EGR (Exhaust Gas Recirculation) valve leakage test fixture structure, leakage test detection method and application

Abstract

The invention belongs to the technical field of leakage testing of EGR valves, and discloses an EGR valve leakage testing jig structure, a leakage testing detection method and application. According to the method, the current pressure value and the current gas flow value of a gas supply storage tank are detected through a gas supply storage tank pressure detection induction sheet, and the current gas leakage pressure value and the current gas leakage gas flow value of an EGR valve are detected through an EGR valve gas leakage detection induction sheet; the detected information is sent to a gas flow contrastive analysis module for proportional analysis; and when the ratio of the current EGR valve gas leakage pressure value and the current EGR valve gas leakage gas flow value to the current gas supply storage tank pressure value and the current gas supply storage tank gas flow value is smaller than a set gas leakage threshold value, the EGR valve is normal. According to the invention, through the provided leakage test confirmation of the market return EGR valve investigation workpiece and the provided leakage test fixture structure, rapid leakage test confirmation of the market return EGR valve investigation workpiece is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of leak detection of EGR valves, and particularly relates to a leak detection fixture structure for an EGR valve, a leak detection method, and an application thereof. Background Art

[0002] Market bad information feedback (EGR valve fault code, vehicle unable to start), investigation after the EGR valve is returned, which includes leak detection confirmation. In the past, it was necessary to return the EGR valve to the parts manufacturer for investigation.

[0003] Through the above analysis, the problems and defects existing in the prior art are as follows:

[0004] For the EGR valve returned by the market, leak detection confirmation needs to be carried out by returning it to the parts manufacturer. There are problems such as time consumption and the result cannot be confirmed on-site. Summary of the Invention

[0005] To overcome the problems existing in the related art, the disclosed embodiments of the present invention provide a leak detection fixture structure for an EGR valve, a leak detection method, and an application thereof, specifically relating to the design and application of a leak detection fixture structure for an EGR valve.

[0006] The technical solution is as follows: A leak detection method for a leak detection fixture structure of an EGR valve, the method comprising:

[0007] S1, detecting the current gas supply tank pressure value and the current gas supply tank gas flow value through a gas supply tank pressure detection sensing sheet, and detecting the current EGR valve leak pressure value and the current EGR valve leak gas flow value through an EGR valve leak detection sensing sheet;

[0008] S2, sending the information detected in step S1 above to a gas flow comparison and analysis module, and the gas flow comparison and analysis module performs proportional analysis on the obtained current gas supply tank pressure value and the current gas supply tank gas flow value, and the current EGR valve leak pressure value and the current EGR valve leak gas flow value;

[0009] S3, when the ratio of the current EGR valve leak pressure value and the current EGR valve leak gas flow value to the current gas supply tank pressure value and the current gas supply tank gas flow value is greater than or equal to a set leak threshold, it is determined that there is a leak; when the ratio of the current EGR valve leak pressure value and the current EGR valve leak gas flow value to the current gas supply tank pressure value and the current gas supply tank gas flow value is less than the set leak threshold, the EGR valve is normal.

[0010] Further, in step S2, performing proportional analysis on the obtained current gas supply tank pressure value and the current gas supply tank gas flow value, and the current EGR valve leak pressure value and the current EGR valve leak gas flow value includes:

[0011] S201, Initialize parameters: the pressure value and gas flow value of the gas supply storage tank, or the leakage pressure value and leakage gas flow value of the EGR valve, the number N of them, the total number of classifications I = N / 2, the total number M of calculated proportion subsets c , and the number x of proportion subsets defined for each pressure value and gas flow value of the gas supply storage tank, or leakage pressure value and leakage gas flow value of the EGR valve u = 0, u ∈ U;

[0012] S202, Sort all the pressure values and gas flow values of the gas supply storage tank, or the leakage pressure values and leakage gas flow values of the EGR valve in descending order according to the information induction channel gain h1 ≥ h2 ≥... ≥ h U ;

[0013] S203, Respectively take the 1st, 2nd,..., N / 2th pressure values and gas flow values of the gas supply storage tank, or the leakage pressure values and leakage gas flow values of the EGR valve as the 1st, 2nd,..., Ith first pressure values and gas flow values of the gas supply storage tank, or the leakage pressure values and leakage gas flow values of the EGR valve for each class;

[0014] S204, Respectively take the (N / 2 + 1)th, (N / 2 + 2)th,..., Nth pressure values and gas flow values of the gas supply storage tank, or the leakage pressure values and leakage gas flow values of the EGR valve as the 1st, 2nd,..., Ith second pressure values and gas flow values of the gas supply storage tank, or the leakage pressure values and leakage gas flow values of the EGR valve for each class, and complete the classification of the pressure values and gas flow values of the gas supply storage tank, or the leakage pressure values and leakage gas flow values of the EGR valve;

[0015] S205, Start the first round of calculation of proportion subset definition to ensure the task execution delay requirements for each pressure value and gas flow value of the gas supply storage tank, or the leakage pressure value and leakage gas flow value of the EGR valve;

[0016] S206, Start the second round of calculation of proportion subset definition;

[0017] S207, Execution ends, and the classification of the pressure values and gas flow values of the gas supply storage tank, or the leakage pressure values and leakage gas flow values of the EGR valve and the calculation proportion subset definition strategy are obtained.

