Deformation analysis method, system, storage medium and detection equipment for engine cylinder bore

Abstract

The present invention proposes a deformation analysis method, system, storage medium and detection equipment for an engine cylinder bore, the method comprising: establishing a three-dimensional solid model of parts corresponding to each part in the engine body to be tested; assembling the three-dimensional solid models corresponding to each part according to the preset engine installation requirements, and calculating the axial deformation data of the cylinder bore at different depths under the assembly condition according to the three-dimensional solid model of the engine body; calculating the axial deformation data of the cylinder bore at different depths under thermal load; obtaining a cylinder bore deformation gradient data table according to the axial deformation data of the cylinder bore at different depths under the assembly condition and under thermal load, and analogizing the cylinder bore deformation gradient data table according to the preset cylinder bore standard index to obtain the cylinder bore deformation analysis result. The deformation analysis method of the engine cylinder bore proposed by the present invention obtains a more accurate cylinder bore deformation analysis result by performing gradient analysis on different depths of the cylinder bore.

Description

Technical Field

[0001] The present invention relates to the field of vehicle internet technology, and in particular to a deformation analysis method, system, storage medium and detection equipment for an engine cylinder bore. Background Art

[0002] The cylinder block is one of the most important parts in the engine. The cylinder liner is the space where the engine piston works. The deformation of the cylinder bore has a crucial impact on the sealing of the piston ring. The speed of the piston's up and down reciprocating motion depends on the crankshaft speed. The faster the crankshaft speed, the faster the piston moves up and down. When the engine is working, the crankshaft speed can reach up to 6000 revolutions per minute. If the cylinder bore is deformed greatly, the piston moves too fast and the piston ring will not have time to adapt to the change of the cylinder bore, which will rub against the cylinder bore, causing wear of the cylinder bore and even pulling of the cylinder. Therefore, accurately obtaining the deformation of the cylinder bore during assembly and at high temperature is of great significance for warning of engine body risks.

[0003] In the prior art, a roundness meter or a three-coordinate measurement and analysis method is generally used to evaluate the deformation of an engine body. However, these two methods are difficult to simulate a high-temperature thermal load environment and cannot detect the deformation of the cylinder bore at high temperatures. At the same time, since the cylinder bore has a large axial depth, the above two analysis methods are difficult to fully detect the deformation of the cylinder bore, resulting in a low accuracy problem and great limitations in practical applications. Summary of the invention

[0004] Based on this, the purpose of the present invention is to propose a deformation analysis method, system, storage medium and detection equipment for an engine cylinder bore to solve at least one of the above problems.

[0005] According to the deformation analysis method of the engine cylinder bore proposed by the present invention, the method comprises:

[0006] Conduct finite element simulation analysis on each part of the engine body to be tested, so as to establish a three-dimensional solid model of each part corresponding to each part of the engine body to be tested;

[0007] Assembling the three-dimensional solid models corresponding to the various parts according to the preset engine installation requirements to obtain a three-dimensional solid model of the engine body, and calculating the axial deformation data of the cylinder bore under the preset path under the assembly condition according to the three-dimensional solid model of the engine body;

[0008] Adding a preset temperature value to the three-dimensional solid model of the engine body to calculate the axial deformation data of the cylinder bore in a preset path under thermal load;

[0009] A plurality of cylinder bore deformation gradient data tables are obtained in succession according to the axial deformation data of the cylinder bore in a preset path under assembly conditions and thermal loads, and the cylinder bore deformation gradient data tables are compared according to preset cylinder bore standard indicators to obtain cylinder bore deformation analysis results.

