A visual monitoring method and device for simulating hydrogen leakage in a vehicle-mounted hydrogen system

Abstract

The present application relates to the field of hydrogen leakage detection technology, and in particular to a visual monitoring method and device for simulating hydrogen leakage in a vehicle-mounted hydrogen system, wherein a hydrogen simulation input device is used to supply leaked hydrogen, and the leaked hydrogen is input into the interior of a hydrogen leakage concentration monitoring device; a hydrogen leakage concentration monitoring device is combined with the vehicle-mounted hydrogen system to be analyzed to construct a hydrogen leakage simulation scene, and leakage operating condition characteristics of hydrogen leakage are configured; the hydrogen leakage concentration monitoring device adopts a preset layout strategy to set up multiple hydrogen concentration sensors to monitor the hydrogen concentration at multiple specific locations; based on the time series monitoring results of the hydrogen concentration, the transient change curves of the hydrogen concentration of multiple hydrogen concentration sensors over time and the hydrogen concentration distribution matrix are calculated and drawn. The present invention can simulate the real scene analysis of different leakage conditions under the correlation relationship of hydrogen concentration changes, obtain the evolution characteristics of hydrogen leakage diffusion in space, and provide a reference for hydrogen leakage safety monitoring.

Description

Technical Field

[0001] The present application relates to the technical field of hydrogen leakage detection, and in particular to a visual monitoring method and device for simulating hydrogen leakage of an on-board hydrogen system. Background Art

[0002] The hydrogen safety evaluation of fuel cell vehicles is highly complex and challenging due to the influence of complex factors such as diverse application scenarios, variable operating conditions, unknown leakage points, and hydrogen-electric dual-source coupling. In particular, for the large-scale promotion and application of fuel cell vehicles in the future, key scenarios and safety indicators such as hydrogen leakage in closed garages and underground garages and hydrogen emissions during road driving have not been scientifically quantitatively evaluated. This situation has exacerbated the public's negative perception of the safety of fuel cell vehicles on the one hand, and on the other hand, it has seriously hindered the improvement of hydrogen safety and product promotion and application of fuel cell vehicles.

[0003] Invention patent CN113624405B proposes a hydrogen leakage and diffusion test device in a confined space, including a hydrogen leakage scene simulation system, a gas concentration measurement system and a high-speed schlieren shooting system. It can reflect the flow characteristics after gas release by shooting flow field density change images. However, this method is limited by the size of the framing area of ​​the schlieren shooting system and cannot meet the hydrogen leakage concentration test requirements of larger test objects such as on-board hydrogen systems or fuel cell vehicles.

[0004] Invention patent CN115688464A proposes a method and system for visualizing the safety boundary of hydrogen leakage, which uses the hydrogen concentration obtained by the hydrogen leakage experimental device and numerical simulation to perform data fusion to obtain the fused concentration, and further obtains the contour boundary of 4% hydrogen concentration. However, this method is based on the hydrogen leakage experimental device to obtain the hydrogen leakage grayscale image, and is also not applicable to the hydrogen leakage detection of larger test objects such as vehicle-mounted hydrogen systems or fuel cell vehicles. Therefore, it is urgent to establish a method and device for monitoring the spatial concentration of hydrogen leakage suitable for vehicle-mounted hydrogen systems and fuel cell vehicles. Summary of the invention

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] According to a first aspect of the present invention, the present invention claims a method for visually monitoring hydrogen leakage of a simulated vehicle-mounted hydrogen system, characterized in that it comprises:

[0007] A hydrogen simulation input device is used to supply leaked hydrogen, and the leaked hydrogen is input into the interior of the hydrogen leakage concentration monitoring device;

[0008] Combining the hydrogen leakage concentration monitoring device with the onboard hydrogen system to be analyzed to build a hydrogen leakage simulation scenario, and configuring the leakage condition characteristics of the hydrogen leakage;

[0009] The hydrogen leakage concentration monitoring device adopts a preset layout strategy to set up multiple hydrogen concentration sensors to monitor the hydrogen concentration at multiple specific locations;

[0010] Calculate and draw the transient change curves of hydrogen concentration over time and the hydrogen concentration distribution matrix of multiple hydrogen concentration sensors based on the time series monitoring results of hydrogen concentration;

[0011] According to the hydrogen concentration distribution matrix, a visual distribution diagram of hydrogen concentration is obtained by cyclically drawing.