[0018] In step S201, there are 2 pressure values and gas flow values of the gas supply storage tank, or the leakage pressure values and leakage gas flow values of the EGR valve in each class, and a compromise is made between spectral efficiency and implementation complexity;

[0019] In step S205, the calculation ratio involved is defined in units of calculation ratio subsets. Each gas supply storage tank pressure value and gas flow value or EGR valve leakage pressure value and leakage gas flow value are defined into several calculation ratio subsets; the number of calculation ratio subsets is sufficient; when performing the first round of calculation ratio subset definition, enough calculation ratio subsets are defined for each gas supply storage tank pressure value and gas flow value or EGR valve leakage pressure value and leakage gas flow value to meet the task processing delay constraint of the gas supply storage tank pressure value and gas flow value or EGR valve leakage pressure value and leakage gas flow value.

[0020] In step S205, ensuring the task execution delay requirements for each gas supply storage tank pressure value and gas flow value or EGR valve leakage pressure value and leakage gas flow value includes:

[0021] (1) Starting from the first gas supply storage tank pressure value and gas flow value or EGR valve leakage pressure value and leakage gas flow value, for each gas supply storage tank pressure value and gas flow value or EGR valve leakage pressure value and leakage gas flow value u ∈ U, define a calculation ratio subset for it, and at the same time remove this ratio subset from the total ratio subsets, that is, execute x u = x u + 1, M c = M c - 1;

[0022] (2) Judge whether it satisfies If it does not satisfy, continue to define the ratio subset for the current gas supply storage tank pressure value and gas flow value or EGR valve leakage pressure value and leakage gas flow value u, and execute step (1); if it satisfies, judge whether the current gas supply storage tank pressure value and gas flow value or EGR valve leakage pressure value and leakage gas flow value is the last gas supply storage tank pressure value and gas flow value or EGR valve leakage pressure value and leakage gas flow value. If so, execute step S206; if not, start to define the calculation ratio subset for the next gas supply storage tank pressure value and gas flow value or EGR valve leakage pressure value and leakage gas flow value, execute u = u + 1, and then execute step (1).

[0023] In step S206, start the second round of calculation ratio subset definition:

[0024] (a) First, judge whether it satisfies M c > 4. If it does not satisfy, execute step S207; if it satisfies, calculate the reduction amount of the pressure value or gas flow variable after defining one more calculation ratio subset for each gas supply storage tank pressure value and gas flow value or EGR valve leakage pressure value and leakage gas flow value u ∈ U compared with the current pressure value or gas flow variable, that is, the pressure value or gas flow variable gain

[0025] (b) Find the supply gas storage tank pressure value and gas flow value, or the EGR valve leakage pressure value and leakage gas flow value, among which the reduction amount of the pressure value or gas flow variable is the largest, and denote it as u * , that is For the supply gas storage tank pressure value and gas flow value, or the EGR valve leakage pressure value and leakage gas flow value u * Define a calculation proportion subset, and at the same time remove this proportion subset from the total proportion subset, that is, execute M c = M c - 1.

[0026] In step S207, the strategy for obtaining the classification of the supply gas storage tank pressure value and gas flow value, or the EGR valve leakage pressure value and leakage gas flow value, and defining the calculation proportion subset includes the following steps:

[0027] Step 1, set the number U of the supply gas storage tank pressure value and gas flow value, or the EGR valve leakage pressure value and leakage gas flow value, in the gas flow comparison analysis module, the number I of classes, and the relevant parameters of the classification tree method, including the number L of classification tree poles, the maximum amplitude and the maximum number of classification tree branches The number γ parameter of the mutation tail branches;

[0028] Step 2, initialize an initial population with L classification tree poles, where each classification tree pole is an I*2-dimensional gas output quantity definition matrix Π p , in the form of Each column of it is the gas output quantity of two supply gas storage tank pressure values and gas flow values, or EGR valve leakage pressure values and leakage gas flow values within a class;

[0029] Step 3, judge the loop. For each classification tree pole l, calculate its proportion fitness value;

[0030] Step 4, obtain the number of classification tree branches of each classification tree pole

[0031] Step 5, perform a branching operation on each classification tree pole to generate classification tree branches, and each classification tree branch is also an I*2-dimensional gas output quantity definition matrix;

[0032] Step 6, calculate the proportion fitness value of each classification tree branch;

[0033] Step 7: Randomly select γ classification tree trunks from the classification tree trunk population, perform mutation operations on each classification tree trunk, and generate 1 mutant branch for each classification tree trunk. Similarly, each mutant branch is an I*2-dimensional gas output quantity definition matrix;

[0034] Step 8: Calculate the proportional fitness value of each mutant branch;

[0035] Step 9: In the population containing all classification tree trunks and branches, retain the best individual as a classification tree trunk for the next generation, and then randomly select the other L-1 classification tree trunks from the remaining individuals based on the probability formula;

[0036] Step 10: Use the classification tree trunk population obtained in Step 9 as the classification tree trunk for the next generation, and perform the next iteration, that is, start from Step 3 again until convergence, and finally obtain the optimal strategy.