[0010] In summary, according to the above-mentioned deformation analysis method of the engine cylinder bore, by establishing an engine body solid model and performing gradient analysis on the extracted axial deformation data, a more comprehensive cylinder bore deformation result is obtained to replace the traditional detection method. Specifically, firstly, the various parts contained in the cylinder body are simulated and analyzed to establish multiple three-dimensional solid models of parts, and then all the three-dimensional solid models of parts are assembled to obtain a three-dimensional solid model of the engine body, and the axial deformation data of the cylinder bore under the preset path under the assembly condition is obtained, and then the temperature of the three-dimensional solid model of the engine body is increased to simulate the high temperature thermal load scene, and the axial deformation data of the cylinder bore under the preset path under the scene is obtained, and then the axial deformation data obtained under the assembly condition and the thermal load are respectively subjected to gradient analysis to obtain multiple cylinder bore deformation gradient data tables, so as to compare them according to the preset cylinder bore standard indicators, thereby obtaining a comprehensive cylinder bore deformation analysis result, which greatly improves the accuracy of the cylinder bore deformation analysis.

[0011] Furthermore, the engine to be tested includes an engine cylinder head, a cylinder block, a cylinder gasket, a cylinder head cover, and cylinder head bolts. The step of assembling the three-dimensional solid models corresponding to the various parts according to the preset engine installation requirements to obtain the three-dimensional solid model of the engine body includes:

[0012] Acquire the model information of the engine to be tested, and retrieve the preset cylinder bore standard index and assembly requirement description from a preset database according to the model information;

[0013] According to the assembly requirements, a preset axial force is applied to the three-dimensional solid model of the cylinder head bolt to complete the assembly of the three-dimensional solid models of each part to obtain the three-dimensional solid model of the engine body.

[0014] Furthermore, the method further comprises:

[0015] A reference circumferential angle is selected on the end surface of the cylinder hole, the reference circumferential angle being 0°, and axial deformation data of the cylinder hole is extracted at every preset angle to obtain axial deformation data at multiple circumferential angles;

[0016] The gradient analysis is performed on the axial deformation data at each circumferential angle to obtain the gradient deformation data of the cylinder bore at different depths.

[0017] Furthermore, the step of performing gradient analysis on the axial deformation data at each circumferential angle to obtain gradient deformation data of the cylinder bore at different depths also includes:

[0018] Select a first depth and a second depth from the axial deformation data at each circumferential angle, and the first depth value is recorded as h1, and the second depth value is recorded as h2;

[0019] The deformation value corresponding to the first depth and the deformation value corresponding to the second depth are respectively acquired according to the axial deformation data at the current circumferential angle, so as to calculate the cylinder bore gradient deformation data.

[0020] Furthermore, the calculation formula for obtaining the cylinder bore gradient deformation data is:

[0021]

[0022] Among them, Dg is the gradient deformation data, h2 is the second depth value in the axial deformation data at each circumferential angle, h1 is the first depth value in the axial deformation data at each circumferential angle, u1 is the deformation value corresponding to h1, and u2 is the deformation value corresponding to h2.

[0023] Furthermore, the method further comprises:

[0024] According to the model information of the engine to be tested, the movement speed of the piston at a preset depth of the cylinder hole is obtained, wherein the piston is a part matched with the cylinder hole;

[0025] The comprehensive evaluation data of the cylinder bore is obtained according to the movement speed of the piston at the preset depth of the cylinder bore and the gradient deformation data corresponding to the preset depth. The formula for obtaining the comprehensive evaluation data of the cylinder bore is:

[0026] DV=Dg×Vp

[0027] Wherein, DV is the comprehensive evaluation data of the cylinder bore at the preset depth, Dg is the gradient deformation data corresponding to the preset depth, and Vp is the movement speed of the piston at the preset depth of the cylinder bore.

[0028] Furthermore, the step of analogizing the cylinder bore deformation gradient data table according to the preset cylinder bore standard index to obtain the cylinder bore deformation analysis result includes:

[0029] Selecting a standard data range corresponding to a preset depth from the cylinder bore standard index, and determining whether the cylinder bore comprehensive evaluation data at the preset depth is within the corresponding standard data range;

[0030] If not, it is determined that the cylinder bore of the engine body to be tested is deformed.