[0012] Furthermore, the use of a hydrogen simulation input device to supply leaked hydrogen and input the leaked hydrogen into the interior of the hydrogen leakage concentration monitoring device also includes:

[0013] Using a hydrogen bottle to input leaked hydrogen into the internal supply of the hydrogen leakage concentration monitoring device;

[0014] Using a pressure reducing valve to adjust the pressure of the leaked hydrogen at the outlet of the hydrogen cylinder, and using a flow meter to monitor and control the flow of the leaked hydrogen at the outlet of the hydrogen cylinder;

[0015] A check valve is installed at the output end of the hydrogen simulation input device to quickly stop and start the hydrogen leakage test, thereby shortening the time required for hydrogen to be transported from the hydrogen cylinder to the leakage port;

[0016] The leakage port is fixed to the onboard hydrogen system to be analyzed, and the flow configuration of hydrogen leakage and the adjustment of leakage direction are performed inside the hydrogen leakage concentration monitoring device.

[0017] Furthermore, the hydrogen leakage concentration monitoring device is combined with the onboard hydrogen system to be analyzed to construct a hydrogen leakage simulation scenario, and the leakage condition characteristics of the hydrogen leakage are configured, and further includes:

[0018] Adjust the aperture, position, direction, number, hydrogen leakage flow rate, and hydrogen leakage pressure of the leakage port;

[0019] Simulate single point leakage, multiple point leakage or real scenarios under different leakage conditions.

[0020] Furthermore, the hydrogen leakage concentration monitoring device adopts a preset layout strategy to set up multiple hydrogen concentration sensors to monitor the hydrogen concentration at multiple specific locations, and also includes:

[0021] A plurality of hydrogen concentration sensors with different measuring ranges are installed at different positions of the hydrogen leakage concentration monitoring device to monitor the hydrogen concentration;

[0022] Real-time monitoring of multi-source data during hydrogen leakage concentration monitoring and recording of parameters, real-time display of working curve and historical curve query function controls.

[0023] Furthermore, the method of calculating and drawing the transient change curves of the hydrogen concentration over time and the hydrogen concentration distribution matrix of the multiple hydrogen concentration sensors based on the time series monitoring results of the hydrogen concentration also includes:

[0024] The ABUS bus communication is used to obtain the numerical information of the hydrogen concentration sensor in real time;

[0025] The output current analog signal of the hydrogen concentration sensor is converted into a digital signal, and the value of the hydrogen concentration sensor is calculated according to a normalization formula and the unit conversion is performed;

[0026] Obtaining the change of the hydrogen concentration value of the hydrogen concentration sensor at a specific position over time, and obtaining the change vector of the hydrogen concentration of the hydrogen concentration sensor in the order of time advancement;

[0027] According to the change vector of the hydrogen concentration of the hydrogen concentration sensor, the transient change curves of the hydrogen concentration of all hydrogen concentration sensors over time and the hydrogen concentration distribution matrix are drawn.

[0028] Furthermore, the method of cyclically drawing a visualized distribution diagram of hydrogen concentration based on the hydrogen concentration distribution matrix further includes:

[0029] Obtaining hydrogen concentration values ​​of all hydrogen concentration sensors, and analyzing to obtain a first hydrogen concentration matrix monitored at a first position at a first preset time;

[0030] Based on the first hydrogen concentration matrix, a first two-dimensional distribution cloud map is drawn to obtain a visualized distribution map of hydrogen concentration at a first position at a first preset time;

[0031] The process is repeated cyclically to obtain a visualization distribution diagram of the hydrogen concentration at the first position at all times.

[0032] According to the second aspect of the present invention, the present invention claims protection for a visual monitoring device for simulating hydrogen leakage of an on-board hydrogen system, which is used to perform a visual monitoring method for simulating hydrogen leakage of an on-board hydrogen system, characterized in that it comprises: a simulated hydrogen leakage module, an on-board hydrogen system, a hydrogen leakage concentration monitoring module, a hydrogen leakage concentration calculation module, and a two-dimensional visual analysis module for hydrogen concentration distribution;

[0033] The simulated hydrogen leakage module includes a hydrogen cylinder, a pressure reducing valve, a flow meter, a check valve, a metal pipe, and a leakage port;

[0034] The vehicle-mounted hydrogen system includes a hydrogen filling port, a one-way valve, a hydrogen storage cylinder, a cylinder port combination valve, a hydrogen pipeline, and a fixed frame, which are placed inside the hydrogen leakage concentration monitoring device and are used to build a scenario in which a hydrogen leakage occurs in the vehicle-mounted hydrogen system;

[0035] The hydrogen leakage concentration monitoring module includes a hydrogen concentration monitoring device, a lighting system, a monitoring system, and an operation control system;

[0036] The hydrogen concentration monitoring device includes a plurality of hydrogen concentration sensors;

[0037] The hydrogen leakage concentration calculation module obtains a transient change curve of hydrogen concentration over time and a hydrogen concentration distribution matrix based on the numerical information analysis of the hydrogen concentration sensor;

[0038] The two-dimensional visualization analysis module of hydrogen concentration distribution draws a visualization distribution diagram of hydrogen concentration based on the hydrogen concentration distribution matrix analysis of the hydrogen leakage concentration calculation module.

