hydrogen measured by the hydrogen dispenser: m2.

[0152] S0405, calculate the correction factor: K=ρ(S1+S2-S3)(Lx-L0) / m2.

[0153] S0406, Generate a visual data display.

[0154] In the data cloud backup and parameter tampering tracking steps, the serial number of the hydrogen dispenser, the correction coefficient obtained from metering, calibration process-related data (including but not limited to at least one of pipeline pressure, pressure and temperature inside the gas storage container, hydrogen volume metered by the hydrogen dispenser, and calibration time), and calibration personnel information are stored on the cloud platform. When the correction coefficients stored in the cloud platform are tampered with, the cloud platform retrieves the stored correction coefficient data for comparison and tracing.

[0155] In summary, this application utilizes the principle of maintaining a relatively constant liquid level in each chamber of a communicating vessel and the principle of buoyancy. A floating body is fixed together with the gas storage container and placed within the receiving cavity of the communicating vessel. The floating body floats within the receiving cavity and can freely rise and fall within it. The gas storage container is located below the liquid level in the receiving cavity. A liquid level detection unit is installed in the test cavity, which communicates with the receiving cavity, to detect the liquid level height in the test cavity. Based on the difference in liquid level height detected by the liquid level detection unit in the test cavity before and after hydrogen is added to the gas storage container by the hydrogen dispenser, the cross-sectional area of ​​the liquid surface in the communicating vessel, and the liquid density in the communicating vessel, the first amount of hydrogen added to the gas storage container by the hydrogen dispenser is determined. The hydrogen dispenser is then calibrated based on this first amount of hydrogen and the amount of hydrogen measured by the hydrogen dispenser, achieving accurate calibration of the hydrogen measurement correction coefficient.

[0156] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the appended claims.

Claims

1. A hydrogen addition calibration system for a hydrogen dispenser, characterized in that, include: A communicating vessel having a connected receiving cavity and a testing cavity; A gas storage assembly is disposed in the receiving cavity and includes a gas storage container and a floating body. The floating body is fixed together with the gas storage container. The floating body floats in the receiving cavity and can freely rise and fall in the receiving cavity. The gas storage container is located below the liquid level in the receiving cavity. A liquid level detection unit is disposed in the test chamber, and the liquid level detection unit is used to detect the liquid level height in the test chamber; The processing unit is configured to determine the first amount of hydrogen gas to be charged into the gas storage container by the hydrogen dispenser based on the cross-sectional area of ​​the liquid surface in the communicating vessel, the liquid level height difference detected by the liquid level detection unit, and the liquid density in the communicating vessel, and to calibrate the hydrogen dispenser based on the first amount of hydrogen gas and the amount of hydrogen gas measured by the hydrogen dispenser. The liquid level height difference is the difference in liquid level height in the test chamber detected by the liquid level detection unit before and after the hydrogen dispenser charges the gas storage container with hydrogen gas.

2. The system according to claim 1, characterized in that, The receiving cavity includes a first cavity and a second cavity that are connected. The second cavity is located above the first cavity. The liquid level in the receiving cavity is above the first cavity. The float is at least partially located in the second cavity and can move freely up and down within the second cavity. There is a gap between the float and the cavity wall of the second cavity. The ratio of the cross-sectional area of ​​the gap to the cross-sectional area of ​​the float is less than or equal to 1%. The ratio of the cross-sectional area of ​​the test cavity to the cross-sectional area of ​​the float is less than or equal to 1%.

3. The system according to claim 1, characterized in that, The receiving cavity has a pipe interface that connects to the outside world. The pipe interface is connected to the gas storage container through an inflation pipe, which is suspended in the receiving cavity.

4. The system according to claim 1, characterized in that, The cross-section of the floating body is consistent at any height.

5. The system according to any one of claims 1 to 4, characterized in that, The liquid level detection unit includes a signal transmitting band and a signal receiving band. The signal transmitting band includes a plurality of transmitters spaced apart in the height direction, and the signal receiving band includes a plurality of receivers spaced apart in the height direction. Each receiver and a transmitter constitute a detector group. The receivers and transmitters in the detector group are located in the same horizontal plane. The receivers in the detector group can receive the signal emitted by the transmitter if and only if the liquid level in the test chamber is lower than the set height of the detector group.

6. The system according to claim 5, characterized in that, Each of the transmitters has a physical address, each of the receivers has a physical address, and the receivers in the detector group have the same physical address as the transmitters.

7. The system according to claim 5, characterized in that, The transmitter is an infrared signal transmitter, and the receiver is an infrared signal receiver.

