Method and device for analyzing high-temperature durability of passenger car particle trap
The thermal expansion deformation of the particle trap is measured by a thermal expansion meter and a micrometer, and combined with the packaging gap, the problem of difficult to quickly and accurately analyze the high-temperature durability of the passenger vehicle particle trap in the prior art is solved, and the rapid and accurate high-temperature durability is achieved. Sexual judgment reduces equipment and site investment.
Patent Information
- Application Number
- CN202410758133.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2024-12-17
AI Technical Summary
The existing technology is difficult to quickly and accurately analyze the durability of passenger car particle traps at high temperatures. The traditional method requires long-term engine mounts or vehicle road durability tests, and the inside of the packaging cannot be directly observed, resulting in the inability to judge the parts in a timely manner. Does thermal expansion deformation lead to fragmentation?
Use thermal expansion meter and micrometer to measure the thermal expansion deformation of the particle trap, draw the thermal expansion coefficient curve, and combine the packaging gap to judge the high-temperature durability of the parts by the maximum exhaust temperature of the engine, shorten the analysis cycle, reduce equipment and site investment, and improve analysis Intuition and accuracy of results.
Through this method, we can quickly and accurately judge the durability of the particle trap at high temperatures, greatly shorten the cycle, small equipment investment, intuitive and accurate analysis results, and timely judge whether the parts meet the requirements of use under high temperature conditions.
Smart Images
Figure CN119147574A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of automobiles, and relates to a high temperature durability analysis method and device for a particulate filter of a passenger car. Background Art
[0002] The pollutants discharged by the engine are mainly divided into gaseous pollutants and particulate matter. The main function of the particulate filter of gasoline vehicles is to filter particulate matter, which can reduce the soot generated by the engine by more than 90%. Since the exhaust temperature of the engine can reach up to 900℃, the working environment of the particulate filter is very harsh, and strict requirements are placed on the high temperature durability of the parts.
[0003] The particulate filter is wrapped with a gasket and encapsulated in the exhaust catalyst through extrusion, and fits tightly with the packaging shell. Under high temperature conditions, the extrusion and fragmentation caused by the expansion and deformation of the parts is the main cause of its high-temperature failure. At present, the industry's durability analysis of particulate filters at high temperatures is mainly verified by engine benches or vehicle road durability tests. Not only does it require a long cycle and large investment, but because it is encapsulated inside the exhaust catalyst, it cannot be directly observed. It can only be read through the engine or vehicle data when it completely fails and affects performance. It is impossible to know the time when the fragmentation and failure begin. Therefore, how to quickly and accurately analyze whether the particulate filter meets the high-temperature durability requirements is an extremely difficult task.
[0004] Patent document CN102967467A provides a method for evaluating the durability of a particulate filter, which determines whether the durability of the particulate filter meets the standard by comparing the pollutant data of the initial emission and the load emission of the diesel engine. The present invention introduces a method for analyzing the high-temperature durability of a particulate filter for a passenger car, which determines whether the high-temperature durability is qualified by comparing the thermal deformation of the particulate filter and the packaging gap at high temperature, and the two are unrelated.
[0005] Patent document CN110759746A discloses a gasoline engine particulate filter with low back pressure and high durability, which can maintain a high porosity while using a higher concentration of pores and cooperating with fibrous additives, and connect isolated pores through a fiber structure to become long strips of crystalline phase pores. The invention patent introduces a high-temperature durability analysis method for a passenger car particulate filter, which determines whether the high-temperature durability is qualified by comparing the thermal deformation of the particulate filter and the packaging gap at high temperatures. The two are unrelated.
[0006] Patent document CN102614724A discloses a plugging material for low expansion wall-flow honeycomb ceramics. The expansion coefficient of the plugging material is controllable and adjustable, and can match the expansion coefficient of the honeycomb ceramic material, greatly improving the bonding strength between the plugging material and the honeycomb ceramic pore wall, thereby effectively improving the thermal shock resistance. The present invention introduces a high-temperature durability analysis method for a passenger car particulate filter. By testing the thermal deformation of the particulate filter at high temperature and the packaging gap, it is judged whether the high-temperature durability is qualified. The two are unrelated. Summary of the invention
[0007] The technical problem to be solved by the present invention is to overcome the above-mentioned problems existing in the prior art and provide a high temperature durability analysis method and device for a particulate filter of a passenger car.
