Gas vehicle gas filling behavior safety analysis method and system, and recording medium

Abstract

The invention discloses a gas vehicle gas filling behavior safety analysis method and system and a recording medium. A video of a to-be-filled area is recorded in real time and stored; judging whether a vehicle arrives in the to-be-charged area or not, and starting to capture a video; the behaviors of drivers and conductors, inspectors and filling personnel are judged; when the vehicle leaves the to-be-filled area after gas filling is finished, video interception is finished; and storing the intercepted video as a safety traceability witness. Whether a leakage checking behavior and a query verification behavior exist or not is judged according to the position change of the positioning sensor, a video can be provided as a safety traceability witness, law enforcement officers can remotely check at any time in a computer and a mobile terminal and do not need to frequently go to a filling use site for checking, use is convenient, a safety traceability evidence chain is fully closed, and the safety traceability evidence chain is safe and reliable. And gas cylinder filling is achieved, and using is safe and accurate.

Description

Technical Field

[0001] The present invention relates to the analysis of gas filling behavior, and specifically to a safety analysis method, system, and recording medium for the gas filling behavior of gas vehicles. Background Art

[0002] When gas vehicles are refueled, they need to comply with the "Special Equipment Production and Filling Unit Licensing Rules" TSG 07-2019, which requires at least one inspector and at least two filling personnel. It requires pre-filling inspections such as checking for leaks, checking vehicle and cylinder information, and wearing safety helmets for cryogenic liquid filling. The actual situation is that most gas fillings are not standardized and do not follow the procedures, which undoubtedly increases the safety risks of cylinder filling and use. Relevant departments require reducing the number of personnel going to the site for inspections, which in turn increases the difficulty of law enforcement. Summary of the Invention

[0003] To solve the defects of the above-mentioned prior art, the present invention provides a safety analysis method, system, and recording medium for the gas filling behavior of gas vehicles. The present invention can determine whether there is an act of checking for leaks and a pre-filling inspection act based on the position change of the positioning sensor, and can provide videos as safety traceability witnesses, which can be viewed by law enforcement personnel at the terminal without going to the site for inspections. It is convenient to use and the safety traceability witnesses are accurate.

[0004] To achieve the above technical objectives, the present invention adopts the following technical solutions: A safety analysis method for the gas filling behavior of gas vehicles, including,

[0005] Record the video of the waiting area in real time and store it;

[0006] Judge whether a vehicle arrives at the waiting area. If a vehicle arrives, record the current time point as t1, which is used as the start time for intercepting the video;

[0007] Judge the number of people in the video area to determine whether all the driver and passengers have gotten off the vehicle, and judge whether there is an act of an inspector opening the rear cover of the vehicle;

[0008] Judge whether there is a pre-filling inspection act on site where an inspector uses an explosion-proof handheld terminal to query vehicle and cylinder information, and judge whether there is an act of an inspector using a portable combustible gas detector to detect leaks;

[0009] When the vehicle leaves the waiting area after gas filling, record the current time point as t2, which is used as the end time for intercepting the video;

[0010] Save the video intercepted from time point t1 to time point t2 as a safety traceability witness.

[0011] Judging whether there is an act of an inspector using a portable combustible gas detector to detect leaks includes:

[0012] Obtain the initial position a1 of the portable combustible gas detector. Among them, the portable combustible gas detector is equipped with a detector positioning module, and the activity range of the portable combustible gas detector is within the area to be filled;

[0013] Obtain the real-time position a2 of the portable combustible gas detector;

[0014] Judge whether the real-time position a2 coincides with the initial position a1, and judge whether the real-time position a2 is within the area to be filled. If either of the conditions that the real-time position a2 coincides with the initial position a1 and the real-time position a2 is not within the area to be filled is met, it indicates that there is no behavior of an inspector using the portable combustible gas detector to detect leaks.

[0015] It also includes:

[0016] Convert the initial position a1 into two-dimensional coordinates a1(xa1, ya1);

[0017] Convert the real-time position a2 into two-dimensional coordinates a2(xa2, ya2);

[0018] Judge whether a2(xa2, ya2) coincides with a1(xa1, ya1), and judge whether a2(xa2, ya2) is within the area to be filled.

