Fuel filling safety detection system applied to hydrogen fuel cell vehicle

Abstract

The invention discloses a fuel filling safety detection system applied to a hydrogen fuel cell vehicle, relates to the technical field of fuel filling safety detection, and solves the technical problem that in the prior art, interface sealing monitoring mostly depends on post-event leakage detection, and potential hazards are difficult to identify in real time in the plugging and locking stages of a filling gun. A stress distribution monitoring unit realizes accurate quantification of an interface state and leakage grading early warning, a vehicle situation sensing unit fills up a non-horizontal attitude detection blank, a displacement influence early warning unit dynamically avoids a vehicle movement risk, and an early warning system is established for the whole-scene and whole-process refueling safety detection system for the whole-scene and whole-process refueling safety detection system for the whole-scene and whole-process refueling safety detection system. An environment detection unit is added to solve the problem of diffusion management and control under multi-machine interference; each unit takes real-time data acquisition, quantitative analysis, dynamic regulation and control and closed-loop optimization as core logic, so that the single-point and afterward limitation of the traditional detection technology is broken through, and the balance between safety and efficiency is realized through data linkage and hierarchical management and control.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of fuel filling safety detection, in particular to a fuel filling safety detection system applied to a hydrogen fuel cell vehicle. BACKGROUND

[0002] Currently, hydrogen fuel cell vehicles gradually enter the commercial application stage, and the safety of the fuel filling link is one of the core bottlenecks restricting the large-scale promotion thereof; a patent with the application number 202211634746.9 discloses a filling pipe connection state detection device and detection system, which utilizes the electromagnetic induction principle, when the filling pipe with the electric conduction capacity simultaneously passes through the induction current generating mechanism and the current detection mechanism and forms a closed loop, the data processing system makes the filling pipe generate an induced current through the induction current generating mechanism, the induced current causes the magnetic field of the current detection mechanism to change, thereby generating another induced current and feeding back to the data processing system; if the filling pipe is disconnected, the closed loop is damaged, and the induced current disappears immediately. The current detection mechanism detects whether the induced current exists on the filling pipe, so as to judge the connection state of the filling pipe.

[0003] The existing filling safety detection technology has many limitations:

[0004] Firstly, the interface sealing monitoring is mostly dependent on post-leakage detection (such as concentration sampling), and it is difficult to identify potential hazards such as sealing ring eccentric wear and thread damage caused by lateral stress in real time during the plug-in and locking stages of the filling gun, and slow leakage or sudden leakage risks are easily formed;

[0005] Secondly, there is a lack of dynamic monitoring of vehicle displacement during the filling process, and accidental movement of the vehicle is easy to cause the filling gun to fall off and the hose to be pulled and broken, thereby causing hydrogen leakage;

[0006] Thirdly, when multiple filling machines are operated at the same time, the airflow generated by high-speed hydrogen leakage interferes with the hydrogen diffusion path, and the existing system cannot identify the risk of local concentration rising caused by such interference, and the environmental safety control ability is insufficient.

[0007] In view of the above technical defects, a solution is proposed. SUMMARY

[0008] The purpose of the present application is to solve the above-mentioned problems, and a fuel filling safety detection system applied to a hydrogen fuel cell vehicle is proposed.

[0009] The purpose of the present application can be achieved by the following technical solutions:

[0010] The fuel filling safety detection system applied to the hydrogen fuel cell vehicle comprises a safety detection platform, wherein the safety detection platform is in communication connection with:

[0011] A stress distribution monitoring unit monitors the stress distribution of the filling gun of the filling vehicle in the filling area; non-tight contact points and tight contact points are obtained according to data collection, and stress monitoring analysis is performed according to the distribution of the points;

[0012] A vehicle situation awareness unit performs vehicle situation awareness according to the filling process after completing the stress distribution monitoring;

[0013] A displacement influence early warning unit performs vehicle displacement influence early warning during the filling process;

[0014] A filling environment detection unit detects the hydrogen diffusion path of the filling area according to the running filling machine position of the filling area.

[0015] Further, the process of the stress distribution monitoring unit is as follows:

[0016] A micro fiber grating sensor array or a flexible piezoresistive film sensor is arranged annularly behind the front end sealing ring of the filling gun to collect the contact pressure stress data of multiple points on the circumference in real time;

[0017] The contact pressure stress threshold value is obtained according to the contact pressure stress of the filling gun and the current filling vehicle type, and is marked as the pressure stress threshold value. The contact pressure stress values of each point on the circumference of the filling gun are collected in real time, and the contact pressure stress values of each point are compared with the pressure stress threshold value. If the contact pressure stress value is lower than the pressure stress threshold value, it is marked as a non-tight contact point. If the contact pressure stress value is not lower than the pressure stress threshold value, it is marked as a tight contact point.

