A method and system for pressure resistance test of high-pressure hydrogen storage tank

Abstract

The present invention discloses a method and system for a pressure test of a high-pressure hydrogen storage tank, wherein the method includes: obtaining first scanned image information of the high-pressure hydrogen storage tank; extracting a comprehensive first similarity value between the first scanned image and a preset image; if the comprehensive first similarity value is greater than a preset first similarity threshold, sending the corresponding high-pressure hydrogen storage tank to a preset station for inflation, and extracting the inflation volume and the first pressure value of the corresponding high-pressure hydrogen storage tank; after the high-pressure hydrogen storage tank is left to stand for a preset first time, extracting the second pressure value and the comprehensive second similarity value of the high-pressure hydrogen storage tank; performing a difference calculation between the second pressure value and the first pressure value of the high-pressure hydrogen storage tank to obtain a first pressure difference; if the first pressure difference is less than the preset first pressure difference threshold and the comprehensive second similarity value is greater than the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank pressure test is qualified. The present invention improves the accuracy of the pressure test of the high-pressure hydrogen storage tank.

Description

Technical Field

[0001] The present application relates to the field of hydrogen technology, and more specifically, to a pressure resistance test method and system for high-pressure hydrogen storage tanks. Background Art

[0002] Existing pressure tests of high-pressure hydrogen storage tanks are all carried out in a stable environment, but the actual application environment of high-pressure hydrogen storage tanks is relatively complex and diverse. Therefore, the current pressure test results have limitations.

[0003] Therefore, the prior art has defects and needs to be improved urgently. Summary of the invention

[0004] In view of the above problems, an object of the present invention is to provide a method and system for a pressure test of a high-pressure hydrogen storage tank, which can more effectively improve the accuracy of the pressure test of the high-pressure hydrogen storage tank.

[0005] A first aspect of the present invention provides a pressure test method for a high-pressure hydrogen storage tank, comprising:

[0006] Acquire first scanning image information of the high-pressure hydrogen storage tank;

[0007] Extracting a comprehensive first similarity value between the first scanned image and the preset image;

[0008] If the comprehensive first similarity value is greater than the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank is sent to a preset station for inflation, and the inflation volume and the first pressure value of the corresponding high-pressure hydrogen storage tank are extracted;

[0009] After the high-pressure hydrogen storage tank is left to stand for a preset first time, a second pressure value and a comprehensive second similarity value of the high-pressure hydrogen storage tank are extracted;

[0010] Calculating the difference between the second pressure value and the first pressure value of the high-pressure hydrogen storage tank to obtain a first pressure difference;

[0011] If the first pressure difference value is less than the preset first pressure difference threshold and the comprehensive second similarity value is greater than the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank pressure resistance test is qualified.

[0012] In this solution, the step of extracting the comprehensive first similarity value between the first scanned image and the preset image specifically includes:

[0013] Extracting features and corresponding feature values ​​in the first scanned image; extracting features and corresponding feature average values ​​in the preset image;

[0014] Based on the same features, the feature values ​​in the first scanned image and the feature average values ​​in the preset image are compared and analyzed, and the smaller value is divided by the larger value to obtain the corresponding feature similarity value;

[0015] The feature similarity value is multiplied by the corresponding feature proportion weight coefficient, and then accumulated to obtain a comprehensive first similarity value corresponding to the first scanned image and the preset image.

[0016] In this solution, the step of extracting features in a preset image and corresponding feature average values ​​specifically includes:

[0017] Extract feature values ​​from a preset image;

[0018] Calculate the average value of the characteristic values ​​in the preset image to obtain a first average value;

[0019] Calculate the difference between the first average value and the characteristic value in the preset image to obtain a first average difference;

[0020] If the first average difference is greater than a preset first average difference threshold, deleting the feature value in the preset image corresponding to the first average difference;

[0021] After the feature value in the preset image corresponding to the first average difference is deleted, the first average value is recalculated until the first average difference is less than or equal to the preset first average difference threshold;

[0022] When all the first average difference values ​​are less than or equal to a preset first average difference threshold, the first average difference value is set as the corresponding feature average value.

[0023] This plan also includes:

[0024] When the high-pressure hydrogen storage tank is being inflated, the inflation speed value is obtained;

[0025] Determine whether the inflation speed value is within a preset inflation speed range. If so, the inflation speed of the corresponding high-pressure hydrogen storage tank is qualified; if not, extract the cumulative time value of the inflation speed value that is not within the preset inflation speed range;

[0026] Obtain the total time value of the high-pressure hydrogen storage tank being filled with gas, and set it as the first total time value;

[0027] The accumulated time value when the inflation speed value is not within the preset inflation speed range is divided by the first total time value to obtain the time proportion value of unreasonable inflation;

[0028] If the time proportion value of unreasonable inflation is greater than the preset first time threshold, the corresponding high-pressure hydrogen storage tank will be re-inflated.