8. The system according to claim 5, characterized in that, The test chamber has a light-absorbing area and a light-transmitting area on its wall. The signal receiving band is located in the light-transmitting area, and the area outside the signal receiving band is the light-absorbing area, which is covered with a light-absorbing material.

9. A method for calibrating the hydrogen addition capacity of a hydrogenation machine, characterized in that, For use in the system as described in any one of claims 1 to 8, the method comprises: Before filling the gas storage container with hydrogen, record the first liquid level height detected by the liquid level detection unit; Hydrogen is introduced into the gas storage container by a hydrogen dispenser, which is capable of measuring the amount of hydrogen introduced into the gas storage container. When the set inflation end condition is reached, the inflation of hydrogen into the gas storage container is stopped, and the second liquid level height detected by the liquid level detection unit is recorded. The amount of first hydrogen gas to be charged into the gas storage container is determined based on the cross-sectional area of ​​the liquid surface in the communicating vessel, the difference between the second liquid level and the first liquid level, and the liquid density in the communicating vessel. The correction factor for the metered hydrogen quantity of the hydrogen dispenser is determined based on the first hydrogen quantity and the hydrogen quantity measured by the hydrogen dispenser.

10. The method according to claim 9, characterized in that, The step of determining the amount of first hydrogen gas to be injected into the gas storage container based on the cross-sectional area of ​​the liquid surface in the communicating vessel, the difference between the second liquid level and the first liquid level, and the liquid density in the communicating vessel includes: The product of the cross-sectional area of ​​the liquid surface in the communicating vessel, the difference between the second liquid level and the first liquid level, and the liquid density in the communicating vessel is used as the first amount of hydrogen gas to be charged into the gas storage container. The step of determining the correction factor for the metered hydrogen quantity of the hydrogen dispenser based on the determined first hydrogen quantity and the hydrogen quantity metered by the hydrogen dispenser includes: The correction coefficient for the measured hydrogen quantity of the hydrogen dispenser is obtained by dividing the determined first hydrogen quantity by the hydrogen quantity measured by the hydrogen dispenser.

11. The method according to claim 9, characterized in that, The liquid surface cross-sectional area of ​​the communicating vessel is obtained by subtracting the cross-sectional area of ​​the liquid surface of the receiving cavity from the cross-sectional area of ​​the test cavity, whereby the cross-sectional area of ​​the receiving cavity is the cross-sectional area of ​​the portion of the receiving cavity used to receive the floating body.

12. The method according to claim 9, characterized in that, The recording of the first liquid level height detected by the liquid level detection unit, or the recording of the second liquid level height detected by the liquid level detection unit, includes: The physical address of the transmitter of the liquid level detection unit is sent to the transmitter as the signal content, and the transmitter sends the signal content to the receiver of the liquid level detection unit. A receiver and a transmitter located in the same horizontal plane form a detector group, and the physical address of the receiver and the transmitter in the detector group is the same. When the receiver's received signal is obtained, the received signal is parsed. If the parsed signal content is the same as the receiver's physical address, the receiver's received signal is taken as the correct signal; otherwise, the received signal is discarded. Based on the correct signal, the liquid level height is determined.

13. The method according to claim 9, characterized in that, The hydrogen refueling machine is connected to the gas storage container via a gas filling pipeline. The gas storage container includes a container body and a first valve. The container body is used to store hydrogen gas, and the first valve is disposed on the container body to control the opening and closing of the gas filling pipeline of the container body. Before recording the first liquid level height detected by the liquid level detection unit, the method further includes: The first valve is closed to block the airflow path of the container body; Hydrogen gas is introduced into the inflation line to make the gas pressure in the inflation line reach the first pressure; Before recording the second liquid level height detected by the liquid level detection unit, the method further includes: Hydrogen gas is introduced into the inflation line to make the gas pressure in the inflation line the first pressure.

14. The method according to claim 9, characterized in that, After hydrogen is introduced into the gas storage container via the hydrogen refueling machine, the process further includes: Obtain the amount of hydrogen measured by the hydrogen dispenser and the pressure value in the gas storage container; If the amount of hydrogen measured by the hydrogen dispenser is below the hydrogen quantity threshold and the pressure value in the gas storage container is below the pressure threshold, then hydrogen will continue to be added to the gas storage container; otherwise, it is determined that the set gas filling end condition has been met. Wherein, the pressure threshold is less than the allowable pressure value of the gas storage container.

15. A method for determining the amount of hydrogen added, characterized in that, For use in a hydrogenation machine, the method includes: The correction factor for the metered hydrogen quantity of the hydrogen dispenser is obtained by using the method described in any one of claims 9 to 14; At the end of hydrogen refueling, the actual amount of hydrogen refueling is determined based on the correction factor and the amount of hydrogen measured by the hydrogen refueling machine itself.

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