[0037] In Step 2, in Step 5, and in Step 7, each classification tree trunk, classification tree branch, and mutant branch is an I*2-dimensional gas output quantity definition matrix Π p , in the form of The two elements in each column are the gas output quantities of the pressure values and gas flow values of two gas supply storage tanks within a class or the pressure value and leakage gas flow value of the EGR valve leakage;

[0038] All classification tree trunks, classification tree branches, and mutant branches are collectively referred to as the population, and each classification tree trunk, classification tree branch, or mutant branch is called an individual;

[0039] In Step 3, in Step 6, and in Step 8, the proportional fitness value of each individual is the sum of the pressure values and gas flow values of the gas supply storage tanks or the pressure value and leakage gas flow value of the EGR valve leakage obtained from all the gas output quantities of the pressure values and gas flow values of the gas supply storage tanks or the pressure value and leakage gas flow value of the EGR valve leakage in the individual, that is

[0040] The branching operation in Step 5 includes the following steps:

[0041] 1) Generate a random number:

[0042] 2) Randomly select O columns from the classification tree trunk Π l ;

[0043] 3) Calculate the variable h = rand(0, A l );

[0044] 4) Execute If If

[0045] The mutation operation in step 7 includes the following steps:

[0046] Generate a random number:

[0047] Randomly select O columns from the classification tree trunk Π l in;

[0048] Calculate the coefficient of variation f = Gaussian(1, 1);

[0049] Execute

[0050] Another object of the present invention is to provide a leak detection fixture structure for an EGR valve. The structure includes a high-pressure gas supply storage tank, and the high-pressure gas supply storage tank is connected with a three-way connector through a gas pipe; one air outlet of the three-way connector is connected with the pressure detection port of the gas supply storage tank of the flow-type leak detector through a gas pipe, and the current pressure value and the current gas flow value of the gas supply storage tank are detected through a gas supply storage tank pressure detection induction sheet installed on the pressure detection port of the gas supply storage tank, and the detected current pressure value and the current gas flow value of the gas supply storage tank are transmitted to a gas flow comparison and analysis module installed inside the flow-type leak detector;

[0051] The other air outlet of the three-way connector is connected with the air inlet end of the EGR valve through a gas pipe; the air inlet end is connected with the air outlet end of the EGR valve through the opening valve core of the EGR valve (4); the air outlet end is connected with the EGR valve leak detection port of the flow-type leak detector through a gas pipe, and the current EGR valve leak pressure value and the current EGR valve leak gas flow value are detected through an EGR valve leak detection induction sheet installed on the EGR valve leak detection port, and the detected current EGR valve leak pressure value and the current EGR valve leak gas flow value are transmitted to a gas flow comparison and analysis module installed inside the flow-type leak detector;

[0052] The pressure detection port of the gas supply storage tank and the EGR valve leak detection port are both output through a gas collection channel installed inside the flow-type leak detector.

[0053] Another object of the present invention is to provide an application of the leak detection method of the above-mentioned EGR valve leak detection fixture structure in the detection of vehicle engine components. The application uses the above-mentioned EGR valve leak detection fixture structure to perform EGR valve leak detection.

[0054] Combining all the above technical solutions, the beneficial effects of the present invention are as follows:

[0055] The present invention realizes the rapid leak detection confirmation of the market-returned EGR valve inspection workpiece through the proposed leak detection confirmation of the market-returned EGR valve inspection workpiece and the proposed leak detection fixture structure. Description of the Drawings

[0056] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure;

[0057] Figure 1 It is a schematic structural diagram of an EGR valve leak detection fixture provided by an embodiment of the present invention;

[0058] Figure 2 It is a flowchart of a method for detecting air leakage in the structure of an EGR valve leak detection fixture provided by an embodiment of the present invention;

[0059] Figure 3 It is a flowchart for proportional analysis of the current gas supply tank pressure value and the current gas supply tank gas flow value of the present invention, and the current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value;

[0060] In the figure: 1. Connect the flow-type leak detector; 101. Gas storage tank pressure detection port; 102. Gas supply tank pressure detection induction piece; 103. Gas flow comparison and analysis module; 104. EGR valve air leakage detection port; 105. EGR valve air leakage detection induction piece; 106. Gas collection channel; 2. Air pipe; 3. Three-way connector; 4. EGR valve; 401. Intake end; 402. Opening valve core; 403. Outlet end; 5. High-pressure gas supply tank. Detailed implementation manners

[0061] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manners of the present invention will be given with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.

[0062] Example 1, as Figure 1 shown, the EGR valve leak detection fixture structure provided by the embodiment of the present invention includes a high-pressure gas supply tank 5, and the high-pressure gas supply tank 5 is connected to a three-way connector 3 through an air pipe 2; one outlet hole of the three-way connector 3 is connected to the gas supply tank pressure detection port 101 of the flow-type leak detector 1 through an air pipe 2, and the current gas supply tank pressure value and the current gas supply tank gas flow value are detected on the gas supply tank pressure detection port 101 through the installed gas supply tank pressure detection induction piece 102, and the detected current gas supply tank pressure value and the current gas supply tank gas flow value are transmitted to the gas flow comparison and analysis module 103 installed inside the flow-type leak detector 1;