[0008] The purpose of the present invention is to invent a high-temperature durability analysis method for a passenger car particulate filter. Compared with the engine bench test or vehicle road durability test verification method commonly used in the industry, this method uses a thermal expansion meter and a micrometer to accurately measure the deformation of the particulate filter as the temperature rises, thereby obtaining a thermal expansion coefficient curve that changes with temperature. Combined with the packaging gap and the maximum exhaust temperature of the engine, it is possible to accurately judge whether the thermal expansion deformation of the parts under the maximum exhaust temperature of the engine will cause fragmentation. Compared with traditional methods, this method has a greatly shortened cycle, requires simple equipment and site investment, saves costs, and the analysis results are more intuitive and accurate.
[0009] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0010] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:
[0011] A high temperature durability analysis method for a particulate filter of a passenger car comprises the following steps: sampling a sample; testing the initial length of the sample; applying a load of 0.1 to 1 N; controlling the temperature to rise to 1000° C.; continuously recording the length change of the sample at a corresponding temperature T; drawing a thermal expansion deformation curve; obtaining a maximum expansion deformation according to a maximum exhaust temperature of an engine; and comparing a packaging gap to determine whether the high temperature durability is qualified.
[0012] Furthermore, the size and shape of the sample are determined by the sample support system; the shape is a square column or a cylinder, the width and thickness of the square column are 5 mm, and the diameter of the cylinder is 5 mm;
[0013] Furthermore, the initial length of the test sample is measured at room temperature of 15° C. to 30° C. using a micrometer, with the measurement value accurate to 0.1%.
[0014] Furthermore, the load of 0.1 to 1 N is applied by placing the sample on a thermal expansion instrument support, pushing a push rod of the thermal expansion instrument to the top of the sample and applying a load of 0.1 to 1 N.
[0015] Furthermore, the temperature is controlled to rise to 1000° C. by using a temperature control device to control the temperature to rise at a rate of 5° C. / min and stop at 1000° C.
[0016] Furthermore, the continuous recording of the length change of the sample at the corresponding temperature T is to use a displacement measuring device and a temperature measuring device to continuously measure and record the length change of the sample at the corresponding temperature T during the entire test process.
[0017] Further, the measurement is performed at least twice without moving the test specimen, and at least two specimens are measured.
[0018] Furthermore, a thermal expansion deformation curve of the particulate filter is drawn according to the sample length measured at different temperatures T; according to the maximum exhaust temperature of the engine, the maximum expansion deformation of the particulate filter at the corresponding temperature is found in the thermal expansion deformation curve, and compared with the packaging gap. If the maximum expansion deformation is less than the packaging gap, the high-temperature durability is judged to be qualified; if it is greater than or equal to the packaging gap, the high-temperature durability is judged to be unqualified.
[0019] A high temperature durability analysis device for a particulate filter of a passenger car, comprising:
[0020] A test module, used to test the initial length of the sample;
[0021] The length change recording module is used to apply a load of 0.1 to 1N to the sample; control the temperature to rise to 1000°C; and continuously record the length change of the sample at the corresponding temperature T;
[0022] A curve drawing module is used to draw a thermal expansion deformation curve of the particle collector according to the sample length measured at different temperatures T;
[0023] The comparison module is used to obtain the maximum expansion deformation according to the maximum exhaust temperature of the engine; and to compare the packaging gap to determine whether the high-temperature durability is qualified.
[0024] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the high-temperature durability analysis method for a particulate filter of a passenger vehicle as described above.
[0025] Compared with the prior art, the present invention has the following beneficial effects:
[0026] Compared with the commonly used engine bench test or vehicle road durability test verification method in the industry, the present invention uses a thermal expansion meter and a micrometer to accurately measure the deformation of the particulate filter as the temperature rises, thereby obtaining a thermal expansion coefficient curve that changes with temperature. Combined with the packaging gap and the maximum exhaust temperature of the engine, it is possible to accurately judge whether the thermal expansion deformation of the parts under the maximum exhaust temperature of the engine will cause fragmentation. Compared with traditional methods, this method has a greatly shortened cycle, requires simple equipment and site, requires small investment, saves costs, and the analysis results are more intuitive and accurate. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] The present invention will be further described below in conjunction with the accompanying drawings:
[0028] Figure 1 A flow chart of a high temperature durability analysis method for a particulate filter of a passenger vehicle is provided in accordance with an embodiment of the present invention. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The embodiments of the present invention are described in detail below in conjunction with the drawings.
