A monitoring system for vehicle engine off state during refueling at a refueling station

Abstract

The application discloses a kind of monitoring systems of vehicle engine-off state in gas station gas filling process, its structure includes integrated vibration sensing unit's gas gun, vibration sensor in encapsulation shell, sensor cable, data acquisition transmission subsystem, data processing control subsystem, including alarm and gas source shutoff device's execution subsystem;The data acquisition transmission subsystem, including gas gun vibration signal in gas station gas filling machine operating condition information is collected, and is transmitted to data processing control subsystem;The engine-off state monitoring system, whether vehicle is off by tracking monitoring gas gun transmission vibration signal in gas filling process and makes corresponding processing, just vehicle ignition start, will trigger execution system work, to the voice of on-site personnel before vehicle actual driving is reminded, not passive intervention after accident occurs, fundamentally avoid the occurrence of personnel negligence caused by pull-off accident.

Description

TECHNICAL FIELD

[0001] The application relates to a monitoring system for a vehicle off state in a gas station refueling process and belongs to the technical field of gas station safety. BACKGROUND

[0002] No matter LNG, CNG or liquefied hydrogen gas, all have the characteristics of high pressure, flammability and explosiveness, and in addition, the related standards and specifications are not perfect in the early stage of technology popularization, and individual links are relatively weak, thus the safety hidden danger is increasingly concerned and valued. According to a domestic gas station accident statistics report, the main accident positions of gas stations include gas storage systems, compression systems, high-pressure pipelines, vehicle-mounted gas cylinders and gas sales systems, and the accident proportion of the gas sales system accounts for 60%, the related safety problems are prominent, and the related safety technology and management need to be improved.

[0003] At present, a lot of researches have been made on the gas station equipment breakaway or pull-off accident problem, the related safety technology mainly installs a breakaway valve on the pipeline, and as an emergency disconnecting device, has been compulsorily required to use. For example, a reusable LNG breakaway valve is recorded in the publication CN206918350U, the technical scheme of which adopts the structure of a magnet to realize the connection and reuse after the breakaway of the valve body; a safety disconnecting valve is recorded in the publication US20110214750 named "Fluid Conduit Safety System", the technical scheme of which is to set a compression spring inside the hose, the spring applies a pushing force (pulling force) to the two end flapper valves, as long as the hose is intact, the spring rod will push the valve to open, when the hose is longitudinally torn, the spring will lose its compression force and the pushing force on the valve will become a pulling force, so as to immediately close the valve.

[0004] The breakaway valve of the gas filling pipe on the market mainly has the following deficiencies: 1) high use cost; the disposable breakaway valve is most common in the market, but cannot be reused and has high cost; the reusable breakaway valve has a recycling cost comparable to the newly purchased one, and the reliability in reuse is affected by the accident impact and repair quality; 2) the breakaway valve is a passive emergency disconnecting device, which can only reduce the loss after the accident occurs, but cannot reduce the accident; 3) the breakaway valve has hidden dangers, because of the stress of the breakaway pipeline and the energy release of the high-pressure gas in the pipeline, the kinetic energy of the breakaway valve in the breakaway moment is very high, which constitutes a danger to the on-site personnel, and if it hits, it will also cause casualties.

[0005] In view of the gas filling equipment breakage accident and the defects of the prior art, the application provides a monitoring system for a vehicle off state in a gas filling process of a gas filling station, a vibration sensing device is integrated in a gas filling gun, when the gas filling gun is connected with a vehicle gas filling port, the vibration signal conducted by the gas filling gun is monitored to determine whether the vehicle is off and corresponding processing is performed, as long as the vehicle is started in the gas filling process, the execution system is automatically triggered to work, the on-site personnel are reminded by voice before the vehicle actually drives, and the breakage accident caused by personnel negligence is fundamentally avoided. SUMMARY

[0006] In view of the problems in the prior art, the application provides a monitoring system for a vehicle off state in a gas filling process of a gas filling station, thereby solving the above technical problems.

[0007] In order to achieve the above purpose, the application adopts the technical scheme of a monitoring system for a vehicle off state in a gas filling process of a gas filling station, comprising a gas filling gun integrated with a vibration sensing unit, a data acquisition and transmission subsystem, a data processing and control subsystem, and an execution subsystem.