[0039] The present application relates to the field of hydrogen leakage detection technology, and in particular to a visual monitoring method and device for simulating hydrogen leakage in a vehicle-mounted hydrogen system, wherein a hydrogen simulation input device is used to supply leaked hydrogen, and the leaked hydrogen is input into the interior of a hydrogen leakage concentration monitoring device; a hydrogen leakage concentration monitoring device is combined with the vehicle-mounted hydrogen system to be analyzed to construct a hydrogen leakage simulation scene, and leakage operating condition characteristics of hydrogen leakage are configured; the hydrogen leakage concentration monitoring device adopts a preset layout strategy to set up multiple hydrogen concentration sensors to monitor the hydrogen concentration at multiple specific locations; based on the time series monitoring results of the hydrogen concentration, the transient change curves of the hydrogen concentration of multiple hydrogen concentration sensors over time and the hydrogen concentration distribution matrix are calculated and drawn. The present invention can simulate the real scene analysis of different leakage conditions under the correlation relationship of hydrogen concentration changes, obtain the evolution characteristics of hydrogen leakage diffusion in space, and provide a reference for hydrogen leakage safety monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A workflow diagram of a method for visually monitoring hydrogen leakage of a simulated vehicle-mounted hydrogen system as claimed in an embodiment of the present application;

[0041] Figure 2 A structural diagram of a visual monitoring device for simulating hydrogen leakage of an on-board hydrogen system as claimed in an embodiment of the present application;

[0042] Figure 3 A first distribution diagram of a hydrogen concentration sensor of a visual monitoring device for simulating hydrogen leakage of an on-board hydrogen system as claimed in an embodiment of the present application;

[0043] Figure 4A second distribution diagram of a hydrogen concentration sensor of a visual monitoring device for simulating hydrogen leakage of an on-board hydrogen system as claimed in an embodiment of the present application;

[0044] Figure 5 A third distribution diagram of a hydrogen concentration sensor of a visual monitoring device for simulating hydrogen leakage of an on-board hydrogen system as claimed in an embodiment of the present application;

[0045] Figure 6 A transient change curve of a first hydrogen concentration sensor of a method for visually monitoring hydrogen leakage of a simulated vehicle hydrogen system as claimed in an embodiment of the present application;

[0046] Figure 7 A transient change curve of a second hydrogen concentration sensor of a method for visually monitoring hydrogen leakage of a simulated vehicle hydrogen system as claimed in an embodiment of the present application;

[0047] Figure 8 A visualization distribution diagram of hydrogen concentration on the left wall at the first moment of a visualization monitoring method for simulating hydrogen leakage of an on-board hydrogen system as claimed in an embodiment of the present application. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] The terms "first", "second" and "third" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" and "third" can explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of this application are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0050] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] According to the first embodiment of the present invention, the present invention claims a method for visually monitoring hydrogen leakage of a simulated vehicle hydrogen system, referring to Figure 1 ,include:

[0052] A hydrogen simulation input device is used to supply leaked hydrogen, and the leaked hydrogen is input into the interior of the hydrogen leakage concentration monitoring device;

[0053] Combining the hydrogen leakage concentration monitoring device with the onboard hydrogen system to be analyzed to build a hydrogen leakage simulation scenario, and configuring the leakage condition characteristics of the hydrogen leakage;

[0054] The hydrogen leakage concentration monitoring device adopts a preset layout strategy to set up multiple hydrogen concentration sensors to monitor the hydrogen concentration at multiple specific locations;

[0055] Calculate and draw the transient change curves of hydrogen concentration over time and the hydrogen concentration distribution matrix of multiple hydrogen concentration sensors based on the time series monitoring results of hydrogen concentration;

[0056] According to the hydrogen concentration distribution matrix, a visual distribution diagram of hydrogen concentration is obtained by cyclically drawing.

[0057] Furthermore, the use of a hydrogen simulation input device to supply leaked hydrogen and input the leaked hydrogen into the interior of the hydrogen leakage concentration monitoring device also includes:

[0058] Using a hydrogen bottle to input leaked hydrogen into the internal supply of the hydrogen leakage concentration monitoring device;

[0059] Using a pressure reducing valve to adjust the pressure of the leaked hydrogen at the outlet of the hydrogen cylinder, and using a flow meter to monitor and control the flow of the leaked hydrogen at the outlet of the hydrogen cylinder;

[0060] A check valve is installed at the output end of the hydrogen simulation input device to quickly stop and start the hydrogen leakage test, thereby shortening the time required for hydrogen to be transported from the hydrogen cylinder to the leakage port;

[0061] The leakage port is fixed to the onboard hydrogen system to be analyzed, and the flow configuration of hydrogen leakage and the adjustment of leakage direction are performed inside the hydrogen leakage concentration monitoring device.

