Method and device for determining duration of airtight detection process

Abstract

The invention discloses a method and a device for determining airtight detection process duration, and relates to the technical field of airtight detection. According to the scheme, the method comprises the following steps: constructing an equivalent cavity graphic model of a to-be-tested electric control cavity; constructing a leak detection graphic model; the leakage detection graphic model comprises a standard cavity graphic model, an airtight leakage detection equipment graphic model and an electric control leakage graphic model; the airtight leakage detection equipment graphic model is respectively connected with the standard cavity graphic model and the electric control leakage graphic model; the electric control leakage graphic model is a graphic model for adding a leakage hole on the equivalent cavity graphic model; in response to a preset simulation parameter, performing airtight detection process simulation through the leakage detection graphic model, so that the airtight leakage detection equipment graphic model performs inflation simulation on the standard cavity graphic model and the electric control leakage graphic model respectively, and outputs a simulation result; and determining target process duration information based on the simulation result. The method can save the cost of experimental samples and improve the production efficiency.

Description

Technical Field

[0001] The present invention relates to the field of airtightness detection technology, and more specifically, to a method and device for determining the duration of an airtightness detection process. Background Art

[0002] The electronic control assembly is the core component responsible for power control and management in new energy vehicles. It integrates multiple key components such as motor controller, high-voltage distribution box, DC-DC voltage converter, leakage sensor module, etc. It is responsible for controlling high-voltage AC / DC bidirectional inverter, driving motor operation and charging and discharging functions, while supplying power to the vehicle's low-voltage electrical system, and realizing the power distribution function of the vehicle's high-voltage circuit and high-voltage leakage detection function, so as to achieve efficient, safe and stable operation of the vehicle.

[0003] The electronic control cavity, as the physical carrier of the electronic control assembly, provides a closed space or housing for the electronic components in the electronic control system, protects the internal electrical components from the influence of the external environment such as dust, moisture, temperature fluctuations, etc., and ensures the reliability and durability of the electronic control system. After the electronic control cavity is assembled, the shell may be deformed due to the casting deviation of the shell or the axial force of the bolts, or there may be gaps in the joint surface due to the displacement of the sealing ring, poor sealing, water ingress into the cavity, water leakage in the waterway after going offline, etc., which will cause the electronic control assembly to fail. Therefore, an airtightness detection process is generally set up on the production line to detect the airtightness of the electronic control cavity, timely discover the problem of poor sealing, and reduce the market failure rate.

[0004] The airtightness detection process includes multiple key test parameters such as test method, test pressure, and test process duration, among which the test process duration is a key parameter. In order to control costs and improve production efficiency while ensuring quality, it is necessary to reduce the test process duration as much as possible on the basis of effectively identifying sealing problems. However, the current test duration is mostly set using the universal duration recommended by airtightness detection equipment manufacturers, which is too broad and cannot accurately match the airtightness detection of electronic control cavities of various volumes. In addition, the process of trial production followed by experimental verification is generally adopted, which requires repeated adjustment of the process duration and a large number of samples, which is costly, inefficient, and affects the production rhythm. Summary of the invention

[0005] In view of this, the present invention provides a method and device for determining the duration of an airtight detection process, which can reduce the number of experimental samples, save a large amount of sample costs, and improve production efficiency.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] In a first aspect, the present invention provides a method for determining the duration of an airtightness detection process, the method comprising:

[0008] Construct an equivalent cavity graphic model of the electronically controlled cavity to be tested;

[0009] Constructing a graphical model for leak detection;

[0010] Among them, the leak detection graphic model includes a standard cavity graphic model, a gas-tight leak detection equipment graphic model, and an electric control leakage graphic model;

[0011] The graphic model of the airtight leak detection equipment is connected to the standard cavity graphic model and the electronically controlled leakage graphic model respectively;

[0012] The electronically controlled leakage graphic model is a graphic model in which leakage holes are added to the equivalent cavity graphic model;

[0013] The aperture of the leakage hole is determined by the original maximum allowable leakage and the first pressure difference between the standard cavity graphic model and the electronically controlled leakage graphic model;

[0014] In response to preset simulation parameters, the airtight detection process is simulated through the leak detection graphic model, so that the airtight leak detection equipment graphic model respectively performs inflation simulation on the standard cavity graphic model and the electric control leakage graphic model, and outputs the simulation results;

[0015] The simulation results include the corresponding relationship data between the internal pressure and internal temperature of the electronically controlled leakage graphic model detected by the airtight leak detection equipment graphic model and time;

[0016] Determine the target process duration information based on the simulation results.

[0017] The method provided by the present invention constructs an equivalent cavity graphic model corresponding to the electric control cavity to be tested, and adds leakage holes on the equivalent cavity graphic model to simulate the electric control leakage graphic model of flow leakage, and jointly constructs a leakage detection graphic model with the standard cavity graphic model and the airtight leak detection equipment graphic model corresponding to the electric control cavity to be tested, so as to accurately restore the leak detection system for detecting the airtightness of the electric control cavity to be tested, and directly optimizes the airtight detection process duration of the electric control cavity to be tested through the simulation result of the leakage detection graphic model, avoiding repeated adjustment of the process duration by trial production and then experimental verification, thereby reducing the number of experimental samples, saving a large amount of sample costs, and improving production efficiency.

