CN117782944A - Method for detecting porosity of automobile exhaust purification filter - Google Patents
Method for detecting porosity of automobile exhaust purification filter Download PDFInfo
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- CN117782944A CN117782944A CN202410210886.6A CN202410210886A CN117782944A CN 117782944 A CN117782944 A CN 117782944A CN 202410210886 A CN202410210886 A CN 202410210886A CN 117782944 A CN117782944 A CN 117782944A
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- 238000000746 purification Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims description 29
- 238000001514 detection method Methods 0.000 claims abstract description 41
- 230000000903 blocking effect Effects 0.000 claims abstract description 22
- 239000011159 matrix material Substances 0.000 claims description 25
- 230000009466 transformation Effects 0.000 claims description 8
- 230000001131 transforming effect Effects 0.000 claims description 4
- 208000012661 Dyskinesia Diseases 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000000007 visual effect Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000000919 ceramic Substances 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000011002 quantification Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention belongs to a detection method for the porosity of an automobile exhaust purification filter, wherein an airflow power system of a detection station sends airflow into a filter to be detected from bottom to top, a roller main disc contacts the airflow from the upper part of the filter to be detected, and rollers on the roller main disc are in one-to-one correspondence with through holes of the filter to be detected; the video observation system collects the movement of the roller into a coordinate system, the video observation system calculates the movement speed, movement direction and angular speed of the roller, and feeds back the calculation result to the database, and finally the calculation result is written into the electronic tag matched with the filter through the card writing equipment. The invention adopts the mode of synchronous working of air flow and visual detection, and is matched with the roller on the roller main disc to represent the real blocking condition of the through hole on the filter, and index quantitative data comprise the rate of the through hole, the blocking coordinate of the through hole and the blocking degree of the through hole, so that the invention has reasonable design and comprehensive detection, is beneficial to controlling the production cost and the maintenance cost, and is suitable for large-scale popularization.
Description
Technical Field
The invention belongs to the technical field of production and detection of automobile exhaust purification filters, and particularly relates to a detection method of the porosity of an automobile exhaust purification filter.
Background
The automobile exhaust purifier is used for filtering automobile exhaust, and ceramic honeycomb carrier and catalyst are used as filtering main bodies at present to control automobile exhaust pollution and reduce carbon monoxide, black smoke and other toxic gas emissions. As the exhaust gas passes through the reducing honeycomb ceramics, the nitrogen oxides are first decomposed into nitrogen and oxygen. As the exhaust gas passes further through the oxidizing ceramic honeycomb, the carbon monoxide and hydrocarbons are further oxidized to carbon dioxide and water. The oxygen generated in the previous stage is also helpful for the oxidation reaction, especially for the engine with high compression ratio, and the concentration of the oxygen generated in the reduction reaction is obviously increased due to the higher concentration of the discharged nitrogen oxides. In order to ensure the filtration performance of the filter, it is necessary to perform a through-hole rate detection of the purifier before shipment and in terms of maintenance of the purifier.
At present, methods for detecting the porosity of a filter mainly comprise an air pressure detection method and a visual detection method, such as the detection method disclosed in the prior patent CN104914027A for detecting the porosity of an automobile exhaust gas purifying filter, a device for detecting the porosity of a ceramic carrier by using a high-energy parallel light source disclosed in the patent CN202166586U, and a device for detecting the porosity of a brake disc vent hole disclosed in the patent CN215449020U, wherein the detection methods and the detection devices can realize the detection of the porosity, but the fault holes affecting the porosity cannot realize positioning, and the degree of interference of the opening of the fault holes on the porosity and the filtering performance cannot be quantified, so that the filter with the problem of the porosity is detected also required to be subjected to a series of investigation and maintenance, and the production cost and the maintenance cost are increased.
Disclosure of Invention
Aiming at the technical problems in the aspect of detecting the through hole rate of the tail gas filter, the invention provides a detection method for the through hole rate of the automobile tail gas purifying filter, which has reasonable design, comprehensive detection and is beneficial to controlling the production cost and the maintenance cost.