[0062] Furthermore, the hydrogen leakage concentration monitoring device is combined with the onboard hydrogen system to be analyzed to construct a hydrogen leakage simulation scenario, and the leakage condition characteristics of the hydrogen leakage are configured, and further includes:

[0063] Adjust the aperture, position, direction, number, hydrogen leakage flow rate, and hydrogen leakage pressure of the leakage port;

[0064] Simulate single point leakage, multiple point leakage or real scenarios under different leakage conditions.

[0065] Furthermore, the hydrogen leakage concentration monitoring device adopts a preset layout strategy to set up multiple hydrogen concentration sensors to monitor the hydrogen concentration at multiple specific locations, and also includes:

[0066] A plurality of hydrogen concentration sensors with different measuring ranges are installed at different positions of the hydrogen leakage concentration monitoring device to monitor the hydrogen concentration;

[0067] Real-time monitoring of multi-source data during hydrogen leakage concentration monitoring and recording of parameters, real-time display of working curve and historical curve query function controls.

[0068] Furthermore, the method of calculating and drawing the transient change curves of the hydrogen concentration over time and the hydrogen concentration distribution matrix of the multiple hydrogen concentration sensors based on the time series monitoring results of the hydrogen concentration also includes:

[0069] The ABUS bus communication is used to obtain the numerical information of the hydrogen concentration sensor in real time;

[0070] The output current analog signal of the hydrogen concentration sensor is converted into a digital signal, and the value of the hydrogen concentration sensor is calculated according to a normalization formula and the unit conversion is performed;

[0071] Obtaining the change of the hydrogen concentration value of the hydrogen concentration sensor at a specific position over time, and obtaining the change vector of the hydrogen concentration of the hydrogen concentration sensor in the order of time advancement;

[0072] According to the change vector of the hydrogen concentration of the hydrogen concentration sensor, the transient change curves of the hydrogen concentration of all hydrogen concentration sensors over time and the hydrogen concentration distribution matrix are drawn.

[0073] In this embodiment, the value of the sensor is calculated according to formula (1), and the unit is converted into ppm.

[0074] (1);

[0075] in Indicates the actual concentration measured by the hydrogen concentration sensor. Indicates the maximum concentration that the sensor can measure. is the minimum concentration that the sensor can measure, is the maximum current output by the sensor, is the minimum current output by the sensor, It is the current value measured by the AD conversion module.

[0076] The hydrogen concentration value measured by the hydrogen concentration sensor can be obtained based on the current value output by the AD conversion module.

[0077] Obtain the change of the hydrogen concentration value of the hydrogen concentration sensor at a specific position over time, and obtain the change of the hydrogen concentration of the hydrogen concentration sensor in the order of time advancement (taking the hydrogen concentration sensor M1 as an example), which is recorded as:

[0078] (2);

[0079] in represents the total hydrogen concentration vector of the hydrogen concentration sensor M1, Indicates the hydrogen concentration value of the hydrogen concentration sensor M1 from t1, t2 to tn;

[0080] Based on the total hydrogen concentration vector of the hydrogen concentration sensor M1, a transient change curve of the hydrogen concentration of the hydrogen concentration sensor M1 over time is plotted with time as the horizontal axis and the hydrogen concentration value as the vertical axis;

[0081] Referring to the previous steps, the transient change curves of the hydrogen concentration of all hydrogen concentration sensors over time are plotted to obtain the change of the hydrogen concentration inside the hydrogen leakage concentration monitoring device over time.

[0082] Furthermore, the method of cyclically drawing a visualized distribution diagram of hydrogen concentration based on the hydrogen concentration distribution matrix further includes:

[0083] Obtaining hydrogen concentration values ​​of all hydrogen concentration sensors, and analyzing to obtain a first hydrogen concentration matrix monitored at a first position at a first preset time;

[0084] Based on the first hydrogen concentration matrix, a first two-dimensional distribution cloud map is drawn to obtain a visualized distribution map of hydrogen concentration at a first position at a first preset time;

[0085] The process is repeated cyclically to obtain a visualization distribution diagram of the hydrogen concentration at the first position at all times.