[0063] The other end air outlet of the three-way connector 3 is connected to the intake end 401 of the EGR valve 4 through the air pipe 2; the intake end 401 is connected to the outlet end 403 of the EGR valve 4 through the opening spool 402 of the EGR valve 4; the outlet end 403 is connected to the EGR valve air leakage detection port 104 of the flow type leak detector 1 through the air pipe 2. The current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value are detected through the EGR valve air leakage detection induction piece 105 installed on the EGR valve air leakage detection port 104, and the detected current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value are transmitted to the gas flow comparison and analysis module 103 installed inside the flow type leak detector 1;

[0064] The gas flow comparison and analysis module 103 performs proportional analysis on the obtained current gas supply tank pressure value and the current gas supply tank gas flow value, and the current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value. When the ratio of the current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value to the current gas supply tank pressure value and the current gas supply tank gas flow value is greater than or equal to the set air leakage threshold, it is determined that there is air leakage; when the ratio of the current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value to the current gas supply tank pressure value and the current gas supply tank gas flow value is less than the set air leakage threshold, the EGR valve is normal;

[0065] The gas supply tank pressure detection port 101 and the EGR valve air leakage detection port 104 are both output through the gas collection channel 106 installed inside the flow type leak detector 1.

[0066] Embodiment 2, as Figure 2 shown, the EGR valve leak detection fixture structure leak detection method provided by the embodiment of the present invention designs a leak detection tooling fixture according to the shape and size of the EGR valve, and combines with a flow type leak detector to conduct a leak detection confirmation investigation on the EGR valves returned from the market.

[0067] Specifically, it includes:

[0068] S1, detecting the current gas supply tank pressure value and the current gas supply tank gas flow value through the gas supply tank pressure detection induction piece 102, and detecting the current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value through the EGR valve air leakage detection induction piece 105;

[0069] S2, sending the information detected in the above step S1 to the gas flow comparison and analysis module 103, and the gas flow comparison and analysis module 103 performs proportional analysis on the obtained current gas supply tank pressure value and the current gas supply tank gas flow value, and the current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value;

[0070] S3. When the ratio of the current EGR valve leakage pressure value and the current EGR valve leakage gas flow value to the current gas supply storage tank pressure value and the current gas supply storage tank gas flow value is greater than or equal to the set leakage threshold, it is determined that there is a leakage; when the ratio of the current EGR valve leakage pressure value and the current EGR valve leakage gas flow value to the current gas supply storage tank pressure value and the current gas supply storage tank gas flow value is less than the set leakage threshold, the EGR valve is normal.

[0071] As Figure 3 shown, in step S2, the proportional analysis of the obtained current gas supply storage tank pressure value and the current gas supply storage tank gas flow value and the current EGR valve leakage pressure value and the current EGR valve leakage gas flow value includes:

[0072] S201. Initialize parameters: the number N of the gas supply storage tank pressure values and gas flow values or the EGR valve leakage pressure values and leakage gas flow values, the total number of classifications I = N / 2, the total number M of the calculated proportional subset numbers c , and the number x of the proportional subsets defined for each gas supply storage tank pressure value and gas flow value or EGR valve leakage pressure value and leakage gas flow value u = 0, u ∈ U;

[0073] S202. Sort all the gas supply storage tank pressure values and gas flow values or the EGR valve leakage pressure values and leakage gas flow values in descending order according to the information induction channel gain h1 ≥ h2 ≥... ≥ h U ;

[0074] S203. Respectively take the 1st, 2nd,..., N / 2th gas supply storage tank pressure values and gas flow values or the EGR valve leakage pressure values and leakage gas flow values as the first gas supply storage tank pressure values and gas flow values or the EGR valve leakage pressure values and leakage gas flow values of the 1st, 2nd,..., Ith classes;

[0075] S204. Respectively take the (N / 2 + 1)th, (N / 2 + 2)th,..., Nth gas supply storage tank pressure values and gas flow values or the EGR valve leakage pressure values and leakage gas flow values as the second gas supply storage tank pressure values and gas flow values or the EGR valve leakage pressure values and leakage gas flow values of the 1st, 2nd,..., Ith classes, and complete the classification of the gas supply storage tank pressure values and gas flow values or the EGR valve leakage pressure values and leakage gas flow values;

[0076] S205. Start the first round of calculation of proportional subset definition to ensure the task execution delay requirements of each gas supply storage tank pressure value and gas flow value or the EGR valve leakage pressure value and leakage gas flow value;

[0077] S206. Start the second round of calculation of proportional subset definition;

[0078] S207, the execution ends, and a classification and calculation ratio subset definition strategy for the gas supply storage tank pressure value and gas flow value or the EGR valve air leakage pressure value and air leakage gas flow value is obtained.

[0079] Exemplarily, in step S201, there are 2 gas supply storage tank pressure values and gas flow values or EGR valve air leakage pressure values and air leakage gas flow values in each class, and a compromise is made between spectral efficiency and implementation complexity;

[0080] Exemplarily, in step S205, the calculation ratio involved is defined in units of calculation ratio subsets, and each gas supply storage tank pressure value and gas flow value or EGR valve air leakage pressure value and air leakage gas flow value is defined into several calculation ratio subsets; the number of calculation ratio subsets is sufficient; when performing the first round of calculation ratio subset definition, enough calculation ratio subsets are defined for each gas supply storage tank pressure value and gas flow value or EGR valve air leakage pressure value and air leakage gas flow value to meet the task processing delay constraint of the gas supply storage tank pressure value and gas flow value or EGR valve air leakage pressure value and air leakage gas flow value.