[0018] In a possible implementation, the aperture of the leakage hole is obtained by:

[0019] Obtain the original maximum allowable leakage and the original design detection process duration;

[0020] Substitute the original maximum allowable leakage and the original design detection process duration into the preset equivalent volume formula to calculate the first pressure difference;

[0021] The equivalent volume formula is:

[0022]

[0023] Where Q is the leakage volume in ml / min; ΔP is the pressure difference in Pa; V e is the equivalent internal volume in milliliters; T is the duration of the detection process in seconds;

[0024] The electronically controlled leakage graphic model is automatically optimized based on the first pressure difference, and the aperture of the leakage hole is calculated.

[0025] In a possible implementation, automatically optimizing the electronically controlled leakage graphic model based on the first pressure difference to calculate the aperture of the leakage hole includes:

[0026] The first pressure difference is taken as the target and the aperture of the leakage hole is taken as the parameter to be optimized to seek the optimal solution.

[0027] In a possible implementation, the target process duration information includes a target charging process duration, a target pressure holding process duration, and a target detection process duration; and determining the target process duration information based on the simulation results includes:

[0028] The product of the first process duration and the preset safety factor is determined as the target pressurization process duration; wherein the first process duration is the time taken by the airtight leak detection equipment graphic model to inflate the electric control leakage graphic model so that the internal pressure of the electric control leakage graphic model reaches the target pressurization pressure;

[0029] The duration of the second process is determined as the target pressure-maintaining process duration; wherein the start time of the second process duration is the time when the internal pressure of the electronically controlled leakage graphic model reaches the target charging pressure, and the end time of the second process duration is the time when the internal temperature of the electronically controlled leakage graphic model is the same as the external ambient temperature;

[0030] Calculate the difference between the total duration of the target process and the duration of the third process so that the duration of the target detection process is not greater than the difference; wherein the duration of the third process is the sum of the duration of the target charging process and the duration of the target pressure holding process.

[0031] In a possible implementation, the simulation result also includes a pressure difference time curve for reflecting the relationship between the detection process duration and the second pressure difference; the second pressure difference is the internal pressure difference between the standard cavity graphic model and the electronically controlled leakage graphic model detected by the airtight leak detection equipment graphic model; after determining the target process duration information based on the simulation result, it also includes:

[0032] Query the second pressure difference corresponding to the target detection process duration based on the pressure difference time curve;

[0033] Substitute the second pressure difference corresponding to the target detection process duration and the target detection process duration into the equivalent volume formula to calculate the target maximum allowable leakage.

[0034] In a possible implementation, constructing an equivalent cavity graphic model of the electronically controlled cavity to be tested includes:

[0035] Acquire a model of the electrically controlled cavity to be tested, and acquire the volume and surface area of ​​the electrically controlled cavity to be tested based on the model of the electrically controlled cavity to be tested;

[0036] Based on the volume and surface area of ​​the electronically controlled cavity to be tested, an equivalent cavity graphic model is constructed.

[0037] In a second aspect, the present invention provides a device for determining the duration of an airtight detection process, the device comprising: a first model building module, a second model building module, a simulation module and a duration determination module; wherein:

[0038] A first model building module, connected to the second model building module, is used to build an equivalent cavity graphic model of the electric control cavity to be tested;

[0039] The second model building module is connected to the first model building module and the simulation module respectively, and is used to build a leak detection graphic model; wherein the leak detection graphic model includes a standard cavity graphic model, an airtight leak detection device graphic model and an electric-controlled leakage graphic model; the airtight leak detection device graphic model is connected to the standard cavity graphic model and the electric-controlled leakage graphic model respectively; the electric-controlled leakage graphic model is a graphic model in which a leakage hole is added to the equivalent cavity graphic model; the aperture of the leakage hole is determined by the original maximum allowable leakage and the first pressure difference between the standard cavity graphic model and the electric-controlled leakage graphic model;

[0040] A simulation module, connected to the second model building module and the duration determination module respectively, for simulating the airtight detection process through the leak detection graphic model in response to preset simulation parameters, so that the airtight leak detection equipment graphic model respectively performs inflation simulation on the standard cavity graphic model and the electric control leakage graphic model, and outputs simulation results; wherein the simulation results include the corresponding relationship data of the internal pressure and internal temperature of the electric control leakage graphic model detected by the airtight leak detection equipment graphic model and time;

[0041] The duration determination module is connected to the simulation module and is used to determine the target process duration information based on the simulation results.

[0042] In a third aspect, the present invention provides an electronic device comprising a processor and a memory; the memory stores a computer program or computer instructions that can be loaded by the processor and execute a method for determining the duration of an airtight detection process such as the first aspect and any possible implementation thereof.

[0043] In a fourth aspect, the present invention provides a computer-readable storage medium, which stores a computer program or computer instructions that can be loaded by a processor and execute a method for determining the duration of an airtight detection process such as the first aspect and any possible implementation thereof.

[0044] In a fifth aspect, the present invention provides a computer program product, including a computer program or computer instructions, which, when loaded and executed by a processor, implement the steps of a method for determining the duration of an airtight detection process as in the first aspect and any possible implementation thereof.