[0029] This plan also includes:

[0030] Divide the high-pressure hydrogen storage tank into two sub-times, namely, a first sub-time and a second sub-time;

[0031] When the high-pressure hydrogen storage tank is stationary for a first sub-time, obtaining a first temperature value of a preset temperature detection point;

[0032] Extract the first temperature values ​​of any two preset temperature detection points to perform difference calculation, and take the absolute value to obtain a first temperature difference;

[0033] Determine whether the first temperature difference is less than or equal to a preset first temperature difference threshold value. If so, record the pressure of the corresponding high-pressure hydrogen storage tank and set it as the first static pressure; if not, record the accumulated time value that the first temperature difference is greater than the preset first temperature difference threshold value;

[0034] If the accumulated time value during which the first temperature difference is greater than the preset first temperature difference threshold is less than the preset second time threshold, extracting any two first static pressures for difference calculation to obtain a first static pressure difference set;

[0035] If the first static pressure difference value in the first static pressure difference value set is greater than the preset first static pressure difference threshold, then the total number of the first static pressure difference values ​​greater than the preset first static pressure difference threshold is recorded;

[0036] If the total number of the first static pressure difference values ​​greater than the preset first static pressure difference threshold is greater than the preset first number threshold, the corresponding high-pressure hydrogen storage tank is unqualified;

[0037] If the total number of first static pressure difference values ​​greater than the preset first static pressure difference threshold is less than or equal to the preset first number threshold, the high-pressure hydrogen storage tank is left to stand for a second sub-time.

[0038] This plan also includes:

[0039] When the high pressure hydrogen storage tank is left to stand for a second period of time;

[0040] Obtain a second temperature value of a preset temperature detection point;

[0041] Extract the second temperature values ​​of any two preset temperature detection points to perform difference calculation, and take the absolute value to obtain the second temperature difference;

[0042] Determine whether the second temperature difference is greater than or equal to a preset second temperature difference threshold value. If so, record the pressure of the corresponding high-pressure hydrogen storage tank and set it as the second static pressure; if not, record the accumulated time value that the second temperature difference is less than the preset second temperature difference threshold value;

[0043] If the accumulated time value during which the second temperature difference is less than the preset second temperature difference threshold is greater than the preset second time threshold, the corresponding high-pressure hydrogen storage tank is unqualified for standing;

[0044] If the accumulated time value of the second temperature difference value being less than the preset second temperature difference threshold value is less than or equal to the preset second time threshold value, when there is only one second static pressure, the corresponding second static pressure will be set to the second pressure value; when there are multiple second static pressures, the corresponding multiple second static pressures will be averaged to obtain the second pressure value.

[0045] This plan also includes:

[0046] If the first pressure difference value is greater than or equal to the preset first pressure difference threshold or the comprehensive second similarity value is less than or equal to the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank pressure test is unqualified, and the number of unqualified high-pressure hydrogen storage tanks is recorded;

[0047] Extract the total quantity value of the high-pressure hydrogen storage tank for pressure resistance test;

[0048] The number of unqualified high-pressure hydrogen storage tanks is divided by the total number of high-pressure hydrogen storage tanks subjected to the pressure test to obtain the unqualified rate of the pressure test of the high-pressure hydrogen storage tanks;

[0049] If the failure rate of the pressure test of the high-pressure hydrogen storage tank is greater than the preset failure rate threshold, a warning message is triggered and the warning message is sent to the preset management terminal for display.

[0050] A second aspect of the present invention provides a high-pressure hydrogen storage tank pressure test system, comprising a memory and a processor, wherein the memory stores a high-pressure hydrogen storage tank pressure test method program, and when the high-pressure hydrogen storage tank pressure test method program is executed by the processor, the following steps are implemented:

[0051] Acquire first scanning image information of the high-pressure hydrogen storage tank;

[0052] Extracting a comprehensive first similarity value between the first scanned image and the preset image;

[0053] If the comprehensive first similarity value is greater than the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank is sent to a preset station for inflation, and the inflation volume and the first pressure value of the corresponding high-pressure hydrogen storage tank are extracted;

[0054] After the high-pressure hydrogen storage tank is left to stand for a preset first time, a second pressure value and a comprehensive second similarity value of the high-pressure hydrogen storage tank are extracted;

[0055] Calculating the difference between the second pressure value and the first pressure value of the high-pressure hydrogen storage tank to obtain a first pressure difference;

[0056] If the first pressure difference value is less than the preset first pressure difference threshold and the comprehensive second similarity value is greater than the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank pressure resistance test is qualified.