[0081] Exemplarily, in step S205, ensuring the task execution delay requirements for each gas supply storage tank pressure value and gas flow value or EGR valve air leakage pressure value and air leakage gas flow value includes:

[0082] (1) Starting from the first gas supply storage tank pressure value and gas flow value or EGR valve air leakage pressure value and air leakage gas flow value, for each gas supply storage tank pressure value and gas flow value or EGR valve air leakage pressure value and air leakage gas flow value u ∈ U, define a calculation ratio subset for it, and at the same time remove this ratio subset from the total ratio subsets, that is, execute x u = x u + 1, M c = M c - 1;

[0083] (2) Judge whether it satisfies If it does not satisfy, continue to define a ratio subset for the current gas supply storage tank pressure value and gas flow value or EGR valve air leakage pressure value and air leakage gas flow value, and execute step (1); if it satisfies, judge whether the current gas supply storage tank pressure value and gas flow value or EGR valve air leakage pressure value and air leakage gas flow value is the last gas supply storage tank pressure value and gas flow value or EGR valve air leakage pressure value and air leakage gas flow value. If so, execute step S206; if not, start to define the calculation ratio subset for the next gas supply storage tank pressure value and gas flow value or EGR valve air leakage pressure value and air leakage gas flow value, execute u = u + 1, and then execute step (1).

[0084] Exemplarily, in step S206, start the second round of calculation ratio subset definition:

[0085] (a) First, determine whether M c > 4. If not, execute step S207; if so, calculate the reduction amount of the pressure value or gas flow rate variable of each gas supply storage tank pressure value and gas flow rate value or EGR valve leakage pressure value and leakage gas flow rate value u∈U after defining a calculation ratio subset, that is, the pressure value or gas flow rate variable gain

[0086] (b) Find the gas supply storage tank pressure value and gas flow rate value or EGR valve leakage pressure value and leakage gas flow rate value with the largest reduction amount of the pressure value or gas flow rate variable among all gas supply storage tank pressure values and gas flow rate values or EGR valve leakage pressure values and leakage gas flow rate values, denoted as u * , that is Define a calculation ratio subset for the gas supply storage tank pressure value and gas flow rate value or EGR valve leakage pressure value and leakage gas flow rate value u * and at the same time remove this ratio subset from the total ratio subset, that is, execute M c = M c - 1.

[0087] Exemplarily, in step S207, the strategy for obtaining the classification and calculation ratio subset definition of the gas supply storage tank pressure value and gas flow rate value or EGR valve leakage pressure value and leakage gas flow rate value includes the following steps:

[0088] Step 1, set the number U of gas supply storage tank pressure values and gas flow rate values or EGR valve leakage pressure values and leakage gas flow rate values in the gas flow comparison analysis module, the number I of classes, and the relevant parameters of the classification tree method, including the number L of classification tree poles, the maximum amplitude and the maximum number of classification tree branches the number γ parameter of the mutation tail branches;

[0089] Step 2, initialize an initial population with L classification tree poles, where each classification tree pole is a gas output quantity definition matrix Π of I*2 dimensions p , in the form of Each column of it is the gas output quantity of two gas supply storage tank pressure values and gas flow rate values or EGR valve leakage pressure values and leakage gas flow rate values within a class;

[0090] Step 3, judge the loop for each classification tree pole l and calculate its ratio suitability value;

[0091] Step 4, obtain the number of classification tree branches of each classification tree pole

[0092] Step 5. Perform a branching operation on each classification tree trunk to generate classification tree branches, and each classification tree branch is also an I*2-dimensional gas output quantity definition matrix;

[0093] Step 6. Calculate the proportional fitness value of each classification tree branch;

[0094] Step 7. Randomly select γ classification tree trunks from the classification tree trunk population, perform a mutation operation on each classification tree trunk, and each classification tree trunk generates 1 mutation tail branch. Similarly, each mutation tail branch is an I*2-dimensional gas output quantity definition matrix;

[0095] Step 8. Calculate the proportional fitness value of each mutation tail branch;

[0096] Step 9. In the population containing all classification tree trunks and tail branches, retain the best individual as a classification tree trunk for the next generation, and then randomly select the other L-1 classification tree trunks from the remaining individuals based on the probability formula;

[0097] Step 10: Use the classification tree trunk population obtained in Step 9 as the classification tree trunks for the next generation, and perform the next iteration, that is, start from Step 3 again until convergence, and finally obtain the optimal strategy.