[0019] Judging whether there is an inspection behavior before on-site filling where an inspector uses an explosion-proof handheld terminal to query vehicle and gas cylinder information includes:

[0020] Obtain the initial position b1 of the explosion-proof handheld terminal. Among them, the explosion-proof handheld terminal is equipped with a handheld terminal positioning module, and the activity range of the explosion-proof handheld terminal is within the area to be filled;

[0021] Obtain the real-time position b2 of the explosion-proof handheld terminal;

[0022] Judge whether the real-time position b2 coincides with the initial position b1, and judge whether the real-time position b2 is within the area to be filled. If either of the conditions that the real-time position a2 coincides with the initial position a1 and the real-time position a2 is not within the area to be filled is met, it indicates that there is no inspection behavior before on-site filling where an inspector uses the explosion-proof handheld terminal to query vehicle and gas cylinder information.

[0023] It also includes:

[0024] Convert the initial position b1 into two-dimensional coordinates b1(xb1, yb1);

[0025] Convert the real-time position b2 into two-dimensional coordinates b2(xb2, yb2);

[0026] Determine whether b2(xb2, yb2) coincides with b1(xb1, yb1), and determine whether b2(xb2, yb2) is located within the area to be refueled.

[0027] It also includes a coordinate correction step:

[0028] Measure the actual distance L and the actual horizontal angle θ between the high-definition camera and the positioning base station, and calculate the actual coordinates C(xc, yc) of the high-definition camera;

[0029] Obtain the system distance L' and the system horizontal angle θ' between the high-definition camera and the positioning base station, and calculate the system coordinates C'(xc', yc') of the high-definition camera;

[0030] Calculate the coordinate correction value ΔC(Δxc, Δyc) between the actual coordinates C(xc, yc) and the system coordinates C'(xc', yc');

[0031] Add the coordinate correction value to the two-dimensional coordinates to obtain the accurate coordinate value.

[0032] The number of people includes one inspector, two filling personnel, and at least one driver and passenger.

[0033] A safety analysis system for gas vehicle refueling behavior, including,

[0034] A positioning base station;

[0035] A portable combustible gas detector for detecting gas leakage, with a built-in detector positioning module for positioning the real-time position of the portable combustible gas detector, used to determine whether the inspector has used the portable combustible gas detector to detect leakage;

[0036] An explosion-proof handheld terminal for recording vehicle and gas cylinder information, with a built-in handheld terminal positioning module for positioning the real-time position of the explosion-proof handheld terminal, used to determine whether the inspector has used the explosion-proof handheld terminal to query vehicle and gas cylinder information during the on-site pre-filling inspection;

[0037] Multiple high-definition cameras installed at high places in the safety area of the gas filling station for real-time recording and storing of videos in the area to be refueled, with a built-in camera positioning module for obtaining the position coordinates of the high-definition cameras;

[0038] A safety helmet worn on the inspector's head, equipped with a mobile camera for taking pictures of the gas cylinder and sending the gas cylinder pictures to the computer.

[0039] A computer-readable recording medium records a behavior analysis program for analyzing gas vehicle refueling behavior, and the behavior analysis program causes the computer to execute:

[0040] Real-time record and store videos in the area to be refueled;

[0041] Determine whether a vehicle arrives at the area to be refueled. If a vehicle arrives, record the current time point as t1, which serves as the start time for intercepting the video.

[0042] Determine the number of people in the video area to confirm whether all passengers and drivers have alighted, and determine whether there is an inspector opening the rear cover of the vehicle.

[0043] Determine whether there is an inspector's pre - filling inspection behavior of using an explosion - proof handheld terminal to query vehicle and cylinder information on - site, and determine whether there is an inspector's behavior of using a portable combustible gas detector to detect leaks.

[0044] When the vehicle leaves the area to be refueled after refueling is completed, record the current time point as t2, which serves as the end time for intercepting the video.

[0045] Save the video intercepted from time point t1 to time point t2 as a witness for safety traceability.