[0057] In this solution, the step of extracting the comprehensive first similarity value between the first scanned image and the preset image specifically includes:

[0058] Extracting features and corresponding feature values ​​in the first scanned image; extracting features and corresponding feature average values ​​in the preset image;

[0059] Based on the same features, the feature values ​​in the first scanned image and the feature average values ​​in the preset image are compared and analyzed, and the smaller value is divided by the larger value to obtain the corresponding feature similarity value;

[0060] The feature similarity value is multiplied by the corresponding feature proportion weight coefficient, and then accumulated to obtain a comprehensive first similarity value corresponding to the first scanned image and the preset image.

[0061] In this solution, the step of extracting features in a preset image and corresponding feature average values ​​specifically includes:

[0062] Extract feature values ​​from a preset image;

[0063] Calculate the average value of the characteristic values ​​in the preset image to obtain a first average value;

[0064] Calculate the difference between the first average value and the characteristic value in the preset image to obtain a first average difference;

[0065] If the first average difference is greater than a preset first average difference threshold, deleting the feature value in the preset image corresponding to the first average difference;

[0066] After the feature value in the preset image corresponding to the first average difference is deleted, the first average value is recalculated until the first average difference is less than or equal to the preset first average difference threshold;

[0067] When all the first average difference values ​​are less than or equal to a preset first average difference threshold, the first average difference value is set as the corresponding feature average value.

[0068] The present invention discloses a method and system for a pressure test of a high-pressure hydrogen storage tank. By adjusting the environmental factors of the high-pressure hydrogen storage tank during the test and detection process, multiple aspects such as the changes in the appearance characteristics of the high-pressure hydrogen storage tank under different environments and the sealing performance are comprehensively considered, thereby improving the accuracy of the pressure test of the high-pressure hydrogen storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 A flow chart showing a method for pressure resistance testing of a high-pressure hydrogen storage tank according to the present invention is shown;

[0070] Figure 2 A block diagram of a high-pressure hydrogen storage tank pressure test system of the present invention is shown. DETAILED DESCRIPTION

[0071] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0072] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0073] Figure 1 A flow chart of a pressure resistance test method for a high-pressure hydrogen storage tank of the present invention is shown.

[0074] like Figure 1 As shown, the present invention discloses a pressure test method for a high-pressure hydrogen storage tank, comprising:

[0075] S101, obtaining first scanning image information of a high-pressure hydrogen storage tank;

[0076] S102, extracting a comprehensive first similarity value between the first scanned image and the preset image;

[0077] S103, if the comprehensive first similarity value is greater than the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank is sent to a preset station for inflation, and the inflation volume and the first pressure value of the corresponding high-pressure hydrogen storage tank are extracted;

[0078] S104, after the high-pressure hydrogen storage tank is left to stand for a preset first time, extracting a second pressure value and a comprehensive second similarity value of the high-pressure hydrogen storage tank;

[0079] S105, calculating the difference between the second pressure value and the first pressure value of the high-pressure hydrogen storage tank to obtain a first pressure difference;

[0080] S106: If the first pressure difference value is less than the preset first pressure difference threshold and the comprehensive second similarity value is greater than the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank pressure test is qualified.

[0081] According to an embodiment of the present invention, before the high-pressure hydrogen storage tank undergoes a pressure test, it is scanned by a preset scanning device to obtain first scanned image information. When the pressure test of the high-pressure hydrogen storage tank is qualified, the first scanned image of the corresponding high-pressure hydrogen storage tank is sent to a preset image library for storage. The preset image library stores no less than 2 preset images. When the comprehensive first similarity value is greater than the preset first similarity threshold, it indicates that the appearance of the corresponding high-pressure hydrogen storage tank is normal. After the high-pressure hydrogen storage tank stops being inflated, the corresponding high-pressure hydrogen storage tank is left to stand for timing. The first pressure value and the second pressure value are greater than the standard storage pressure of the corresponding high-pressure hydrogen storage tank. The first pressure value is determined by the gas filled in. The gas filled in is an inert gas, and the amount of gas filled in each pressure-resistant hydrogen storage tank is the same. After the high-pressure hydrogen storage tank is left to stand for a preset first time, it is scanned by a preset scanning device to obtain second scanned image information. The second scanned image is then compared and analyzed with the preset image to obtain a comprehensive second similarity value. The calculation step principle is the same as the calculation principle of the comprehensive first similarity value.

