A vehicle-mounted hydrogen storage cylinder fire test system

Abstract

The present invention provides a vehicle-mounted hydrogen storage cylinder fire test system, comprising: a burner, used to provide a flame for cylinder testing, including M flame supply ports; a cylinder pressure sensor, used to detect the cylinder pressure P b ; The bottle temperature detection sensor is used to detect the bottle temperature Tb of the gas cylinder; the thermocouple temperature sensor is located below the burner and is used to detect the temperature Tf of the burner port i ; The infrared temperature measuring camera is used to take infrared images and detect the surface temperature Te of the gas cylinder based on the infrared images; when the controller detects that the time for the burner to provide flame reaches m*T, the data of the previous N sampling cycles is used to classify the surface temperature Te of the gas cylinder through the classifier function f(U) m To calculate the corresponding f(U) m , and based on the calculated f(U) m Corresponding prompt information is given according to the preset threshold, which can avoid accidents caused by the failure of the normal discharge pipeline due to the need to relieve pressure due to the over-high temperature in the bottle.

Description

Technical Field

[0001] The invention relates to a fire test system, in particular to a vehicle-mounted hydrogen storage cylinder fire test system. Background Art

[0002] With the rapid development of hydrogen fuel cell vehicle demonstration projects in my country, the safety of hydrogen fuel cell vehicles has become one of the keys to improving public acceptance. As an important component of hydrogen fuel cell vehicles, high-pressure hydrogen storage bottles store flammable and explosive high-pressure hydrogen and have flammable carbon fiber / resin winding layers. Their safety performance in accidents such as car fires has attracted much attention. In order to ensure the safety performance of high-pressure hydrogen storage bottles for vehicles in the event of fire, it is necessary to conduct fire tests on vehicle gas cylinders.

[0003] In the fire test, when the temperature inside the bottle has reached the required value of the fire test and the pressure inside the cylinder exceeds the action condition of the safety relief device, the on-board hydrogen storage cylinder needs to be depressurized to prevent the cylinder from exploding. The existing fire test system usually only releases pressure through the safety relief device of the bottle mouth combination valve of the on-board hydrogen storage cylinder. However, due to certain factors, such as damage to the gas source control valve causing a sharp rise in temperature, when the temperature inside the bottle has reached the required value of the fire test and the pressure inside the cylinder exceeds the action condition of the safety relief device, the safety relief device will not open normally. If the combustion continues, the cylinder will be in danger of explosion. Especially for composite hydrogen storage cylinders filled with hydrogen for fire tests, the risk of cylinder explosion is higher.

[0004] In order to avoid the harm caused by the failure to open the safety relief device when the temperature in the bottle is too high, a common solution is to set an abnormal relief pipeline in the bottle mouth combination valve of the on-board hydrogen storage cylinder. However, whether the existing abnormal relief pipeline needs to be opened is generally determined manually. This method of manual judgment requires testers to keep an eye on the fire scene and make corresponding judgments based on experience according to the fire test data to determine whether it needs to be opened. This method of relying on experience rather than relying on a single indicator or a composite indicator for judgment will greatly increase labor intensity.

[0005] Therefore, there is an urgent need to provide a monitoring solution that can automatically monitor the temperature and pressure of the vehicle-mounted hydrogen storage cylinder in real time during a fire test, and automatically prompt when the monitoring value reaches a certain condition and the safety release device is not opened. Summary of the invention

[0006] An embodiment of the present invention provides a vehicle-mounted hydrogen storage cylinder fire test system, which can monitor the flame temperature during the test, and the temperature and pressure inside and outside the vehicle-mounted hydrogen storage cylinder in real time, and when the test time reaches a certain value, automatically give corresponding prompts based on the monitored values ​​to avoid accidents caused by the failure of the normal discharge pipeline to be connected due to the excessive temperature inside the bottle.

[0007] The technical solution adopted by the present invention is:

[0008] The embodiment of the present invention provides a vehicle-mounted hydrogen storage cylinder fire test system, including: a controller, a burner, a cylinder pressure sensor, an internal temperature sensor, M thermocouple temperature sensors, an infrared temperature measurement camera and a display;

[0009] A burner, used to provide flame for the fire test of the on-board hydrogen storage cylinder, including A flame supply port;

[0010] The gas cylinder pressure sensor is used to detect the pressure P in the hydrogen storage cylinder. b ;

[0011] The internal temperature detection sensor is used to detect the internal temperature Tb of the vehicle-mounted hydrogen storage cylinder;

[0012] M thermocouple temperature sensors, located below the burner, are used to detect the temperature Tf of the burner port. i , the value of i ranges from 1 to M;

[0013] An infrared temperature measuring camera is used to capture an infrared image of the vehicle-mounted hydrogen storage cylinder and detect the surface temperature Te of the vehicle-mounted hydrogen storage cylinder based on the infrared image;

[0014] The controller is respectively connected to the burner, the gas cylinder pressure sensor, the bottle temperature sensor, M thermocouple temperature sensors, and the infrared temperature measurement camera for communication;

[0015] When the controller detects that the burner provides flame, it obtains (Tb, Tf, Te, Pb) every preset time period T, T f =avg(Tf i );

[0016] When the controller detects that the time for the burner to provide flame reaches m*T, the computer program is executed to implement the following steps:

[0017] S100, obtain U=(U m , U m-1 ,…,Ui,…,U m-N+1 ), U i =(T bi , T fi , T ei ,

[0018] P i ), is the (Tb, Tf, Te, Pb) obtained in the i-th preset time period T, the value of i is m to m-N+1, and N is the number of (Tb, Tf, Te, Pb) in U;

[0019] S210, if f(U) m >a, presenting the first prompt information on the display;

[0020] S220, if f(U) m ≤b, presenting the second prompt information on the display;

[0021] Wherein, a and b are the first threshold and the second threshold respectively, 0<b<a≤1;

[0022] f(U) m is the classifier function for classifying U.