[0046] In summary, the present invention has achieved the following technical effects:

[0047] The present invention can determine whether there is an act of leak inspection and a pre - filling inspection act based on the position change of the positioning sensor, and can provide a video as a witness for safety traceability. Law enforcement officers can view it remotely on a computer or mobile terminal at any time, without the need to frequently go to the refueling and usage site for inspection. It is convenient to use, the safety traceability evidence chain is fully closed, and accurate traceability of cylinder refueling and usage safety is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a flowchart of a safety analysis method for gas vehicle refueling behavior according to the present invention;

[0049] Figure 2 is a schematic diagram of a gas station;

[0050] Figure 3 is a schematic diagram of the position of the detector;

[0051] Figure 4 is a schematic diagram of the position of the handheld terminal;

[0052] Figure 5 is a schematic diagram of the position of the high - definition camera. DETAILED DESCRIPTION OF THE INVENTION

[0053] The following further elaborates on the present invention in conjunction with the accompanying drawings.

[0054] This specific embodiment is merely an interpretation of the present invention and does not limit the present invention. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

[0055] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0056] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0057] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0059] Embodiment:

[0060] A safety analysis method for the gas filling behavior of a gas vehicle, comprising:

[0061] Recording the video of the area to be filled in real time and storing it; and

[0062] 100. Determine whether a vehicle arrives at the waiting area for refueling. If a vehicle arrives, record the current time point as t1, which serves as the start time for intercepting the video.

[0063] 200. Determine the number of people in the video area to confirm whether all drivers and passengers have gotten off the vehicle, and determine whether there is an inspector opening the rear cover of the vehicle.

[0064] 300. Determine whether there is an inspection behavior before on-site refueling where an inspector uses an explosion-proof handheld terminal to query vehicle and gas cylinder information, and determine whether there is an inspector using a portable combustible gas detector to detect leaks.

[0065] 400. When the vehicle leaves the waiting area after refueling, record the current time point as t2, which serves as the end time for intercepting the video.

[0066] 500. Save the video intercepted from time point t1 to time point t2 as a witness for safety traceability.

[0067] The present invention determines whether a vehicle arrives at the waiting area for refueling. The high-definition camera continuously shoots videos. Once a vehicle arrives, the video interception starts, and once the vehicle leaves, the interception stops. The video recording during this period is saved as a witness for safety traceability, which can easily prove whether the refueling behavior is correct and effective.

[0068] The present invention determines the number of people. Specifically, it detects based on heads and shoulders. According to the TSG 07-2019 "Special Equipment Production and Refueling Unit Licensing Rules", there is at least 1 inspector, at least 2 refueling personnel, 1 driver, and several passengers. The video recording is used to determine whether the vehicle refueling process meets the requirements of at least 1 inspector and at least 2 refueling personnel.

[0069] Further, in combination with Figure 2 and Figure 3 , determining whether there is an inspector using a portable combustible gas detector to detect leaks includes:

[0070] Obtain the initial position a1 of the portable combustible gas detector. Among them, the portable combustible gas detector is equipped with a detector positioning module, and the activity range of the portable combustible gas detector is within the waiting area for refueling.

[0071] Obtain the real-time position a2 of the portable combustible gas detector.

[0072] Determine whether the real-time position a2 coincides with the initial position a1, and determine whether the real-time position a2 is within the waiting area for refueling. If either of the conditions that the real-time position a2 coincides with the initial position a1 and the real-time position a2 is not within the waiting area for refueling is met, it indicates that there is no inspector using a portable combustible gas detector to detect leaks.

[0073] Among them, the portable combustible gas detector is built-in with a detector positioning module, which is used to locate the position of the portable combustible gas detector relative to the positioning base station. The initial position of the portable combustible gas detector is not fixed. When a vehicle arrives, the inspector should take the portable combustible gas detector to the rear of the vehicle to check for leaks. During this process, when the portable combustible gas detector moves, its position relative to the positioning base station changes. If the inspector does not take the portable combustible gas detector to check for leaks, then the position of the portable combustible gas detector will not change, and it will maintain a constant relative position with the positioning base station. This is used as a simple and efficient safety traceability witness for whether to check for leaks, without the need for law enforcement officers to go to the gas filling station.