[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.
[0031] The present invention is described in detail below in conjunction with the accompanying drawings:
[0032] A high temperature durability analysis method for a passenger car particulate filter, see Figure 1 , including the following steps:
[0033] 1. The size and shape of the test specimen are determined by the specimen support system. The shape is usually a square column or a cylinder. The width and thickness of the square column are about 5mm, and the diameter of the cylinder is about 5mm;
[0034] 2. At room temperature of 15℃-30℃, use a micrometer to measure the length L0 of the sample, and the measurement value is accurate to 0.1%;
[0035] 3. Remove the contaminants on the sample and the thermal expansion instrument bracket, and place the sample on the thermal expansion instrument bracket;
[0036] 4. Push the top rod of the thermal expansion instrument to the top of the sample and apply a load of 0.1 to 1N;
[0037] 5. Use the temperature control device to control the temperature to rise at a rate of 5°C / min until it reaches 1000°C;
[0038] 6. Use displacement measuring device and temperature measuring device to continuously record the length change of the sample at the corresponding temperature T during the entire test process;
[0039] 7. The measurement should be carried out at least twice without moving the test specimen, and at least two specimens should be measured;
[0040] 8. Based on the sample length L measured at different temperatures T, draw the thermal expansion deformation curve of the particle collector.
[0041] 9. According to the maximum exhaust temperature of the engine, find the maximum expansion deformation of the particulate filter at the corresponding temperature in the thermal expansion deformation curve, and compare it with the packaging gap. If the maximum expansion deformation is less than the packaging gap, the high-temperature durability is judged to be qualified; if it is greater than or equal to the packaging gap, the high-temperature durability is judged to be unqualified.
[0042] A high temperature durability analysis device for a particulate filter of a passenger car, comprising:
[0043] A test module, used to test the initial length of the sample;
[0044] The length change recording module is used to apply a load of 0.1 to 1N to the sample; control the temperature to rise to 1000°C; and continuously record the length change of the sample at the corresponding temperature T;
[0045] A curve drawing module is used to draw a thermal expansion deformation curve of the particle collector according to the sample length measured at different temperatures T;
[0046] The comparison module is used to obtain the maximum expansion deformation according to the maximum exhaust temperature of the engine; and to compare the packaging gap to determine whether the high-temperature durability is qualified.
[0047] Before introducing the cost-reducing supplier B for the T90 PHEV model particulate filter, it was necessary to analyze whether the durability of the supplier's products at high temperatures was qualified. At that time, the PHEV engine had not completed bench calibration and did not meet the conditions for engine bench verification. In order to quickly analyze and judge, this method was used to analyze the high-temperature durability of the parts. The process is as follows:
[0048] 1. Take a 5mm long sample, raise the temperature from 30℃ to 1000℃ at a rate of 5℃ / min, and draw a thermal expansion deformation curve based on the data;
[0049] 2. The diameter of the particle collector is 118.4mm, and the maximum exhaust temperature of the engine is 850℃. According to the thermal expansion deformation curve, the increase in diameter due to thermal expansion is 0.1729mm at 850℃.
[0050] 3. In comparison, the gap of the catalyst package is 0.4mm. Therefore, it is judged that the thermal expansion deformation of the product at a temperature of 850°C can meet the packaging requirements, and its high-temperature durability meets the requirements for the use of the engine.
[0051] The present invention also provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, a high-temperature durability analysis method for a particulate filter for a passenger vehicle is implemented. The high-temperature durability analysis method for a particulate filter for a passenger vehicle comprises the following steps:
[0052] S1 initial length of the test specimen;
[0053] S2 applies a load of 0.1 to 1 N;
[0054] S3 controls the temperature to rise to 1000°C;
[0055] S4 continuously records the length change of the sample at the corresponding temperature T;
[0056] S5 draws the thermal expansion deformation curve;
[0057] S6 obtains the maximum expansion deformation based on the maximum exhaust temperature of the engine; compares the packaging gap to determine whether the high-temperature durability is qualified.