[0023] The embodiment of the present invention provides a vehicle-mounted hydrogen storage cylinder fire test system. When it is detected that the burner provides flame, the flame temperature and the internal temperature, surface temperature and internal pressure of the cylinder are obtained every preset time period T, and when it is detected that the time for the burner to provide flame reaches a preset time m*T which is lower than the empirical value of the time for the burner to provide flame when the normal discharge pipeline is turned on, the data of the N sampling periods before m*T are used to classify the gas cylinder through the classifier function f(U). m To calculate the corresponding f(U) m , and based on the calculated f(U) m The system automatically gives corresponding prompt information according to the preset threshold, for example, prompt information on whether the gas cylinder needs to be depressurized, which can reduce labor intensity and improve monitoring efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The overall structure diagram of the vehicle-mounted hydrogen storage cylinder fire test system is shown;

[0025] Figure 2 is a structural schematic diagram of the support frame;

[0026] Figure 3 It is a schematic diagram of the structure of the overall burner;

[0027] Figure 4 It is a structural schematic diagram of a local burner;

[0028] Figure 5 It is a schematic diagram of the structure of the support frame on which the tube row burner is placed. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown, an embodiment of the present invention provides a vehicle-mounted hydrogen storage cylinder fire test system, including: a controller 9, a burner 2, a cylinder pressure sensor 32, an internal bottle temperature sensor (not shown), M thermocouple temperature sensors 28, an infrared temperature measurement camera 31, a normal discharge pipeline, an abnormal discharge pipeline and a display (not shown).

[0031] Among them, in the embodiment of the present invention, the burner 2 is used to provide a flame for the fire test of the vehicle-mounted hydrogen storage cylinder 6, and includes A flame supply ports. Specifically, the burner 2 can be a tube-row burner arranged on the support frame 1, and can include a local burner and an overall burner.

[0032] like Figure 2 As shown, the support frame 1 can be composed of a support platform 101 and multiple, for example, four gas cylinder support plates 102-105. The four gas cylinder support plates 102 are provided with multiple arc-shaped circular holes 103 for installing and fixing the tube-row burner 2.

[0033] The tube-row burner 2 is supported and arranged above the support frame 1, and can be formed into a downwardly concave arc structure to match the bottom contour of the vehicle-mounted hydrogen storage cylinder 6. The tube-row burner 2 may include an integral burner and two local burners. Figures 3 to 5 As shown, the integral burner may include a plurality of integral combustion tubes 201 arranged at intervals on a support frame 1 and an integral fuel intake pipe 202 connected to the plurality of integral combustion tubes; the local burner may include a plurality of local combustion tubes 203 arranged at intervals on a support frame and a local fuel intake pipe 204 connected to the plurality of local combustion tubes; the plurality of local combustion tubes and the plurality of integral combustion tubes are arranged in parallel, and each fuel tube is provided with a plurality of fire ports 205.

[0034] Specifically, Figure 5 As shown, one end of each integral combustion tube 201 is closed, and the other end is connected to the integral fuel intake pipe 202, for example, by welding. A plurality of fire ports 205 are formed on each integral combustion tube 201. Multiple integral combustion tubes 201 are arranged side by side on the support plates 102 to 105 along the length direction of the support frame 1, and each integral combustion tube is fixed to the support frame through the corresponding circular hole 103 in turn. The integral combustion tube is detachably fixed to the support frame, which is convenient for adjusting the flame position of the fire test. The integral fuel intake pipe 202 is connected to the combustion supply device through a pipeline to provide fuel to the integral combustion tube.

[0035] like Figure 4As shown, each local burner may include a plurality of local combustion tubes 203 arranged side by side and spaced apart and a local fuel inlet pipe 204 connected to the plurality of local combustion tubes 203, for example, by welding. Both ends of each local combustion tube 203 are closed and a plurality of flame supply ports 205 are formed to ensure that the flame is ejected only from the flame supply ports. Figure 5 As shown, one of the two local burners is located at the front end of the support frame, that is, it is arranged on the support plates 102 and 103, and is mainly used for local fire tests on vehicle-mounted hydrogen storage cylinders with safety discharge devices at both ends; the other local burner is arranged in the middle position of the support frame, that is, on the support plates 103 and 104, and is mainly used for local fire tests on vehicle-mounted hydrogen storage cylinders with a safety discharge device at only one end. In the present invention, by providing two local burners, the position switching of the local flame combustion of the vehicle-mounted hydrogen storage cylinder can be facilitated, the fire source control accuracy of the fire test is improved, and it can be applicable to the local fire test requirements of vehicle-mounted Type 3 and Type 4 gas cylinders with different numbers of safety discharge devices. Figure 5 It can be seen that each local combustion tube can be arranged between two adjacent integral combustion tubes, and the local combustion tubes are also fixed by corresponding circular holes 103. The number of the fire ports on the integral combustion tube and the fire ports on the local combustion tubes is A in total.