[0045] For the specific description of the second to fifth aspects and their various implementations in the present invention, reference can be made to the detailed description in the first aspect and its various implementations; and for the beneficial effects of the second to fifth aspects and their various implementations, reference can be made to the analysis of the beneficial effects in the first aspect and its various implementations, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0047] Figure 1 is a schematic diagram of the principle of a leak detection system according to an embodiment of the present invention;

[0048] Figure 2 It is a flowchart of a method for determining the duration of an airtightness detection process according to an embodiment of the present invention;

[0049] Figure 3 is a simulation schematic diagram of a leak detection graphic model according to an embodiment of the present invention;

[0050] Figure 4 It is a schematic diagram of a calculation process of the leakage hole diameter of the electronically controlled leakage graphic model in a method for determining the duration of an airtight detection process according to an embodiment of the present invention;

[0051] Figure 5 is a schematic diagram of a pressure difference time curve of an embodiment of the present invention;

[0052] Figure 6 This is a block diagram of the internal structure of a device for determining the duration of an airtight detection process according to an embodiment of the present invention;

[0053] Figure 7 It is a block diagram of the internal structure of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0054] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0055] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0056] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0057] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0058] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0059] In the following, the terms "first", "second", etc. indicate the number of technical features. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0060] The airtightness test process is divided into three steps: pressurization, pressure maintenance, and detection. The leakage of the cavity is generally very small and unstable. It is difficult for equipment and instruments to directly measure the leakage flow. Therefore, it is necessary to evaluate it by converting the pressure change into flow leakage, that is, slowly filling the electric control cavity to be tested and the standard electric control cavity (that is, the electric control cavity that meets the sealing standard) with gas to the test pressure at the same time, and comparing the pressures of the two. Since the atmospheric pressure changes with the seasons and weather, the direct reading of the pressure will have large fluctuations, so it is necessary to use leak detection equipment to detect the pressure difference between the electric control cavity to be tested and the standard electric control cavity as the basis for leakage analysis.

[0061] Therefore, this embodiment designs a leak detection system, please refer to Figure 1 , which is a schematic diagram of the principle of the leak detection system provided by an embodiment of the present invention. Figure 1 As shown, the leak detection system consists of a leak detection device, a test object (electric control cavity to be tested), and a standard product (standard electric control cavity). The leak detection device is mainly composed of a test pressure source, a pipeline, a differential pressure gauge, etc. The differential pressure gauge is respectively connected to the test object and the standard product.

[0062] By testing the pressure source, the pressure of the object to be measured and the standard product is restarted to a stable pressure at the same time. After the pressure is balanced, the differential pressure gauge uses the standard product as a reference to sense the object to be measured (vacuum degree), which can be converted into the leakage rate of the object to be measured.

[0063] Embodiment 1:

[0064] Based on the above leak detection system, an embodiment of the present invention provides a method for determining the duration of an airtight detection process, which is executed by an electronic device, which may be a desktop computer, a tablet computer, a smart phone, a laptop computer, etc., and this embodiment does not specifically limit this.

[0065] Please refer to Figure 2 , which is a flow chart of a method for determining the duration of an airtightness detection process provided by an embodiment of the present invention. Figure 2 As shown, the method for determining the duration of the airtight detection process provided by the present invention mainly includes the following steps (steps S201 to S204):

[0066] Step S201, constructing an equivalent cavity graphic model of the electric control cavity to be tested;

[0067] Step S202, constructing a leak detection graphic model; wherein the leak detection graphic model includes a standard cavity graphic model, an airtight leak detection equipment graphic model, and an electric-controlled leakage graphic model, and the electric-controlled leakage graphic model is a graphic model in which a leakage hole is added to the equivalent cavity graphic model;

[0068] Step S203, in response to preset simulation parameters, the airtight detection process is simulated through the leak detection graphic model, so that the airtight leak detection equipment graphic model respectively performs inflation simulation on the standard cavity graphic model and the electric control leakage graphic model, and outputs the simulation results;

[0069] Step S204, determining target process duration information based on the simulation results.

[0070] Reference Figure 1 The principle of the leak detection system shown in the figure is to construct the standard cavity graphic model, the airtight leak detection equipment graphic model and the equivalent cavity graphic model corresponding to each part of the leak detection system, respectively, to form a complete leak detection graphic model. Specifically, the standard cavity graphic model is a simulation model of the standard product, i.e., the equipment's own non-leaking reference cavity, the equivalent cavity graphic model is a simulation model of the object to be tested, i.e., the electronic control cavity to be tested, and the airtight leak detection equipment graphic model is a simulation model of the airtight leak detection equipment including components such as the test pressure source, valves, pipelines and differential pressure gauges.

[0071] The graphic model of the airtight leak detection equipment is connected to the standard cavity graphic model and the electric-controlled leakage graphic model respectively, and is used to inflate the standard cavity graphic model and the electric-controlled leakage graphic model respectively during the simulation stage, and detect the internal pressure, internal temperature, internal pressure difference and other data of the standard cavity graphic model and the electric-controlled leakage graphic model.

