CN114942477A - Hydrogen leakage diffusion monitoring method and system for liquid hydrogen fuel cell automobile - Google Patents
Hydrogen leakage diffusion monitoring method and system for liquid hydrogen fuel cell automobile Download PDFInfo
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Abstract
The invention provides a hydrogen leakage diffusion monitoring method and a hydrogen leakage diffusion monitoring system for a liquid hydrogen fuel cell automobile, which belong to the technical field of fuel cell automobiles and are used for acquiring hydrogen concentration data of a plurality of detection points; acquiring temperature data inside the liquid hydrogen storage and supply system; acquiring pressure data inside the liquid hydrogen storage and supply system; and performing multi-stage fault diagnosis according to the collected hydrogen concentration data, temperature data and pressure data, if a fault occurs, sending a buzzer alarm and sending a fault code to the vehicle control unit, and the vehicle control unit controls the action electromagnetic valve to close the hydrogen supply pipeline. According to the invention, the hydrodynamics simulation software is used for predicting the liquid hydrogen leakage diffusion with multiple influence factors to reasonably arrange the mounting point positions of the hydrogen concentration sensor, so that the response speed of the hydrogen leakage monitoring system is improved, the low-temperature hydrogen leakage monitoring performance is improved, and the accuracy and the adaptability of the liquid hydrogen leakage monitoring system are improved.
Description
Technical Field
The invention relates to the technical field of fuel cell automobiles, in particular to a hydrogen leakage diffusion monitoring method and a hydrogen leakage diffusion monitoring system of a liquid hydrogen fuel cell automobile.
Background
Hydrogen, a fuel with a high energy density, is regarded as an important fuel that can replace fossil fuels in the future. Liquid hydrogen has higher energy density than hydrogen, is widely applied to national defense, military industry and aerospace science and technology, and plays an increasingly important role in future daily life, such as application to fuel cell automobiles.
However, hydrogen is a flammable and explosive gas, the volume fraction of the flammable and explosive gas ranges from 4% to 75%, and in daily application, leakage of hydrogen or liquid hydrogen may bring about the hazards of explosion, suffocation and frostbite to the surrounding environment and people. Therefore, an accurate and efficient liquid hydrogen leakage prediction method and system for predicting the diffusion trend of liquid hydrogen leakage and monitoring the liquid hydrogen leakage event in real time are urgently needed. The detection method of the liquid hydrogen leakage is to detect the vaporized low-temperature hydrogen, the low-temperature hydrogen is mainly detected by a hydrogen concentration sensor, but the influence of temperature and humidity on the hydrogen concentration sensor is large, the temperature of the liquid hydrogen is 250 ℃ below zero, the temperature and the humidity of the environment of a leakage near field can be reduced rapidly when the liquid hydrogen leaks, so the hydrogen concentration sensor is not suitable for being installed in the liquid hydrogen leakage near field, but the response speed of the hydrogen concentration sensor for detecting the liquid hydrogen leakage can be influenced by too far installation points, and a method and a system for balancing the upper-mentioned factors are urgently needed.
The existing liquid hydrogen leakage monitoring technical scheme mainly judges the easy leakage point positions of a liquid hydrogen storage and supply system of a tested device, such as a joint, a welding part and a valve box, through experience, and then a hydrogen concentration sensor is installed above the easy leakage position for a certain distance or installed at the top of a closed or semi-closed place where a tested object is located.
The existing technical scheme for monitoring the hydrogen leakage of the liquid hydrogen fuel cell automobile lacks deep research on the selection of the mounting point position of the hydrogen concentration sensor, and the selection is carried out by experience, which may cause large lag response of a monitoring system to the leakage accident, thereby missing the optimal action period of closing the valve of the vehicle-mounted liquid hydrogen storage and supply system. Simultaneously, liquid hydrogen leakage diffusion path also receives the multifactor influence of leaking out quantity, leakage position and external environment factor such as wind speed, wind direction, temperature, ground coefficient of heat conductivity, prior art scheme is difficult to all take these factors into account, when the influence factor changes, hydrogen concentration sensor is too close diffusion range, receives microthermal influence, the point position that originally can normally monitor will become invalid, too keep away from diffusion range, then can lead to monitoring warning and valve to close the phenomenon that the action is serious hysteresis can not monitor even liquid hydrogen leakage.