[0082] According to an embodiment of the present invention, the step of extracting a comprehensive first similarity value between the first scanned image and the preset image specifically includes:

[0083] Extracting features and corresponding feature values ​​in the first scanned image; extracting features and corresponding feature average values ​​in the preset image;

[0084] Based on the same features, the feature values ​​in the first scanned image and the feature average values ​​in the preset image are compared and analyzed, and the smaller value is divided by the larger value to obtain the corresponding feature similarity value;

[0085] The feature similarity value is multiplied by the corresponding feature proportion weight coefficient, and then accumulated to obtain a comprehensive first similarity value corresponding to the first scanned image and the preset image.

[0086] It should be noted that the features in the first scanned image refer to the various components in the high-pressure hydrogen storage tank, and the corresponding feature values ​​are the size values ​​of the various components. Whether the size of the corresponding high-pressure hydrogen storage tank is qualified is determined by the comprehensive first similarity value between the first scanned image and the preset image.

[0087] According to an embodiment of the present invention, the step of extracting features in a preset image and corresponding feature average values ​​specifically includes:

[0088] Extract feature values ​​from a preset image;

[0089] Calculate the average value of the characteristic values ​​in the preset image to obtain a first average value;

[0090] Calculate the difference between the first average value and the characteristic value in the preset image to obtain a first average difference;

[0091] If the first average difference is greater than a preset first average difference threshold, deleting the feature value in the preset image corresponding to the first average difference;

[0092] After the feature value in the preset image corresponding to the first average difference is deleted, the first average value is recalculated until the first average difference is less than or equal to the preset first average difference threshold;

[0093] When all the first average difference values ​​are less than or equal to a preset first average difference threshold, the first average difference value is set as the corresponding feature average value.

[0094] It should be noted that, by presetting the first average difference threshold to determine the first average difference, the accuracy of the feature average value is improved.

[0095] According to an embodiment of the present invention, it also includes:

[0096] When the high-pressure hydrogen storage tank is being inflated, the inflation speed value is obtained;

[0097] Determine whether the inflation speed value is within a preset inflation speed range. If so, the inflation speed of the corresponding high-pressure hydrogen storage tank is qualified; if not, extract the cumulative time value of the inflation speed value that is not within the preset inflation speed range;

[0098] Obtain the total time value of the high-pressure hydrogen storage tank being filled with gas, and set it as the first total time value;

[0099] The accumulated time value when the inflation speed value is not within the preset inflation speed range is divided by the first total time value to obtain the time proportion value of unreasonable inflation;

[0100] If the time proportion value of unreasonable inflation is greater than the preset first time threshold, the corresponding high-pressure hydrogen storage tank will be re-inflated.

[0101] It should be noted that the inflation speed value is greater than or equal to the maximum standard inflation speed value of the corresponding high-pressure hydrogen storage tank. For example, the preset inflation speed range is from the maximum standard inflation speed value to 1.2 times the maximum standard inflation speed value. By testing the high-pressure hydrogen storage tank at an unreasonable inflation speed that is greater than the conventional inflation speed, it is possible to ensure that the corresponding high-pressure hydrogen storage tank can adapt to various unconventional operations during normal use.

[0102] According to an embodiment of the present invention, it also includes:

[0103] Divide the high-pressure hydrogen storage tank into two sub-times, namely, a first sub-time and a second sub-time;

[0104] When the high-pressure hydrogen storage tank is stationary for a first sub-time, obtaining a first temperature value of a preset temperature detection point;

[0105] Extract the first temperature values ​​of any two preset temperature detection points to perform difference calculation, and take the absolute value to obtain a first temperature difference;

[0106] Determine whether the first temperature difference is less than or equal to a preset first temperature difference threshold value. If so, record the pressure of the corresponding high-pressure hydrogen storage tank and set it as the first static pressure; if not, record the accumulated time value that the first temperature difference is greater than the preset first temperature difference threshold value;

[0107] If the accumulated time value during which the first temperature difference is greater than the preset first temperature difference threshold is less than the preset second time threshold, extracting any two first static pressures for difference calculation to obtain a first static pressure difference set;

[0108] If the first static pressure difference value in the first static pressure difference value set is greater than the preset first static pressure difference threshold, then the total number of the first static pressure difference values ​​greater than the preset first static pressure difference threshold is recorded;

[0109] If the total number of the first static pressure difference values ​​greater than the preset first static pressure difference threshold is greater than the preset first number threshold, the corresponding high-pressure hydrogen storage tank is unqualified;

[0110] If the total number of first static pressure difference values ​​greater than the preset first static pressure difference threshold is less than or equal to the preset first number threshold, the high-pressure hydrogen storage tank is left to stand for a second sub-time.