[0031] A deformation analysis system for an engine cylinder bore according to an embodiment of the present invention comprises:

[0032] A model building module is used to perform finite element simulation analysis on each part of the engine body to be tested, so as to establish a three-dimensional solid model of each part corresponding to each part in the engine body to be tested;

[0033] A first extraction module is used to assemble the three-dimensional solid models corresponding to the various parts according to the preset engine installation requirements to obtain a three-dimensional solid model of the engine body, and calculate the axial deformation data of the cylinder bore under the preset path under the assembly condition according to the three-dimensional solid model of the engine body;

[0034] a second extraction module, for adding a preset temperature value to the three-dimensional solid model of the engine body to calculate the axial deformation data of the cylinder bore in a preset path under thermal load;

[0035] The deformation analysis module is used to successively obtain multiple cylinder bore deformation gradient data tables according to the axial deformation data of the cylinder bore in a preset path under assembly conditions and thermal loads, and to compare the cylinder bore deformation gradient data tables according to preset cylinder bore standard indicators to obtain cylinder bore deformation analysis results.

[0036] Another aspect of the present invention provides a storage medium, wherein the storage medium stores one or more programs, which, when executed, implement the above-mentioned deformation analysis method for the engine cylinder bore.

[0037] Another aspect of the present invention further provides a detection device, the detection device comprising a memory and a processor, wherein:

[0038] The memory is used to store computer programs;

[0039] When the processor is used to execute the computer program stored in the memory, the above-mentioned deformation analysis method of the engine cylinder bore is implemented.

[0040] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description or will be learned through embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A flow chart of a deformation analysis method for an engine cylinder bore according to a first embodiment of the present invention;

[0042] Figure 2 A flow chart of a deformation analysis method for an engine cylinder bore according to a second embodiment of the present invention;

[0043] Figure 3 A three-dimensional solid model of parts of an engine body in the second embodiment of the present invention;

[0044] Figure 4 Schematic diagram of the cylinder bore circumference and circumference in the second embodiment of the present invention;

[0045] Figure 5 It is a schematic diagram of axial deformation data extracted from the cylinder bore under thermal load conditions in the second embodiment of the present invention;

[0046] Figure 6 A detailed diagram of step S15 in the second embodiment of the present invention;

[0047] Figure 7 Schematic diagram of theoretical calculation of piston motion speed in the second embodiment of the present invention

[0048] Figure 8 This is a schematic structural diagram of a deformation analysis system for an engine cylinder bore according to a third embodiment of the present invention.

[0049] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0050] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0051] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0053] See also Figure 1 , which is a flow chart of a deformation analysis method for an engine cylinder bore in a first embodiment of the present invention, the method comprises steps S01 to S04, wherein:

[0054] Step S01: performing finite element simulation analysis on each part of the engine body to be tested, so as to establish a three-dimensional solid model of each part corresponding to each part in the engine body to be tested;

[0055] It can be understood that the engine body generally includes parts such as the engine cylinder head, cylinder block, cylinder gasket, cylinder head cover, cylinder head bolts, main bearing cover, etc. Using finite element simulation analysis software to build models for each part of the engine body is conducive to simulating a more realistic engine application scenario, thereby enabling a more comprehensive assessment of the deformation of the cylinder bore.

[0056] Step S02: assembling the three-dimensional solid models corresponding to the various parts according to the preset engine installation requirements to obtain a three-dimensional solid model of the engine body, and calculating the axial deformation data of the cylinder bore under the preset path under the assembly condition according to the three-dimensional solid model of the engine body;

[0057] It should be noted that in order to evaluate the deformation of the cylinder bore of the cylinder block under assembly conditions, after the three-dimensional solid models of each part are established, the three-dimensional solid models of each part will be assembled according to the preset engine installation requirements to obtain the three-dimensional solid model of the engine block under assembly conditions, and then the axial deformation data of the cylinder bore under the preset path will be extracted from the three-dimensional solid model of the engine block to conduct a more comprehensive deformation analysis of the cylinder bore.

[0058] In this step, since there are many types of engines to be tested, the preset engine installation requirements mentioned in this embodiment are installation instructions corresponding to the engine body to be tested.