Disclosure of Invention
The invention aims to provide a hydrogen leakage diffusion monitoring method and a hydrogen leakage diffusion monitoring system for a liquid hydrogen fuel cell automobile, which can effectively predict the diffusion tendency of liquid hydrogen when the liquid hydrogen is heavily blocked and hydrogen leakage occurs under different leakage modes and external factors, and improve the accuracy and adaptability of low-temperature hydrogen leakage monitoring, so as to solve at least one technical problem in the background technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the invention provides a hydrogen leakage diffusion monitoring method for a liquid hydrogen fuel cell automobile, which comprises the following steps:
acquiring hydrogen concentration data of a plurality of detection points; wherein the determination of the detection point position comprises: constructing a fluid domain by combining a model of the liquid hydrogen fuel cell automobile and the space environment; carrying out grid division on the constructed fluid domain and determining a hydrogen leakage diffusion simulation model; arranging hydrogen concentration data detection points in a hydrogen leakage diffusion simulation model, performing multi-factor leakage simulation set result post-processing, judging whether a data curve of a simulation monitoring point is in accordance with expectation, and if not, re-arranging the detection points until the data curve is in accordance with the expectation;
acquiring temperature data inside the liquid hydrogen storage and supply system;
acquiring pressure data inside the liquid hydrogen storage and supply system;
and performing multi-stage fault diagnosis according to the collected hydrogen concentration data, temperature data and pressure data, if a fault occurs, sending a buzzer alarm and sending a fault code to the vehicle control unit, and the vehicle control unit controls the action electromagnetic valve to close the hydrogen supply pipeline.
Preferably, in combination with the model of the liquid hydrogen fuel cell vehicle and the spatial environment thereof, the fluid domain is constructed, including: obtaining a physical model of the liquid hydrogen fuel cell automobile and simplifying the physical model; and constructing a fluid domain according to the space environment of the liquid hydrogen fuel cell automobile.
Preferably, the fluid domain is divided by adopting a structured grid, the grid near the leakage port is encrypted, a boundary layer grid is divided, and the size of the grid depends on the distance from the leakage port; a mixture model and a readable k-e turbulence model are adopted to simulate a two-phase multi-component flow process, and an evaporation-condensation model is adopted in an interphase mass transfer process.
The hydrogen leakage diffusion monitoring method of the liquid hydrogen fuel cell vehicle according to claim 3, wherein the arranging of the hydrogen concentration data detection point locations in the hydrogen leakage diffusion simulation model includes: arranging a detection point set at a place where the liquid hydrogen leakage diffusion cloud cluster possibly passes through, determining the diffusion trend of the liquid hydrogen leakage diffusion cloud cluster after multi-factor simulation, searching for a space intersection between the cloud clusters of each factor, changing the position of the detection point set, ensuring that the monitoring point set is contained in the space intersection of the cloud clusters of each factor, and determining a final detection point through multiple iterations.
Preferably, the multi-factor leakage simulation set result post-processing includes: and (4) performing transient simulation on the hydrogen leakage diffusion simulation model until the cloud cluster diffuses out of the calculation flow domain, and processing and analyzing the result through post-processing software to obtain the time-varying trend of the hydrogen cloud cluster.
Preferably, the judging whether the data curve of the simulation monitoring point is in accordance with the expectation includes: and judging whether the time of detecting the effective value of the hydrogen concentration by the detection point after the hydrogen leakage occurs is within the expected response time or not, analyzing whether the temperature of the detection point is within the acceptable range of the hydrogen concentration detection or not, and if the time of detecting the effective value of the hydrogen concentration is within the expected response time and the temperature is within the acceptable range of the hydrogen concentration detection, determining that the detection point is in line with the expectation.