[0058] The computer-readable storage medium provided by the present invention has computer-executable instructions that are not limited to the method operations described above, but can also execute related operations in the high-temperature durability analysis method for a particulate filter for a passenger vehicle provided by any embodiment of the present invention.
[0059] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in this application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.
[0060] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loading and executing computer program instructions on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be transmitted from a website site, a computer, a server or a data center to another website site, a computer, a server or a data center by wired (for example, coaxial cable, optical fiber, digital subscriber line DSL) or wireless (for example, infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, a data center, etc. that contains one or more available media integrated. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid-state hard disk Solid State Disk, SSD), etc.
[0061] The above is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any modification, equivalent replacement and improvement made by any person skilled in the art within the technical scope disclosed by the present invention and within the spirit and principle of the present invention shall be covered within the protection scope of the present invention. At the same time, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.
Claims
1. A high temperature durability analysis method for a passenger car particulate filter, characterized in that: It includes sample sampling; testing the initial length of the sample; applying a load of 0.1 to 1N; controlling the temperature to rise to 1000°C; continuously recording the length change of the sample at the corresponding temperature T; drawing a thermal expansion deformation curve; obtaining the maximum expansion deformation based on the maximum exhaust temperature of the engine; and comparing the packaging gap to determine whether the high-temperature durability is qualified.
2. The high temperature durability analysis method for a particulate filter for a passenger vehicle according to claim 1, characterized in that: The size and shape of the sample are determined by the sample support system; the shape is a square column or a cylinder, the width and thickness of the square column are 5 mm, and the diameter of the cylinder is 5 mm.
3. The high temperature durability analysis method for a particulate filter for a passenger vehicle according to claim 1, characterized in that: The initial length of the test sample is measured at room temperature of 15° C. to 30° C. using a micrometer, with the measurement value accurate to 0.1%.
4. The high temperature durability analysis method for a particulate filter for a passenger vehicle according to claim 1, characterized in that: The load of 0.1-1N is applied by placing the sample on a thermal expansion instrument support, pushing a push rod of the thermal expansion instrument to the top of the sample and applying a load of 0.1-1N.
5. The high temperature durability analysis method for a particulate filter for a passenger vehicle according to claim 1, characterized in that: The temperature is controlled to rise to 1000° C. by using a temperature control device, and the temperature is controlled to rise at a speed of 5° C. / min and stop at 1000° C.
6. The high temperature durability analysis method for a particulate filter for a passenger vehicle according to claim 1, characterized in that: The continuous recording of the length change of the sample at the corresponding temperature T is to use a displacement measuring device and a temperature measuring device to continuously measure and record the length change of the sample at the corresponding temperature T during the entire test process.
7. The high temperature durability analysis method for a particulate filter for a passenger vehicle according to claim 6, characterized in that: The measurement is performed at least twice without moving the test specimen, and at least two specimens are measured.
8. The high temperature durability analysis method for a particulate filter for a passenger vehicle according to claim 1, characterized in that: According to the sample length measured at different temperatures T, the thermal expansion deformation curve of the particulate filter is drawn; according to the maximum exhaust temperature of the engine, the maximum expansion deformation of the particulate filter at the corresponding temperature is found in the thermal expansion deformation curve, and compared with the packaging gap. If the maximum expansion deformation is less than the packaging gap, the high-temperature durability is judged to be qualified; if it is greater than or equal to the packaging gap, the high-temperature durability is judged to be unqualified.
9. A high temperature durability analysis device for a particulate filter of a passenger car, characterized in that: include: A test module, used to test the initial length of the sample; The length change recording module is used to apply a load of 0.1 to 1N to the sample; Control the temperature to rise to 1000°C; continuously record the length change of the sample at the corresponding temperature T; A curve drawing module is used to draw a thermal expansion deformation curve of the particle collector according to the sample length measured at different temperatures T; The comparison module is used to obtain the maximum expansion deformation according to the maximum exhaust temperature of the engine; and to compare the packaging gap to determine whether the high-temperature durability is qualified.
10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method according to any one of claims 1 to 8 is implemented.