In order to achieve the above purpose, the technical scheme adopted by the invention is that the detection method of the through hole ratio of the automobile exhaust purification filter comprises the following steps:
s1, sequentially conveying a filter to be detected to a detection station through a conveying belt, so that the filter to be detected corresponds to an air flow power system, a roller main disc and a video observation system of the detection station;
s2, feeding air flow into the filter to be tested from bottom to top by an air flow power system of the detection station, enabling a roller main disc to contact the air flow from the upper part of the filter to be tested, enabling rollers on the roller main disc to correspond to through holes of the filter to be tested one by one, and enabling the rollers to generate corresponding movement by the air flow;
s3, the video observation system collects the movement of the roller into a coordinate system, the video observation system calculates the movement speed, movement direction and angular speed of the roller and feeds back calculation results to a database, wherein the calculation results comprise the through hole rate, the through hole blockage coordinates and the through hole blockage degree; the through hole rate is judged by the number of normal or abnormal movements of the roller, and the coordinates of the blocked through holes are obtained; the blocking degree of the through hole is judged according to the movement direction and the angular speed of the roller;
s4, the database reports the data detected each time to card writing equipment;
s5, the card writing equipment writes the detection result of the corresponding filter into the electronic tag of the filter.
Preferably, in step S3, the camera is used to image all the rollers, each roller is provided with two marks, and the image coordinates of the two marks F, S of a certain roller on the roller main disc at the i-th frame image are respectively:andthe method comprises the steps of carrying out a first treatment on the surface of the The roller speed is calculated by using a time interpolation method, and the calculation formula is as follows，Such asThe uneven deviation of the roller direction is shown, the through hole is blocked,0, the through hole corresponding to the roller is completely blocked, and the position of the blocked hole is obtained through the image coordinates; according to the formulaAnd calculating to obtain the through hole rate, wherein N is the number of plugged holes, and N is the total number of the through holes.
Preferably, the relationship between the pixel coordinates, the image coordinates, the camera coordinates and the spatial coordinates is expressed by a matrix:
=wherein, the method comprises the steps of, wherein,is the pixel coordinates of a point in the image,in the form of a spatial coordinate system,for transforming matrixThe method comprises the steps of carrying out a first treatment on the surface of the Make its inner ream=1, solving the matrix to obtain:the method comprises the steps of carrying out a first treatment on the surface of the Taking the image coordinates of 4 fixed points on the roller main disc and the position relation of the 4 fixed points, solving the unknown number, and obtaining the space coordinates corresponding to a certain point in the image by utilizing the obtained unknown number and the image coordinates of the certain point, namely；
Solving the space coordinates of the two marks according to the transformation relation matrix and the image coordinates of the two marks passing through the center line of the roller mounting hole corresponding to the transformation relation matrix, and recording the space coordinates in the matrix A and the matrix B, namely:
A=and，
calculating the slope of a connecting line of two points according to the space coordinates of the two characteristic points, wherein the slope calculation formula is as follows:；
azimuth angle of roller in ith frame，The calculation formula is as follows:；
the through holes corresponding to the rollers are smooth;explaining the full blocking of the through holes corresponding to the rollers;indicating that the hole corresponding to the roller is blocked, andthe smaller the value, the more severe the blockage, according toAt least 3 different clogging degree levels D1, D2, D3 are divided.
Preferably, let theThe calculation formula for the offset angular velocity of the roller is as follows:the method comprises the steps of carrying out a first treatment on the surface of the Wherein the method comprises the steps of=0 indicates that the through hole corresponding to the roller is clear or full-blocked;if the change exists, the situation that the through hole corresponding to the roller is blocked is indicated;
will beAndrecorded in matrices G and H:
=and H=。
Preferably, the aerodynamic system provides a constant pressure P1 and a constant pressure P2 for the detection station respectively in two periods of time T1 and T2, and the video observation system calculates the offset angular velocity in the periods T1 and T2Andcalculating the length L blocked by the blocked through hole according to the formula, wherein the calculation formula is as follows:
wherein D is the diameter of the through hole, K is the airflow blocking factor, and mu is a constant coefficient.