In a second aspect, the present invention provides a hydrogen leakage diffusion monitoring system for a liquid hydrogen fuel cell vehicle, comprising:
the first acquisition module is used for acquiring hydrogen concentration data of a plurality of detection point positions; wherein the determination of the detection point position comprises: constructing a fluid domain by combining a model of the liquid hydrogen fuel cell automobile and the space environment; carrying out grid division on the constructed fluid domain and determining a hydrogen leakage diffusion simulation model; arranging hydrogen concentration data detection points in a hydrogen leakage diffusion simulation model, performing multi-factor leakage simulation set result post-processing, judging whether a data curve of a simulation monitoring point is in accordance with expectation, and if not, re-arranging the detection points until the data curve is in accordance with the expectation;
the second acquisition module is used for acquiring temperature data inside the liquid hydrogen storage and supply system;
the third acquisition module is used for acquiring pressure data inside the liquid hydrogen storage and supply system;
and the diagnosis module is used for performing multi-stage fault diagnosis according to the collected hydrogen concentration data, temperature data and pressure data, sending a buzzer alarm and sending a fault code to the vehicle control unit if a fault occurs, and the vehicle control unit controls the action electromagnetic valve to close the hydrogen supply pipeline.
In a third aspect, the present invention provides a computer device comprising a memory and a processor, the processor and the memory being in communication with each other, the memory storing program instructions executable by the processor, the processor invoking the program instructions to perform the hydrogen leakage diffusion monitoring method of a liquid hydrogen fuel cell vehicle as described above.
In a fourth aspect, the present invention provides an electronic device, comprising a memory and a processor, wherein the processor and the memory are in communication with each other, the memory stores program instructions executable by the processor, and the processor calls the program instructions to execute the hydrogen leakage diffusion monitoring method of the liquid hydrogen fuel cell automobile.
In a fifth aspect, the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the hydrogen leakage diffusion monitoring method for a liquid hydrogen fuel cell vehicle as described above.
The invention has the beneficial effects that: the installation point positions of the hydrogen concentration sensors are reasonably arranged by predicting the liquid hydrogen leakage diffusion with multiple influence factors through fluid mechanics simulation software, so that the response speed of the hydrogen leakage monitoring system is increased, the low-temperature hydrogen leakage monitoring performance is improved, and the accuracy and the adaptability of the liquid hydrogen leakage monitoring system are improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for determining a location of a hydrogen concentration sensor according to an embodiment of the present invention.
FIG. 2 is a diagram of a model of a defined enclosed space fluid domain according to an embodiment of the present invention.
Fig. 3 is a graph comparing simulation and experimental data of liquid hydrogen leakage according to an embodiment of the present invention.
Fig. 4 is a functional schematic frame diagram of a hydrogen leakage diffusion monitoring system of a liquid hydrogen fuel cell vehicle according to an embodiment of the present invention.
Fig. 5 is a flowchart of a hydrogen leakage diffusion monitoring method for a liquid hydrogen fuel cell vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by way of the drawings are illustrative only and are not to be construed as limiting the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
For the purpose of facilitating an understanding of the present invention, the present invention will be further explained by way of specific embodiments with reference to the accompanying drawings, which are not intended to limit the present invention.
It will be appreciated by those skilled in the art that the drawings are merely schematic representations of embodiments and that the elements in the drawings are not necessarily required to practice the present invention.
Example 1
In this embodiment 1, a hydrogen leakage diffusion monitoring system for a liquid hydrogen fuel cell vehicle is provided, which includes:
the first acquisition module is used for acquiring hydrogen concentration data of a plurality of detection points; wherein the determination of the detection point position comprises: constructing a fluid domain by combining a model of the liquid hydrogen fuel cell automobile and the space environment; carrying out grid division on the constructed fluid domain and determining a hydrogen leakage diffusion simulation model; arranging hydrogen concentration data detection points in a hydrogen leakage diffusion simulation model, performing multi-factor leakage simulation set result post-processing, judging whether a data curve of a simulation monitoring point is in accordance with expectation, and if not, re-arranging the detection points until the data curve is in accordance with the expectation;
the second acquisition module is used for acquiring temperature data inside the liquid hydrogen storage and supply system;
the third acquisition module is used for acquiring pressure data inside the liquid hydrogen storage and supply system;
and the diagnosis module is used for performing multi-stage fault diagnosis according to the collected hydrogen concentration data, temperature data and pressure data, sending a buzzer alarm and sending a fault code to the vehicle control unit if a fault occurs, and the vehicle control unit controls the action electromagnetic valve to close the hydrogen supply pipeline.