[0018] Further, the inclination angle of the filling gun circumference relative to the filling port is determined according to the distribution of the non-tight contact points and the tight contact points.

[0019] The stage of collecting and adjusting the filling flow to the set value during the filling stage of the filling gun is marked as the flow adjustment stage. When the inclination angle of the filling gun does not change during the flow adjustment stage, the hydrogen concentration of the gap corresponding to the inclination angle is recorded by the densimeter, and the built-in micro MEMS inclinometer in the gun head measures the deflection angle of the gun body relative to the standard plug axis, and is marked as the inclination angle.

[0020] According to the hydrogen concentration at the gap position under different air flow velocities, if the hydrogen concentration shows an upward trend, it indicates that the inclination angle causes hydrogen fuel leakage, generates a leakage alarm signal and sends it to the safety detection platform. If the hydrogen concentration does not show an upward trend, the hydrogen fuel filling amount and the vehicle hydrogen fuel increase amount are recorded, and the fuel increase deviation value is obtained by comparison. If the deviation value is higher than the set filling deviation value, a leakage early warning signal is generated and sent to the safety detection platform. If the deviation value is not higher than the set filling deviation value, the leakage is within the stable range, and a stable signal is generated and sent to the safety detection platform.

[0021] Further, after generating the stable signal, all hydrogenation stages except the flow adjustment stage are counted to obtain a hydrogenation duration stage; if the inclination angle of the refueling gun fluctuates, the corresponding inclination angle of the refueling gun in the hydrogenation duration stage is obtained, and the inclination low angle change and the duration of the gun head touching the inner wall at the current angle are recorded;

[0022] If the inclination low angle continues to increase or the duration of the gun head touching the inner wall at the current angle continues to rise, a stress distribution abnormal signal is generated and sent to the safety detection platform, and after the safety detection platform receives the stress distribution abnormal signal, stress control is performed on the non-tightly contacted points on the circumference of the refueling gun, and the deflection angle of the measuring gun body relative to the standard plug axis is adjusted;

[0023] If the inclination low angle does not continue to increase, and the duration of the gun head touching the inner wall at the current angle does not continue to rise, a stress distribution normal signal is generated and sent to the safety detection platform, and after the safety detection platform receives it, if there are non-tightly contacted points, the refueling gun refueling plug-in posture is adjusted according to the corresponding position, which is used as the detection standard for the next refueling cycle.

[0024] Further, the process of the vehicle situation awareness unit is as follows:

[0025] In the refueling matching stage, the vehicle posture is determined according to the current position of the vehicle; the internal hydrogen storage space of the vehicle is obtained, and in the horizontal state, the hydrogen concentration distribution inside the space is obtained according to the internal hydrogen storage space; a concentration distribution map of the balanced posture is constructed; when the vehicle posture is not in the horizontal state, the internal hydrogen storage space is inclined, and the concentration distribution of the same amount of space inside the hydrogen storage space under the corresponding posture inclination angle is collected; a concentration distribution map of the inclined posture is constructed;

[0026] And according to the comparison between the concentration distribution map of the balanced posture and the concentration distribution map of the inclined posture, if the hydrogen distribution concentration deviation of any position of the internal hydrogen storage space exceeds the set deviation threshold, it is inferred that the vehicle posture is affected; a posture interference signal is generated and sent to the safety detection center; otherwise, if the hydrogen distribution concentration deviation of any position of the internal hydrogen storage space does not exceed the set deviation threshold, it is inferred that the vehicle posture is not affected; that is, a posture awareness safety signal is generated and sent to the safety detection platform.

[0027] Further, after the safety detection center receives the posture interference signal, safety control is performed, that is, after the refueling machine and the vehicle establish communication, the real-time data of the high-precision inclination sensor integrated on the vehicle chassis are requested, including the front and rear inclination angles and the left and right inclination angles; the inclination angle data is converted into the horizontal offset in the vehicle coordinate system, combined with the installation model of the hydrogen storage tank in the vehicle, the equivalent safe refueling limit of the tank body under the current posture is calculated; it is judged whether the current inclination angle exceeds the safe refueling threshold; if not, the standard refueling curve is used; if it exceeds, a more conservative refueling curve after compensation is used.