Compared with the prior art, the invention has the advantages and positive effects that:
1. according to the detection method for the through hole rate of the automobile exhaust purification filter, provided by the invention, the mode of synchronous operation of air flow and visual detection is adopted, the real blocking condition of the through hole on the filter is represented by matching with the roller on the roller main disc, effective through hole rate, through hole blocking coordinate and through hole blocking degree data are obtained in an index quantification mode, and the detection result is finally written into the electronic tag matched with the filter, so that the design is reasonable, the detection is relatively comprehensive, the production efficiency is improved, the control of the production cost and the maintenance cost is facilitated, and the detection method is suitable for large-scale popularization.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram of the operation of a test station provided by an embodiment;
FIG. 2 is a top view of a roller main disc provided by an embodiment;
in the above figures, 1, an airflow power system; 2. a roller main disc; 3. a video observation system; 4. filters to be tested (ceramic honeycomb carriers).
Detailed Description
In order that the above objects, features and advantages of the invention will be more clearly understood, a further description of the invention will be rendered by reference to the appended drawings and examples. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other. For convenience of description, the words "upper", "lower", "left" and "right" are merely used herein to denote a correspondence with the upper, lower, left, and right directions of the drawing figures, and are not limiting on the structure.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as described herein, and therefore the present invention is not limited to the specific embodiments of the disclosure that follow.
As shown in fig. 1 and 2, the method for detecting the porosity of the automobile exhaust purification filter provided by the invention comprises the following steps:
s1, sequentially conveying a filter to be detected (ceramic honeycomb carrier) to a detection station through a conveying belt, and enabling the filter to be detected 4 to correspond to an air flow power system 1, a roller main disc 2 and a video observation system 3 of the detection station;
s2, feeding air flow into the filter 4 to be tested from bottom to top by an air flow power system of the detection station, enabling the roller main disc 2 to contact the air flow from the upper part of the filter to be tested, enabling the rollers 21 on the roller main disc 2 to correspond to through holes of the filter to be tested one by one, and enabling the rollers to generate corresponding movement by the air flow;
s3, the video observation system collects the movement of the roller 21 into a coordinate system, the video observation system 3 calculates the movement speed, movement direction and angular speed of the roller 21 and feeds back calculation results to a database, wherein the calculation results comprise the through hole rate, the through hole blockage coordinates and the through hole blockage degree; wherein the through hole ratio is judged by the number of normal movements or abnormal movements of the roller 21, and the coordinates of the blocked through holes are obtained at the same time; the blocking degree of the through hole is judged according to the movement direction and the angular speed of the roller;
s4, the database reports the data detected each time to card writing equipment;
s5, the card writing equipment writes the detection result of the corresponding filter into the electronic tag of the filter.
In order to realize quantification of the through hole rate detection result, in step S3, the invention uses a camera to shoot images of all the rollers, each roller is provided with two marks, namely, a front mark and a rear mark, and the image coordinates of two marks F, S of a certain roller on a roller main disc in an ith frame image are respectively as follows:andthe method comprises the steps of carrying out a first treatment on the surface of the The roller speed is calculated by using a time interpolation method, and the calculation formula is as follows，Such asThe uneven deviation of the roller direction is shown, the through hole is blocked,0, the through hole corresponding to the roller is completely blocked, and the position of the blocked hole is obtained through the image coordinates; according to the formulaAnd calculating to obtain the through hole rate, wherein N is the number of plugged holes, and N is the total number of the through holes.