[0098] In Step 2, in Step 5, and for each classification tree trunk, classification tree branch, and mutation tail branch in Step 7, they are all an I*2-dimensional gas output quantity definition matrix Π p , in the form of The two elements in each column are the gas output quantities of the pressure values and gas flow values of two gas supply storage tanks within a class or the pressure value and leakage gas flow value of the EGR valve leakage;

[0099] All classification tree trunks, classification tree branches, and mutation tail branches are collectively referred to as the population, and each classification tree trunk, classification tree branch, or mutation tail branch is called an individual;

[0100] In Step 3, in Step 6, and for each individual in Step 8, the proportional fitness value is the sum of the pressure values and gas flow values of the gas supply storage tanks or the pressure value and leakage gas flow value of the EGR valve leakage obtained from all the pressure values and gas flow values of the gas supply storage tanks or the pressure value and leakage gas flow value of the EGR valve leakage in the individual, that is

[0101] The branching operation in Step 5 includes the following steps:

[0102] 1) Generate a random number:

[0103] 2) Randomly select O columns from the classification tree trunk Π l ;

[0104] 3) Calculate the variable h = rand(0, A l )

[0105] 4) Execute If If

[0106] The mutation operation in step 7 includes the following steps:

[0107] Generate a random number:

[0108] Randomly select O columns from the classification tree trunk Π l ;

[0109] Calculate the mutation coefficient f = Gaussian(1, 1);

[0110] Execute

[0111] The present invention is based on a collaborative optimization method for classifying, calculating, and defining proportional subsets, and controlling gas output for the pressure value and gas flow value of a gas supply storage tank or the leakage pressure value and leakage gas flow value of an EGR valve. Under the condition of ensuring the required task processing delay for the pressure value and gas flow value of the gas supply storage tank or the leakage pressure value and leakage gas flow value of the EGR valve, as many pressure values and gas flow values of the gas supply storage tank or the leakage pressure value and leakage gas flow value of the EGR valve as possible are analyzed, and the variables of the pressure value and gas flow value of the gas supply storage tank or the leakage pressure value and leakage gas flow value of the EGR valve are reduced.

[0112] In addition, the present invention takes into account possible scenarios in practice, which is beneficial to reducing its pressure value or gas flow variables. Furthermore, for the joint optimization of classifying, calculating resource definition, and gas output control for the combined pressure value and gas flow value of the gas supply storage tank or the leakage pressure value and leakage gas flow value of the EGR valve proposed in the present invention, a heuristic algorithm with low complexity is designed, which is simple to operate and easy to implement. The present invention can effectively reduce the cost consumption of the system detection process by jointly optimizing the classification, calculation resource definition, and gas output control of the pressure value and gas flow value of the gas supply storage tank or the leakage pressure value and leakage gas flow value of the EGR valve on the premise of ensuring the task execution delay of the pressure value and gas flow value of the gas supply storage tank or the leakage pressure value and leakage gas flow value of the EGR valve.

[0113] In the above embodiments, the descriptions of each embodiment have their own focuses. For parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0114] For the information interaction, execution process, etc. between the above-mentioned devices / units, since they are based on the same concept as the method embodiments of the present invention, for their specific functions and the technical effects brought about, reference can be specifically made to the method embodiment part, and details will not be elaborated here.

[0115] Those skilled in the art can clearly understand that for the sake of convenience and brevity of description, only the above-mentioned division of each functional unit and module is used as an example for illustration. In actual applications, the above-mentioned functions can be defined by different functional units and modules as needed, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of the present invention. The specific working process of the units and modules in the above system can refer to the corresponding process in the foregoing method embodiment.

[0116] The embodiment of the present invention also provides a computer device, which includes: at least one processor, a memory, and a computer program stored in the memory and executable on the at least one processor. When the processor executes the computer program, the steps in any of the above-mentioned method embodiments are implemented.

[0117] The embodiment of the present invention also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps in each of the above-mentioned method embodiments can be implemented.

[0118] The embodiment of the present invention also provides an information data processing terminal, which is used to provide an input interface for the pressure value of the gas supply storage tank and the gas flow value or the leakage pressure value of the EGR valve and the leakage gas flow value when executed on an electronic device to implement the steps in each of the above-mentioned method embodiments. The information data processing terminal is not limited to mobile phones, computers, and switches.

[0119] The embodiment of the present invention also provides a server, which is used to provide an input interface for the pressure value of the gas supply storage tank and the gas flow value or the leakage pressure value of the EGR valve and the leakage gas flow value when executed on an electronic device to implement the steps in each of the above-mentioned method embodiments.

[0120] The embodiment of the present invention provides a computer program product. When the computer program product runs on an electronic device, the electronic device can execute the steps in each of the above-mentioned method embodiments when executed.

[0121] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, to implement all or part of the processes in the above-described embodiment methods of this application, a computer program can be used to instruct relevant hardware to complete. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-described various method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can at least include: any entity or device, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium that can carry the computer program code to the photographing device / terminal device. For example, a USB flash drive, a mobile hard disk, a magnetic disk, or an optical disc, etc.

[0122] As described above, only the relatively preferred specific implementation manners of the present invention are provided, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A leak detection method for the leak detection fixture structure of an EGR valve, characterized in that, The method includes: S1. Detect the current gas supply tank pressure value and the current gas supply tank gas flow value through the gas supply tank pressure detection sensing piece, and detect the current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value through the EGR valve air leakage detection sensing piece; S2. Send the information detected in step S1 above to the gas flow comparison and analysis module, and the gas flow comparison and analysis module performs proportional analysis on the obtained current gas supply tank pressure value and the current gas supply tank gas flow value, and the current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value; S3. When the ratio of the current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value to the current gas supply tank pressure value and the current gas supply tank gas flow value is greater than or equal to the set air leakage threshold, it is determined as air leakage; when the ratio of the current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value to the current gas supply tank pressure value and the current gas supply tank gas flow value is less than the set air leakage threshold, the EGR valve is normal.