[0072] Since there are many types of electric control cavities to be tested, and some of their internal cavity structures are even irregular, an equivalent cavity graphic model that can be applied to multiple types of electric control cavities to be tested is used. The equivalent cavity graphic model can accurately restore the internal cavity structure characteristics of the electric control cavity to be tested, that is, convert the original complex cavity structure of the electric control cavity to be tested into a simple cavity structure.

[0073] In some optional embodiments, for step S201, the electrically-controlled cavity model of the electrically-controlled cavity to be tested is first obtained, and the volume and surface area of ​​the electrically-controlled cavity to be tested are obtained based on the electrically-controlled cavity model; then, based on the volume and surface area of ​​the electrically-controlled cavity to be tested, an equivalent cavity graphic model is constructed.

[0074] The acquisition of the model of the electric control cavity to be tested and the volume and surface area of ​​the electric control cavity to be tested can be achieved through NX software. Specifically, the electric control digital model assembly of the electric control cavity to be tested is imported into NX, and a body is created at the channel opening where the shell is connected to the outside to block it; all the solid structures of the assembly and the created body are merged into one unit; the extraction of geometric features function in the surface module is applied, and the internal cavity surface is extracted, and then the stitching function is applied to stitch the internal surface into solid geometry; the measurement body and measurement surface functions in NX are applied to directly measure the volume and surface area of ​​the electric control cavity to be tested.

[0075] In some optional embodiments, after obtaining the volume and surface area of ​​the electric control cavity to be tested, a simulation platform software such as Amesim can be used to construct an equivalent cavity graphic model of the electric control cavity model to be tested. Specifically, a cavity model is created in the Amesim software (a new model can be customized or a ready-made model can be directly selected), the volume, surface area, physical, chemical and other attribute parameters of the model are defined, the corresponding control logic is configured for the cavity model, and the initial conditions (such as initial temperature, pressure, etc.) are set.

[0076] It should be noted that the standard electric control cavity and the electric control cavity to be tested belong to the same type of electric control cavity, that is, they have the same characteristics in design, function, size, material, control method, performance standard, functional purpose, etc. The standard electric control cavity fully meets the product quality standards (including airtightness test standards). The construction of the standard cavity graphic model can also refer to the construction of the equivalent cavity graphic model, which will not be repeated here.

[0077] Of course, the construction of the graphic model of the airtight leak detection equipment can also be based on simulation platform software such as Amesim. For details, please refer to the construction of the equivalent cavity graphic model, which will not be repeated here.

[0078] After obtaining the standard cavity graphic model, the airtight leak detection equipment graphic model and the equivalent cavity graphic model, the models are connected through interfaces, and all connections are made to meet physical and logical requirements.

[0079] In step S203, after each model is constructed, the user inputs or modifies various simulation parameters through the parameter setting panel of each component in the model. The simulation parameters can be information such as target charging pressure, ambient temperature, simulation time step, total simulation time, accuracy requirements, etc. After setting the simulation parameters related to the airtightness detection process, click the Run button to start the simulation.

[0080] In this embodiment, the simulation results include the corresponding relationship data between the internal pressure and internal temperature of the electric control leakage graphic model detected by the airtight leak detection equipment graphic model and time. The target process duration information can be determined according to the simulation results.

[0081] Furthermore, in order to shorten and optimize the airtightness detection process, it is necessary to convert the equivalent cavity graphic model into an electrically controlled leakage graphic model that allows the maximum leakage. In order to simplify the model, leakage holes, such as round holes and square holes, can be added to the equivalent cavity graphic model. The aperture size of the leakage hole is directly related to the original maximum allowable leakage, and finally an electrically controlled leakage graphic model is formed to simulate the flow leakage of the electrically controlled cavity to be tested.

[0082] In this way, during the simulation process of the electric control leakage model designed based on the maximum allowable leakage, the duration of each airtightness detection process determined is the maximum duration, that is, the airtightness detection process of the electric control cavity to be tested within the maximum allowable leakage, the duration of each process must be less than the duration determined in the above simulation process. Using the process duration determined by the simulation to guide the airtightness detection process of the electric control cavity to be tested can shorten the duration of the entire airtightness detection process.

[0083] Figure 3 FIG. 1 shows a simulation schematic diagram of a leak detection graphical model. Figure 3 As shown, the leak detection graphic model includes a standard cavity graphic model 31, an electric-controlled leakage graphic model 32 and an airtight leak detection equipment graphic model. The airtight leak detection equipment graphic model includes a pipeline cavity model 33, a controller model 34, a pressure source model 35, four pressure sensor models P, an ambient temperature model k and a leakage sensor model m.

[0084] After the simulation starts, the pressure source model 35 starts to inflate the leak detection graphic model. The controller model 34 has ports A and B. Through port B, valve opening control instructions are sent to ports B1, B2, B3 and B4 respectively to control the opening of valves at various locations and enter the pressurization process. A pressure sensor P is set at each of the standard cavity graphic model 31, the electronically controlled leakage graphic model 32 and the pipeline cavity model 33. Port A reads the pressure data obtained by the pressure sensor P at the pipeline cavity model 33 and feeds it back to the controller model 34 in real time.