[0028] Further, the process of displacement influence early warning unit is as follows:

[0029] Real-time acquisition of point cloud data; through point cloud registration algorithm, real-time calculation of three-dimensional position change of vehicle key feature points relative to filling machine; according to the three-dimensional position change of vehicle key feature points relative to filling machine, the moving direction of vehicle is determined, and according to the current position of filling gun and the length of hose matched with filling gun, the displacement influence early warning of vehicle is carried out;

[0030] When the hose moving direction corresponding to the position of filling gun adapts to the current moving direction of vehicle, if hose deformation occurs at any position of hose, it indicates that the adaptability of current moving direction is low, that is, when the vehicle moves at the current moving direction, the direction early warning is generated and sent to the safety detection center; When the hose moving direction corresponding to the position of filling gun adapts to the current moving direction of vehicle, if hose deformation does not occur at any position of hose, it indicates that the adaptability of current moving direction is high, that is, when the vehicle moves at the current moving direction, the direction early warning is generated and sent to the safety detection center.

[0031] Further, the process of filling environment detection unit is as follows:

[0032] According to the filling area, the hydrogen concentration of each position in the area is determined, and a concentration distribution map is generated for real-time monitoring, and the hydrogen diffusion path is obtained according to the air flow path of the filling area; according to the running stage of the running filling machine, the airflow corresponding to the hydrogen flow path generated by multiple high-speed hydrogen leaks is marked as an interference path;

[0033] When the hydrogen flow rate of the interference path increases under the current filling task in the filling area, the decrease span of the flow rate corresponding to the hydrogen diffusion path is obtained, and when the flow rate changes, the hydrogen concentration increase span of the corresponding position in the concentration distribution map is obtained.

[0034] Further, if the decrease span of the flow rate corresponding to the hydrogen diffusion path exceeds the decrease span threshold, or the hydrogen concentration increase span of the corresponding position in the concentration distribution map exceeds the increase span threshold, it is inferred that there is interference when the current multiple filling machines are running, and a filling environment early warning signal is generated and sent to the safety detection platform; if the decrease span of the flow rate corresponding to the hydrogen diffusion path does not exceed the decrease span threshold, and the hydrogen concentration increase span of the corresponding position in the concentration distribution map does not exceed the increase span threshold, it is inferred that there is no interference when the current multiple filling machines are running, and a filling environment safety signal is generated and sent to the safety detection platform.

[0035] Further, after receiving the refueling environment early warning signal, the safety detection platform controls the hydrogen diffusion path of the refueling area, reduces the influence of the interference path according to the flow path auxiliary regulation, and controls the refueling of the refueling machine at the source of the interference path to reduce the hydrogen flow speed during the shutdown and discharge, thereby reducing the hydrogen flow speed of the interference path.

[0036] Compared with the prior art, the beneficial effects of the present application are:

[0037] 1. A micro sensor array is arranged behind the front end sealing ring of the refueling gun to collect real-time circumferential contact stress data, which can accurately capture the stress distribution abnormalities during the plugging and unplugging stages. Compared with traditional post-detection, this method realizes closed-loop management of "early warning + in-process monitoring", avoiding the leakage hidden dangers caused by incomplete alignment, lateral stress locking and other operations. By comparing the stress threshold, the tight / non-tight contact points are marked, and the inclination angle is calculated accordingly, which can quantitatively evaluate the interface fitting state and provide data support for attitude adjustment. Combined with the measurement of the MEMS tilt angle and the monitoring of the gap hydrogen concentration by the densitometer, a "stress-angle-concentration" triple verification mechanism is formed, which can not only quickly identify immediate leakage (concentration rising trend), but also judge micro leakage (deviation value exceeding threshold) through refueling quantity deviation, and the alarm grading design (alarm signal stops refueling, early warning signal reduces speed monitoring) further realizes the refinement of safety control, reducing the impact of false alarms on refueling efficiency. The monitoring of the inclination angle float and the resistance time during the hydrogenation continuous stage can further avoid interface damage caused by long-term stress accumulation, and the attitude adjustment after refueling provides calibration basis for the next cycle, continuously optimizing the detection accuracy.

[0038] 2. By constructing the hydrogen storage space concentration distribution graph under horizontal and inclined attitude, the influence of vehicle attitude on hydrogen distribution is quantitatively analyzed for the first time, breaking through the detection blind area of traditional "default horizontal attitude"; real-time inclination angle data is obtained by using high-precision inclination angle sensor (ESP system) of vehicle chassis, and combined with the installation model of hydrogen storage tank to calculate the equivalent safe refueling limit, making the refueling curve adjustment more scientific - when the threshold is not exceeded, the standard curve is used to ensure efficiency, and when the threshold is exceeded, the compensation curve (reducing flow, pressure balance in advance) is used to avoid pressure imbalance risk, realizing the safety refueling strategy of "attitude adaptation + dynamic compensation", and improving the refueling safety of non-flat ground (such as parking lot slope, maintenance station).