[0086] In this embodiment, the hydrogen concentration values ​​of all hydrogen concentration sensors in the hydrogen concentration monitoring device are obtained (for example, the hydrogen concentration values ​​of the left wall of the hydrogen leakage concentration monitoring device are 9 hydrogen concentration sensors at time t1, respectively). to );

[0087] Based on the hydrogen concentration values ​​of all hydrogen concentration sensors, the hydrogen concentration matrix monitored by the left wall of the hydrogen leakage concentration monitoring device at time t1 is obtained. , recorded as:

[0088] (3);

[0089] Based on the hydrogen concentration matrix , is expanded into the extended hydrogen concentration matrix through bilinear interpolation, recorded as:

[0090] (4)

[0091] Based on the extended hydrogen concentration matrix , draw a two-dimensional distribution cloud map to obtain the visual distribution of hydrogen concentration on the left wall of the hydrogen leakage concentration monitoring device at time t1;

[0092] Repeat to obtain the visualized distribution of hydrogen concentration on the left wall at times t1, t2, and up to tn.

[0093] As described above, this embodiment arranges the hydrogen concentration monitoring devices located at the upper, middle and bottom parts on the left wall, right wall and top wall of the hydrogen leakage concentration monitoring device, and can analyze the correlation between the changes in the hydrogen concentration in each hydrogen concentration sensor, obtain the evolution characteristics of the hydrogen leakage diffusion in the space, and provide a reference for the safety monitoring of hydrogen leakage. It can realize the real-time hydrogen leakage concentration monitoring of the characteristic spatial points when the on-board hydrogen system of the fuel cell vehicle leaks, and can realize the two-dimensional visualization display of the hydrogen concentration distribution at high, medium and low positions; simulate the real scene of hydrogen leakage at a specific position of the on-board hydrogen system; and the aperture, position, direction, number of the leakage port, as well as the hydrogen leakage flow rate and hydrogen leakage pressure can be adjusted, so as to simulate the real scenes of single-point leakage, multiple-point leakage and different leakage conditions of the on-board hydrogen system of the fuel cell vehicle.

[0094] According to the second embodiment of the present invention, the present invention claims a visual monitoring device for simulating hydrogen leakage of a vehicle-mounted hydrogen system, which is used to perform the visual monitoring method for simulating hydrogen leakage of a vehicle-mounted hydrogen system, referring to Figure 2 , including: hydrogen cylinder, pressure reducing valve, flow meter, check valve, metal pipe, hydrogen leak port, vehicle-mounted hydrogen system, hydrogen concentration monitoring device, hydrogen concentration sensor;

[0095] In addition, the visual monitoring device for simulating hydrogen leakage of an on-board hydrogen system can also be described as consisting of a simulated hydrogen leakage module, an on-board hydrogen system, a hydrogen leakage concentration monitoring module, a hydrogen leakage concentration calculation module, and a two-dimensional visual analysis module for hydrogen concentration distribution;

[0096] The hydrogen cylinder, pressure reducing valve, flow meter, check valve, metal pipe, and hydrogen leakage port constitute a simulated hydrogen leakage module;

[0097] The vehicle-mounted hydrogen system includes a hydrogen filling port, a one-way valve, a hydrogen storage cylinder, a cylinder port combination valve, a hydrogen pipeline, and a fixed frame, which are placed inside the hydrogen leakage concentration monitoring device and are used to build a scenario in which a hydrogen leakage occurs in the vehicle-mounted hydrogen system;

[0098] The hydrogen leakage concentration monitoring module includes a hydrogen concentration monitoring device, a lighting system, a monitoring system, and an operation control system;

[0099] The hydrogen concentration monitoring device includes a plurality of hydrogen concentration sensors;

[0100] The hydrogen leakage concentration calculation module obtains a transient change curve of hydrogen concentration over time and a hydrogen concentration distribution matrix based on the numerical information analysis of the hydrogen concentration sensor;

[0101] The two-dimensional visualization analysis module of hydrogen concentration distribution draws a visualization distribution diagram of hydrogen concentration based on the hydrogen concentration distribution matrix analysis of the hydrogen leakage concentration calculation module.

[0102] Furthermore, the device also includes:

[0103] The external circulation module uses a silent centrifugal fan, which enters the cabin air duct after primary and high-efficiency filtration and dust removal treatment;

[0104] The internal circulation module uses an explosion-proof motor to adjust the circulation wind speed inside the hydrogen leakage concentration monitoring device;

[0105] The lighting system uses explosion-proof LED lamps;

[0106] The monitoring system uses explosion-proof cameras;

[0107] The operation control system displays and sets the cabin parameters through software.