[0059] Step S03: adding a preset temperature value to the three-dimensional solid model of the engine body to calculate the axial deformation data of the cylinder bore in a preset path under thermal load;

[0060] It can be understood that in this step, the preset temperature value is added to simulate the rated point operating temperature scenario. By analyzing the stress conditions of the corresponding three-dimensional solid model of the engine body under multiple rated point operating temperature scenarios, the axial deformation data of the cylinder bore under the preset path under thermal load can be obtained.

[0061] Step S04: obtaining a plurality of cylinder bore deformation gradient data tables in succession according to the axial deformation data of the cylinder bore in a preset path under assembly conditions and under thermal load, and comparing the cylinder bore deformation gradient data tables according to preset cylinder bore standard indicators to obtain cylinder bore deformation analysis results.

[0062] It should be noted that, in the present embodiment, the preset path refers to the movement path of the piston in the cylinder bore. The relevant axial deformation data need to be recorded at all positions where the piston and the cylinder bore interact, that is, all positions where there may be a risk of deformation of the cylinder bore are included in the evaluation scope, so as to ensure that the deformation evaluation is more comprehensive.

[0063] Furthermore, after obtaining the axial deformation data under assembly conditions and thermal load conditions, in order to accurately determine the deformation of the cylinder bore at different positions under the preset path, a gradient analysis is performed on the obtained axial deformation data to obtain the cylinder bore deformation gradient data at different positions. The cylinder bore deformation gradient data at all positions under the preset path are summarized to obtain a relevant deformation gradient data table. Finally, the cylinder bore deformation gradient data table is compared with the preset cylinder bore standard index corresponding to the engine to be tested. When it is found that the deformation data of a certain gradient does not meet the cylinder bore standard index, it is determined that there is a deformation risk of the cylinder bore of the engine body to be tested.

[0064] In summary, according to the above-mentioned deformation analysis method of the engine cylinder bore, by establishing an engine body solid model and performing gradient analysis on the extracted axial deformation data, a more comprehensive cylinder bore deformation result is obtained to replace the traditional detection method. Specifically, firstly, the various parts contained in the cylinder body are simulated and analyzed to establish multiple three-dimensional solid models of parts, and then all the three-dimensional solid models of parts are assembled to obtain a three-dimensional solid model of the engine body, and the axial deformation data of the cylinder bore under the preset path under the assembly condition is obtained, and then the temperature of the three-dimensional solid model of the engine body is increased to simulate the high temperature thermal load scene, and the axial deformation data of the cylinder bore under the preset path under the scene is obtained, and then the axial deformation data obtained under the assembly condition and the thermal load are respectively subjected to gradient analysis to obtain multiple cylinder bore deformation gradient data tables, so as to compare them according to the preset cylinder bore standard indicators, thereby obtaining a comprehensive cylinder bore deformation analysis result, which greatly improves the accuracy of the cylinder bore deformation analysis.

[0065] See also Figure 2 , which is a flow chart of a deformation analysis method for an engine cylinder bore in a second embodiment of the present invention, the method comprises steps S11 to S19, wherein:

[0066] S11: performing finite element simulation analysis on each part of the engine body to be tested, so as to establish a three-dimensional solid model of each part corresponding to each part of the engine body to be tested;

[0067] S12: Acquire the model information of the engine to be tested, and retrieve the preset cylinder bore standard index and assembly requirement description from the preset database according to the model information;

[0068] It is understandable that before performing deformation analysis on the engine to be tested, the model information of the engine to be tested is first identified, and then the corresponding preset cylinder bore standard index and assembly requirement description are retrieved from the database according to the model information.

[0069] S13: applying a preset axial force to the three-dimensional solid model of the cylinder head bolt according to the assembly requirement description to complete the assembly of the three-dimensional solid models of each part to obtain the three-dimensional solid model of the engine body;

[0070] Please note that Figure 3 , shown is a three-dimensional solid model of each part of the engine body. Obviously, the cylinder head is buckled on the upper end of the cylinder body. By applying axial force to the cylinder head bolts that play a fixing role, the assembly work of each part is completed to obtain a three-dimensional solid model of the engine body. In this embodiment, the size of the preset axial force is closely related to the assembly requirements. The axial force applied to the engine body of different models is different. Therefore, the preset axial force is not specifically limited in this embodiment.