[0008] The vibration sensing unit comprises a vibration sensor and a sensor cable in a packaging shell, and the packaging shell is fixedly connected with the outer surface of the gas filling gun; and the gas filling gun is arranged on a gas filling gun seat.

[0009] The data acquisition and transmission subsystem is independent of or integrated in an embedded control system in the main body of the gas filling machine, acquires the working condition information of the gas filling machine including the start-stop information of the gas filling, the vibration signal of the gas filling gun, and the position of the gas filling gun, and transmits the acquired information to the data processing and control subsystem.

[0010] The execution subsystem comprises a warning device and a gas source shutoff device of the gas filling machine.

[0011] When the gas filling gun is connected with the vehicle gas filling port, the vibration signal conducted by the gas filling gun is monitored to determine whether the vehicle is off and corresponding processing is performed.

[0012] The specific working process of the off state monitoring system is as follows:

[0013] Step S1: Before the vehicle is filled with gas, the off signal of the gas filling gun leaving the gun seat is transmitted by the data acquisition and transmission subsystem to the data processing and control subsystem, the monitoring system starts vibration monitoring, and only when the vibration signal of the engine operation is not detected and the remaining safety checks are normal, the data processing and control subsystem sends a control signal to allow the start of the gas filling process.

[0014] Step S2: In the process of refueling the vehicle, if the monitoring system detects the vibration signal of the engine running, such as the vehicle ignition starting, the alarm and the gas source shutoff are triggered synchronously; after the refueling is completed, if the monitoring system detects the vibration signal of the engine running before the refueling gun is put back to the refueling gun seat, the alarm of the execution subsystem is triggered; the alarm function includes voice reminding of the connection state of the refueling gun and the vehicle.

[0015] Step S3: The refueling gun back-to-seat signal is transmitted by the data acquisition and transmission subsystem to the data processing and control subsystem, and the monitoring system stops the vibration monitoring and enters the standby mode.

[0016] Further, the packaging shell is composed of a sealed shell and a rigid connecting piece.

[0017] The sealed shell is a shell with a plurality of parallel layers of composite structure, including an insulation layer and a heat insulation layer.

[0018] The heat insulation layer includes at least two structure layers and a heat insulation core layer between adjacent structure layers; the heat insulation core layer is one of a vacuum interlayer and a solid heat insulation material interlayer.

[0019] The rigid connecting piece is used to connect and fix with the outer surface of the refueling gun.

[0020] The execution subsystem includes an alarm and a gas source shutoff; the alarm is one or several of an audible and visual alarm, an alarm light, and a light-emitting warning board.

[0021] The gas source shutoff of the refueling machine is an electronic switch of a gas source conveying pipeline valve or a conveying pump power supply; the circuit on-off control structure contained in the electronic switch is one of a thyristor, a transistor, a field effect transistor, a silicon-controlled rectifier, and an electromagnetic relay; the vibration sensor is one of a piezoelectric vibration sensor, a piezoresistance vibration sensor, a capacitive vibration sensor, and an optical fiber vibration sensor.

[0022] Further, network communication is also included; the data processing and control subsystem is integrated into a computer of a remote control center; the data acquisition and transmission subsystem and the execution subsystem realize data exchange between the data processing and control subsystem of the remote control center through the network communication subsystem.

[0023] Further, f is defined as α a base frequency signal of the main shaft vibration when the engine is idling, R is the idling speed per minute, α is the number of cylinders, and β is the number of strokes; f is limited to a a theoretical range of 10 Hz≤f a ≤100 Hz; the time domain is divided into continuous time windows with equal width Δt, and the characteristic signal f bFor any window, f b is the periodic main vibration signal in the signal collected for the window, and f b is the frequency of the main vibration signal. a is within the theoretical range, such as f b is identified by the monitoring system, it is determined that the vehicle in the window is not turned off and is in an idle state.

[0024] The specific method is described as follows. First, for any data sequence X i , the operation is defined as the autocorrelation operation of its unbiased estimate,

[0025]

[0026] wherein, the order k is an integer satisfying 0≤k≤n-1, and the first-order operation is traversed by the value of K.