[0085] The pressure data obtained by the pressure sensor P at the electronically controlled leakage pattern model 32 can monitor whether the electronically controlled leakage pattern model 32 reaches the target charging pressure. When the target charging pressure is reached, port B sends valve closing control instructions to ports B1, B2, B3 and B4 respectively to control the valves at each location to close, stop the charging process, and enter the pressure holding process at the same time.

[0086] In the detection process, the pressure data obtained by the pressure sensor P at the standard cavity pattern model 31 and the electric control leakage pattern model 32 can be used to calculate the pressure difference between the standard cavity pattern model 31 and the electric control leakage pattern model 32. The leakage sensor model m can detect the leakage of the electric control leakage pattern model 32.

[0087] Through simulation, the leakage curve of the maximum allowable leakage is calculated, and according to the leakage trend line, the duration of the leak detection process within the allowable error range is selected. In the established leak detection graphical model, the cavity volume is set as the DOE parameter, 0.5L-15L volume, 0.5L interval, a total of 29 groups of parameters, and the charging stage is simulated to compare the difference in charging time for each group.

[0088] In this embodiment, the target process duration information includes the target charging process duration, the target pressure-holding process duration and the target detection process duration; the target process duration information refers to the target charging process duration determined by simulating the leak detection graphic model, which is less than the original design charging process duration, the target pressure-holding process duration is less than the original design pressure-holding process duration, and the target detection process duration is less than the original design pressure-holding process duration.

[0089] An equivalent cavity graphic model corresponding to the electric control cavity to be tested is constructed, and an equivalent circular hole model is added to the equivalent cavity graphic model to simulate the electric control leakage graphic model of flow leakage. A leak detection graphic model that can be accurately restored is constructed together with the standard cavity graphic model corresponding to the electric control cavity to be tested and the airtight leak detection equipment graphic model. The simulation results of the leak detection graphic model are used to directly optimize the duration of the airtight detection process of the electric control cavity to be tested, and optimized basic leak detection parameter targets are provided in the first stage of product design simulation. The model is verified and calibrated in the production stage. Finally, the optimization ratio can be adjusted according to the actual production quality. Therefore, the number of experimental samples can be reduced, a large amount of sample costs can be saved, and production efficiency can be improved.

[0090] Embodiment 2:

[0091] For the calculation method of the leakage hole diameter in the electronically controlled leakage graphic model involved in the method for determining the duration of the airtight detection process provided in the first embodiment, reference can be made to Figure 4 .like Figure 4 As shown, the calculation method mainly includes the following steps (steps S401 to S403):

[0092] Step S401, obtaining the original maximum allowable leakage and the original designed detection process duration;

[0093] Step S402, substituting the original maximum allowable leakage and the original designed detection process duration into a preset equivalent volume formula to calculate a first pressure difference;

[0094] Step S403: Automatically optimize the electronically controlled leakage pattern model based on the first pressure difference to calculate the aperture of the leakage hole.

[0095] In step S402, the equivalent volume formula is:

[0096]

[0097] Where Q is the leakage volume in ml / min; ΔP is the pressure difference in Pa; V e is the equivalent internal volume in milliliters; T is the duration of the detection process in seconds;

[0098] In this embodiment, the aperture of the leakage hole is calculated based on the maximum leakage standard allowed by the design of the electronic control cavity to be tested. The maximum leakage standard generally refers to the leakage amount within the detection time Δt1 being less than Q1 under the test pressure P0, that is, the maximum leakage standard involves three parameters: the original maximum allowable leakage amount, the original design detection process duration and the original design test pressure. When the original design test pressure remains unchanged, it is necessary to optimize the two parameters of the original maximum allowable leakage amount and the original design detection process duration. In other words, the aperture of the leakage hole should be calculated based on these two parameters.

[0099] In step S403, the first pressure difference is used as the target, and the aperture of the leakage hole is used as the parameter to be optimized to perform optimization. Specifically, an optimization method such as a genetic algorithm, a particle swarm optimization algorithm, a gradient descent method, etc. can be used for automatic optimization, which is not specifically limited in this embodiment.

[0100] Embodiment three:

[0101] After simulating the leak detection graphic model through the above embodiment, the target charging process time, the target pressure holding process time and the target detection process time are determined according to the simulation results.

[0102] The target charging process duration can be obtained by multiplying the first process duration by a preset safety factor, wherein the first process duration is the time taken for the airtight leak detection equipment graphic model to inflate the electronically controlled leakage graphic model so that the internal pressure of the electronically controlled leakage graphic model reaches the target charging pressure.

[0103] After comparing a large amount of simulation data, the charging process can reach the target charging pressure within 2 seconds.

[0104] It should be noted that the initial pressure of the leak detection graphic model is generally set to atmospheric pressure. The target charging pressure is the maximum pressure level that can be reached by the layout environment of the electronic control cavity to be tested. The higher the pressure, the higher the safety factor after the electronic control cavity to be tested reaches the standard. On the contrary, the lower the pressure, the lower the safety factor. The preset safety factor is the industry general safety factor, such as 1.2.