[0039] 3. The laser / millimeter wave radar scanning vehicle feature point is installed on the column of the filling machine. The three-dimensional position change is calculated in real time through the point cloud registration algorithm, the dynamic tracking of the vehicle displacement is realized, and the disadvantage that the traditional "static warning" cannot deal with unexpected movement is solved; the adaptability is judged by combining the hose length and the moving direction, the low adaptability movement is identified through the hose deformation (the direction warning is generated and disconnected), and the distance red line warning is set when there is no deformation, which not only avoids the interruption of filling caused by excessive protection, but also timely intervenes in the risk incubation stage, effectively prevents the filling gun from falling off, the hose from breaking and other accidents.

[0040] 4. Through the concentration distribution map real-time monitoring and hydrogen diffusion path identification, combined with the air flow path auxiliary device (such as a blower), the visualization management and control of environmental safety is realized; the high-speed relief interference path during the operation of multiple machines is marked, the interference risk is judged through the flow speed drop span and the concentration rise span double threshold, and the technical short board that the traditional system ignores the multi-machine interference is solved. The diffusion path control (regulating the auxiliary device) and the filling machine control (reducing the relief speed) are taken for the interference risk, which can quickly reduce the risk of local hydrogen concentration rising and ensure the environmental safety during the parallel operation of multiple filling machines, and improve the overall operation efficiency of the hydrogen filling station. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to facilitate those skilled in the art to understand, the present application will be further described below in conjunction with the drawings.

[0042] Figure 1 The system principle block diagram of the present application is shown in the figure;

[0043] Figure 2 The method flow chart of the stress distribution monitoring unit in the present application is shown in the figure. DETAILED DESCRIPTION

[0044] In order to make those skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0045] In this paper, "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it independent or alternative to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0046] Please refer toFigure 1 As shown, the fuel filling safety detection system applied to the hydrogen fuel cell vehicle comprises a safety detection platform, wherein the safety detection platform is communicatively connected with a stress distribution monitoring unit, a vehicle situation awareness unit, a displacement influence early warning unit and a filling environment detection unit;

[0047] When the hydrogen fuel cell vehicle is fuel filling, the safety detection platform continuously monitors the filling area, and generates a stress distribution monitoring signal and sends it to the stress distribution monitoring unit;

[0048] Please refer to Figure 2 As shown, the stress distribution monitoring unit receives the stress distribution monitoring signal and monitors the stress distribution of the filling gun for the filling vehicle in the filling area;

[0049] Specific scenario: when the driver or the filler manually inserts the filling gun into the vehicle filling port, there may be incomplete alignment, lateral stress, and locking. In the long term or extreme case, it may cause the interface sealing ring to be worn out, the thread to be damaged, and the hidden danger of slow leakage or sudden leakage.

[0050] A micro fiber grating sensor array or a flexible piezoresistive film sensor is arranged annularly behind the front sealing ring of the filling gun to real-time collect contact pressure stress data of multiple points on the circumference;

[0051] According to the contact pressure stress set value obtained by the filling gun and the current filling vehicle type, and marked as the pressure stress threshold value, according to the real-time collection of the contact pressure stress value of each point on the circumference of the filling gun, the contact pressure stress value of each point is compared with the pressure stress threshold value, if the contact pressure stress value is lower than the pressure stress threshold value, it is marked as a non-tight contact point; if the contact pressure stress value is not lower than the pressure stress threshold value, it is marked as a tight contact point;

[0052] According to the distribution of non-tight contact points and tight contact points, the inclination angle of the filling gun circumference relative to the filling port is determined, that is, the filling gun circumference and the filling port should be fitted according to the set pressure stress value, when the non-tight contact point is generated, the corresponding point is away from the filling port, and the inclination angle between the filling gun circumference and the filling port is generated;

[0053] In the stage of collecting and adjusting the filling flow to the set value during the filling stage of the filling gun, it is marked as the flow adjustment stage; when the inclination angle of the filling gun does not change in the flow stage, the hydrogen concentration of the gap corresponding to the inclination angle is recorded by the densimeter, at the same time, the micro MEMS inclinometer is built-in the gun head to measure the deflection angle of the gun body relative to the standard plug axis; and marked as the inclination angle;