[0071] S14: selecting a reference circumferential angle on the end surface of the cylinder hole, the reference circumferential angle being 0°, and extracting axial deformation data of the cylinder hole at every preset angle to obtain axial deformation data at multiple circumferential angles;

[0072] See also Figure 4 , which is a schematic diagram of the axial and circumferential directions of the cylinder bore in this embodiment, a coordinate system is established on the circumferential surface of one of the cylinder bores, and a reference circumferential angle, i.e., the starting zero degree, is set. In this embodiment, the preset angle is set to 90°, i.e., starting from the reference circumferential angle, a set of axial deformation data of the cylinder bore is extracted every 90°. Please refer to Figure 5 , which shows multiple sets of axial deformation data extracted from the cylinder bore under thermal load conditions. Figure 5 It can be seen from the data shown that the axial deformation data extracted from different circumferential angles of the same cylinder bore are different, which is conducive to a more comprehensive assessment of the deformation of the cylinder bore.

[0073] It should be noted that, in this embodiment, regardless of whether it is under assembly conditions or thermal load conditions, the axial deformation data extraction of the cylinder bore will select multiple different circumferential angles, that is, the deformation analysis method under these two conditions is the same, so in the subsequent schemes, the working condition scenario will not be described again, and in other embodiments of the invention, the preset angle can also be set smaller to obtain more detailed axial deformation data of the cylinder bore.

[0074] S15: performing gradient analysis on the axial deformation data at each circumferential angle to obtain gradient deformation data of the cylinder bore at different depths;

[0075] For further information, see Figure 6 , step S15 further includes steps S151 to S152, wherein:

[0076] S151: Selecting a first depth and a second depth from the axial deformation data at each circumferential angle, and the first depth value is recorded as h1, and the second depth value is recorded as h2;

[0077] S152: acquiring a deformation value corresponding to the first depth and a deformation value corresponding to the second depth according to the axial deformation data at the current circumferential angle, so as to calculate the cylinder bore gradient deformation data;

[0078] It can be understood that after obtaining multiple groups of cylinder bore axial deformation data, in order to more accurately analyze the deformation of the cylinder bore at different depths, it is necessary to perform a gradient analysis on the cylinder bore axial deformation data obtained in step S14. First, a starting depth is selected in the axial direction of the cylinder bore, and then a second depth is selected at intervals of a preset height. The deformation data corresponding to the starting depth and the deformation data corresponding to the second depth are respectively obtained from the cylinder bore axial deformation data, so as to calculate a group of cylinder bore gradient deformation data from the starting depth to the second depth, and then the deformation data of the third depth is obtained. The third depth differs from the second depth by a preset height, and another group of cylinder bore gradient deformation data is obtained based on the deformation data of the second depth and the third depth. This is repeated until all the depths involved in the preset path of the cylinder bore are calculated.

[0079] It should be noted that the calculation formula for the cylinder bore gradient deformation data is:

[0080]

[0081] Among them, Dg is the gradient deformation data, h2 is the second depth value in the axial deformation data at each circumferential angle, h1 is the first depth value in the axial deformation data at each circumferential angle, u1 is the deformation value corresponding to h1, and u2 is the deformation value corresponding to h2.

[0082] Furthermore, the preset height value is generally 3-5 mm, that is, the difference between h2 and h1 is in the range of 3-5 mm.

[0083] S16: acquiring a movement speed of a piston at a preset depth of a cylinder hole according to the model information of the engine to be tested, wherein the piston is a part matched with the cylinder hole;

[0084] It should be noted that, in actual use, the movement speed of the piston at various positions of the cylinder bore is different. Based on this, in this step, if the cylinder bore evaluation standards corresponding to all cylinder bore depths are unified, it is easy to increase unnecessary engine design costs. In order to reduce the design pressure of the engine cylinder block, the cylinder bore deformation evaluation index requirements will be more stringent for positions where the piston moves at a high speed, and the cylinder bore deformation evaluation index requirements may be appropriately relaxed for positions where the piston moves slower.