[0105] For the target pressure holding process duration, since the temperature rises due to air compression, the heat dissipation needs to be stabilized. After the pressure is completed, the heat transfer coefficient is input into the surface of the electric control cavity to be tested and the surface of the standard electric control cavity to simulate the heat dissipation and calculate using the convection heat transfer model. Specifically, the target pressure holding process duration is the second process duration. The starting time of the second process duration is the time when the internal pressure of the electric control leakage graphic model reaches the target pressure, and the end time of the second process duration is the time when the internal temperature of the electric control leakage graphic model is the same as the external ambient temperature.

[0106] It should be noted that the duration of the first process and the target holding pressure process can be used as simulation output parameters and directly output after the simulation is completed.

[0107] The target detection process duration can be calculated by combining the target process total duration with the target charging process duration and the target pressure holding process duration obtained by the above simulation, that is, the target detection process duration is not greater than the difference between the target process total duration and the third process duration; wherein the third process duration is the sum of the target charging process duration and the target pressure holding process duration. In other words, the sum of the target detection process duration, the target charging process duration, and the target pressure holding process duration cannot be greater than the target process total duration.

[0108] Through the model simulation method of this embodiment, the number of experimental samples is reduced, a large amount of sample cost is saved, the duration of the entire process can be shortened by 50%, and the efficiency can be increased by 1 times.

[0109] Furthermore, after determining the target detection process duration, it is also necessary to determine the target maximum allowable leakage amount based on the target detection process duration to improve and optimize the maximum leakage standard.

[0110] Specifically, the simulation results also include a pressure difference time curve (such as Figure 5 The second pressure difference is the internal pressure difference between the standard cavity graphic model and the electric control leakage graphic model detected by the airtight leak detection equipment graphic model. The second pressure difference corresponding to the target detection process duration is queried based on the pressure difference time curve; the second pressure difference corresponding to the target detection process duration and the target detection process duration are substituted into the equivalent volume formula to calculate the target maximum allowable leakage.

[0111] Embodiment 4:

[0112] Based on the same inventive concept, an embodiment of the present invention also provides a device for determining the duration of an airtight detection process for implementing the method for determining the duration of an airtight detection process involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of one or more devices for determining the duration of an airtight detection process provided below can refer to the limitations of the method for determining the duration of an airtight detection process above, and will not be repeated here.

[0113] Figure 6 FIG. 6 shows a structural block diagram of a device 600 for determining the duration of an airtight detection process. Figure 6 As shown, the airtight detection process duration determination device 600 includes: a first model construction module 601, a second model construction module 602, a simulation module 603 and a duration determination module 604; wherein,

[0114] The first model building module 601 is connected to the second model building module 602 and is used to build an equivalent cavity graphic model of the electric control cavity to be tested;

[0115] The second model building module 602 is connected to the first model building module 601 and the simulation module 603, respectively, and is used to build a leak detection graphic model; wherein the leak detection graphic model includes a standard cavity graphic model, an airtight leak detection device graphic model, and an electric-controlled leakage graphic model; the airtight leak detection device graphic model is connected to the standard cavity graphic model and the electric-controlled leakage graphic model respectively; the electric-controlled leakage graphic model is a graphic model in which a leakage hole is added to the equivalent cavity graphic model; the aperture of the leakage hole is determined by the original maximum allowable leakage and the first pressure difference between the standard cavity graphic model and the electric-controlled leakage graphic model;

[0116] The simulation module 603 is connected to the second model building module 602 and the duration determination module 604 respectively, and is used to simulate the airtight detection process through the leak detection graphic model in response to the preset simulation parameters, so that the airtight leak detection equipment graphic model can respectively perform inflation simulation on the standard cavity graphic model and the electric control leakage graphic model, and output the simulation results; wherein the simulation results include the corresponding relationship data of the internal pressure and internal temperature of the electric control leakage graphic model detected by the airtight leak detection equipment graphic model and time;

[0117] The duration determination module 604 is connected to the simulation module 603 and is used to determine the target process duration information based on the simulation result.

[0118] In some optional embodiments, the second model building module 602 includes: an acquisition submodule, a substitution submodule, a model building submodule, an automatic optimization submodule, and an application submodule;

[0119] The acquisition submodule is connected with the substitution submodule and is used to obtain the original maximum allowable leakage and the original design detection process duration;

[0120] The substitution submodule is connected to the acquisition submodule and the automatic optimization submodule respectively, and is used to substitute the original maximum allowable leakage and the original design detection process duration into a preset equivalent volume formula to calculate the first pressure difference;

[0121] The equivalent volume formula is:

[0122]

[0123] Where Q is the leakage volume in ml / min; ΔP is the pressure difference in Pa; V e is the equivalent internal volume in milliliters; T is the duration of the detection process in seconds;

[0124] The automatic optimization submodule is connected to the substitution submodule and is used to automatically optimize the electronically controlled leakage graphic model based on the first pressure difference to calculate the aperture of the leakage hole.

[0125] Furthermore, the automatic optimization submodule is specifically used to perform optimization and solution with the first pressure difference as the target and the aperture of the leakage hole as the parameter to be optimized.