[0111] It should be noted that the first static sub-time of the high-pressure hydrogen storage tank is used to determine whether the corresponding high-pressure hydrogen storage tank has a leak. If the total number of the first static pressure difference value that is greater than the preset first static pressure difference threshold value is greater than the preset first number threshold value, it means that the corresponding high-pressure hydrogen storage tank has a leak, and the corresponding high-pressure hydrogen storage tank is unqualified. The number of the preset temperature detection points is not less than 2.

[0112] According to an embodiment of the present invention, it also includes:

[0113] When the high pressure hydrogen storage tank is left to stand for a second period of time;

[0114] Obtain a second temperature value of a preset temperature detection point;

[0115] Extract the second temperature values ​​of any two preset temperature detection points to perform difference calculation, and take the absolute value to obtain the second temperature difference;

[0116] Determine whether the second temperature difference is greater than or equal to a preset second temperature difference threshold value. If so, record the pressure of the corresponding high-pressure hydrogen storage tank and set it as the second static pressure; if not, record the accumulated time value that the second temperature difference is less than the preset second temperature difference threshold value;

[0117] If the accumulated time value during which the second temperature difference is less than the preset second temperature difference threshold is greater than the preset second time threshold, the corresponding high-pressure hydrogen storage tank is unqualified for standing;

[0118] If the accumulated time value of the second temperature difference value being less than the preset second temperature difference threshold value is less than or equal to the preset second time threshold value, when there is only one second static pressure, the corresponding second static pressure will be set to the second pressure value; when there are multiple second static pressures, the corresponding multiple second static pressures will be averaged to obtain the second pressure value.

[0119] It should be noted that when the high-pressure hydrogen storage tank is left standing for the second sub-time, the temperature difference in the high-pressure hydrogen storage tank is adjusted, thereby causing a pressure difference in the corresponding high-pressure hydrogen storage tank. This is a common environment in actual use. For example, if one side of the high-pressure hydrogen storage tank is close to a fire source, then the temperature of the corresponding side close to the fire source is higher than the side away from the fire source. If the high-pressure hydrogen storage tank can still work normally when the second temperature difference is greater than or equal to the preset second temperature difference threshold, the corresponding high-pressure hydrogen storage tank is qualified.

[0120] According to an embodiment of the present invention, it also includes:

[0121] If the first pressure difference value is greater than or equal to the preset first pressure difference threshold or the comprehensive second similarity value is less than or equal to the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank pressure test is unqualified, and the number of unqualified high-pressure hydrogen storage tanks is recorded;

[0122] Extract the total quantity value of the high-pressure hydrogen storage tank for pressure resistance test;

[0123] The number of unqualified high-pressure hydrogen storage tanks is divided by the total number of high-pressure hydrogen storage tanks subjected to the pressure test to obtain the unqualified rate of the pressure test of the high-pressure hydrogen storage tanks;

[0124] If the failure rate of the pressure test of the high-pressure hydrogen storage tank is greater than the preset failure rate threshold, a warning message is triggered and the warning message is sent to the preset management terminal for display.

[0125] It should be noted that there are requirements for the unqualified rate of each batch of products. For example, if the preset unqualified rate threshold is 0.01%, it means that one unqualified product is allowed to appear in 10,000 high-pressure hydrogen storage tanks in the corresponding batch. If there is more than one unqualified high-pressure hydrogen storage tank, a warning message will be triggered.

[0126] According to an embodiment of the present invention, it also includes:

[0127] After the high-pressure hydrogen storage tank is left to stand for a preset first time, the gas in the high-pressure hydrogen storage tank is released through a maximum air release valve, and when the gas is completely released, a third scanning image of the corresponding high-pressure hydrogen storage tank is obtained;

[0128] extracting a comprehensive third similarity value between the third scanned image and the preset image;

[0129] It is determined whether the comprehensive third similarity value is greater than a preset first similarity threshold value. If so, the corresponding high-pressure hydrogen storage tank is qualified; if not, the corresponding high-pressure hydrogen storage tank is unqualified.

[0130] According to an embodiment of the present invention, when the high-pressure hydrogen storage tank releases the gas in the high-pressure hydrogen storage tank with the maximum air release valve, a pressure difference is likely to appear in the high-pressure hydrogen storage tank. When a pressure difference appears in the high-pressure hydrogen storage tank, the comprehensive third similarity value of the corresponding high-pressure hydrogen storage tank is still greater than the preset first similarity threshold, indicating that the corresponding high-pressure hydrogen storage tank is qualified.