[0036] In the embodiment of the present invention, the number and size of the integral combustion tube and the local combustion tube can be determined according to the actual situation. Preferably, the tube-row burner can include 9 Integral combustion tube, 8 The local combustion tubes are spaced 100mm apart in the length direction of each combustion tube. The length of the local combustion tube can be set to 250±50mm to meet the standard requirements of the local fire test.

[0037] In the case of arranging 9 integral combustion tubes and 8 partial combustion tubes, the number of the circular holes 103 located on the support plates 102 to 104 may be 17, and the number of the circular holes located on the support plate 105 may be 9.

[0038] In the embodiment of the present invention, since the tube-bank burner includes both the overall burner and the local burner, the local fire test and the overall fire test can be performed simultaneously.

[0039] In addition, in the embodiment of the present invention, a flame isolation plate 3 may be provided between the burner and the vehicle-mounted hydrogen storage cylinder, and the flame isolation plate 3 may be detachably provided between the burner 2 and the vehicle-mounted hydrogen storage cylinder 6. The flame isolation plate 3 may be formed as an arc-shaped plate matching the bottom profile of the vehicle-mounted hydrogen storage cylinder 6, and is used to study the fire resistance of the vehicle-mounted gas cylinder when there is a metal protective baffle during actual use. The thickness of the flame isolation baffle 3 is less than or equal to 4 mm.

[0040] In the embodiment of the present invention, the burner 2 provides the required fuel for the test through the fuel supply device 4. In the embodiment of the present invention, the fuel supply device 4 is suitable for liquefied petroleum gas and natural gas as fuel sources, and is respectively connected to the overall fuel intake pipe 202 and the local fuel intake pipe 203 to provide the burner with a fuel source. Figure 1 As shown, the fuel supply device 4 may include multiple fuel supply bottles 401, a fuel source pipeline, an overall flow regulating pipeline and a local flow regulating pipeline. The multiple fuel supply bottles are connected to one end of the overall flow regulating pipeline and the local flow regulating pipeline arranged in the regulating valve box 402 through the fuel source pipeline, and the other ends of the overall flow regulating pipeline and the local flow regulating pipeline are connected to the overall fuel intake pipe and the local fuel intake pipe respectively; a main switch valve 403 is arranged on the fuel source pipeline, and an electric valve 404, a flow regulating valve 405 and a flow meter 406 connected in sequence are respectively arranged on the overall flow regulating pipeline and the local flow regulating pipeline. The electric valve 404 and the flow regulating valve 405 can be solenoid valves, and the flow of the flow regulating valve can be controlled by the remote valve control system 7. The flow meter is used to record the amount of fuel used in the fire test process, and the flow of the flow meter can be collected by the data acquisition device 8 and sent to the remote control end, i.e., the controller 9.

[0041] In addition, in the embodiment of the present invention, the fuel of the burner port can be ignited by the igniter 5. The igniter 5 can be arranged near any burner port of the local burner, and is used to perform an ignition operation under the control of the remote control terminal 9 to realize the flame ignition of the burner.

[0042] In the embodiment of the present invention, one end of the normal discharge circuit is connected to the discharge port of the safety discharge device of the bottle mouth combination valve of the vehicle-mounted hydrogen storage bottle, and the other end is connected to the discharge connection pipeline. One end of the abnormal discharge pipeline is connected to the air inlet of the bottle mouth combination valve of the vehicle-mounted hydrogen storage bottle, and the other end is connected to the discharge connection pipeline. The discharge connection pipeline is also connected to the safety discharge point, which is used to discharge the exhaust gas into the safety discharge point. Figure 1 As shown, a one-way valve 23 is provided on the normal discharge pipeline; an abnormal discharge valve 25 and a manual stop valve 26 are provided on the abnormal discharge pipeline; the abnormal discharge valve 25 is connected to the pipeline between the pressure-maintaining valve 22 and the air inlet of the bottle mouth combination valve. The one-way valve 23 and the manual stop valve 26 are respectively connected to the discharge connection pipeline, and a flame arrester 24 is provided on the discharge connection pipeline. Among them, the solenoid valve 14, the solenoid valve 18, the pressure-maintaining valve 22 and the abnormal discharge valve 25 are all connected to the valve control system 7, and the opening or closing operation is performed based on the control instruction of the valve control system 7. The valve control system 7 can be connected to the controller 9 for communication.

[0043] In the present invention, the function of the normal discharge pipeline is as follows: in the existing fire test system, the gas in the on-board hydrogen storage cylinder is directly discharged into a closed safety isolation device or environment. Since hydrogen may be used as the filling gas during the fire test of the hydrogen storage cylinder, when the hydrogen in the cylinder is discharged, the test fire source is still burning, and a jet fire may be formed at the bottle mouth, which not only increases the heating range of the cylinder and affects the accuracy of the test results, but also increases the safety hazards of the fire test site. The present invention sets a discharge pipeline, and the normal discharge pipeline is connected to the discharge port of the safety discharge device (TPRD) of the gas cylinder bottle mouth combination valve, so that the discharged hydrogen is discharged to a safe location far away from the test site. After a flame arrester is installed at the end of the discharge pipeline, the discharge is discharged to a safe location far away from the test site for recovery or emptying, which can ensure the accuracy of the test results and avoid safety hazards.