In this embodiment 1, the first obtaining module may specifically be a hydrogen concentration sensor, the second obtaining module may specifically be a temperature sensor, and the third obtaining module may specifically be a pressure sensor.
In embodiment 1, the method for monitoring hydrogen leakage and diffusion of a liquid hydrogen fuel cell vehicle by using the above system includes the following steps:
acquiring hydrogen concentration data of a plurality of detection points; wherein the determination of the detection point position comprises: constructing a fluid domain by combining a model of the liquid hydrogen fuel cell automobile and the space environment; carrying out grid division on the constructed fluid domain and determining a hydrogen leakage diffusion simulation model; arranging hydrogen concentration data detection points in a hydrogen leakage diffusion simulation model, performing multi-factor leakage simulation set result post-processing, judging whether a data curve of a simulation monitoring point is in accordance with expectation, and if not, re-arranging the detection points until the data curve is in accordance with the expectation;
acquiring temperature data inside the liquid hydrogen storage and supply system;
acquiring pressure data inside the liquid hydrogen storage and supply system;
and finally, performing multi-stage fault diagnosis according to the collected hydrogen concentration data, temperature data and pressure data, if a fault occurs, sending a buzzer alarm and sending a fault code to the vehicle control unit, and the vehicle control unit controls an action electromagnetic valve to close the hydrogen supply pipeline.
Wherein, combining the model of the liquid hydrogen fuel cell automobile and the space environment thereof to construct a fluid domain, comprising: obtaining a physical model of the liquid hydrogen fuel cell automobile and simplifying the physical model; and constructing a fluid domain according to the space environment of the liquid hydrogen fuel cell automobile.
The fluid domain is divided by adopting a structured grid, the grid near the leakage port is encrypted, a boundary layer grid is divided, and the size of the grid depends on the distance from the leakage port; a mixture model and a readable k-e turbulence model are adopted to simulate a two-phase multi-component flow process, and an evaporation-condensation model is adopted in an interphase mass transfer process.
Arranging hydrogen concentration data detection points in a hydrogen leakage diffusion simulation model, wherein the hydrogen concentration data detection points comprise: a detection point set is arranged at a place where the liquid hydrogen leakage diffusion cloud cluster possibly passes through, the diffusion trend of the liquid hydrogen leakage diffusion cloud cluster is determined after multi-factor (including wind speed, wind direction, ambient temperature and humidity, ground heat conductivity coefficient, leakage speed, leakage port position and the space where the leakage port is located is closed, semi-closed and open), the space intersection among the cloud clusters of all factors is searched, the position of the detection point set is changed, the monitoring point set is ensured to be contained in the space intersection of the cloud clusters of all factors, and the final detection point position is determined through multiple iterations.
And (3) carrying out multi-factor leakage simulation set result post-processing, comprising: the hydrogen leakage diffusion simulation model carries out transient simulation until the cloud cluster diffuses out of the computational flow domain, and the result is processed and analyzed through post-processing software (the post-processing software is the existing known software such as CFD-post, Tecplot) to obtain the trend of the hydrogen cloud cluster changing along with time.
Judging whether the data curve of the simulation monitoring point is in accordance with expectation or not, comprising the following steps: and judging whether the time of detecting the effective value of the hydrogen concentration by the detection point after the hydrogen leakage occurs is within the expected response time or not, analyzing whether the temperature of the detection point is within the acceptable range of the hydrogen concentration detection or not, and if the time of detecting the effective value of the hydrogen concentration is within the expected response time and the temperature is within the acceptable range of the hydrogen concentration detection, determining that the detection point is in line with the expectation.
Example 2
In this embodiment 2, a method for determining a detection point of a hydrogen concentration in liquid hydrogen leakage is provided, and a method and a system for monitoring liquid hydrogen leakage are provided, taking a heavy truck with a liquid hydrogen fuel cell as an example.