[0131] Figure 2 A block diagram of a high-pressure hydrogen storage tank pressure test system of the present invention is shown.

[0132] like Figure 2 As shown, the second aspect of the present invention provides a high-pressure hydrogen storage tank pressure test system 2, including a memory 21 and a processor 22, wherein the memory stores a high-pressure hydrogen storage tank pressure test method program, and the high-pressure hydrogen storage tank pressure test method program is executed by the processor to implement the following steps:

[0133] Acquire first scanning image information of the high-pressure hydrogen storage tank;

[0134] Extracting a comprehensive first similarity value between the first scanned image and the preset image;

[0135] If the comprehensive first similarity value is greater than the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank is sent to a preset station for inflation, and the inflation volume and the first pressure value of the corresponding high-pressure hydrogen storage tank are extracted;

[0136] After the high-pressure hydrogen storage tank is left to stand for a preset first time, a second pressure value and a comprehensive second similarity value of the high-pressure hydrogen storage tank are extracted;

[0137] Calculating the difference between the second pressure value and the first pressure value of the high-pressure hydrogen storage tank to obtain a first pressure difference;

[0138] If the first pressure difference value is less than the preset first pressure difference threshold and the comprehensive second similarity value is greater than the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank pressure resistance test is qualified.

[0139] According to an embodiment of the present invention, the step of extracting a comprehensive first similarity value between the first scanned image and the preset image specifically includes:

[0140] Extracting features and corresponding feature values ​​in the first scanned image; extracting features and corresponding feature average values ​​in the preset image;

[0141] Based on the same features, the feature values ​​in the first scanned image and the feature average values ​​in the preset image are compared and analyzed, and the smaller value is divided by the larger value to obtain the corresponding feature similarity value;

[0142] The feature similarity value is multiplied by the corresponding feature proportion weight coefficient, and then accumulated to obtain a comprehensive first similarity value corresponding to the first scanned image and the preset image.

[0143] According to an embodiment of the present invention, the step of extracting features in a preset image and corresponding feature average values ​​specifically includes:

[0144] Extract feature values ​​from a preset image;

[0145] Calculate the average value of the characteristic values ​​in the preset image to obtain a first average value;

[0146] Calculate the difference between the first average value and the characteristic value in the preset image to obtain a first average difference;

[0147] If the first average difference is greater than a preset first average difference threshold, deleting the feature value in the preset image corresponding to the first average difference;

[0148] After the feature value in the preset image corresponding to the first average difference is deleted, the first average value is recalculated until the first average difference is less than or equal to the preset first average difference threshold;

[0149] When all the first average difference values ​​are less than or equal to a preset first average difference threshold, the first average difference value is set as the corresponding feature average value.

[0150] The invention discloses a method and system for a pressure test of a high-pressure hydrogen storage tank, which improves the accuracy of the pressure test of the high-pressure hydrogen storage tank.

[0151] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0152] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0153] In addition, all functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0154] A person of ordinary skill in the art can understand that: all or part of the steps of implementing the above method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiment; and the aforementioned storage medium includes: a mobile storage device, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0155] Alternatively, if the above-mentioned integrated unit of the present invention is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present invention can be essentially or partly reflected in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROM, RAM, magnetic disks or optical disks.