[0044] In the present invention, the function of the abnormal discharge pipeline is: during the fire test, when the temperature inside the bottle has reached the required value of the fire test, and the pressure inside the gas cylinder exceeds the action condition of the safety discharge device, if the safety discharge device is not opened normally, the gas cylinder will be in danger of explosion if the combustion continues. Especially for composite hydrogen storage cylinders filled with hydrogen for fire tests, the risk of gas cylinder explosion is higher. In order to protect the safety of the test equipment, test personnel and test sites, the present invention is provided with an abnormal discharge pipeline, which can remotely control the pressure relief bypass when the pressure in the gas cylinder is too high and the discharge device is abnormal, so as to discharge the gas in the gas cylinder and ensure the safety of the test.

[0045] In addition, in the embodiment of the present invention, a pressurized filling system may also be included. Figure 1 As shown, the boost filling system may include a boost filling connection pipeline, a nitrogen pipeline and a hydrogen boost filling pipeline; one end of the boost filling connection pipeline is connected to the abnormal discharge pipeline, and the other end is connected to the nitrogen pipeline and one end of the hydrogen source boost filling pipeline, and the other ends of the nitrogen pipeline and the hydrogen source boost filling pipeline are respectively connected to the nitrogen source 11 and the hydrogen source 15. Specifically, the nitrogen pipeline is provided with a filter 12, a manual stop valve 13, a solenoid valve 14 and a one-way valve 15 connected in sequence through pipelines. The nitrogen provided by the nitrogen source 11 flows into the boost filling connection pipeline through the filter 12, the manual stop valve 13, the solenoid valve 14 and the one-way valve 15 in sequence. The hydrogen source boost filling pipeline is provided with a filter 16, a boost pump front hand valve 17, a solenoid valve 18, a boost pump 19, a safety valve, a boost pump rear hand valve 20 and a one-way valve 21 connected in sequence through pipelines. The hydrogen provided by the hydrogen source 15 flows into the pressurized filling connection pipeline through the filter 16, the booster pump front hand valve 17, the solenoid valve 18, the booster pump 19, the safety valve, the booster pump rear hand valve 20 and the check valve 21. The booster filling connection pipeline is provided with a pressure-maintaining valve 22; the check valve 14 of the nitrogen pipeline and the check valve 21 of the hydrogen booster filling pipeline are respectively connected to the pressure-maintaining valve 22.

[0046] In the embodiment of the present invention, the function of the pressurized filling system is as follows: the existing fire test system requires the on-board hydrogen storage cylinder to be filled in advance and transported to the fire test bench with corresponding tooling for fixing. Since the filling medium of the on-board hydrogen storage cylinder of the composite material may be hydrogen, natural gas and other media, and the pressure is 35-70MPa, there are certain safety hazards during transportation. In the embodiment of the present invention, the pressurized filling system is connected to the air inlet of the bottle mouth combination valve of the on-board hydrogen storage cylinder to be tested through a pipeline, and hydrogen pressurized filling is performed before the fire test begins. At the same time, the gas cylinder and the pipeline can be tested for air tightness by switching to the nitrogen pipeline, and it can be controlled by a remote control terminal. Therefore, there is no need to fill the on-board hydrogen storage cylinder in advance, which can avoid safety hazards that may occur during transportation.

[0047] In the embodiment of the present invention, the gas cylinder pressure sensor 32 is used to detect the pressure P in the vehicle-mounted hydrogen storage cylinder 6. b , which is arranged on the abnormal discharge pipeline, specifically, on the pipeline between the abnormal discharge valve 25 and the gas inlet of the bottle mouth combination valve. In addition, in addition to the gas cylinder pressure sensor 32 being arranged between the abnormal discharge valve 25 and the gas inlet of the bottle mouth combination valve, pressure sensors ( Figure 1 The component indicated by the symbol P in the figure is used to measure the pressure of the gas in the pipeline during the fire test. Among them, pressure sensors are arranged at the following positions: between the one-way valve and the pressure-maintaining valve of the nitrogen pipeline, between the front hand valve and the solenoid valve of the booster pump of the hydrogen booster filling pipeline, between the one-way valve and the pressure-maintaining valve of the hydrogen source booster filling pipeline, and between the discharge port of the safety discharge device of the bottle mouth combination valve and the one-way valve on the normal discharge pipeline.

[0048] In the embodiment of the present invention, the bottle temperature detection sensor (not shown) is used to detect the bottle temperature Tb of the vehicle-mounted hydrogen storage bottle, and can be set on the normal discharge pipeline, specifically, it can be set near the bursting bead in the one-way valve 23 on the normal discharge pipeline. The bottle temperature detection sensor can be an existing temperature detection sensor, for example, a patch temperature detection sensor or a thermocouple temperature sensor.

[0049] M thermocouple temperature sensors 28 are distributed near A burner ports, specifically below the burner, to detect the temperature Tf of the burner ports. i , i ranges from 1 to M. Figure 3As shown, a plurality of fixing structures 29 for fixing thermocouples are provided on the support frame 1. For example, a fixing structure is provided every 100 mm to fix the thermocouple sensor to prevent the position of the thermocouple from changing during the fire test. In one example, the fixing structure may be a cylindrical tube welded to the support frame 1. In another example, the fixing structure 29 may be a clamp rotatably provided on the support frame 1. The fixing structure is used to fix one end of the thermocouple, and the other end of the thermocouple extends below the tube-row burner to measure the test temperature.