[0027] For any time window, the same operation is performed as follows,

[0028] The first step is a signal sampling step. When the gas gun is connected to the vehicle gas inlet, the vibration sensor collects the vehicle vibration signal conducted by the gas gun in real time. The second step is a signal preprocessing step. In the data acquisition and transmission subsystem, first, a band-pass filter with a passband of f1 to f2 is used to filter out vibration signals outside the passband to reduce the amount of operation, f1≤10Hz, and f2≥100Hz. The filtered signal is sorted according to the collection time to form an n-element original data sequence a i , n=f 采 ×Δt, the serial number i is an integer satisfying 1≤i≤n, and a i is the i-th signal amplitude.

[0029] The third step is a data processing control subsystem, which performs a signal processing and analysis step, including one or more combined analysis steps, which consists of a characteristic signal extraction step and a periodicity detection step.

[0030] Further, the combined analysis step is specifically as follows:

[0031] First, the first combined analysis step, 1) in the characteristic signal extraction step, the original data sequence a i is subjected to a operation, and different are sorted according to the value of k to form a new n-element data sequence The smaller the serial number i, the smaller the k, and the sampling gap τ=1 / f 采 A group of simulated time domain signals 2) in the periodicity detection step, the simulated time domain signal ​If periodicity is identified, it is determined that the vehicle is in idle state in the window, and the data processing ends; if periodicity is not identified, the next step of combination analysis is performed;

[0032] Then, the second step of combination analysis is performed; the same operation is performed on the data sequence The same operation is performed on the original data sequence in the first step of combination analysis, and the new n-element data sequence is denoted as J is the number of operations, and J=2 here; the simulated time-domain signal is If periodicity is identified, it is determined that the vehicle is in idle state in the window, and the window processing ends; if periodicity of the vibration signal is not identified, the next step of combination analysis is performed with as the new original data sequence, and the operation of the previous step of combination analysis is repeated, J=J+1; finally, when J reaches a preset upper limit of the loop, it is determined that the vibration signal in the window is irrelevant to whether the vehicle is started or not, and the window processing ends.

[0033] Further, for the simulated time-domain signal in any time window, the periodicity detection step adopts a time-domain periodicity detection algorithm; P max is defined as the highest peak value of the simulated time-domain signal in the window, and all peaks higher than 0.7×P max are included in the periodicity detection, and the time intervals of the peaks are calculated; if the time intervals of S consecutive peaks are the same, it is determined that the window-acquired signal contains a periodic characteristic signal f b ; S is an integer satisfying S≥5; if the amplitude of a sampling point signal is larger than that of one sampling point before and after it, the sampling point signal is a peak.

[0034] The monitoring system for vehicle engine-off state in the refueling process of a gas station provided by the application integrates a vibration sensing device in the refueling gun, and determines whether the vehicle is off or not by monitoring the vibration signal conducted by the refueling gun when the refueling gun is connected with the vehicle fuel inlet, and makes corresponding treatment. As long as the vehicle is started during the refueling process, the execution system is automatically triggered to work, and the on-site personnel are reminded by voice before the vehicle actually drives, instead of being intervened passively after the accident occurs, so that the accident caused by personnel negligence is fundamentally avoided. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 FIG. 1 is a schematic structural diagram of a gas dispenser of a monitoring system for vehicle engine-off state in the refueling process of a gas station according to Embodiment 1 of the application.

[0036] Figure 2 FIG. 3 is a flow chart of an algorithm of a characteristic signal identification method according to the application.

[0037] Figure 3 Input signal diagram for an experiment of the feature signal recognition method implemented by the present application.

[0038] Figure 4 For Figure 3 Result diagram for an experiment of the feature signal recognition method.

[0039] Figure 1 In the figure, 111 - air gun, 121 - vibration sensor, 122 - encapsulated housing, 123 - sensor cable, 13 - air machine main body, 131 - air gun seat, 14 - alarm of execution subsystem. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the present application clearer, further detailed description will be given below by means of the accompanying drawings and examples. However, it should be understood that the specific examples described herein are only used to explain the present application and are not intended to limit the scope of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application.