[0126] In some optional embodiments, the target process duration information in the duration determination module 604 includes the target charging process duration, the target pressure-maintaining process duration and the target detection process duration; the duration determination module 604 is specifically used to determine the product of the first process duration and the preset safety factor as the target charging process duration; wherein, the first process duration is the time taken for the airtight leak detection equipment graphic model to inflate the electronically controlled leakage graphic model so that the internal pressure of the electronically controlled leakage graphic model reaches the target charging pressure; the second process duration is determined as the target pressure-maintaining process duration; wherein, the starting time of the second process duration is the time when the internal pressure of the electronically controlled leakage graphic model reaches the target charging pressure, and the ending time of the second process duration is the time when the internal temperature of the electronically controlled leakage graphic model is the same as the external ambient temperature; the difference between the total target process duration and the third process duration is calculated so that the target detection process duration is not greater than the difference; wherein, the third process duration is the sum of the target charging process duration and the target pressure-maintaining process duration.

[0127] Furthermore, the simulation result also includes a pressure difference time curve for reflecting the relationship between the detection process duration and the second pressure difference; the second pressure difference is the internal pressure difference between the standard cavity graphic model detected by the airtight leak detection equipment graphic model and the electric control leakage graphic model; the airtight detection process duration determination device 600 also includes:

[0128] The calculation module is used to query the second pressure difference corresponding to the target detection process duration based on the pressure difference time curve after determining the target process duration information based on the simulation results; substitute the second pressure difference corresponding to the target detection process duration and the target detection process duration into the equivalent volume formula to calculate the target maximum allowable leakage.

[0129] In some optional embodiments, the second model construction module 602 is specifically used to obtain the electric-controlled cavity model to be tested, and obtain the volume and surface area of ​​the electric-controlled cavity to be tested based on the electric-controlled cavity model to be tested; based on the volume and surface area of ​​the electric-controlled cavity to be tested, construct an equivalent cavity graphic model.

[0130] It should be noted that the above-mentioned functional modules can be integrated together to form an independent unit, for example, integrated into a processing unit, or each module can exist physically separately, or two or more modules can be integrated to form an independent unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the function is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0131] Embodiment five:

[0132] Based on the same inventive concept, the embodiment of the present invention further provides an electronic device 700, the internal structure of the electronic device 700 is as follows: Figure 7 The electronic device 700 includes a memory 701 , a processor 702 and a communication bus 703 ; the memory 701 and the processor 702 are connected via the communication bus 703 .

[0133] The memory 701 can be used to store instructions, programs, codes, code sets or instruction sets. The memory 701 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function, and instructions for implementing the method for determining the duration of an airtight detection process provided in the above embodiment, etc.; the data storage area may store data involved in a method for determining the duration of an airtight detection process provided in the above embodiment, etc.

[0134] The processor 702 may include one or more processing cores. The processor 702 executes various functions and processes data of the present invention by running or executing instructions, programs, code sets or instruction sets stored in the memory 701, calling data stored in the memory 701. The processor 702 may be at least one of an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a central processing unit (CPU), a controller, a microcontroller and a microprocessor. It is understandable that for different devices, the electronic device used to implement the above-mentioned processor function may also be other, and the embodiment of the present invention is not specifically limited.

[0135] The communication bus 703 may include a path to transmit information between the above components. The communication bus 703 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus. The communication bus 703 may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7Only one double arrow is used in the diagram, but it does not mean that there is only one bus or one type of bus. Figure 7 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0136] Those skilled in the art will understand that Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the scheme of the present invention, and does not constitute a limitation on the electronic device to which the scheme of the present invention is applied. The specific electronic device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0137] Embodiment six:

[0138] In particular, according to an embodiment of the present invention, the process described in the above flowchart may be implemented as a computer software program.

[0139] The technical solution of the present invention, in essence, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, that is, the embodiment of the present invention also provides a computer-readable storage medium, which includes a number of computer programs or computer instructions, which are used to enable an electronic device (which can be a personal computer, server or network device, etc.) or a processor to perform all or part of the steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory, random access memory, disk or optical disk, etc., various media that can store program codes.

[0140] Embodiment seven:

[0141] An embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer readable medium, the computer program including a computer program for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network, and / or installed from a removable medium. When the computer program is executed by a central processing unit (CPU), various functions defined in the present invention are performed.

[0142] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A method for determining the duration of an airtightness detection process, characterized in that: include: Construct an equivalent cavity graphic model of the electronically controlled cavity to be tested; Constructing a graphical model for leak detection; Wherein, the leak detection graphic model includes a standard cavity graphic model, an airtight leak detection equipment graphic model and an electric control leakage graphic model; The graphic model of the airtight leak detection equipment is connected to the standard cavity graphic model and the electric control leakage graphic model respectively; The electrically controlled leakage graphic model is a graphic model in which leakage holes are added to the equivalent cavity graphic model; The aperture of the leakage hole is determined by the original maximum allowable leakage and the first pressure difference between the standard cavity graphic model and the electronically controlled leakage graphic model; In response to preset simulation parameters, the airtight detection process is simulated through the leak detection graphic model, so that the airtight leak detection equipment graphic model respectively performs inflation simulation on the standard cavity graphic model and the electric control leakage graphic model, and outputs simulation results; Wherein, the simulation result includes the corresponding relationship data of the internal pressure and internal temperature of the electric control leakage graphic model detected by the airtight leakage detection equipment graphic model and time; The target process duration information is determined based on the simulation results.