As shown in fig. 1, in this embodiment 2, the method for determining the detection point position of the hydrogen concentration in liquid hydrogen leakage specifically includes:
the method comprises the steps of determining a vehicle model and a space where the vehicle model is located to construct a fluid domain, wherein the fluid domain comprises the steps of obtaining a liquid hydrogen heavy truck physical model, simplifying the physical model, removing a structure which has small influence on a simulation result but has large influence on simulation calculation efficiency and precision, accelerating the simulation efficiency and saving calculation resources. And then constructing a fluid domain according to the space environment of the liquid hydrogen heavy truck, wherein the space environment is specifically divided into a closed space, a semi-closed space and an open space. Fig. 2 is a fluid domain constructed after the liquid hydrogen heavy truck is simplified when the liquid hydrogen heavy truck is in a closed space, and the fluid domain is composed of a liquid hydrogen heavy truck simplified model, a liquid hydrogen storage and supply system simplified model and a closed space fluid domain.
And secondly, dividing the grids and selecting a proper simulation model. Including high quality meshing of the constructed fluid domain and the use of accurate simulation models verified by experimental data. The method specifically comprises the steps of dividing a fluid domain by adopting a structured grid, carrying out grid encryption on the position near a leakage port, and dividing a boundary layer grid, wherein the size of the grid depends on the distance from the leakage port to the leakage port. Selecting a proper simulation model comprises selecting a proper boundary condition, a multiphase flow model and a turbulent flow model. Specifically, a mixture model and a Realizable k-e turbulence model (a turbulence model) are adopted to simulate a two-phase multi-component flow process, and an evaporation-condensation model is adopted in an interphase mass transfer process. The gas phase and the liquid phase are respectively considered as a single phase of a mixture in the mixture model, the gas phase is a mixture of air and hydrogen, the liquid phase is hydrogen, and for the gas phase or the liquid phase, all physical properties of the gas phase or the liquid phase are calculated by adopting the properties of the mixture, including a mixture continuity equation, a momentum equation, an energy equation and the like. It is assumed that there is no relative velocity of motion between the gas and liquid phases. The boundary conditions are that the leakage inlet is set as a mass flow inlet, the air inlet surface is set as a speed inlet, the downwind surface is set as a pressure outlet, the ground surface is set as a temperature wall surface, and other surfaces are smooth heat insulation wall surfaces. The simulation model in this embodiment 2 is verified by comparing a large-scale liquid hydrogen leakage experiment performed by the national aeronautics and astronautics administration (NASA) in 1981, and the verification result is shown in fig. 3, where fig. 3 is a comparison between experimental data of hydrogen concentration on a monitoring tower in the experiment and simulation data at the same position in the simulation model, and it can be seen that both the response time and the accuracy of the simulation data are within an acceptable error range, so the simulation model in this embodiment 2 is accurate.
And thirdly, arranging simulation data monitoring point positions in the liquid hydrogen leakage diffusion simulation. The method specifically comprises the steps of firstly arranging and installing monitoring point sets at places where liquid hydrogen leakage diffusion clouds may pass through, determining the diffusion trend of the hydrogen clouds after multi-factor simulation, searching for space intersection among the clouds of all factors, changing the positions of the monitoring point sets to ensure that the monitoring point sets are contained in the space intersection of the clouds of all factors, and determining the final installation point sets through multiple iterations.
And fourthly, after the point positions are arranged, performing multi-factor leakage simulation set result post-processing. Specifically, transient simulation is carried out for a long enough time until the cloud cluster is diffused out of a calculation flow domain, and the result is processed and analyzed through post-processing software to obtain the time-varying trend of the hydrogen cloud cluster.
And fifthly, judging whether the data curve of the simulation monitoring point is in accordance with expectation. Specifically, whether the time for monitoring the effective value of the hydrogen concentration sensor after leakage occurs at the installation point is within the expected response time or not is judged, whether the temperature of the monitoring point is within the acceptable range of the hydrogen concentration sensor or not is analyzed, and whether the monitoring point is in accordance with the expectation or not is judged by comprehensively considering the two factors. If not, returning to the third step iteration until the installation point is in accordance with the expectation.