[0108] Among them, in this embodiment, the lighting system is 4 explosion-proof LED lights, and 2 explosion-proof cameras are installed in the cabin as a monitoring system. The external circulation module uses a silent centrifugal fan, which enters the cabin air duct after primary and high-efficiency filtration and dust removal treatment and is equipped with a frequency converter; the internal circulation module uses an explosion-proof motor with a speed-regulating frequency converter, which can finely adjust the circulation wind speed to make the temperature more uniform.

[0109] The following is an explanation with practical application examples:

[0110] The hydrogen concentration sensors are arranged on the left wall, right wall and top wall of the hydrogen leakage concentration monitoring device;

[0111] Reference Figure 3 The left wall includes hydrogen concentration sensors A1, A2_L, A3, A4_L, A5, A6_L, A7, A8, A9, A10, A11, A12, wherein the measurement range of hydrogen concentration sensors A1, A3, A5, A7, A8, A9, A10, A11, A12 is 0~2000ppm, and the measurement range of hydrogen concentration sensors A2_L, A4_L, A6_L is 0~4%VOL; hydrogen concentration sensors A1, A3, A5, A7, A8, A9, A10, A11, A12 are arranged at high, middle and low positions of the left wall in an array manner, and hydrogen concentration sensors A2_L, A4_L, A6_L are arranged at a high position of the left wall;

[0112] Reference Figure 4 The right wall includes hydrogen concentration sensors C1, C2_L, C3, C4_L, C5, C6_L, C7, C8, C9, C10, C11, and C12, wherein the measurement range of the hydrogen concentration sensors C1, C3, C5, C7, C8, C9, C10, C11, and C12 is 0~2000ppm, and the measurement range of the hydrogen concentration sensors C2_L, C4_L, and C6_L is 0~4%VOL; the hydrogen concentration sensors C1, C3, C5, C7, C8, C9, C10, C11, and C12 are arranged at high, middle, and low positions of the right wall in an array manner, and the hydrogen concentration sensors C2_L, C4_L, and C6_L are arranged at a high position of the right wall;

[0113] Reference Figure 5 The top wall includes hydrogen concentration sensors B1 and B2_L, wherein the measurement range of the hydrogen concentration sensor B1 is 0~2000ppm, and the measurement range of the hydrogen concentration sensor B2_L is 0~4%VOL; the hydrogen concentration sensors B1 and B2_L are arranged at the center of the top wall;

[0114] The hydrogen cylinder is used to supply the leaked hydrogen inside the hydrogen leakage concentration monitoring device. A 53L single gas cylinder group with a rated working pressure of 35MPa is selected;

[0115] The pressure reducing valve is used to adjust the pressure of high-pressure hydrogen at the outlet of the hydrogen cylinder. GFI pressure reducing valve is selected;

[0116] The flow meter is used to monitor and control the hydrogen leakage flow rate. A Bronkhost flow meter with a full scale of 250 standard liters per minute is selected.

[0117] The check valve is installed before the metal pipe enters the hydrogen leakage concentration monitoring device to achieve the rapid stop and start of the hydrogen leakage test and shorten the time required for hydrogen to be transported from the hydrogen cylinder to the leakage port;

[0118] The leakage port is fixed to the vehicle-mounted hydrogen system and is used to realize hydrogen leakage with set flow rate and leakage direction inside the hydrogen leakage concentration monitoring device;

[0119] The hydrogen leakage port uses a circular leakage hole with a diameter of 0.5 mm. The hydrogen leakage port is arranged in the center area of ​​hydrogen concentration sensors A7, A8, A10, and A11, and the leakage direction is perpendicular to the left wall of the hydrogen leakage concentration monitoring device; the hydrogen leakage flow rate is selected to be 80 standard liters per minute, and the hydrogen leakage pressure is 0.8 MPa;

[0120] The hydrogen concentration monitoring device includes M hydrogen concentration sensors, including N 0~2000ppm range sensors (arranged on the left wall, right wall and top wall of the hydrogen leakage concentration monitoring device), and L 0~4% VOL range sensors (arranged on the upper part of the left wall and the upper part of the right wall);

[0121] The internal dimensions of the hydrogen leakage concentration monitoring device are 5.2m in length, 2.7m in width, and 2.0m in height. The outer wall material is 1mm thick cold-rolled steel plate electrostatically sprayed, the inner wall material is 1.5mm SUS304 mirror stainless steel, the insulation material is 100mm thick polyurethane foam, the sealing material is imported silicone rubber and polytetrafluoroethylene, and seamless welding is selected for processing and manufacturing;

[0122] Taking hydrogen concentration sensor A2_L as an example, the timing starts from the time when the simulated hydrogen leakage module is turned on, and the data recording interval is 0.1s. The change of hydrogen concentration of hydrogen concentration sensor A2_L is:

[0123]

[0124] Reference Figure 6-7 , based on the total hydrogen concentration vector of the hydrogen concentration sensor A2_L, with time as the horizontal axis and the hydrogen concentration value as the vertical axis, a transient change curve of the hydrogen concentration of the hydrogen concentration sensor A2_L over time is plotted;

[0125] Transient change curve of hydrogen concentration over time of hydrogen concentration sensors A4_L, A7, and B2_L;

[0126] Similarly, the transient change curves of the hydrogen concentration of the hydrogen concentration sensors A4_L, A7, and B2_L over time are obtained.