[0050] In an embodiment of the present invention, M≤A, preferably, M=A. In one embodiment, M<A. In this case, the number of thermocouples may be at least 5, of which at least 2 are set in the local fire area and at least 3 are set in the overall fire area. The spacing between the thermocouples and the distance from the lower surface of the hydrogen storage bottle can be set according to the empirical values ​​of the fire test. For example, the thermocouples are arranged at equal intervals, and the spacing is ≤0.5m, and the distance between the thermocouples and the lower surface of the gas cylinder is 25±10mm. In addition, to protect the thermocouples, a thermocouple protection structure 30 may be provided at one end of the protective thermocouple extending into the tube-row burner to prevent the thermocouple from being impacted by the flame during the fire test. The thermocouple protection structure may be an area less than or equal to 25mm 2 A square metal protection measuring block is provided, and the end of the thermocouple is embedded in the metal protection measuring block.

[0051] In the embodiment of the present invention, the infrared temperature measuring camera 31 is used to take an infrared image of the vehicle-mounted hydrogen storage cylinder 6 and detect the surface temperature Te of the vehicle-mounted hydrogen storage cylinder according to the infrared image. The existing technology can be used to detect the surface temperature of the vehicle-mounted hydrogen storage cylinder according to the infrared image.

[0052] In an embodiment of the present invention, the controller 9 can be a remote control terminal, which can be communicated with the burner 2, the gas cylinder pressure sensor 32, the temperature sensor inside the bottle, M thermocouple temperature sensors 28, and the infrared temperature measurement camera 31 through the data acquisition device 8.

[0053] When the controller 9 detects that the burner 2 provides flame, it obtains (Tb, Tf, Te, Pb) every preset time period T. f =avg(Tf i ).

[0054] When the controller detects that the time for the burner to provide flame reaches m*T, where m is a preset integer so that m*T is lower than the empirical value of the time for the burner to provide flame when the normal discharge pipeline is connected, the computer program is executed to implement the following steps:

[0055] S100, obtain U=(U m , U m-1 ,…,Ui,…,U m-N+1), U i =(T bi , T fi , T ei ,

[0056] P i ), is the (Tb, Tf, Te, Pb) obtained in the i-th preset time period T, the value of i is m~m-N+1, and N is the number of (Tb, Tf, Te, Pb) in U.

[0057] S210, if f(U) m >a, presenting the first prompt information on the display.

[0058] S220, if f(U) m ≤b, a second prompt message is presented on the display.

[0059] Wherein, a and b are the first threshold and the second threshold respectively, 0<b<a≤1;

[0060] f(U) m is the classifier function for classifying U.

[0061] In the embodiment of the present invention, the first prompt information and the second prompt information are different. For example, different words may be used as the first prompt information and the second prompt information, or different colors may be used as the first prompt information and the second prompt information.

[0062] In an embodiment of the present invention, when it is detected that the burner provides flame, the flame temperature and the internal temperature, surface temperature and internal pressure of the gas cylinder are obtained every preset time period T, and when it is detected that the time for the burner to provide flame reaches a preset time m*T which is lower than the empirical value of the time for the burner to provide flame when the normal discharge pipeline is turned on, the data of the N sampling periods before m*T are used to classify the gas cylinder through the classifier function f(U). m To calculate the corresponding f(U) m , and based on the calculated f(U) m The corresponding prompt information is automatically given according to the preset threshold, which can reduce labor intensity, improve monitoring efficiency, and avoid accidents caused by unexpected situations such as excessive temperature in the bottle body requiring pressure relief while the normal discharge pipeline is not connected.

[0063] (Example 1)

[0064] In this embodiment, k1 i , k2 i , k3 i , k4 i is the pre-training coefficient.

[0065] In this embodiment, k1 i , k2 i , k3 i , k4 i According to the user sample set (T b , T f , T e , Pb, t, A), where t is the time for the burner to provide flame; A is the state value, A=1 indicates that the abnormal discharge pipeline is open, and A=0 indicates that the abnormal discharge pipeline is closed. The user sample set includes K1 user sample data with A=1 and K2 user sample data with A=0, and K2 is greater than K1. The user sample set can be obtained by sampling according to a preset sampling period during the fire test, and the sample data of each sampling includes T b , T f , T e ,Pb,t,A.

[0066] k1 i , k2 i , k3 i , k4 i The specific steps are as follows:

[0067] Select K3 user sample data from K1 user sample data as the Nth positive sample training data;

[0068] Select user sample data located in N-1 sampling periods before each user sample data in K3 user sample data from K1 to K3 user sample data as the 1st to N-1th positive sample training data respectively;

[0069] Select K3 user sample data corresponding to t in K3 positive samples from K2 user sample data as the Nth negative sample training data;

[0070] Select user sample data located in N-1 sampling periods before each user sample data in K3 user sample data from K2-K3 user sample data as the 1st to N-1th negative sample training data respectively;

[0071] Substitute the first to Nth (i.e. N*K3) positive sample training data and negative sample training data obtained into the classifier function f(U) m Train in and get k1 i , k2 i , k3 i , k4 i .