2. The leak detection method for the EGR valve leak detection fixture structure according to claim 1, characterized in that, In step S2, the proportional analysis of the obtained current gas supply tank pressure value and the current gas supply tank gas flow value, and the current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value includes: S201, Initialize parameters: the pressure value and gas flow value of the gas supply storage tank, or the leakage pressure value and leakage gas flow value of the EGR valve, the number N of them, the total number of classifications I = N / 2, the total number M of calculated proportional subset c , and the number x of proportional subsets defined for each pressure value and gas flow value of the gas supply storage tank, or the leakage pressure value and leakage gas flow value of the EGR valve u = 0, u ∈ U; S202, sort all the pressure values and gas flow values of the gas supply storage tanks or the pressure values and leakage gas flow values of the EGR valve in descending order according to the information induction channel gain, h1≥h2≥...≥h U ; S203. Respectively take the first N / 2 gas supply tank pressure values and gas flow values or EGR valve air leakage pressure values and air leakage gas flow values as the first gas supply tank pressure values and gas flow values or EGR valve air leakage pressure values and air leakage gas flow values of the first 1, 2, …, I classes; S204. Respectively take the N / 2 + 1, N / 2 + 2, …, N gas supply tank pressure values and gas flow values or EGR valve air leakage pressure values and air leakage gas flow values as the second gas supply tank pressure values and gas flow values or EGR valve air leakage pressure values and air leakage gas flow values of the first 1, 2, …, I classes, and complete the classification of the gas supply tank pressure values and gas flow values or EGR valve air leakage pressure values and air leakage gas flow values; S205. Start the first round of calculation of the proportional subset definition to ensure the task execution delay requirements of each gas supply tank pressure value and gas flow value or EGR valve air leakage pressure value and air leakage gas flow value; S206. Start the second round of calculation of the proportional subset definition; S207. The execution ends, and the classification of the gas supply tank pressure values and gas flow values or EGR valve air leakage pressure values and air leakage gas flow values and the calculation proportional subset definition strategy are obtained.

3. The leak detection method for the leak detection fixture structure of the EGR valve according to claim 2, characterized in that, In step S201, there are 2 gas supply tank pressure values and gas flow values or EGR valve air leakage pressure values and air leakage gas flow values in each class, and a compromise is made between the spectral efficiency and the implementation complexity. In step S205, the calculation ratio involved is defined in units of calculation ratio subsets. Each gas supply storage tank pressure value and gas flow value, or EGR valve air leakage pressure value and air leakage gas flow value are defined into several calculation ratio subsets; the number of calculation ratio subsets is sufficient; when performing the first round of calculation ratio subset definition, enough calculation ratio subsets are defined for each gas supply storage tank pressure value and gas flow value, or EGR valve air leakage pressure value and air leakage gas flow value to meet the task processing delay constraint of the gas supply storage tank pressure value and gas flow value, or EGR valve air leakage pressure value and air leakage gas flow value.

4. The leak detection method for the leak detection fixture structure of the EGR valve according to claim 2, characterized in that, In step S205, ensuring that the task execution delay requirements for each gas supply storage tank pressure value and gas flow value, or EGR valve air leakage pressure value and air leakage gas flow value include: (1) Starting from the first gas supply storage tank pressure value and gas flow value, or the EGR valve air leakage pressure value and air leakage gas flow value, for each gas supply storage tank pressure value and gas flow value, or EGR valve air leakage pressure value and air leakage gas flow value u ∈ U, define a calculation ratio subset for it, and at the same time remove this ratio subset from the total ratio subset, that is, execute x u = x u + 1, M c = M c - 1; (2) Determine whether the condition is met If not, continue to define the proportional subset for the current gas supply storage tank pressure value and gas flow value or the EGR valve leakage pressure value and leakage gas flow value u, and execute step (1); if met, determine whether the current gas supply storage tank pressure value and gas flow value or the EGR valve leakage pressure value and leakage gas flow value are the last gas supply storage tank pressure value and gas flow value or the EGR valve leakage pressure value and leakage gas flow value. If so, execute step S206; if not, start to calculate the proportional subset definition for the next gas supply storage tank pressure value and gas flow value or the EGR valve leakage pressure value and leakage gas flow value, execute u = u + 1, and then execute step (1).

5. The leak detection method of the EGR valve leak detection fixture structure according to claim 2, characterized in that In step S206, start the second round of calculation ratio subset definition: (a) First, determine whether M is satisfied c > 4. If not, execute step S207; if satisfied, calculate the reduction of the pressure value or gas flow rate value for each gas supply storage tank or the pressure value of the EGR valve air leakage and the air leakage gas flow rate value u∈U after defining a calculation ratio subset for the pressure value or gas flow rate variable compared to the current pressure value or gas flow rate variable, that is, the pressure value or gas flow rate variable gain (b) Find out the supply gas storage tank pressure value and gas flow value, or the EGR valve leakage pressure value and leakage gas flow value, among which the pressure value or the reduction amount of the gas flow variable is the largest, and denote them as u * , that is Define a calculation proportion subset for the supply gas storage tank pressure value and gas flow value, or the EGR valve leakage pressure value and leakage gas flow value u * , and at the same time remove this proportion subset from the total proportion subset, that is, execute M c = M c - 1.