Claims

1. A pressure test method for a high-pressure hydrogen storage tank, characterized in that: include: Acquire first scanning image information of the high-pressure hydrogen storage tank; Extracting a comprehensive first similarity value between the first scanned image and the preset image; If the comprehensive first similarity value is greater than the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank is sent to a preset station for inflation, and the inflation volume and the first pressure value of the corresponding high-pressure hydrogen storage tank are extracted; After the high-pressure hydrogen storage tank is left to stand for a preset first time, a second pressure value and a comprehensive second similarity value of the high-pressure hydrogen storage tank are extracted; Calculating the difference between the second pressure value and the first pressure value of the high-pressure hydrogen storage tank to obtain a first pressure difference; If the first pressure difference value is less than the preset first pressure difference threshold and the comprehensive second similarity value is greater than the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank pressure test is qualified; Also includes: Divide the high-pressure hydrogen storage tank into two sub-times, namely, a first sub-time and a second sub-time; When the high-pressure hydrogen storage tank is stationary for a first sub-time, obtaining a first temperature value of a preset temperature detection point; Extract the first temperature values ​​of any two preset temperature detection points to perform difference calculation, and take the absolute value to obtain a first temperature difference; Determine whether the first temperature difference is less than or equal to a preset first temperature difference threshold value. If so, record the pressure of the corresponding high-pressure hydrogen storage tank and set it as the first static pressure; if not, record the accumulated time value that the first temperature difference is greater than the preset first temperature difference threshold value; If the accumulated time value during which the first temperature difference is greater than the preset first temperature difference threshold is less than the preset second time threshold, extracting any two first static pressures for difference calculation to obtain a first static pressure difference set; If the first static pressure difference value in the first static pressure difference value set is greater than the preset first static pressure difference threshold, then the total number of the first static pressure difference values ​​greater than the preset first static pressure difference threshold is recorded; If the total number of the first static pressure difference values ​​greater than the preset first static pressure difference threshold is greater than the preset first number threshold, the corresponding high-pressure hydrogen storage tank is unqualified; If the total number of the first static pressure difference values ​​greater than the preset first static pressure difference threshold is less than or equal to the preset first number threshold, the high-pressure hydrogen storage tank is static for a second sub-time; The step of extracting a comprehensive first similarity value between the first scanned image and the preset image specifically includes: Extracting features and corresponding feature values ​​in the first scanned image; extracting features and corresponding feature average values ​​in the preset image; Based on the same features, the feature values ​​in the first scanned image and the feature average values ​​in the preset image are compared and analyzed, and the smaller value is divided by the larger value to obtain the corresponding feature similarity value; Multiply the feature similarity value by the corresponding feature proportion weight coefficient, and then add them up to obtain a comprehensive first similarity value corresponding to the first scanned image and the preset image; The step of extracting features from a preset image and corresponding feature averages specifically includes: Extract feature values ​​from a preset image; Calculate the average value of the characteristic values ​​in the preset image to obtain a first average value; Calculate the difference between the first average value and the characteristic value in the preset image to obtain a first average difference; If the first average difference is greater than a preset first average difference threshold, deleting the feature value in the preset image corresponding to the first average difference; After the feature value in the preset image corresponding to the first average difference is deleted, the first average value is recalculated until the first average difference is less than or equal to the preset first average difference threshold; When all the first average difference values ​​are less than or equal to the preset first average difference threshold, the first average difference is set as the corresponding feature average value; The method for extracting the comprehensive second similarity value is as follows: after the high-pressure hydrogen storage tank is left to stand for a preset first time, it is scanned by a preset scanning device to obtain second scan image information, and then the second scan image and the preset image are compared and analyzed to obtain a comprehensive second similarity value; the calculation principle is the same as the calculation principle of the comprehensive first similarity value.

2. A pressure test method for a high-pressure hydrogen storage tank according to claim 1, characterized in that: Also includes: When the high-pressure hydrogen storage tank is being inflated, the inflation speed value is obtained; Determine whether the inflation speed value is within a preset inflation speed range. If so, the inflation speed of the corresponding high-pressure hydrogen storage tank is qualified; if not, extract the cumulative time value of the inflation speed value that is not within the preset inflation speed range; Obtain the total time value of the high-pressure hydrogen storage tank being filled with gas, and set it as the first total time value; The accumulated time value when the inflation speed value is not within the preset inflation speed range is divided by the first total time value to obtain the time proportion value of unreasonable inflation; If the time proportion value of unreasonable inflation is greater than the preset first time threshold, the corresponding high-pressure hydrogen storage tank will be re-inflated.

3. A pressure test method for a high-pressure hydrogen storage tank according to claim 1, characterized in that: Also includes: When the high pressure hydrogen storage tank is left to stand for a second period of time; Obtain a second temperature value of a preset temperature detection point; Extract the second temperature values ​​of any two preset temperature detection points to perform difference calculation, and take the absolute value to obtain the second temperature difference; Determine whether the second temperature difference is greater than or equal to a preset second temperature difference threshold value. If so, record the pressure of the corresponding high-pressure hydrogen storage tank and set it as the second static pressure; if not, record the accumulated time value that the second temperature difference is less than the preset second temperature difference threshold value; If the accumulated time value during which the second temperature difference is less than the preset second temperature difference threshold is greater than the preset second time threshold, the corresponding high-pressure hydrogen storage tank is unqualified for standing; If the accumulated time value of the second temperature difference value being less than the preset second temperature difference threshold value is less than or equal to the preset second time threshold value, when there is only one second static pressure, the corresponding second static pressure will be set to the second pressure value; when there are multiple second static pressures, the corresponding multiple second static pressures will be averaged to obtain the second pressure value.