[0054] According to the air flow rate at different gap positions, the hydrogen concentration at the gap position is obtained. If the hydrogen concentration shows an upward trend, it indicates that the inclination angle causes hydrogen fuel leakage, and a leakage alarm signal is generated and sent to the safety detection platform. If the hydrogen concentration does not show an upward trend, record the hydrogen fuel filling amount and the vehicle hydrogen fuel increase amount, and obtain the fuel increase deviation value according to the comparison. If the deviation value is higher than the set filling deviation value, a leakage warning signal is generated and sent to the safety detection platform. If the deviation value is not higher than the set filling deviation value, the leakage is within a stable range, and a stable signal is generated and sent to the safety detection platform. It needs to be explained that the leakage alarm signal and the leakage warning signal are different alarm signals. When the alarm signal is generated, the filling needs to be stopped and the current area hydrogen concentration needs to be monitored. If necessary, the hydrogen concentration needs to be controlled. When the warning signal is generated, the filling needs to be slowed down and the area hydrogen concentration needs to be monitored. The slow-down control is performed according to the monitoring quantity.

[0055] After the stable signal is generated, all hydrogen filling stages except the flow adjustment stage are counted to obtain the hydrogen filling duration. If the inclination angle of the filling gun fluctuates, the inclination angle of the filling gun corresponding to the inclination angle during the hydrogen filling duration is obtained, and the inclination low angle change and the duration of the gun head touching the inner wall at the current angle are recorded.

[0056] If the inclination low angle continues to increase or the duration of the gun head touching the inner wall at the current angle continues to rise, it is inferred that the stress distribution monitoring during the filling of the filling gun is abnormal, a stress distribution abnormal signal is generated and sent to the safety detection platform, and the safety detection platform receives the stress distribution abnormal signal. After receiving the stress distribution abnormal signal, the safety detection platform controls the stress of the non-tight contact point on the circumference of the filling gun, adjusts the deflection angle of the measuring gun body relative to the standard plug axis. If the inclination low angle does not continue to increase, and the duration of the gun head touching the inner wall at the current angle does not continue to rise, it is inferred that the stress distribution monitoring during the filling of the filling gun is normal, a stress distribution normal signal is generated and sent to the safety detection platform, and the safety detection platform receives the stress distribution normal signal. After receiving the stress distribution normal signal, if there is a non-tight contact point, the safety detection platform adjusts the plug-in posture of the filling gun according to the corresponding position, which is used as the detection standard for the next filling cycle.

[0057] After the stress distribution monitoring is completed, the safety detection platform generates a vehicle situation awareness signal and sends it to the vehicle situation awareness unit.

[0058] The vehicle situation awareness unit receives the vehicle situation awareness signal and performs vehicle situation awareness during the filling process to ensure the accuracy of the filling monitoring.

[0059] In the filling matching stage, the vehicle attitude is determined according to the current position of the vehicle, i.e. horizontal or inclined, such as the slope of the parking lot, the edge of the pit in the maintenance station, and the unstable shoulder. The internal hydrogen storage space of the vehicle is obtained, and in the horizontal state, the hydrogen concentration distribution inside the space is obtained according to the internal hydrogen storage space. The concentration distribution graph of the balanced attitude is constructed.

[0060] When the vehicle posture is not in a horizontal posture, the internal hydrogen storage space is inclined, and the concentration distribution of the same amount inside the hydrogen storage space under the corresponding posture inclination angle is collected; and a concentration distribution map of the inclined posture is constructed;

[0061] According to the comparison between the concentration distribution map of the balanced posture and the concentration distribution map of the inclined posture, it is inferred whether the concentration distribution of the internal hydrogen storage space is affected by the vehicle posture when the current type of hydrogen fuel is filled, that is, when the hydrogen distribution concentration deviation of any position in the internal hydrogen storage space exceeds the set deviation threshold, it is inferred that the vehicle posture has an impact; a posture interference signal is generated and sent to the safety detection center, and after the safety detection center receives the posture interference signal, safety control is performed, that is, after the filling machine establishes communication with the vehicle, real-time data of the high-precision inclination sensor integrated in the vehicle chassis (commonly used in ESP / vehicle body stability system) is requested to be obtained, including front and rear inclination angles and left and right inclination angles; the inclination angle data is converted into a horizontal offset in the vehicle coordinate system, and combined with the installation model of the hydrogen storage tank in the vehicle, the equivalent safe filling limit of the tank body under the current posture is calculated;

[0062] It is judged whether the current inclination angle exceeds the safe filling threshold; if not, the standard filling curve is used; if it exceeds, the compensated and more conservative filling curve (such as reducing the maximum flow and performing pressure balance in advance) is used;