[0127] Obtain the hydrogen concentration values ​​of all hydrogen concentration sensors in the hydrogen concentration monitoring device (for example, the hydrogen concentration values ​​of the 9 hydrogen concentration sensors on the left wall of the hydrogen leakage concentration monitoring device at time t1 are to );

[0128] Based on the hydrogen concentration values ​​of all hydrogen concentration sensors, the hydrogen concentration matrix monitored by the left wall of the hydrogen leakage concentration monitoring device at time t1 is obtained. , recorded as:

[0129] ;

[0130] Based on the left wall hydrogen concentration sensors A2_L, A4_L, A6_L, A7, A8, A9, A10, A11, A12 of the hydrogen leakage concentration monitoring device, a hydrogen concentration matrix monitored on the left wall is formed. , recorded as:

[0131]

[0132] For example, the hydrogen concentration matrix monitored on the left wall at t=0.1s for

[0133]

[0134] Reference Figure 8 , the hydrogen concentration matrix monitored on the left wall at t=20s for

[0135]

[0136] The hydrogen concentration matrix monitored on the left wall at t=40s for

[0137]

[0138] The hydrogen concentration matrix monitored on the left wall at t=100s for

[0139]

[0140] Based on the hydrogen concentration matrix , is expanded into the extended hydrogen concentration matrix through bilinear interpolation, recorded as:

[0141]

[0142] Based on the extended hydrogen concentration matrix , draw a two-dimensional distribution cloud map to obtain the visual distribution of hydrogen concentration on the left wall of the hydrogen leakage concentration monitoring device at time t1;

[0143] In this embodiment, the two-dimensional distribution cloud map is drawn using the pcolor drawing command in matlab or the heat map drawing command in origin.

[0144] Repeat the calculation to obtain the visualized distribution of hydrogen concentration on the left wall at times t1, t2, and up to tn.

[0145] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0146] In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of software functional units. The above is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of this application, or directly or indirectly used in other related technical fields, is also included in the patent protection scope of the present application.

[0147] The specific implementation methods of the invention are described in detail above, but they are only examples, and the present application is not limited to the specific implementation methods described above. For those skilled in the art, any equivalent modification or substitution of the invention is also within the scope of the present application, and therefore, the equalization, modification, and improvement made without departing from the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A visual monitoring method for simulating hydrogen leakage in a vehicle-mounted hydrogen system, characterized in that: include: A hydrogen simulation input device is used to supply leaked hydrogen, and the leaked hydrogen is input into the interior of the hydrogen leakage concentration monitoring device; Combining the hydrogen leakage concentration monitoring device with the onboard hydrogen system to be analyzed to build a hydrogen leakage simulation scenario, and configuring the leakage condition characteristics of the hydrogen leakage; The hydrogen leakage concentration monitoring device adopts a preset layout strategy to set up multiple hydrogen concentration sensors to monitor the hydrogen concentration at multiple specific locations; Calculate and draw the transient change curves of hydrogen concentration over time and the hydrogen concentration distribution matrix of multiple hydrogen concentration sensors based on the time series monitoring results of hydrogen concentration; According to the hydrogen concentration distribution matrix, a visual distribution diagram of hydrogen concentration is obtained by cyclically drawing; The method further comprises: using a hydrogen simulation input device to supply leaked hydrogen and inputting the leaked hydrogen into the interior of the hydrogen leakage concentration monitoring device; Using a hydrogen bottle to input leaked hydrogen into the internal supply of the hydrogen leakage concentration monitoring device; Using a pressure reducing valve to adjust the pressure of the leaked hydrogen at the outlet of the hydrogen cylinder, and using a flow meter to monitor and control the flow of the leaked hydrogen at the outlet of the hydrogen cylinder; A check valve is installed at the output end of the hydrogen simulation input device to quickly stop and start the hydrogen leakage test, thereby shortening the time required for hydrogen to be transported from the hydrogen cylinder to the leakage port; The leakage port is fixed to the onboard hydrogen system to be analyzed, and the flow configuration of hydrogen leakage and the adjustment of leakage direction are performed inside the hydrogen leakage concentration monitoring device.