4. A pressure test method for a high-pressure hydrogen storage tank according to claim 1, characterized in that: Also includes: If the first pressure difference value is greater than or equal to the preset first pressure difference threshold or the comprehensive second similarity value is less than or equal to the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank pressure test is unqualified, and the number of unqualified high-pressure hydrogen storage tanks is recorded; Extract the total quantity value of the high-pressure hydrogen storage tank for pressure resistance test; The number of unqualified high-pressure hydrogen storage tanks is divided by the total number of high-pressure hydrogen storage tanks subjected to the pressure test to obtain the unqualified rate of the pressure test of the high-pressure hydrogen storage tanks; If the failure rate of the pressure test of the high-pressure hydrogen storage tank is greater than the preset failure rate threshold, a warning message is triggered and the warning message is sent to the preset management terminal for display.

5. A high-pressure hydrogen storage tank pressure test system, characterized in that: The invention comprises a memory and a processor, wherein the memory stores a high-pressure hydrogen storage tank pressure test method program, and when the high-pressure hydrogen storage tank pressure test method program is executed by the processor, the following steps are implemented: Acquire first scanning image information of the high-pressure hydrogen storage tank; Extracting a comprehensive first similarity value between the first scanned image and the preset image; If the comprehensive first similarity value is greater than the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank is sent to a preset station for inflation, and the inflation volume and the first pressure value of the corresponding high-pressure hydrogen storage tank are extracted; After the high-pressure hydrogen storage tank is left to stand for a preset first time, a second pressure value and a comprehensive second similarity value of the high-pressure hydrogen storage tank are extracted; Calculating the difference between the second pressure value and the first pressure value of the high-pressure hydrogen storage tank to obtain a first pressure difference; If the first pressure difference value is less than the preset first pressure difference threshold and the comprehensive second similarity value is greater than the preset first similarity threshold, the corresponding high-pressure hydrogen storage tank pressure test is qualified; Also includes: Divide the high-pressure hydrogen storage tank into two sub-times, namely, a first sub-time and a second sub-time; When the high-pressure hydrogen storage tank is stationary for a first sub-time, obtaining a first temperature value of a preset temperature detection point; Extract the first temperature values ​​of any two preset temperature detection points to perform difference calculation, and take the absolute value to obtain a first temperature difference; Determine whether the first temperature difference is less than or equal to a preset first temperature difference threshold value. If so, record the pressure of the corresponding high-pressure hydrogen storage tank and set it as the first static pressure; if not, record the accumulated time value that the first temperature difference is greater than the preset first temperature difference threshold value; If the accumulated time value during which the first temperature difference is greater than the preset first temperature difference threshold is less than the preset second time threshold, extracting any two first static pressures for difference calculation to obtain a first static pressure difference set; If the first static pressure difference value in the first static pressure difference value set is greater than the preset first static pressure difference threshold, then the total number of the first static pressure difference values ​​greater than the preset first static pressure difference threshold is recorded; If the total number of the first static pressure difference values ​​greater than the preset first static pressure difference threshold is greater than the preset first number threshold, the corresponding high-pressure hydrogen storage tank is unqualified; If the total number of the first static pressure difference values ​​greater than the preset first static pressure difference threshold is less than or equal to the preset first number threshold, the high-pressure hydrogen storage tank is static for a second sub-time; The step of extracting a comprehensive first similarity value between the first scanned image and the preset image specifically includes: Extracting features and corresponding feature values ​​in the first scanned image; extracting features and corresponding feature average values ​​in the preset image; Based on the same features, the feature values ​​in the first scanned image and the feature average values ​​in the preset image are compared and analyzed, and the smaller value is divided by the larger value to obtain the corresponding feature similarity value; Multiply the feature similarity value by the corresponding feature proportion weight coefficient, and then add them up to obtain a comprehensive first similarity value corresponding to the first scanned image and the preset image; The step of extracting features from a preset image and corresponding feature averages specifically includes: Extract feature values ​​from a preset image; Calculate the average value of the characteristic values ​​in the preset image to obtain a first average value; Calculate the difference between the first average value and the characteristic value in the preset image to obtain a first average difference; If the first average difference is greater than a preset first average difference threshold, deleting the feature value in the preset image corresponding to the first average difference; After the feature value in the preset image corresponding to the first average difference is deleted, the first average value is recalculated until the first average difference is less than or equal to the preset first average difference threshold; When all the first average difference values ​​are less than or equal to the preset first average difference threshold, the first average difference is set as the corresponding feature average value; The method for extracting the comprehensive second similarity value is as follows: after the high-pressure hydrogen storage tank is left to stand for a preset first time, it is scanned by a preset scanning device to obtain second scan image information, and then the second scan image and the preset image are compared and analyzed to obtain a comprehensive second similarity value; the calculation principle is the same as the calculation principle of the comprehensive first similarity value.

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