2. The method for determining the duration of the airtightness detection process according to claim 1, characterized in that: The aperture of the leakage hole is obtained by: Obtaining the original maximum allowable leakage and the original designed detection process duration; Substituting the original maximum allowable leakage and the original designed detection process duration into a preset equivalent volume formula to calculate the first pressure difference; Wherein, the equivalent volume formula is: Where Q is the leakage volume in ml / min; ΔP is the pressure difference in Pa; V e is the equivalent internal volume in milliliters; T is the duration of the detection process in seconds; The electronically controlled leakage graphic model is automatically optimized based on the first pressure difference to calculate the aperture of the leakage hole.

3. The method for determining the duration of the airtightness detection process according to claim 2, characterized in that: The automatically optimizing the electronically controlled leakage graphic model based on the first pressure difference to calculate the aperture of the leakage hole comprises: Taking the first pressure difference as the target and the aperture of the leakage hole as the parameter to be optimized, an optimization solution is sought.

4. The method for determining the duration of the airtightness detection process according to any one of claims 1 to 3, characterized in that: The target process duration information includes the target charging process duration, the target pressure holding process duration and the target detection process duration; Determining the target process duration information based on the simulation result includes: The product of the first process duration and the preset safety factor is determined as the target pressurization process duration; wherein the first process duration is the time taken by the airtight leak detection equipment graphic model to inflate the electric control leakage graphic model so that the internal pressure of the electric control leakage graphic model reaches the target pressurization pressure; Determine the second process duration as the target pressure-maintaining process duration; wherein the start time of the second process duration is the time when the internal pressure of the electronically controlled leakage pattern model reaches the target charging pressure, and the end time of the second process duration is the time when the internal temperature of the electronically controlled leakage pattern model is the same as the external ambient temperature; The difference between the total duration of the target process and the duration of the third process is calculated so that the duration of the target detection process is not greater than the difference; wherein the duration of the third process is the sum of the duration of the target charging process and the duration of the target pressure-maintaining process.

5. The method for determining the duration of the airtightness detection process according to claim 2 or 3, characterized in that: The simulation result also includes a pressure difference time curve for reflecting the relationship between the detection process duration and the second pressure difference; the second pressure difference is the internal pressure difference between the standard cavity graphic model and the electric control leakage graphic model detected by the airtight leak detection equipment graphic model; After determining the target process duration information based on the simulation result, the method further includes: Querying the second pressure difference corresponding to the target detection process duration based on the pressure difference time curve; The second pressure difference corresponding to the target detection process duration and the target detection process duration are substituted into the equivalent volume formula to calculate the target maximum allowable leakage.

6. The method for determining the duration of an airtightness detection process according to any one of claims 1 to 3, characterized in that: The construction of an equivalent cavity graphic model of the electronically controlled cavity to be tested comprises: Acquire a model of the electrically controlled cavity to be tested, and acquire the volume and surface area of ​​the electrically controlled cavity to be tested based on the model of the electrically controlled cavity to be tested; The equivalent cavity graphic model is constructed based on the volume and surface area of ​​the electrically controlled cavity to be tested.

7. A device for determining the duration of an airtightness detection process, characterized in that: include: A first model building module, a second model building module, a simulation module and a duration determination module; wherein, The first model building module is connected to the second model building module and is used to build an equivalent cavity graphic model of the electric control cavity to be tested; The second model building module is connected to the first model building module and the simulation module respectively, and is used to build a leak detection graphic model; wherein the leak detection graphic model includes a standard cavity graphic model, an airtight leak detection device graphic model and an electric-controlled leakage graphic model; the airtight leak detection device graphic model is connected to the standard cavity graphic model and the electric-controlled leakage graphic model respectively; the electric-controlled leakage graphic model is a graphic model in which a leakage hole is added to the equivalent cavity graphic model; the aperture of the leakage hole is determined by the original maximum allowable leakage and the first pressure difference between the standard cavity graphic model and the electric-controlled leakage graphic model; The simulation module is connected to the second model building module and the duration determination module respectively, and is used to simulate the airtight detection process through the leak detection graphic model in response to preset simulation parameters, so that the airtight leak detection equipment graphic model can respectively perform inflation simulation on the standard cavity graphic model and the electric control leakage graphic model, and output simulation results; wherein the simulation results include the corresponding relationship data of the internal pressure and the internal temperature of the electric control leakage graphic model detected by the airtight leak detection equipment graphic model and time; The duration determination module is connected to the simulation module and is used to determine the target process duration information based on the simulation result.

8. An electronic device, characterized in that: including a processor and a memory; The memory stores a computer program or computer instruction that can be loaded by the processor and executes the method for determining the duration of the airtight detection process according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program or computer instructions that can be loaded by a processor and execute the method for determining the duration of an airtightness detection process according to any one of claims 1 to 6.

10. A computer program product comprising a computer program or computer instructions, characterized in that When the computer program or the computer instruction is loaded and executed by a processor, the steps of the method for determining the duration of an airtightness detection process as claimed in any one of claims 1 to 6 are implemented.

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