[0072] In this embodiment, sampling data containing 4 indicators of N periods are used to calculate the classifier function value corresponding to m*T, that is, multi-period and multi-indicator data are used for intelligent simulation, so that the judgment result can be approximately equal to or better than human judgment based on experience, thereby greatly reducing labor intensity.

[0073] (Example 2)

[0074] In this embodiment, k1 i , k2 i , k3 i , k4 i is the pre-training coefficient, and k1 m ≥k1 m-1 ≥...≥k1 m-N+1 ;k2 m ≥k2 m-1 ≥...≥k2 m-N+1 ;k3 m ≥k3 m-1 ≥...≥k3 m-N+1 ;k4 m ≥k4 m-1 ≥...≥k4 m-N+1 .

[0075] In this embodiment, k1 i , k2 i , k3 i , k4 i According to the user sample set (T b , T f , T e , Pb, t, A), where t is the time for the burner to provide flame; A is the state value, A=1 indicates that the abnormal discharge pipeline is open, and A=0 indicates that the abnormal discharge pipeline is closed. The user sample set includes K1 user sample data with A=1 and K2 user sample data with A=0, and K2 is greater than K1. The user sample set can be obtained by sampling according to a preset sampling period during the fire test, and the sample data of each sampling includes T b , T f , T e ,Pb,t,A.

[0076] k1 i , k2 i , k3 i , k4 i The specific steps are as follows:

[0077] Select K3 user sample data from K1 user sample data as the Nth positive sample training data;

[0078] Select user sample data located in N-1 sampling periods before each user sample data in K3 user sample data from K1 to K3 user sample data as the 1st to N-1th positive sample training data respectively;

[0079] Select K3 user sample data corresponding to t in K3 positive samples from K2 user sample data as the Nth negative sample training data;

[0080] Select user sample data located in N-1 sampling periods before each user sample data in K3 user sample data from K2-K3 user sample data as the 1st to N-1th negative sample training data respectively;

[0081] According to the constraint k1 m ≥k1 m-1 ≥...≥k1 m-N+1 , k2 m ≥k2 m-1 ≥...≥k2 m-N+1 , k3 m ≥k3 m-1 ≥...≥k3 m-N+1 , k4 m ≥k4 m-1 ≥...≥k4 m-N+1 , substitute the first to Nth (i.e. N*K3) positive sample training data and negative sample training data into the classifier function f(U) m Train in and get k1 i , k2 i , k3 i , k4 i .

[0082] Compared with the above-mentioned embodiment, this embodiment sets the constraint condition k1 m ≥k1 m-1 ≥...≥k1 m-N+1 , k2 m ≥k2 m-1 ≥...≥k2 m-N+1 , k3 m ≥k3 m-1 ≥...≥k3 m-N+1 , k4 m ≥k4 m-1 ≥...≥k4 m-N+1 , so that the data closer to the current calculation cycle has a greater importance, and the judgment result is better than the previous embodiment.

[0083] (Example 3)

[0084] In this embodiment, k1, k2i , k3, k4 are pre-training coefficients; k2 m ≥k2 m-1 ≥...≥k2 m-N+1 .

[0085] In this embodiment, k1, k2 i , k3, k4 according to the user sample set (T b , T f , T e , Pb, t, A), where t is the time for the burner to provide flame; A is the state value, A=1 indicates that the abnormal discharge pipeline is open, and A=0 indicates that the abnormal discharge pipeline is closed. The user sample set includes K1 user sample data with A=1 and K2 user sample data with A=0, and K2 is greater than K1; the user sample set can be obtained by sampling according to a preset sampling period during the fire test, and the sample data of each sampling includes T b , T f , T e ,Pb,t,A.

[0086] k1, k2 i , k3, k4 are determined by the following steps:

[0087] Select K3 user sample data from K1 user sample data as the Nth positive sample training data;

[0088] Select user sample data located in N-1 sampling periods before each user sample data in K3 user sample data from K1-K3 user sample data to obtain (N-1)*K3 user sample data;

[0089] Extract T from the obtained (N-1)*K3 user sample data f , get (N-1)*K3 T f ;

[0090] The obtained (N-1)*K3 T f Respectively with (T b , T e , Pb,) are combined as the 1st to N-1th positive sample training data respectively;

[0091] Select K3 user sample data corresponding to t in K3 positive samples from K2 user sample data as the Nth negative sample data;

[0092] Select user sample data located in N-1 sampling periods before each user sample data in K3 user sample data from K2-K3 user sample data to obtain (N-1)*K3 user sample data;

[0093] Extract T from the obtained (N-1)*K3 user sample data f , get (N-1)*K3 T f ;

[0094] The obtained (N-1)*K3 T f Respectively with (T b , T e , Pb,) and the (N-1)*K3 data obtained by combining are used as the 1st to N-1th negative sample training data respectively;

[0095] According to the constraint k2 m ≥k2 m-1 ≥...≥k2 m-N+1 , the obtained 1st to Nth positive sample training data and negative sample training data (i.e., including K3 (T b , T e , Pb,) and N*K3 T f )Substitute into the classifier function f(U) m Train in and get k1, k2 i , k3, k4.

[0096] Compared with Embodiment 1, this embodiment only utilizes N cycles of T f , which simplifies the calculation process while ensuring the accuracy of the results. In addition, due to the setting of the constraint k2 m ≥k2 m-1 ≥...≥k2 m-N+1 , so that the closer to the current calculation cycle T f The greater the importance, the more accurate the judgment result can be.