6. The leak detection method for the EGR valve leak detection fixture structure according to claim 2, characterized in that, In step S207, the steps for obtaining the classification and calculation ratio subset definition strategy of the gas supply storage tank pressure value and gas flow value, or EGR valve air leakage pressure value and air leakage gas flow value include the following steps: Step 1, set the pressure value of the gas supply storage tank and the gas flow value or the leakage pressure value of the EGR valve and the leakage gas flow value in the gas flow comparison analysis module, the number U of classes, the relevant parameters of the classification tree method, including the number L of classification tree trunks, the maximum amplitude and the maximum number of classification tree branches The number γ parameter of the mutant tail branches; Step 2, initialize an initial population with L classification tree trunks, where each classification tree trunk is an I*2-dimensional gas output boundary matrix Π p , in the form of Each column of it is a gas output of the pressure values and gas flow values of two gas supply storage tanks within a class or the pressure value of EGR valve leakage and the leakage gas flow value Step 3, for each classification tree trunk l in the loop, calculate its ratio suitability value; Step 4, obtain the number of classification branches of each classification tree trunk Step 5, perform a branching operation on each classified tree trunk to generate classified tree branches, and each classified tree branch is also an I*2-dimensional gas output definition matrix; Step 6, calculate the ratio suitability value of each classification tree branch; Step 7, randomly select γ classification tree trunks from the classification tree trunk population, perform a mutation operation on each classification tree trunk, and each classification tree trunk generates 1 mutant tail branch. Similarly, each mutant tail branch is a I*2-dimensional gas output quantity definition matrix; Step 8, calculate the ratio suitability value of each mutant tail branch; Step 9, in the population containing all classification tree trunks and tail branches, retain the best individual as one of the classification tree trunks in the next generation, and then randomly select the other L - 1 classification tree trunks from the remaining individuals based on the probability formula; Step 10: Use the classification tree trunk population obtained in step 9 as the classification tree trunks in the next generation, and perform the next iteration, that is, start from step 3 again until convergence, and finally obtain the optimal strategy.

7. The leak detection method for the EGR valve leak detection fixture structure according to claim 6, characterized in that, Each classification tree trunk, classification tree branch, and mutation tail branch in step 2, step 5, and step 7 is a gas output quantity definition matrix Π of I * 2 dimensions p , in the form of The two elements in each column thereof are gas output quantities of the pressure values and gas flow values of two gas supply storage tanks within a class or the pressure value of EGR valve air leakage and the air leakage gas flow value All classification tree trunks, classification tree branches, and mutant tail branches are collectively referred to as the population, and each classification tree trunk, classification tree branch, or mutant tail branch is called an individual; The proportional fitness value of each individual in step 3, step 6, and step 8 is the sum of the gas supply tank pressure value and the gas flow value or the EGR valve leakage pressure value and the leakage gas flow value obtained from the gas output of all gas supply tanks' pressure values and gas flow values or EGR valve leakage pressure values and leakage gas flow values in the individual, that is 8. The leak detection method for the EGR valve leak detection fixture structure according to claim 6, characterized in that, The branching operation in step 5 includes the following steps: 1) Generate a random number: 2) Randomly select O columns from the classification tree trunk Π l ; 3) Calculate the variable h = rand(0, A l ); 4) Execute If If The mutation operation in step 7 includes the following steps: Generate random numbers: Randomly select O columns from the classification tree trunk Π l ; Calculate the mutation coefficient f = Gaussian(1, 1); Execute 9. A leak detection fixture structure for an EGR valve, characterized in that, Implement the leak detection method for the EGR valve leak detection fixture structure described in any one of claims 1 to 8. The structure includes a high-pressure gas supply storage tank (5), and the high-pressure gas supply storage tank (5) is connected to a three-way connector (3) through a gas pipe (2); one air outlet of the three-way connector (3) is connected to the gas supply storage tank pressure detection port (101) of a flow-type leak detector (1) through a gas pipe (2). On the gas supply storage tank pressure detection port (101), the current gas supply storage tank pressure value and the current gas supply storage tank gas flow value are detected through the installed gas supply storage tank pressure detection induction sheet (102), and the detected current gas supply storage tank pressure value and the current gas supply storage tank gas flow value are transmitted to the gas flow comparison and analysis module (103) installed inside the flow-type leak detector (1); The air outlet at the other end of the three-way connector (3) is connected to the intake end (401) of the EGR valve (4) through an air pipe (2); the intake end (401) is connected to the outlet end (403) of the EGR valve (4) through the opening valve core (402) of the EGR valve (4); the outlet end (403) is connected to the EGR valve air leakage detection port (104) of the flow-type leak detector (1) through an air pipe (2), and the current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value are detected through the EGR valve air leakage detection induction piece (105) installed on the EGR valve air leakage detection port (104), and the detected current EGR valve air leakage pressure value and the current EGR valve air leakage gas flow value are transmitted to the gas flow comparison and analysis module (103) installed inside the flow-type leak detector 1; The air supply storage tank pressure detection port (101) and the EGR valve air leakage detection port (104) are both output through the gas collection channel (106) installed inside the flow-type leak detector (1).

10. Application of a leak detection method for the leak detection fixture structure of an EGR valve as described in any one of claims 1-8 in the detection of vehicle engine components, characterized in that, This application uses the EGR valve leak detection fixture structure described in claim 9 to perform EGR valve leak detection.

Images