In this embodiment 2, by using the above method for determining a hydrogen leakage hydrogen concentration detection point location, a reasonable and accurate hydrogen concentration sensor installation point location is obtained, and then a hydrogen leakage monitoring system is required to monitor each point data, so as to implement accurate and effective monitoring of liquid hydrogen leakage of the liquid hydrogen heavy truck, which includes the following specific steps:
as shown in fig. 4, the overall scheme design is performed on the hydrogen leakage monitoring system based on the modular design concept, and the whole liquid hydrogen leakage monitoring system mainly comprises a british flying ice TC1782 microcontroller minimum system, an analog quantity signal conditioning circuit, a CAN bus communication circuit, a solenoid valve driving circuit, a fault alarm circuit and the like. The Yingfeing TC1782 microcontroller is the core of the system, and is used for collecting and processing data, sending out a fault alarm and actuating the electromagnetic valve to close the liquid hydrogen storage and supply system pipeline. The analog quantity signal conditioning circuit is responsible for conditioning data signals of the hydrogen concentration sensor into signals which can be collected by the AD module of the controller. The controller collects the temperature and pressure signals inside the liquid hydrogen storage and supply system through the CAN bus communication circuit and sends fault codes to the whole vehicle controller. The electromagnetic valve driving circuit can control the electromagnetic valve to close the hydrogen supply pipeline of the liquid hydrogen storage and supply system. The fault alarm circuit can send out alarm buzzing sound to prompt personnel.
As shown in fig. 5, a microcontroller of the hydrogen leakage monitoring system collects the data of the hydrogen concentration sensor at each installation point through an AD module, collects the data of the temperature and pressure inside the liquid hydrogen storage and supply system through a CAN bus, performs fault diagnosis through a multi-stage early warning strategy, sends out a buzzer alarm and sends a fault code to a vehicle control unit if a fault occurs, and actuates a solenoid valve to close a hydrogen supply pipeline. The hydrogen leakage monitoring system adopts a multi-stage early warning strategy to carry out fault diagnosis on the liquid hydrogen storage and supply system and carries out fault grade division on the acquired signals in order to timely and accurately acquire fault information, mainly judges according to the relation between the current values of the parameters and the set threshold value, and has the characteristics of simplicity in operation, high reliability and stability and the like. And the hydrogen leakage monitoring system adopts corresponding fault treatment measures according to different fault grades to ensure the safe and stable operation of the liquid hydrogen storage and supply system.
Example 3
An embodiment 3 of the present invention provides an electronic device, including a memory and a processor, where the processor and the memory are in communication with each other, the memory stores a program instruction executable by the processor, and the processor calls the program instruction to execute a hydrogen leakage diffusion monitoring method for a liquid hydrogen fuel cell vehicle, where the method includes the following steps:
acquiring hydrogen concentration data of a plurality of detection points; wherein the determination of the detection point position comprises: constructing a fluid domain by combining a model of the liquid hydrogen fuel cell automobile and the space environment; performing mesh division on the constructed fluid domain and determining a hydrogen leakage diffusion simulation model; arranging hydrogen concentration data detection points in a hydrogen leakage diffusion simulation model, performing multi-factor leakage simulation set result post-processing, judging whether a data curve of a simulation monitoring point is in accordance with expectation, and if not, re-arranging the detection points until the data curve is in accordance with the expectation;
acquiring temperature data inside a liquid hydrogen storage and supply system;
acquiring pressure data inside the liquid hydrogen storage and supply system;
and performing multi-stage fault diagnosis according to the collected hydrogen concentration data, temperature data and pressure data, if a fault occurs, sending a buzzer alarm and sending a fault code to the vehicle control unit, and the vehicle control unit controls the action electromagnetic valve to close the hydrogen supply pipeline.
Example 4
An embodiment 4 of the present invention provides a computer-readable storage medium storing a computer program, where the computer program is executed by a processor to implement a hydrogen leakage diffusion monitoring method for a liquid hydrogen fuel cell vehicle, and the method includes the following steps:
acquiring hydrogen concentration data of a plurality of detection points; wherein the determination of the detection point position comprises: constructing a fluid domain by combining a model of the liquid hydrogen fuel cell automobile and the space environment; carrying out grid division on the constructed fluid domain and determining a hydrogen leakage diffusion simulation model; arranging hydrogen concentration data detection points in a hydrogen leakage diffusion simulation model, performing multi-factor leakage simulation set result post-processing, judging whether a data curve of a simulation monitoring point is in accordance with expectation, and if not, re-arranging the detection points until the data curve is in accordance with the expectation;
acquiring temperature data inside a liquid hydrogen storage and supply system;
acquiring pressure data inside the liquid hydrogen storage and supply system;
and performing multi-stage fault diagnosis according to the collected hydrogen concentration data, temperature data and pressure data, if a fault occurs, sending a buzzer alarm and sending a fault code to the vehicle control unit, and the vehicle control unit controls the action electromagnetic valve to close the hydrogen supply pipeline.