[0063] On the contrary, when the hydrogen distribution concentration deviation of any position in the internal hydrogen storage space does not exceed the set deviation threshold, it is inferred that the vehicle posture has no impact; that is, a posture perception safety signal is generated and sent to the safety detection platform;

[0064] The safety detection center generates a displacement influence early warning signal and sends it to the displacement influence early warning unit;

[0065] After the displacement influence early warning unit receives the displacement influence early warning signal, vehicle displacement influence early warning is performed during the filling process;

[0066] A small laser radar or millimeter wave radar is installed on the stand column of the filling machine, and the scanning surface is directed to the vehicle filling port area and the nearby vehicle body feature points (such as wheel hubs and license plate frames); point cloud data is obtained in real time; through a point cloud registration algorithm, the three-dimensional position change of the vehicle key feature points relative to the filling machine is calculated in real time;

[0067] The vehicle moving direction is determined according to the three-dimensional position change of the vehicle key feature points relative to the filling machine, and the vehicle displacement influence early warning is performed according to the current position of the filling gun and the length of the hose matched with the filling gun;

[0068] When the soft tube position corresponding to the position of the filling gun is adapted to the current vehicle moving position, if the soft tube deformation occurs at any position of the soft tube, it indicates that the current moving position is low in adaptability, that is, when the vehicle moves at the current moving position, a position warning is generated and sent to the safety detection center, and if the vehicle owner is not warned and the displacement control is not performed during the warning stage, the filling machine and the vehicle are disconnected, and the filling gun and the filling port are separated to avoid displacement influence;

[0069] When the soft tube position corresponding to the position of the filling gun is adapted to the current vehicle moving position, if the soft tube deformation does not occur at any position of the soft tube, it indicates that the current moving position is high in adaptability, that is, when the vehicle moves at the current moving position, a position fit is generated and sent to the safety detection center, the safety detection center sends the real-time displacement progress to the vehicle owner, and sets a distance red line for displacement warning;

[0070] The safety detection platform generates a filling environment detection signal and sends it to the filling environment detection unit;

[0071] After the filling environment detection unit receives the filling environment detection signal, the hydrogen diffusion path of the filling area is identified and detected according to the running filling machine position of the filling area, so as to infer the safety of the filling environment in the filling area;

[0072] The hydrogen concentration of each position in the filling area is determined according to the filling area, and a concentration distribution map is generated for real-time monitoring. The hydrogen diffusion path is obtained according to the air flow path of the filling area. It needs to be explained that the filling area will be set with devices such as air blowers and other equipment to assist the flow path.

[0073] According to the running stage of the running filling machine, the airflow corresponding to the hydrogen flow path generated by multiple high-speed hydrogen leaks is marked as an interference path;

[0074] When the hydrogen flow rate of the interference path increases under the current filling task in the filling area, the drop span of the flow rate corresponding to the hydrogen diffusion path is obtained, and when the flow rate changes, the hydrogen concentration rise span of the corresponding position in the concentration distribution map is obtained;

[0075] If the drop span of the flow rate corresponding to the hydrogen diffusion path exceeds the drop span threshold, or the hydrogen concentration rise span of the corresponding position in the concentration distribution map exceeds the rise span threshold, it is inferred that there is interference when the current multiple filling machines are running, a filling environment warning signal is generated and sent to the safety detection platform, and the safety detection platform receives the filling environment warning signal, controls the hydrogen diffusion path of the filling area, reduces the influence of the interference path according to the flow path assistance, and controls the filling according to the filling machine at the source of the interference path, so as to reduce the hydrogen flow rate when the machine is stopped and discharged, thereby reducing the hydrogen flow rate of the interference path;

[0076] If the drop span of the hydrogen diffusion path corresponding to the flow velocity does not exceed the drop span threshold value, and the hydrogen concentration rise span of the corresponding position in the concentration distribution map does not exceed the rise span threshold value, it is inferred that there is no interference when the current multiple filling machines are running, a filling environment safety signal is generated and sent to the safety detection platform.

[0077] The threshold value or the preset value, the preset range, etc. are set for result comparison and analysis, so as to determine whether it is good or not, and the size value thereof is set by combining large model analysis of sample data and artificial experience for input storage, and can be appropriately adjusted through seasonal or reasonable influence conditions;

[0078] The preferred embodiments disclosed above are only used to help explain the present application. The preferred embodiments do not describe all the details and limit the present application to the specific embodiments. Obviously, many modifications and variations can be made according to the content of the present application. The present application is selected and described in detail in order to better explain the principles and practical applications of the present application, so that those skilled in the art can well understand and utilize the present application. The present application is limited by the claims and their full scope and equivalents.