[0074] When the real-time position a2 coincides with the initial position a1, it indicates that the position of the portable combustible gas detector has not changed, which means that the inspector has not taken the portable combustible gas detector to check for leaks, and there is no such behavior of checking for leaks. If the real-time position a2 is not located within the area to be filled, it also proves that there is no such behavior of checking for leaks. Therefore, as long as one of the conditions that the real-time position a2 does not coincide with the initial position a1 and the real-time position a2 is not located within the area to be filled is established, it proves that there is no such behavior of checking for leaks.

[0075] Specifically, as Figure 3 shown, the method for judging the position of the portable combustible gas detector is as follows:

[0076] Establish a two-dimensional coordinate system with the positioning base station as the center;

[0077] Convert the initial position a1 into two-dimensional coordinates a1(xa1, ya1);

[0078] Convert the real-time position a2 into two-dimensional coordinates a2(xa2, ya2);

[0079] Judge whether a2(xa2, ya2) coincides with a1(xa1, ya1), and judge whether b2(xb2, yb2) is located within the area to be filled.

[0080] Measure the coordinate range of the area to be filled in advance and input it into the system.

[0081] Furthermore, judging whether there is an inspection behavior before on-site filling where the inspector uses an explosion-proof handheld terminal to query vehicle and gas cylinder information includes:

[0082] Obtain the initial position b1 of the explosion-proof handheld terminal. Among them, the explosion-proof handheld terminal is built-in with a handheld terminal positioning module, and the activity range of the explosion-proof handheld terminal is within the area to be filled;

[0083] Obtain the real-time position b2 of the explosion-proof handheld terminal;

[0084] Determine whether the real-time position b2 coincides with the initial position b1, and determine whether the real-time position b2 is within the area to be filled. If either of the conditions that the real-time position a2 coincides with the initial position a1 and the real-time position a2 is not within the area to be filled is satisfied, it indicates that there is no pre-filling inspection behavior of the inspector using the explosion-proof handheld terminal to query vehicle and gas cylinder information.

[0085] Specifically, as Figure 4 shown, the method for determining the position of the explosion-proof handheld terminal is as follows:

[0086] Convert the initial position b1 into two-dimensional coordinates b1(xb1, yb1);

[0087] Convert the real-time position b2 into two-dimensional coordinates b2(xb2, yb2);

[0088] Determine whether b2(xb2, yb2) coincides with b1(xb1, yb1), and determine whether b2(xb2, yb2) is within the area to be filled.

[0089] The judgment principle of the explosion-proof handheld terminal is similar to that of the portable combustible gas detector, which will not be elaborated here.

[0090] In this embodiment, both the detector positioning module and the handheld terminal positioning module adopt the UWB + Bluetooth dual-mode positioning module, with high positioning accuracy and an error within 30 cm. Since the distances between the initial positions a1 and b1 and the rear of the vehicle are much greater than 30 cm, it is possible to accurately detect whether the positions of the portable combustible gas detector and the explosion-proof handheld terminal have changed.

[0091] In this embodiment, two-dimensional coordinates are used for position conversion. It is also possible to use matrix representation or coordinate system conversion.

[0092] Furthermore, it also includes a coordinate correction step:

[0093] Measure the actual distance L and the actual horizontal angle θ between the high-definition camera and the positioning base station, and calculate the actual coordinates C(xc, yc) of the high-definition camera;

[0094] Obtain the system distance L' and the system horizontal angle θ' between the high-definition camera and the positioning base station, and calculate the system coordinates C'(xc', yc') of the high-definition camera;

[0095] Calculate the coordinate correction value ΔC(Δxc, Δyc) between the actual coordinates C(xc, yc) and the system coordinates C'(xc', yc');

[0096] Add the coordinate correction value to the two-dimensional coordinates to obtain the accurate coordinate value.

[0097] For example, the corrected coordinates of the real-time position a2 are a2(xa2 + Δxc, ya2 + Δyc). Δxc and Δyc can be positive or negative values. By adding or subtracting the corresponding differences to xa2 and ya2, the correction can be completed, ensuring high positioning accuracy and minimizing errors as much as possible.