Example 5
Embodiment 5 of the present invention provides a computer device, including a memory and a processor, where the processor and the memory are in communication with each other, the memory stores a program instruction executable by the processor, and the processor calls the program instruction to execute a hydrogen leakage diffusion monitoring method for a liquid hydrogen fuel cell vehicle, where the method includes the following steps:
acquiring hydrogen concentration data of a plurality of detection points; wherein the determination of the detection point position comprises: constructing a fluid domain by combining a model of the liquid hydrogen fuel cell automobile and the space environment; carrying out grid division on the constructed fluid domain and determining a hydrogen leakage diffusion simulation model; arranging hydrogen concentration data detection points in a hydrogen leakage diffusion simulation model, performing multi-factor leakage simulation set result post-processing, judging whether a data curve of a simulation monitoring point is in accordance with expectation, and if not, re-arranging the detection points until the data curve is in accordance with the expectation;
acquiring temperature data inside the liquid hydrogen storage and supply system;
acquiring pressure data inside the liquid hydrogen storage and supply system;
and performing multi-stage fault diagnosis according to the collected hydrogen concentration data, temperature data and pressure data, sending a buzzing alarm and sending a fault code to the vehicle control unit if a fault occurs, and controlling an action solenoid valve to close a hydrogen supply pipeline by the vehicle control unit.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts based on the technical solutions disclosed in the present invention.
Claims (10)
1. A hydrogen leakage diffusion monitoring method of a liquid hydrogen fuel cell automobile is characterized by comprising the following steps:
acquiring hydrogen concentration data of a plurality of detection points; wherein the determination of the detection point position comprises: constructing a fluid domain by combining a model of the liquid hydrogen fuel cell automobile and the space environment; carrying out grid division on the constructed fluid domain and determining a hydrogen leakage diffusion simulation model; arranging hydrogen concentration data detection points in a hydrogen leakage diffusion simulation model, performing multi-factor leakage simulation set result post-processing, judging whether a data curve of a simulation monitoring point is in accordance with expectation, and if not, re-arranging the detection points until the data curve is in accordance with the expectation;
acquiring temperature data inside the liquid hydrogen storage and supply system;
acquiring pressure data inside the liquid hydrogen storage and supply system;
and performing multi-stage fault diagnosis according to the collected hydrogen concentration data, temperature data and pressure data, if a fault occurs, sending a buzzer alarm and sending a fault code to the vehicle control unit, and the vehicle control unit controls the action electromagnetic valve to close the hydrogen supply pipeline.
2. The method of claim 1, wherein the constructing a fluid domain in combination with a model of the liquid hydrogen fuel cell vehicle and the spatial environment thereof comprises: obtaining a physical model of the liquid hydrogen fuel cell automobile and simplifying the physical model; and constructing a fluid domain according to the space environment of the liquid hydrogen fuel cell automobile.
3. The hydrogen leakage diffusion monitoring method of the liquid hydrogen fuel cell vehicle according to claim 2, characterized in that a fluid domain is divided by adopting a structured grid, grid encryption is carried out near a leakage port, boundary layer grids are divided, and the size of the grids depends on the distance from the leakage port; a mixture model and a readable k-e turbulence model are adopted to simulate a two-phase multi-component flow process, and an evaporation-condensation model is adopted in an interphase mass transfer process.
4. The hydrogen leakage diffusion monitoring method of the liquid hydrogen fuel cell vehicle according to claim 3, wherein arranging hydrogen concentration data detection points in a hydrogen leakage diffusion simulation model includes: arranging a detection point set at a place where the liquid hydrogen leakage diffusion cloud cluster possibly passes through, determining the diffusion trend of the liquid hydrogen leakage diffusion cloud cluster after multi-factor simulation, searching for a space intersection between the cloud clusters of each factor, changing the position of the detection point set, ensuring that the monitoring point set is contained in the space intersection of the cloud clusters of each factor, and determining a final detection point through multiple iterations.