[0042] As Figure 1 shown, the air machine of the vehicle engine off state monitoring system during the air filling process of the air filling station according to the embodiment 1 of the present application, the structure thereof comprises an air gun 111, a vibration sensor 121 integrated on the structure of the air gun, a vibration sensor encapsulated housing 122, a vibration sensor sensor cable 123, an air machine main body 13, an air gun seat 131, an alarm 14 of execution subsystem. In addition, the vehicle engine off state monitoring system during the air filling process of the air filling station according to the embodiment 1 of the present application further comprises Figure 1 Non-mechanical structure not shown, including data acquisition and transmission subsystem, data processing and control subsystem, execution subsystem air source shutoff.

[0043] The engine off state monitoring system of the embodiment 1 is also a device for preventing air filling equipment pull-off accidents of the air filling station. The specific working process is as follows: Step 1, before filling the vehicle, the off seat signal of the air gun leaving the gun seat is transmitted by the data acquisition and transmission subsystem to the data processing and control subsystem, and the engine off state monitoring system starts to monitor; if the engine running vibration signal is detected, the data processing and control subsystem unconditionally prevents the start of the air filling process; if the engine is not detected, other safety checks are normal, and the vehicle starts to be filled with air;

[0044] Step 2, during the vehicle refueling process, such as the vehicle ignition start, the monitoring system detects the vibration signal of the engine operation, then synchronously triggers the alarm and the gas source shutoff; after the vehicle refueling is completed, before the refueling gun is put back into the gun seat, if the monitoring system detects the vibration signal of the engine operation, the alarm of the execution subsystem is triggered; the alarm function includes voice reminding of the connection state of the refueling gun and the vehicle; this step describes the technical solution, which is also a prevention method for the pull-off accident and the pull-off accident of the refueling equipment.

[0045] Step 3, the refueling gun return signal is transmitted by the data acquisition and transmission subsystem to the data processing and control subsystem, and the monitoring system stops vibration monitoring and enters standby mode.

[0046] In Example 1, the signals of the refueling gun dismounting and mounting are sensed by the infrared sensor integrated in the gun seat of the refueling gun, and can also be switch signals emitted by the mechanical switch structure integrated in the gun seat of the refueling machine.

[0047] Further, the packaging shell 122 is preferably composed of a sealing shell and a rigid connecting piece; the sealing shell is a shell with a plurality of parallel layers of composite structure, including an insulation layer and a heat insulation layer; the heat insulation layer includes at least two structure layers and a heat insulation core layer between adjacent structure layers; the heat insulation core layer is one of a vacuum interlayer and a solid heat insulation material interlayer, which is a prior art; the rigid connecting piece is used for connecting and fixing with the outer surface of the refueling gun.

[0048] Further, the execution subsystem includes an alarm and a gas source shutoff; the alarm is one or several of an audible and visual alarm, an alarm light, and a light-emitting warning board; the gas source shutoff is an electronic switch of a gas source conveying pipeline valve or a conveying pump power supply; the electronic switch includes a circuit on-off control structure which is one of a thyristor, a transistor, a field effect transistor, a silicon-controlled rectifier, and an electromagnetic relay; the vibration sensor is one of a piezoelectric vibration sensor, a piezoresistive vibration sensor, a capacitive vibration sensor, and an optical fiber vibration sensor.

[0049] Further, the preferred monitoring system for the vehicle engine off state during the refueling process of the refueling station further includes a network communication subsystem, and the data processing and control subsystem is integrated into a computer of a remote control center. The data acquisition and transmission subsystem and the execution subsystem realize data exchange between the data processing and control subsystems of the remote control center through the network communication subsystem.

[0050] In existing technologies, the original vibration signal of an engine consists of a series of harmonics with the spindle rotation frequency as the fundamental frequency. This signal is complex and non-stationary, time-varying. Therefore, analyzing engine vibration signals requires a complex combination method to handle different engine operating states. However, complex algorithms result in high computational load and poor robustness to actual processes.