Claims

1. A fueling safety detection system for a hydrogen fuel cell vehicle, characterized by, The safety detection platform is communicatively connected with: The stress distribution monitoring unit monitors the stress distribution of the filling gun of the filling vehicle in the filling area; non-tight contact points and tight contact points are obtained according to data collection, and stress monitoring and analysis are performed according to the distribution of the points; The vehicle situation awareness unit performs vehicle situation awareness according to the filling process after completing the stress distribution monitoring; The displacement influence early warning unit performs vehicle displacement influence early warning during the filling process; The filling environment detection unit identifies and detects the hydrogen diffusion path of the filling area according to the operating filling machine position of the filling area.

2. The fuel filling safety detection system for a hydrogen fuel cell vehicle according to claim 1, characterized by, The process of the stress distribution monitoring unit is as follows: A micro fiber grating sensor array or a flexible piezoresistive film sensor is arranged annularly behind the front sealing ring of the filling gun to collect the contact pressure stress data of multiple points on the circumference in real time; The contact pressure stress threshold value is obtained according to the contact pressure stress of the filling gun and the type of the current filling vehicle, and is marked as the pressure stress threshold value; the contact pressure stress values of each point on the circumference of the filling gun are collected in real time, and the contact pressure stress values of each point are compared with the pressure stress threshold value; if the contact pressure stress value is lower than the pressure stress threshold value, it is marked as a non-tight contact point; if the contact pressure stress value is not lower than the pressure stress threshold value, it is marked as a tight contact point.

3. The fuel filling safety detection system for a hydrogen fuel cell vehicle according to claim 2, characterized by According to the distribution of the non-tight contact points and the tight contact points, the inclination angle of the filling gun circumference relative to the filling port is determined; During the filling stage of the filling gun, the stage of collecting and adjusting the filling flow to the set value is marked as the flow adjustment stage; when the inclination angle of the filling gun does not change during the flow adjustment stage, the hydrogen concentration of the gap corresponding to the inclination angle is recorded by the densitometer, and the micro MEMS inclinometer built in the gun head measures the deflection angle of the gun body relative to the standard plug axis; and is marked as the inclination angle; According to the hydrogen concentration at the gap position under different air flow velocities, if the hydrogen concentration shows an upward trend, it indicates that the inclination angle causes hydrogen fuel leakage, and a leakage warning signal is generated and sent to the safety detection platform; if the hydrogen concentration does not show an upward trend, the hydrogen fuel filling amount and the vehicle hydrogen fuel increase amount are recorded, and the fuel increase deviation value is obtained by comparison; if the deviation value is higher than the set filling deviation value, a leakage warning signal is generated and sent to the safety detection platform; if the deviation value is not higher than the set filling deviation value, the leakage is within a stable range, and a stable signal is generated and sent to the safety detection platform.

4. The fuel filling safety detection system for a hydrogen fuel cell vehicle according to claim 3, characterized by After the stable signal is generated, all hydrogen filling stages except the flow adjustment stage are counted to obtain the hydrogen filling duration stage; if the inclination angle of the filling gun fluctuates, the corresponding inclination angle of the filling gun in the hydrogen filling duration stage is obtained, and the inclination low angle change and the duration of the gun head touching the inner wall at the current angle are recorded; If the inclination low angle continuously increases, or the duration of the gun head touching the inner wall at the current angle continuously rises, an abnormal stress distribution signal is generated and sent to the safety detection platform, and the safety detection platform receives the abnormal stress distribution signal to control the stress of the non-tight contact points on the circumference of the filling gun, and adjust the deflection angle of the gun body relative to the standard plug axis. If the low-angle inclination does not continue to increase, and the duration of the gun head touching the inner wall at the current angle does not continue to rise, a normal stress distribution signal is generated and sent to the safety detection platform. After receiving the signal, the safety detection platform adjusts the filling gun filling insertion and extraction posture according to the corresponding position if there is a non-tight contact point, which is used as the detection standard for the next filling cycle.