[0098] A safety analysis system for the gas filling behavior of gas vehicles, including

[0099] A positioning base station;

[0100] A portable combustible gas detector for detecting gas leakage. An in-built detector positioning module is used to locate the real-time position of the portable combustible gas detector, and is used to determine whether the inspector uses the portable combustible gas detector to detect leakage.

[0101] An explosion-proof handheld terminal for recording information about the vehicle and the gas cylinder. An in-built handheld terminal positioning module is used to locate the real-time position of the explosion-proof handheld terminal, and is used to determine whether the inspector uses the explosion-proof handheld terminal to query the information of the vehicle and the gas cylinder during the pre-filling inspection on-site.

[0102] Multiple high-definition cameras are installed at high places in the safe area of the gas filling station to record the video of the area to be filled in real time and store it. An in-built camera positioning module is used to obtain the position coordinates of the high-definition cameras.

[0103] A safety helmet is worn on the head of the inspector and is equipped with a mobile camera for taking photos of the gas cylinder and sending the photos of the gas cylinder to the computer.

[0104] An analysis and traceability device includes a video acquisition unit for connecting to multiple cameras and mobile cameras; it also includes a UWB + Bluetooth dual-mode positioning module for communicating with the detector positioning module, the handheld terminal positioning module, the positioning modules of the cameras, and the positioning module of the safety helmet.

[0105] The cameras use ordinary high-definition cameras, and both the fixed motion cameras on the safety helmets are connected to the video acquisition unit in the analysis and traceability device through a wireless network to achieve real-time acquisition and storage of video. The video stream service in the analysis and traceability device can provide remote video access separately.

[0106] The high-definition cameras, safety helmets, explosion-proof handheld terminals, and portable combustible gas detectors are all built-in with UWB + Bluetooth dual-mode positioning modules, which communicate with the UWB + Bluetooth dual-mode positioning module in the analysis and traceability device to achieve real-time positioning at the gas filling site through the positioning analysis unit.

[0107] The present invention also configures a computing device, which uses an edge computing device with the model number EC922 produced by Beijing Inhand Networks Co., Ltd., configured with 4G RAM, 16GB eMMC, and a built-in AI computing module. The high-definition camera uses a 4-million-pixel camera with the model number B14HV3-LT produced by Hangzhou Hikvision Digital Technology Co., Ltd. The positioning module can use a UWB positioning module with the model number MK8000TR7.9-GC produced by Shenzhen Silicon Transmission Technology Co., Ltd. The positioning base station can use a 4-antenna positioning base station with the model number GC-P2304 produced by Shenzhen Silicon Transmission Technology Co., Ltd. The safety helmet can use an intelligent safety helmet with the model number OT-AQM produced by Henan OTVer Electronics Technology Co., Ltd.

[0108] A computer-readable recording medium records a behavior analysis program for analyzing the gas vehicle refueling behavior, and the behavior analysis program causes the computer to execute:

[0109] Record the video of the waiting area in real time and store it.

[0110] Judge whether a vehicle arrives at the waiting area. If a vehicle arrives, record the current time point as t1, which is used as the start time for intercepting the video.

[0111] Judge the number of people in the video area to determine whether all the driver and passengers have got off the vehicle, and judge whether there is an act of an inspector opening the vehicle's rear cover.

[0112] Judge whether there is an inspection behavior before on-site refueling where an inspector uses an explosion-proof handheld terminal to query vehicle and gas cylinder information, and judge whether there is an act of an inspector using a portable combustible gas detector to detect leaks.

[0113] When the vehicle leaves the waiting area after refueling, record the current time point as t2, which is used as the end time for intercepting the video.

[0114] Save the video intercepted from time point t1 to time point t2 as a witness for safety traceability.

[0115] The high-definition camera records the video of the waiting area in real time. After edge computing, it judges whether a vehicle enters the waiting area. If so, while identifying the license plate, it judges the number of people in the video area, and records the recognition results such as the time stamp, license plate color, license plate number, and number of people. After the vehicle leaves and cannot be recognized, it enters the next cycle.