[0097] In one embodiment of the present invention, the first threshold a=min(f(U) m 1 ,f(U) m 2 , ..., f(U) m K3 ), f(U) j The classification function value obtained by classifying the j-th positive sample among K3 positive samples, where the value of j ranges from 1 to K3.

[0098] In another embodiment of the present invention, the first threshold a=f(U) m j , where j / K3≤c, and f(U) m 1 ≤f(U) m 2, ..., ≤ f(U) m K3 ,f(U) j is the classification function value obtained by classifying the jth positive sample among K3 positive samples, where j ranges from 1 to K3, and c is a preset coefficient, for example, 0.01 to 0.05, preferably 0.01.

[0099] The first threshold a obtained in the above manner is as long as the classification function value f(U) obtained according to the acquired data U m ≥a, it indicates that the abnormal discharge pipeline needs to be opened, that is, the first prompt information is information for indicating the opening of the abnormal discharge pipeline.

[0100] In one embodiment of the present invention, the second threshold b=max(f(U) m 1 ,f(U) m 2 , ..., f(U) m K3 ), f(U) j The classification function value obtained by classifying the j-th negative sample among K3 negative samples, where the value of j ranges from 1 to K3.

[0101] In another embodiment of the present invention, the second threshold b=f(U) m j , where j / K3≤c, and f(U) m 1 ≥f(U) m 2 , ..., ≥ f(U) m K3 ,f(U) j The classification function value obtained by classifying the j-th negative sample among K3 negative samples, where the value of j ranges from 1 to K3.

[0102] The second threshold value b obtained in the above manner is as long as the classification function value f(U) obtained according to the acquired data U m ≤b, it means that there is no need to open the abnormal discharge pipeline, that is, the second prompt information is information used to indicate that the abnormal discharge pipeline is not opened.

[0103] Furthermore, in the embodiment of the present invention, it also includes:

[0104] S230, if b<f(U) m <a, execute step S240;

[0105] S240, presenting third prompt information on the display.

[0106] The third prompt information is information different from both the first prompt information and the second prompt information, for example, it may be information that does not require user processing.

[0107] Furthermore, in the embodiment of the present invention, an alarm (not shown) may be included, which is used to issue an alarm when the first prompt information is presented.

[0108] Furthermore, the on-board hydrogen storage cylinder fire test system provided by the embodiment of the present invention also includes a discharge device protective cover 31 arranged on the bottle mouth of the on-board hydrogen storage cylinder, which is used to ensure that the TPRD of the on-board hydrogen storage cylinder is not damaged by the flame, reduce excessive protection, and prevent the TPRD action lag caused by uneven temperature conduction from affecting the test results. In one example, the discharge device protective cover 31 can be a tubular structure with grooves on both sides, which can be connected to the bottle mouth on the one hand, and can facilitate pipeline connection on the other hand. In addition, the thickness of the discharge device protective cover 31 is less than or equal to 4 mm.

[0109] Furthermore, the vehicle-mounted hydrogen storage cylinder fire test system provided by the embodiment of the present invention further includes a wind shield (not shown), which is arranged on both sides of the fire support frame. The wind shield is set as a height-adjustable metal shield to adapt to cylinders of different diameters. The height of the wind shield is consistent with the height of the vehicle-mounted hydrogen storage cylinder, and the height and position of the wind shield can be adjusted according to the actual meteorological conditions of the test site.

[0110] The above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, it should be understood by those skilled in the art that any person familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or perform equivalent replacements on some of the technical features thereof; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A vehicle-mounted hydrogen storage cylinder fire test system, characterized in that: include: Controller, burner, gas cylinder pressure sensor, bottle temperature sensor, M thermocouple temperature sensors, infrared temperature measurement camera, normal discharge pipeline, abnormal discharge pipeline and display; A burner, used to provide flame for the fire test of the on-board hydrogen storage cylinder, including A flame supply port; The gas cylinder pressure sensor is used to detect the pressure P in the hydrogen storage cylinder. b ; The internal temperature detection sensor is used to detect the internal temperature Tb of the vehicle-mounted hydrogen storage cylinder; M thermocouple temperature sensors, located below the burner, are used to detect the temperature Tf of the burner port. i , the value of i ranges from 1 to M; An infrared temperature measuring camera is used to capture an infrared image of the vehicle-mounted hydrogen storage cylinder and detect the surface temperature Te of the vehicle-mounted hydrogen storage cylinder based on the infrared image; The controller is respectively connected to the burner, the gas cylinder pressure sensor, the temperature sensor inside the bottle, M thermocouple temperature sensors, and the infrared temperature measurement camera for communication; When the controller detects that the burner provides flame, it obtains (Tb, Tf, Te, Pb) every preset time period T, T f =avg(Tf i ); When the controller detects that the time for the burner to provide flame reaches m*T, the computer program is executed to implement the following steps: S100, obtain U=(U m , U m-1 ,…,Ui,…,U m-N+1 ), U i =(T bi , T fi , T ei , P i ), is the (Tb, Tf, Te, Pb) obtained in the i-th preset time period T, the value of i is m to m-N+1, and N is the number of (Tb, Tf, Te, Pb) in U; S210, if f(U) m >a, presenting the first prompt information on the display; S220, if f(U) m ≤b, presenting the second prompt information on the display; S230, if b<f(U) m <a, presenting the third prompt information on the display; Wherein, a and b are the first threshold and the second threshold, respectively, 0<b<a≤1; the first prompt information is information for indicating that the abnormal discharge pipeline is opened, the second prompt information is information for indicating that the abnormal discharge pipeline is not opened, and the third prompt information is information that does not require user processing; f(U) m is the classifier function for classifying U.