[0085] Understandable, see Figure 7, shown is a schematic diagram of the theoretical calculation of piston movement speed. The movement speed of the piston is determined by the design size of the crank-connecting rod mechanism and the speed of the crankshaft. For the engine, the design size of the crank-connecting rod mechanism is fixed and can be directly obtained according to the model information of the engine to be tested. The speed of the crankshaft will change according to the use of the engine. When the crankshaft speed is constant, the angular velocity is a constant value. The piston top dead center is recorded as 0 degrees of the crankshaft. The piston speed curve is distributed in a sinusoidal function. The following is the calculation formula for the piston movement speed:

[0086]

[0087] Where Vp is the piston speed, R is the crankshaft radius, ω is the crankshaft angular velocity, α is the axial angle between the crank and the cylinder bore, λ is the connecting rod ratio, L is the connecting rod length, and N is the crankshaft speed.

[0088] It is important to note that the angle α is directly determined by the preset depth, where Figure 5 The parameter x in represents the preset depth. The starting value of the preset depth is set to 0. Then the preset depth x and the angle α are:

[0089] x=R[(1-cosα)+λ / 4(1-cos2α)]

[0090] It can be understood that the angle α of any depth of the cylinder hole can be obtained according to the relationship between the preset depth x and the angle α, and then the movement speed of the piston corresponding to the cylinder hole depth can be calculated according to the angle α.

[0091] S17: Obtaining comprehensive evaluation data of the cylinder bore according to the movement speed of the piston at a preset depth of the cylinder bore and the gradient deformation data corresponding to the preset depth;

[0092] It can be understood that by comprehensively evaluating the deformation of the cylinder bore at any depth based on the movement speed and gradient deformation data, non-uniform evaluation standards can be formulated to avoid adding unnecessary design costs. At the same time, the deformation of the cylinder bore at different positions under different working conditions can be judged more comprehensively and accurately.

[0093] Furthermore, the formula for obtaining the comprehensive evaluation data of the cylinder bore is:

[0094] DV=Dg×Vp

[0095] Wherein, DV is the comprehensive evaluation data of the cylinder bore at the preset depth, Dg is the gradient deformation data corresponding to the preset depth, and Vp is the movement speed of the piston at the preset depth of the cylinder bore.

[0096] S18: selecting a standard data range corresponding to a preset depth from the cylinder bore standard index, and determining whether the cylinder bore comprehensive evaluation data at the preset depth is within the corresponding standard data range;

[0097] It should be noted that after obtaining the corresponding comprehensive evaluation data of the cylinder bore at any depth, it can be compared with the corresponding cylinder bore standard index. In this embodiment, the cylinder bore standard index includes an upper limit value and a lower limit value. Only when the detected comprehensive evaluation data of the cylinder bore is between the upper limit value and the lower limit value, can it be determined that no deformation has occurred.

[0098] Furthermore, since the phenotypic standard indicators of various positions of the cylinder bores of engine blocks of different models are different, no specific limitation is made to the cylinder bore standard indicators.

[0099] S19: If no, it is determined that the cylinder bore of the engine body to be tested is deformed;

[0100] It is understandable that as long as the comprehensive evaluation data at any depth of the cylinder bore is within the cylinder bore standard index, the final analysis result can be determined as no deformation risk. On the contrary, if the comprehensive evaluation data at a certain point of the cylinder bore does not meet the cylinder bore standard index, it is determined to be deformed, and the working conditions, preset depth and other conditions with deformation risk are recorded so that engineers can correct the position of the cylinder bore with deformation risk.