[0051] Figure 2 This is a flowchart illustrating the algorithm for the feature signal recognition method implemented in this invention. This invention is based on practical considerations. Vehicles at gas stations, whether parked and running without being turned off or illegally started during refueling, will inevitably idle for a certain period. Therefore, a feature signal recognition method for automotive engine idling vibration is proposed. This method determines whether the vehicle is turned off by tracking the vibration signal during idling. Engine idling vibration is relatively stable, the vibration signal composition is relatively simple, the signal analysis computation is small, and it has good robustness. The specific steps of the feature signal recognition method for automotive engine idling vibration are as follows: For any time window, the following operations are performed:

[0052] The first step is signal sampling; when the gas nozzle is connected to the vehicle's gas inlet, the vibration sensor collects the vehicle vibration signal transmitted by the gas nozzle in real time. The second step is signal preprocessing; in the data acquisition and transmission subsystem, a bandpass filter with a frequency band of f1 to f2 is used to filter out vibration signals outside the band to reduce computational load. Here, f1 ≤ 10Hz, f2 ≥ 100Hz. After filtering, the signals are sorted according to their acquisition time to form an n-ary original data sequence a. i n = f 采 ×Δt, where the index i is an integer satisfying 1≤i≤n, a i Let i be the amplitude of the i-th signal;

[0053] The third step is the data processing and control subsystem, which performs signal processing and analysis steps, including one or more combined analysis steps, consisting of feature signal extraction steps and periodic detection steps.

[0054] First, in the first combinational analysis step, 1) in the feature signal extraction step, the original data sequence a is analyzed. i Do it once Operations, for different Sort the data according to the value of k to form a new sequence of n data. The smaller the sequence number i, the smaller the corresponding k, and the sampling interval r = 1 / f 采 A set of analog time-domain signals can be obtained from the above calculations. 2) In the periodic detection step, the analog time-domain signal is... If the periodicity is identified, it is determined that the vehicle is in idle state in the window, and the data processing ends; if the periodicity is not identified, the next step of combination analysis is performed;

[0055] Then, the second step of combination analysis is performed; the same operation is performed on the data sequence The same operation is performed on the original data sequence in the first step of combination analysis, and the new n-element data sequence is denoted as J is the number of operations, and J=2 here; the simulated time-domain signal is If the periodicity is identified, it is determined that the vehicle is in idle state in the window, and the data processing ends; if the periodicity is not identified, the next step of combination analysis is performed with as the new original data sequence, and the first step of combination analysis is repeated, and J=J+1.

[0056] Finally, when J reaches the preset upper limit of the loop, it is determined that the vibration signal in the window is irrelevant to the starting of the vehicle, and the processing of the window ends.

[0057] Figure 3 Fig. 1 is an input signal diagram of an experiment of a feature signal identification method according to the present application, Figure 4 Fig. 2 is a result diagram of the same experiment of the feature signal identification method. Figure 3 Fig. 3 is a result diagram of the same experiment of the feature signal identification method.

[0058] The main vibration signal is defined as the vibration frequency signal with the highest energy proportion in the signal collected in a time window, Figure 3 wherein Figure 3 -a is an arbitrarily set main vibration signal, Figure 3 -b is a doped signal, which is Figure 3 -a signal with two weak periodic signals and one strong noise signal added; Figure 4 wherein Figure 4 -a is a doped signal with one operation result, Figure 4 -b is a doped signal with two operation results, Figure 4 -c is a doped signal with three operation results.

[0059] Figure 3 and Figure 4 The signal processing experiment is shown, and the comparison Figure 3 -a and Figure 4It can be seen from the results that the preset main vibration signal is completely separated out almost without loss. The results further prove that the characteristic signal identification method of the automobile engine idle speed vibration can suppress all signals other than the periodic main vibration signal, including noise and periodic signals of non-main vibration frequency, to achieve the effect of completely separating out the main vibration signal, which is superior to the existing vibration signal analysis technology. Specifically, the sampling gap r = 1 / f 采 A set of analog time domain signals can be obtained by the above calculation The original data sequence a i The corresponding original time domain signal (a i , iτ) is normalized to obtain the normalized original signal And Compared with each other, at each sampling time point iτ, the two contain the characteristic signal f b The amplitude is the same, and The signal components other than f b in the normalized original signal are weakened in .