5. The hydrogen leakage diffusion monitoring method of the liquid hydrogen fuel cell vehicle as claimed in claim 4, wherein the multi-factor leakage simulation set result post-processing is performed and comprises: and performing transient simulation on the hydrogen leakage diffusion simulation model until the cloud cluster diffuses out of the calculation flow domain, and processing and analyzing the result through post-processing software to obtain the time-varying trend of the hydrogen cloud cluster.
6. The hydrogen leakage diffusion monitoring method of the liquid hydrogen fuel cell vehicle according to claim 5, wherein judging whether the data curve of the simulation monitoring point is in accordance with the expectation comprises: and judging whether the time of detecting the effective value of the hydrogen concentration by the detection point after the hydrogen leakage occurs is within the expected response time or not, analyzing whether the temperature of the detection point is within the acceptable range of the hydrogen concentration detection or not, and if the time of detecting the effective value of the hydrogen concentration is within the expected response time and the temperature is within the acceptable range of the hydrogen concentration detection, determining that the detection point is in line with the expectation.
7. A hydrogen leakage diffusion monitoring system of a liquid hydrogen fuel cell vehicle, comprising:
the first acquisition module is used for acquiring hydrogen concentration data of a plurality of detection point positions; wherein the determination of the detection point position comprises: constructing a fluid domain by combining a model of the liquid hydrogen fuel cell automobile and the space environment; carrying out grid division on the constructed fluid domain and determining a hydrogen leakage diffusion simulation model; arranging hydrogen concentration data detection points in a hydrogen leakage diffusion simulation model, performing multi-factor leakage simulation set result post-processing, judging whether a data curve of a simulation monitoring point is in accordance with expectation, and if not, re-arranging the detection points until the data curve is in accordance with the expectation;
the second acquisition module is used for acquiring temperature data inside the liquid hydrogen storage and supply system;
the third acquisition module is used for acquiring pressure data inside the liquid hydrogen storage and supply system;
and the diagnosis module is used for performing multi-stage fault diagnosis according to the collected hydrogen concentration data, temperature data and pressure data, sending a buzzer alarm and sending a fault code to the vehicle control unit if a fault occurs, and the vehicle control unit controls the action electromagnetic valve to close the hydrogen supply pipeline.
8. A computer device comprising a memory and a processor, the processor and the memory being in communication with each other, the memory storing program instructions executable by the processor, the processor invoking the program instructions to perform a hydrogen leak diffusion monitoring method of a liquid hydrogen fuel cell vehicle as defined in any one of claims 1-6.
9. An electronic device, comprising a memory and a processor, wherein the processor and the memory are in communication with each other, wherein the memory stores program instructions executable by the processor, and the processor invokes the program instructions to perform the hydrogen leakage diffusion monitoring method for a liquid hydrogen fuel cell vehicle according to any one of claims 1 to 6.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when executed by a processor, implements the hydrogen leakage diffusion monitoring method of a liquid hydrogen fuel cell vehicle according to any one of claims 1 to 6.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116646565A (en) * | 2023-07-26 | 2023-08-25 | 广东电网有限责任公司广州供电局 | Fault detection method and device for fuel cell, storage medium and fuel cell |
| CN117740256A (en) * | 2024-02-19 | 2024-03-22 | 中汽研新能源汽车检验中心(天津)有限公司 | Hydrogen leakage point monitoring and positioning method and device for fuel cell heavy truck |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116646565A (en) * | 2023-07-26 | 2023-08-25 | 广东电网有限责任公司广州供电局 | Fault detection method and device for fuel cell, storage medium and fuel cell |
| CN116646565B (en) * | 2023-07-26 | 2023-11-21 | 广东电网有限责任公司广州供电局 | Fault detection method and device for fuel cell, storage medium and fuel cell |
| CN117740256A (en) * | 2024-02-19 | 2024-03-22 | 中汽研新能源汽车检验中心(天津)有限公司 | Hydrogen leakage point monitoring and positioning method and device for fuel cell heavy truck |
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