[0101] In summary, according to the above-mentioned deformation analysis method of the engine cylinder bore, by establishing an engine body solid model and performing gradient analysis on the extracted axial deformation data, a more comprehensive cylinder bore deformation result is obtained to replace the traditional detection method. Specifically, firstly, the various parts contained in the cylinder body are simulated and analyzed to establish multiple three-dimensional solid models of parts, and then all the three-dimensional solid models of parts are assembled to obtain a three-dimensional solid model of the engine body, and the axial deformation data of the cylinder bore at different depths under the assembly condition are obtained, and then the temperature of the three-dimensional solid model of the engine body is increased to simulate the high temperature thermal load scene, and the axial deformation data of the cylinder bore at different depths under the scene are obtained, and then the axial deformation data obtained under the assembly condition and the thermal load are respectively subjected to gradient analysis to obtain multiple cylinder bore deformation gradient data tables, so as to compare them according to the preset cylinder bore standard indicators, thereby obtaining a comprehensive cylinder bore deformation analysis result, which greatly improves the accuracy of the cylinder bore deformation analysis.

[0102] See also Figure 8 , shown is a deformation analysis system for an engine cylinder bore in a third embodiment of the present invention, the system comprising:

[0103] The model building module 11 is used to perform finite element simulation analysis on each part of the engine body to be tested, so as to establish a three-dimensional solid model of each part corresponding to each part in the engine body to be tested;

[0104] The first extraction module 12 is used to assemble the three-dimensional solid models corresponding to the various parts according to the preset engine installation requirements to obtain the three-dimensional solid model of the engine body, and calculate the axial deformation data of the cylinder bore under the preset path under the assembly condition according to the three-dimensional solid model of the engine body;

[0105] Furthermore, the first extraction module 12 further includes:

[0106] A manual retrieval unit, used to obtain the model information of the engine to be tested, and retrieve the preset cylinder bore standard index and assembly requirement instructions from the preset database according to the model information;

[0107] The assembly unit is used to apply a preset axial force to the three-dimensional solid model of the cylinder head bolt according to the assembly requirement description to complete the assembly of the three-dimensional solid models of various parts to obtain the three-dimensional solid model of the engine body.

[0108] A second extraction module 13 is used to add a preset temperature value to the three-dimensional solid model of the engine body to calculate the axial deformation data of the cylinder bore in a preset path under thermal load;

[0109] The deformation analysis module 14 is used to successively obtain a plurality of cylinder bore deformation gradient data tables according to the axial deformation data of the cylinder bore in a preset path under assembly conditions and under thermal load, and to compare the cylinder bore deformation gradient data tables according to preset cylinder bore standard indicators to obtain cylinder bore deformation analysis results.

[0110] Furthermore, the deformation analysis module 14 also includes:

[0111] A comparison unit, used for selecting a standard data range corresponding to a preset depth from the cylinder bore standard index, and determining whether the cylinder bore comprehensive evaluation data at the preset depth is within the corresponding standard data range;

[0112] The deformation determination unit is used to determine whether the cylinder bore of the engine body to be tested is deformed.

[0113] Furthermore, in some optional embodiments of the present invention, the system further includes:

[0114] A first detection module is used to select a reference circumferential angle on the end surface of the cylinder hole, the reference circumferential angle is 0°, and extract axial deformation data of the cylinder hole at every preset angle to obtain axial deformation data of multiple circumferential angles;

[0115] The gradient analysis module is used to perform gradient analysis on the axial deformation data at each circumferential angle to obtain the gradient deformation data of the cylinder bore at different depths.

[0116] Furthermore, the gradient analysis module also includes:

[0117] A position setting unit, used for selecting a first depth and a second depth from the axial deformation data at each circumferential angle, wherein the first depth value is recorded as h1 and the second depth value is recorded as h2;

[0118] The gradient data acquisition unit is used to respectively acquire the deformation value corresponding to the first depth and the deformation value corresponding to the second depth according to the axial deformation data at the current circumferential angle, so as to calculate the cylinder bore gradient deformation data.

[0119] Furthermore, in some optional embodiments of the present invention, the system further includes:

[0120] A speed calculation module, used to obtain the movement speed of the piston at a preset depth of the cylinder hole according to the model information of the engine to be tested, wherein the piston is a part matched with the cylinder hole;

[0121] The comprehensive evaluation module is used to obtain comprehensive evaluation data of the cylinder bore according to the movement speed of the piston at a preset depth of the cylinder bore and the gradient deformation data corresponding to the preset depth.