[0116] When a vehicle is recognized, edge computing obtains the real-time positions of the handheld leakage alarm, handheld explosion-proof terminal, and safety helmet through the positioning base station to form a movement trajectory.

[0117] Among them, edge computing is a prior art and will not be elaborated here.

[0118] The present invention installs positioning base stations in the office security area and is connected to the computing device by wire.

[0119] According to the specific location of the gas filling island in the gas station, install high-definition cameras, adjust the angles and focal lengths to meet the acquisition of high-definition videos of the vehicles in the parking spaces to be filled. Manually measure the distances and angles between the high-definition cameras and the base stations and compare them with the positioning (angles, distances) through the built-in positioning module to obtain the error correction values of the on-site positioning distances and angles.

[0120] After receiving the data uploaded by the base station, the computing device calculates to obtain the distances and angles through the built-in algorithm program.

[0121] The high-definition cameras record the videos of the area to be filled in real time and store them. The analysis program in the computing device analyzes through convolutional neural network (CNN) models such as ResNet, VGGNet, and Inception to determine whether there are vehicles in the videos. If there are, it means that vehicles have entered the area to be filled. Then, it identifies the license plates, determines the number of people in the video area, and records the recognition results such as the timestamp, license plate color, license plate number, and the number of people. If the license plate does not exist in the video, it means that the vehicle has left, and the software enters the next recognition loop. The recognition actions include:

[0122] License plate recognition: including license plate color and license plate number;

[0123] Face recognition: the identities of security inspection personnel and filling personnel;

[0124] Head and shoulder recognition: recognizing the number of people in the vehicle and counting the number of people getting off the vehicle;

[0125] Action recognition: security inspection personnel use a handheld gas leakage alarm to detect each gas cylinder in the trunk one by one;

[0126] Action recognition: filling personnel pick up and hang up the gun.

[0127] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A safety analysis method for the gas filling behavior of gas vehicles, characterized in that: Including, Real-time recording and storing the video of the waiting-to-be-charged area; Judging whether a vehicle arrives at the waiting-to-be-charged area. If a vehicle arrives, record the current time point as t1, which serves as the start time for video capture; Judging the number of people in the video area to determine whether all drivers and passengers have gotten off, and judging whether there is an act of an inspector opening the rear cover of the vehicle; Judging whether there is an on-site pre-filling inspection behavior of an inspector using an explosion-proof handheld terminal to query vehicle and cylinder information, and judging whether there is an act of an inspector using a portable combustible gas detector to detect leakage; When the vehicle leaves the waiting-to-be-charged area after gas filling is completed, record the current time point as t2, which serves as the end time for video capture; Save the video captured from time point t1 to time point t2 as a witness for safety traceability.

2. The safety analysis method for the gas filling behavior of a gas vehicle according to claim 1, wherein: Judging whether there is an act of an inspector using a portable combustible gas detector to detect leakage includes: Obtaining the initial position a1 of the portable combustible gas detector, where the portable combustible gas detector is equipped with a detector positioning module, and the activity range of the portable combustible gas detector is within the waiting-to-be-charged area; Obtaining the real-time position a2 of the portable combustible gas detector; Judging whether the real-time position a2 coincides with the initial position a1, and judging whether the real-time position a2 is within the waiting-to-be-charged area. If either of the conditions that the real-time position a2 coincides with the initial position a1 and the real-time position a2 is not within the waiting-to-be-charged area is met, it indicates that there is no act of an inspector using a portable combustible gas detector to detect leakage.

3. The safety analysis method for the gas filling behavior of a gas vehicle according to claim 2, characterized in that: It also includes: Converting the initial position a1 into two-dimensional coordinates a1(xa1, ya1); Converting the real-time position a2 into two-dimensional coordinates a2(xa2, ya2); Judging whether a2(xa2, ya2) coincides with a1(xa1, ya1), and judging whether a2(xa2, ya2) is within the waiting-to-be-charged area.