5. The fuel filling safety detection system for a hydrogen fuel cell vehicle according to claim 1, wherein The process of the vehicle situation awareness unit is as follows: In the filling matching stage, the vehicle posture is determined according to the current position of the vehicle; the internal hydrogen storage space of the vehicle is obtained, and in the horizontal state, the hydrogen concentration distribution inside the space is obtained according to the internal hydrogen storage space; the concentration distribution map of the balanced posture is constructed; when the vehicle posture is not in the horizontal state, the concentration distribution of the same amount inside the hydrogen storage space under the corresponding posture inclination angle is collected; the concentration distribution map of the inclined posture is constructed; And according to the comparison between the concentration distribution map of the balanced posture and the concentration distribution map of the inclined posture, if the hydrogen distribution concentration deviation of any position in the internal hydrogen storage space exceeds the set deviation threshold, it is inferred that the vehicle posture is affected; a posture interference signal is generated and sent to the safety detection center; otherwise, if the hydrogen distribution concentration deviation of any position in the internal hydrogen storage space does not exceed the set deviation threshold, it is inferred that the vehicle posture is not affected; that is, a posture awareness safety signal is generated and sent to the safety detection platform.

6. The fuel filling safety detection system for a hydrogen fuel cell vehicle according to claim 5, wherein After receiving the posture interference signal, the safety detection center performs safety control, that is, after the filling machine and the vehicle establish communication, it requests to obtain the real-time data of the high-precision inclination sensor integrated on the vehicle chassis, including the front and rear inclination angles and the left and right inclination angles; the inclination data is converted into the horizontal offset in the vehicle coordinate system, combined with the installation model of the hydrogen storage tank in the vehicle, the equivalent safe filling limit of the tank body under the current posture is calculated; it is judged whether the current inclination angle exceeds the safe filling threshold; if not, the standard filling curve is used; if it exceeds, a more conservative filling curve after compensation is used.

7. The fuel filling safety detection system for a hydrogen fuel cell vehicle according to claim 1, wherein The process of the displacement influence early warning unit is as follows: Real-time point cloud data is obtained; the three-dimensional position change of the vehicle key feature points relative to the filling machine is calculated in real time through the point cloud registration algorithm; the vehicle moving direction is determined according to the three-dimensional position change of the vehicle key feature points relative to the filling machine, and the vehicle displacement influence early warning is performed according to the current position of the filling gun and the length of the hose matched with the filling gun; When the hose moving direction corresponding to the position of the filling gun adapts to the current vehicle moving direction, if hose deformation occurs at any position of the hose, it indicates that the current moving direction is low in adaptability, that is, when the vehicle moves at the current moving direction, a direction early warning is generated and sent to the safety detection center; when the hose moving direction corresponding to the position of the filling gun adapts to the current vehicle moving direction, if hose deformation does not occur at any position of the hose, it indicates that the current moving direction is high in adaptability, that is, when the vehicle moves at the current moving direction, a direction fit is generated and sent to the safety detection center.

8. The fuel filling safety detection system for a hydrogen fuel cell vehicle according to claim 1, wherein The process of the filling environment detection unit is as follows: According to the hydrogen concentration of each position in the filling area determination area, a concentration distribution map is generated for real-time monitoring, and a hydrogen diffusion path is obtained according to the air flow path of the filling area. According to the running stage of the running filling machine, the airflow corresponding to the hydrogen flow path generated by the hydrogen leakage at multiple high-speed positions is obtained, and is marked as an interference path; When the hydrogen flow rate of the interference path increases under the current filling task in the filling area, the decrease span of the flow rate corresponding to the hydrogen diffusion path is obtained, and when the flow rate changes, the increase span of the hydrogen concentration of the corresponding position in the concentration distribution map is obtained.

9. The fuel filling safety detection system for a hydrogen fuel cell vehicle according to claim 8, wherein If the decrease span of the flow rate corresponding to the hydrogen diffusion path exceeds the decrease span threshold, or the increase span of the hydrogen concentration of the corresponding position in the concentration distribution map exceeds the increase span threshold, it is inferred that there is interference when the current multiple filling machines are running, an alarm signal of the filling environment is generated and sent to the safety detection platform; If the decrease span of the flow rate corresponding to the hydrogen diffusion path does not exceed the decrease span threshold, and the increase span of the hydrogen concentration of the corresponding position in the concentration distribution map does not exceed the increase span threshold, it is inferred that there is no interference when the current multiple filling machines are running, a safety signal of the filling environment is generated and sent to the safety detection platform.

10. The fuel filling safety detection system for a hydrogen fuel cell vehicle according to claim 9, wherein After the safety detection platform receives the filling environment warning signal, the hydrogen diffusion path control of the filling area is carried out, the influence of the interference path is reduced according to the flow path auxiliary regulation, and the filling control is carried out according to the filling machine at the source of the interference path, so as to reduce the hydrogen flow rate when stopping discharging, thereby reducing the hydrogen flow rate of the interference path.

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