Coordinates in a spatial coordinate systemBy the formula:
==transforming into coordinates of camera coordinate system in matrix transformation modeThe method comprises the steps of carrying out a first treatment on the surface of the Wherein R is a 3x3 rotation matrix, which is an identity orthogonal matrix; 1 is a translation vector of 3x 1;is a 4x4 transform matrix;= T ；
camera coordinate system coordinatesCoordinate with image coordinate system：，The method comprises the steps of carrying out a first treatment on the surface of the The transformation relation between the image coordinate system and the world coordinate system in the visual image system is as follows:=the method comprises the steps of carrying out a first treatment on the surface of the Wherein,the length is taken as the image coordinate, and the relation between the length coordinate and the pixel coordinate in the image is also required to be obtained; pixel coordinates areIts length coordinate isThe relationship between the pixel coordinates and the image coordinates is:，expressed as a matrix:=。
the relationship of the camera coordinates to the spatial coordinates with respect to the pixel coordinates, the image coordinates is represented by a matrix as:
=wherein, the method comprises the steps of, wherein,for a certain one of the imagesThe pixel coordinates of the point are used,in the form of a spatial coordinate system,for transforming matrixThe method comprises the steps of carrying out a first treatment on the surface of the Make its inner ream=1, solving the matrix to obtain:the method comprises the steps of carrying out a first treatment on the surface of the Taking the image coordinates of 4 fixed points such as a1, a2, a3 and a4 on the roller main disc and the position relation of the 4 fixed points, solving the unknown number,using the obtained unknown number and the image coordinates of a certain point in the image, the spatial coordinates corresponding to the point can be obtained, namely；
Solving the space coordinates of the two marks according to the transformation relation matrix and the image coordinates of the two marks passing through the center line of the roller mounting hole corresponding to the transformation relation matrix, and recording the space coordinates in the matrix A and the matrix B, namely:
A=and，
calculating the slope of a connecting line of two points according to the space coordinates of the two characteristic points, wherein the slope calculation formula is as follows:；
azimuth angle of roller in ith frame，The calculation formula is as follows:；
the through holes corresponding to the rollers are smooth;explaining the full blocking of the through holes corresponding to the rollers;indicating that the hole corresponding to the roller is blocked, andthe smaller the value, the more severe the blockage, according toAt least 3 different blockage levels D1, D2 and D3 are divided, the blockage levels are lower, the blockage levels can be cleaned in a simple air blowing mode, or the blockage levels are not cleaned or are not reworked, and the blockage levels are higher, the blockage levels are required to be processed in a necessary mode so as to meet the requirement of the through hole level.
In order to improve the detection comprehensiveness of the blocking situation, the method of the invention enablesThe calculation formula for the offset angular velocity of the roller is as follows:the method comprises the steps of carrying out a first treatment on the surface of the Wherein the method comprises the steps of=0 indicates that the through hole corresponding to the roller is clear or full-blocked;if the change exists, the situation that the through hole corresponding to the roller is blocked is indicated;
will beAndrecorded in matrices G and H:
=and H=。
Further, the aerodynamic system provides a constant pressure P1 and a constant pressure P2 for the detection station in two periods of time T1 and T2 respectively, and the video observation system calculates the offset angular velocity in the periods T1 and T2Andcalculating the length L blocked by the blocked through hole according to the formula, wherein the calculation formula is as follows:
wherein D is the diameter of the through hole, K is the airflow blocking factor, and mu is a constant coefficient, so that the actual blocking conditions of different blocking holes can be quantified.
The invention adopts the mode of synchronous working of air flow and visual detection, and the real blocking condition of the through hole on the filter is represented by matching with the roller on the roller main disc, and effective through hole rate, through hole blocking coordinate and through hole blocking degree data are obtained by an index quantification mode, and the detection result is finally written into the electronic tag matched with the filter.