[0060] In view of the gas filling equipment breakage accident and the defects of the prior art, the present application provides a monitoring system for the vehicle engine off state in the gas filling process of a gas filling station. The gas filling gun is integrated with a vibration sensing device. When the gas filling gun is connected with the vehicle gas filling port, the vibration signal conducted by the gas filling gun is monitored to determine whether the vehicle is off and make corresponding processing. As long as the vehicle is started during the gas filling process, the execution system will be automatically triggered to work. The system reminds the on-site personnel by voice before the vehicle actually drives, and is not passive intervention after the accident occurs. Therefore, the occurrence of the breakage accident caused by personnel negligence is fundamentally avoided.

[0061] The above only describes the preferred embodiments of the present application and should not be used to limit the present application. Any modification, equivalent replacement or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A system for monitoring the off status of a vehicle during a refueling operation at a refueling station, the system comprising: a vehicle detection system; a vehicle identification system; a vehicle off detection system; and a vehicle off notification system. The monitoring system comprises a gas filling gun integrated with a vibration sensing unit, a data acquisition and transmission subsystem, a data processing and control subsystem, and an execution subsystem; The vibration sensing unit comprises a vibration sensor (121) and a sensor cable (123) in a packaging shell (122) fixedly connected to the outer surface of the gas filling gun (111); the gas filling gun (111) is arranged on a gas filling gun seat (131); The data acquisition and transmission subsystem is independent of or integrated with an embedded control system in the gas filling machine main body (13) and collects gas filling machine working condition information including gas filling start-stop information, gas filling gun (111) vibration signals, and gas filling gun (111) position, and transmits the collected information to the data processing and control subsystem; The execution subsystem comprises a warning device (14) and a gas source shutoff device; When the gas filling gun (111) is connected to the vehicle gas filling port, the system determines whether the vehicle is turned off by monitoring the vibration signals conducted by the gas filling gun (111) and performs corresponding processing; The specific working process of the engine off state monitoring system is as follows: Step S1: Before filling the vehicle, the off seat signal of the gas filling gun (111) is transmitted by the data acquisition and transmission subsystem to the data processing and control subsystem, the monitoring system starts vibration monitoring, and only when no vibration signal of the engine running is detected and the remaining safety checks are normal, the data processing and control subsystem sends a control signal to allow the start of the gas filling process; Step S2: During the process of filling the vehicle, if the vehicle is started, the monitoring system detects the vibration signal of the engine running, and then synchronously triggers the warning device (14) and the gas source shutoff device; after the vehicle is filled with gas, before the gas filling gun (111) is returned to the gas filling gun seat (131), if the monitoring system detects the vibration signal of the engine running, the warning device (14) of the execution subsystem is triggered; the functions of the warning device (14) include voice reminders of the connection state of the gas filling gun and the vehicle; Step S3: The return seat signal of the gas filling gun (111) is transmitted by the data acquisition and transmission subsystem to the data processing and control subsystem, and the monitoring system stops vibration monitoring and enters standby mode; Also included is a method for identifying the characteristic signal of the vehicle idle speed vibration during the refueling process at the gas station, defining f a as the base frequency signal of the main shaft vibration during engine idle operation R is the idle speed per minute, α is the number of cylinders, β is the number of strokes, and f a is defined as the base frequency signal of the main shaft vibration during engine idle operation a is defined as the base frequency signal of the main shaft vibration during engine idle operation b , the time domain is divided into continuous time windows of equal width Δt, and the characteristic signal f b is defined as the periodic main vibration signal in the signal collected for any window, and f b is defined as the periodic main vibration signal in the signal collected for any window, and f a is defined as the periodic main vibration signal in the signal collected for any window, and f b is defined as the periodic main vibration signal in the signal collected for any window, and f The specific method is described as follows, first of all, any data sequence X containing n elements i , define The operation is the autocorrelation operation of its unbiased estimate wherein, the integer k satisfies 0≤k≤n-1, 1st K value is traversed in the operation; the same operation is performed on any time window as follows, First step, signal sampling step; when the gas filling gun is connected to the vehicle gas filling port, the vibration sensor real-time collects the vehicle vibration signals conducted by the gas filling gun; Second step, signal pre-processing step; in the data acquisition and transmission subsystem, first filtered through the frequency band f1 to f2 band-pass filter, filter out the vibration signal through the frequency band to reduce the amount of operation, wherein f1≤10Hz, f2≥100Hz; after filtering the signal according to the collection time in order to form n original data sequence a i , n = f 采 × Δt, the serial number i is an integer satisfying 1≤i≤n, a i The amplitude of the i-th signal; Third step, data processing and control subsystem, signal processing and analysis step, including 1 step or multiple combined analysis steps, which consists of characteristic signal extraction step and periodicity detection step.