4. A safety analysis method for the gas filling behavior of a gas vehicle according to claim 1, characterized in that: Judging whether there is an on-site pre-filling inspection behavior of an inspector using an explosion-proof handheld terminal to query vehicle and cylinder information includes: Obtaining the initial position b1 of the explosion-proof handheld terminal, where the explosion-proof handheld terminal is equipped with a handheld terminal positioning module, and the activity range of the explosion-proof handheld terminal is within the waiting-to-be-charged area; Obtaining the real-time position b2 of the explosion-proof handheld terminal; Judging whether the real-time position b2 coincides with the initial position b1, and judging whether the real-time position b2 is within the waiting-to-be-charged area. If either of the conditions that the real-time position a2 coincides with the initial position a1 and the real-time position a2 is not within the waiting-to-be-charged area is met, it indicates that there is no on-site pre-filling inspection behavior of an inspector using an explosion-proof handheld terminal to query vehicle and cylinder information.

5. The safety analysis method for the gas filling behavior of a gas vehicle according to claim 4, characterized in that: It also includes: Converting the initial position b1 into two-dimensional coordinates b1(xb1, yb1); Converting the real-time position b2 into two-dimensional coordinates b2(xb2, yb2); Judging whether b2(xb2, yb2) coincides with b1(xb1, yb1), and judging whether b2(xb2, yb2) is within the waiting-to-be-charged area.

6. The safety analysis method for the gas filling behavior of a gas vehicle according to claim 2 or 4, characterized in that: It also includes a coordinate correction step: Measuring the actual distance L and the actual horizontal angle θ between the high-definition camera and the positioning base station, and calculating the actual coordinates C(xc, yc) of the high-definition camera; Obtain the system distance L’ and system horizontal angle θ’ between the high-definition camera and the positioning base station, and calculate the system coordinates C’ (xc’, yc’) of the high-definition camera; Calculate the coordinate correction value ΔC (Δxc, Δyc) between the actual coordinates C (xc, yc) and the system coordinates C’ (xc’, yc’); Add the coordinate correction value to the two-dimensional coordinates to obtain the accurate coordinate value.

7. A safety analysis method for the gas filling behavior of a gas vehicle according to claim 1, characterized in that: The number of people includes one inspector, two filling personnel, and at least one driver and passenger.

8. A safety analysis system for the gas filling behavior of gas vehicles, characterized in that: Applied to a safety analysis method for gas vehicle refueling behavior as described in any one of claims 1-6, including, a positioning base station; a portable combustible gas detector for detecting gas leakage, with a built-in detector positioning module for positioning the real-time position of the portable combustible gas detector, used to determine whether the inspector has the behavior of detecting leakage with the portable combustible gas detector; an explosion-proof handheld terminal for recording vehicle and cylinder information, with a built-in handheld terminal positioning module for positioning the real-time position of the explosion-proof handheld terminal, used to determine whether the inspector has the pre-filling inspection behavior of querying vehicle and cylinder information on-site with the explosion-proof handheld terminal; multiple high-definition cameras installed at a high place in the safe area of the gas station for real-time recording and storing of videos in the area to be filled, with a built-in camera positioning module for obtaining the position coordinates of the high-definition cameras; a safety helmet worn on the inspector's head, equipped with a mobile camera for taking pictures of the cylinders and sending the cylinder pictures to the computer.

9. A computer-readable recording medium recording a behavior analysis program for analyzing gas vehicle refueling behavior, the behavior analysis program causes the computer to execute: real-time recording and storing of videos in the area to be filled; judge whether a vehicle arrives in the area to be filled. If a vehicle arrives, record the current time point as t1, which serves as the start time for intercepting the video; judge the number of people in the video area to determine whether all the drivers and passengers have got off the vehicle, and judge whether there is a behavior of the inspector opening the rear cover of the vehicle; judge whether there is a pre-filling inspection behavior of the inspector querying vehicle and cylinder information on-site with the explosion-proof handheld terminal, and judge whether there is a behavior of the inspector detecting leakage with the portable combustible gas detector; When the vehicle leaves the area to be filled after refueling, record the current time point as t2, which serves as the end time for intercepting the video; Save the video intercepted from time point t1 to time point t2 as a safety trace witness.

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