The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention without departing from the technical content of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (5)
1. A detection method of the through hole rate of an automobile exhaust purification filter comprises the following steps:
s1, sequentially conveying a filter to be detected to a detection station through a conveying belt, so that the filter to be detected corresponds to an air flow power system, a roller main disc and a video observation system of the detection station;
s2, feeding air flow into the filter to be tested from bottom to top by an air flow power system of the detection station, enabling a roller main disc to contact the air flow from the upper part of the filter to be tested, enabling rollers on the roller main disc to correspond to through holes of the filter to be tested one by one, and enabling the rollers to generate corresponding movement by the air flow;
s3, the video observation system collects the movement of the roller into a coordinate system, the video observation system calculates the movement speed, movement direction and angular speed of the roller and feeds back calculation results to a database, wherein the calculation results comprise the through hole rate, the through hole blockage coordinates and the through hole blockage degree; the through hole rate is judged by the number of normal or abnormal movements of the roller, and the coordinates of the blocked through holes are obtained; the blocking degree of the through hole is judged according to the movement direction and the angular speed of the roller;
s4, the database reports the data detected each time to card writing equipment;
s5, the card writing equipment writes the detection result of the corresponding filter into the electronic tag of the filter.
2. The automobile exhaust gas purifying filter through hole ratio according to claim 1In step S3, all the rollers are imaged by a camera, each roller is provided with two marks, and the image coordinates of the two marks F, S of a certain roller on the roller master at the ith frame image are:and->；
The roller speed is calculated by using a time interpolation method, and the calculation formula is as follows，/>For example->It indicates that uneven deflection of the roller direction occurs, blocking of the through hole occurs, < + >>0, the through hole corresponding to the roller is completely blocked, and the position of the blocked hole is obtained through the image coordinates;
according to the formulaAnd calculating to obtain the through hole rate, wherein N is the number of plugged holes, and N is the total number of the through holes.
3. The method for detecting the porosity of an automobile exhaust gas purifying filter according to claim 2, wherein the relation between the pixel coordinates, the image coordinates, the camera coordinates and the spatial coordinates is expressed by a matrix as:
=/>wherein->For pixel coordinates of a point in the image, +.>For space coordinates>For transforming matrix->The method comprises the steps of carrying out a first treatment on the surface of the Let therein->=1, solving the matrix to obtain: />The method comprises the steps of carrying out a first treatment on the surface of the Taking the image coordinates of 4 fixed points on the roller main disc and the position relation of the 4 fixed points, solving the unknown number, and obtaining the space coordinates corresponding to the point by utilizing the obtained unknown number and the image coordinates of a certain point in the image, namely +.>；
Solving the space coordinates of the two marks according to the transformation relation matrix and the image coordinates of the two marks passing through the center line of the roller mounting hole corresponding to the transformation relation matrix, and recording the space coordinates in the matrix A and the matrix B, namely:
A=and->，
Calculating the slope of the connecting line of the two points according to the space coordinates of the two characteristic pointsThe calculation formula is as follows:；
azimuth angle of roller in ith frame，/>The calculation formula is as follows: />；
The through holes corresponding to the rollers are smooth; />Explaining the full blocking of the through holes corresponding to the rollers; />Indicating that the hole corresponding to the roller is blocked, and +.>The smaller the value, the more severe the blockage, according to +.>At least 3 different clogging degree levels D1, D2, D3 are divided.
4. The method for detecting the porosity of an automobile exhaust gas purifying filter according to claim 3, whereinThe calculation formula for the offset angular velocity of the roller is as follows: />The method comprises the steps of carrying out a first treatment on the surface of the Wherein->=0 indicates that the through hole corresponding to the roller is clear or full-blocked; />If the change exists, the situation that the through hole corresponding to the roller is blocked is indicated;
will beAnd->Recorded in matrices G and H:
=/>and H= =>。
5. The method for detecting the porosity of an automobile exhaust purification filter according to claim 4, wherein the aerodynamic system provides a constant pressure P1 and a constant pressure P2 to the detection station in two periods of time T1 and T2, respectively, and the video observation system calculates the offset angular velocity in T1 and T2And->Calculating the length L blocked by the blocked through hole according to the formula, wherein the calculation formula is as follows:
wherein D is the diameter of the through hole, K is the airflow blocking factor, and mu is a constant coefficient.
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