2. A visual monitoring method for simulating hydrogen leakage of a vehicle-mounted hydrogen system according to claim 1, characterized in that: The hydrogen leakage concentration monitoring device is combined with the on-board hydrogen system to be analyzed to build a hydrogen leakage simulation scenario, and the leakage condition characteristics of the hydrogen leakage are configured, and further includes: Adjust the aperture, position, direction, number, hydrogen leakage flow rate, and hydrogen leakage pressure of the leakage port; Simulate single point leakage, multiple point leakage or real scenarios under different leakage conditions.

3. A visual monitoring method for simulating hydrogen leakage of a vehicle-mounted hydrogen system as claimed in claim 2, characterized in that: The hydrogen leakage concentration monitoring device adopts a preset layout strategy to set up multiple hydrogen concentration sensors to monitor the hydrogen concentration at multiple specific locations, and also includes: A plurality of hydrogen concentration sensors with different measuring ranges are installed at different positions of the hydrogen leakage concentration monitoring device to monitor the hydrogen concentration; Real-time monitoring of multi-source data during hydrogen leakage concentration monitoring and recording of parameters, real-time display of working curve and historical curve query function controls.

4. A visual monitoring method for simulating hydrogen leakage of a vehicle-mounted hydrogen system as claimed in claim 3, characterized in that: The method of calculating and drawing the transient change curves of the hydrogen concentration over time of the multiple hydrogen concentration sensors and the hydrogen concentration distribution matrix according to the time series monitoring results of the hydrogen concentration also includes: The ABUS bus communication is used to obtain the numerical information of the hydrogen concentration sensor in real time; The output current analog signal of the hydrogen concentration sensor is converted into a digital signal, and the value of the hydrogen concentration sensor is calculated according to a normalization formula and the unit conversion is performed; Obtaining the change of the hydrogen concentration value of the hydrogen concentration sensor at a specific position over time, and obtaining the change vector of the hydrogen concentration of the hydrogen concentration sensor in the order of time advancement; According to the change vector of the hydrogen concentration of the hydrogen concentration sensor, the transient change curves of the hydrogen concentration of all hydrogen concentration sensors over time and the hydrogen concentration distribution matrix are drawn.

5. A visual monitoring method for simulating hydrogen leakage of a vehicle-mounted hydrogen system as claimed in claim 4, characterized in that: The method of cyclically drawing a visual distribution diagram of hydrogen concentration based on the hydrogen concentration distribution matrix further includes: Obtaining hydrogen concentration values ​​of all hydrogen concentration sensors, and analyzing to obtain a first hydrogen concentration matrix monitored at a first position at a first preset time; Based on the first hydrogen concentration matrix, a first two-dimensional distribution cloud map is drawn to obtain a visualized distribution map of hydrogen concentration at a first position at a first preset time; The process is repeated cyclically to obtain a visualization distribution diagram of the hydrogen concentration at the first position at all times.

6. A visual monitoring device for simulating hydrogen leakage of a vehicle-mounted hydrogen system, used to execute a visual monitoring method for simulating hydrogen leakage of a vehicle-mounted hydrogen system as claimed in any one of claims 1 to 5, characterized in that: include: Hydrogen leakage simulation module, vehicle-mounted hydrogen system, hydrogen leakage concentration monitoring module, hydrogen leakage concentration calculation module, and two-dimensional visualization analysis module of hydrogen concentration distribution; The simulated hydrogen leakage module includes a hydrogen cylinder, a pressure reducing valve, a flow meter, a check valve, a metal pipe, and a leakage port; The vehicle-mounted hydrogen system includes a hydrogen filling port, a one-way valve, a hydrogen storage cylinder, a cylinder port combination valve, a hydrogen pipeline, and a fixed frame, which are placed inside the hydrogen leakage concentration monitoring device and are used to build a scenario in which a hydrogen leakage occurs in the vehicle-mounted hydrogen system; The hydrogen leakage concentration monitoring module includes a hydrogen concentration monitoring device, a lighting system, a monitoring system, and an operation control system; The hydrogen concentration monitoring device includes a plurality of hydrogen concentration sensors; The hydrogen leakage concentration calculation module obtains a transient change curve of hydrogen concentration over time and a hydrogen concentration distribution matrix based on the numerical information analysis of the hydrogen concentration sensor; The two-dimensional visualization analysis module of hydrogen concentration distribution draws a visualization distribution diagram of hydrogen concentration based on the hydrogen concentration distribution matrix analysis of the hydrogen leakage concentration calculation module.

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