2. A system for monitoring the engine off condition of a vehicle during refueling at a refueling station as claimed in claim 1 wherein, The packaging shell is composed of a sealed shell and a rigid connecting piece; The sealed shell is a shell with multiple parallel layers of composite structure, including an insulation layer and a thermal insulation layer; The thermal insulation layer comprises at least two structure layers and a thermal insulation core layer between adjacent structure layers; the thermal insulation core layer is one of a vacuum interlayer and a solid thermal insulation material interlayer; The rigid connecting piece is used to connect and fix the outer surface of the gas filling gun; The execution subsystem comprises a warning device and a gas source shutoff device; the warning device is one or several of an audible and visual alarm, a warning light, and a light-emitting warning board. The air source shutoff device of the air charger is an electronic switch of a gas source conveying pipeline valve or a conveying pump power supply; the electronic switch comprises a circuit on-off control structure which is one of a thyristor, a transistor, a field effect transistor, a silicon controlled rectifier and an electromagnetic relay; The vibration sensor (121) is one of a piezoelectric vibration sensor, a piezoresistance vibration sensor, a capacitive vibration sensor and an optical fiber vibration sensor.

3. A system for monitoring the engine off condition of a vehicle during refueling at a refueling station as recited in claim 1, wherein Further comprising network communication; the data processing control subsystem is integrated into a computer of a remote control center; the data acquisition transmission subsystem and the execution subsystem realize data exchange with the data processing control subsystem of the remote control center through the network communication subsystem.

4. A system for monitoring the engine off status of a vehicle during refueling at a refueling station as recited in claim 1, further comprising: The combination analysis step is specifically: First, the first combination analysis step, 1) in the feature signal extraction step, the original data sequence a i do 1 operation, for different According to the value of k, the new n data sequence is sorted to form a new n data sequence The smaller the sequence number i, the smaller the k, and the sampling gap τ = 1 / f 采 From the above calculation, a group of analog time domain signals 2) In the periodicity detection step, the analog time domain signal Periodicity detection is performed, such as identifying signal periodicity, it is determined that the vehicle is in idle state in the window, and the data processing is ended; if the signal periodicity is not determined, the next combination analysis step is performed; Then, the second combination analysis step; the same operation is performed on the data sequence of the first combination analysis step, and the new n-tuple data sequence is denoted as J is the number of operations, where J=2; the periodicity detection algorithm is performed on the simulated time-domain signal If a periodic vibration signal is identified, it is determined that the vehicle is in an idle state within the window, and the window processing ends. If the periodicity of the vibration signal is not determined, then the above step is repeated with a new original data sequence, and J = J + 1; finally, when J reaches a preset upper limit of the loop, it is determined that the window vibration signal is irrelevant to whether the vehicle is started or not, and the window processing is ended.

5. A system for monitoring the engine off status of a vehicle during refueling at a refueling station as recited in claim 1, further comprising: For the analog time domain signal of any time window, the periodic detection step adopts a time domain periodic detection algorithm; define P max For the highest peak value of the analog time domain signal in the window, all peaks higher than 0.7×P max are included in the periodic detection, and the time interval of each peak is calculated. If the time intervals of the continuous S peaks are the same, it is determined that the window collected signal contains a periodic characteristic signal f b ; S is an integer satisfying S≥5; if the amplitude of any sampling point signal is greater than that of the one sampling point before and after it, the sampling point signal is a peak.

Images