2. The vehicle-mounted hydrogen storage cylinder fire test system according to claim 1 is characterized in that: k1 i , k2 i , k3 i , k4 i For pre-trained coefficient.

3. The vehicle-mounted hydrogen storage cylinder fire test system according to claim 1 is characterized in that: k1, k2 i , k3, k4 are the pre-training coefficients; k2 m ≥k2 m-1 ≥...≥k2 m-N+1 。 4. The vehicle-mounted hydrogen storage cylinder fire test system according to claim 2 is characterized in that: k1 i , k2 i , k3 i , k4 i According to the user sample set (T b , T f , T e , Pb, t, A), where t is the time for the burner to provide flame; A is a state value, A=1 indicates that the abnormal discharge pipeline is open, and A=0 indicates that the abnormal discharge pipeline is closed, and the user sample set includes K1 user sample data with A=1 and K2 user sample data with A=0; k1 i , k2 i , k3 i , k4 i The specific steps are as follows: Select K3 user sample data from K1 user sample data as the Nth positive sample training data; Select user sample data located in N-1 sampling periods before each user sample data in K3 user sample data from K1 to K3 user sample data as the 1st to N-1th positive sample training data respectively; Select K3 user sample data corresponding to t in K3 positive samples from K2 user sample data as the Nth negative sample training data; Select user sample data located in N-1 sampling periods before each user sample data in K3 user sample data from K2-K3 user sample data as the 1st to N-1th negative sample training data respectively; Substitute the obtained 1st to Nth positive sample training data and negative sample training data into the classifier function f(U) m Train in and get k1 i , k2 i , k3 i , k4 i .

5. The vehicle-mounted hydrogen storage cylinder fire test system according to claim 3 is characterized in that: k1, k2 i , k3, k4 according to the user sample set (T b , T f , T e , Pb, t, A), where t is the time for the burner to provide flame; A is a state value, A=1 indicates that the abnormal discharge pipeline is open, and A=0 indicates that the abnormal discharge pipeline is closed, and the user sample set includes K1 user sample data with A=1 and K2 user sample data with A=0; k1, k2 i , k3, k4 are determined by the following steps: Select K3 user sample data from K1 user sample data as the Nth positive sample training data; Select user sample data located in N-1 sampling periods before each user sample data in K3 user sample data from K1-K3 user sample data to obtain (N-1)*K3 user sample data; Extract T from the obtained (N-1)*K3 user sample data f , get (N-1)*K3 T f ; The obtained (N-1)*K3 T f Respectively with (T b , T e , Pb,) are combined as the 1st to N-1th positive sample training data respectively; Select K3 user sample data corresponding to t in K3 positive samples from K2 user sample data as the Nth negative sample data; Select user sample data located in N-1 sampling periods before each user sample data in K3 user sample data from K2-K3 user sample data to obtain (N-1)*K3 user sample data; Extract T from the obtained (N-1)*K3 user sample data f , get (N-1)*K3 T f ; The obtained (N-1)*K3 T f Respectively with (T b , T e , Pb,) and the (N-1)*K3 data obtained by combining are used as the 1st to N-1th negative sample training data respectively; According to the constraint k2 m ≥k2 m-1 ≥...≥k2 m-N+1 , substitute the first to Nth positive sample training data and negative sample training data into the classifier function f(U) m Train in and get k1, k2 i , k3, k4.

6. The vehicle-mounted hydrogen storage cylinder fire test system according to claim 4 or 5, characterized in that: a=min(f(U) m 1 ,f(U) m 2 , ..., f(U) m K3 ), f(U) j is the classification function value obtained by classifying the jth positive sample among K3 positive samples, and the value of j ranges from 1 to K3; or Where j / K3≤c, and f(U) m 1 ≤f(U) m 2 , ..., ≤ f(U) m K3 ,f(U) j The classification function value obtained by classifying the j-th positive sample among K3 positive samples, where the value of j ranges from 1 to K3.

7. The vehicle-mounted hydrogen storage cylinder fire test system according to claim 4 or 5, characterized in that: b=max(f(U) m 1 ,f(U) m 2 , ..., f(U) m K3 ), f(U) j is the classification function value obtained by classifying the jth negative sample among K3 negative samples, and the value of j ranges from 1 to K3; or, Where j / K3≤c, and f(U) m 1 ≥f(U) m 2 , ..., ≥ f(U) m K3 ,f(U) j The classification function value obtained by classifying the j-th negative sample among K3 negative samples, where the value of j ranges from 1 to K3.

8. The vehicle-mounted hydrogen storage cylinder fire test system according to claim 4 or 5, characterized in that: The gas cylinder pressure sensor is arranged on the abnormal discharge pipeline.

9. The vehicle-mounted hydrogen storage cylinder fire test system according to claim 1, characterized in that: The bottle internal temperature detection sensor is arranged on the normal discharge pipeline.

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