[0122] In summary, according to the above-mentioned deformation analysis system of the engine cylinder bore, by establishing an engine body solid model and performing gradient analysis on the extracted axial deformation data, a more comprehensive cylinder bore deformation result is obtained to replace the traditional detection method. Specifically, firstly, the various parts contained in the cylinder body are simulated and analyzed to establish multiple three-dimensional solid models of parts, and then all the three-dimensional solid models of parts are assembled to obtain a three-dimensional solid model of the engine body, and the axial deformation data of the cylinder bore at different depths under the assembly condition are obtained, and then the temperature of the three-dimensional solid model of the engine body is increased to simulate the high temperature thermal load scene, and the axial deformation data of the cylinder bore at different depths under the scene are obtained, and then the axial deformation data obtained under the assembly condition and the thermal load are respectively gradient analyzed to obtain multiple cylinder bore deformation gradient data tables, so as to compare them according to the preset cylinder bore standard indicators, so as to obtain comprehensive cylinder bore deformation analysis results, which greatly improves the accuracy of cylinder bore deformation analysis.

[0123] Another aspect of the present invention further provides a storage medium on which one or more programs are stored, and when the programs are executed by a processor, the above-mentioned deformation analysis method of the engine cylinder bore is implemented.

[0124] Another aspect of the present invention further provides a detection device, including a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory to implement the above-mentioned engine cylinder bore deformation analysis method.

[0125] Those skilled in the art will appreciate that the logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For purposes of this specification, "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0126] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0127] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or a combination thereof: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0128] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0129] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A deformation analysis method for an engine cylinder bore, characterized in that: The method comprises: Conduct finite element simulation analysis on each part of the engine body to be tested, so as to establish a three-dimensional solid model of each part corresponding to each part of the engine body to be tested; Assembling the three-dimensional solid models corresponding to the various parts according to the preset engine installation requirements to obtain a three-dimensional solid model of the engine body, and calculating the axial deformation data of the cylinder bore under the preset path under the assembly condition according to the three-dimensional solid model of the engine body; Adding a preset temperature value to the three-dimensional solid model of the engine body to calculate the axial deformation data of the cylinder bore in a preset path under thermal load; A plurality of cylinder bore deformation gradient data tables are obtained in succession according to the axial deformation data of the cylinder bore in a preset path under assembly conditions and thermal loads, and the cylinder bore deformation gradient data tables are compared according to preset cylinder bore standard indicators to obtain cylinder bore deformation analysis results.

2. The deformation analysis method of the engine cylinder bore according to claim 1, characterized in that: The engine to be tested includes an engine cylinder head, a cylinder block, a cylinder gasket, a cylinder head cover, and cylinder head bolts. The steps of assembling the three-dimensional solid models corresponding to the various parts according to the preset engine installation requirements to obtain the three-dimensional solid model of the engine body include: Acquire the model information of the engine to be tested, and retrieve the preset cylinder bore standard index and assembly requirement description from a preset database according to the model information; According to the assembly requirements, a preset axial force is applied to the three-dimensional solid model of the cylinder head bolt to complete the assembly of the three-dimensional solid models of each part to obtain the three-dimensional solid model of the engine body.

3. The deformation analysis method of the engine cylinder bore according to claim 2, characterized in that: The method further comprises: A reference circumferential angle is selected on the end surface of the cylinder hole, the reference circumferential angle being 0°, and axial deformation data of the cylinder hole is extracted at every preset angle to obtain axial deformation data at multiple circumferential angles; The gradient analysis is performed on the axial deformation data at each circumferential angle to obtain the gradient deformation data of the cylinder bore at different depths.

4. The deformation analysis method of the engine cylinder bore according to claim 3, characterized in that: The step of performing gradient analysis on the axial deformation data at each circumferential angle to obtain gradient deformation data of the cylinder bore at different depths also includes: Select a first depth and a second depth from the axial deformation data at each circumferential angle, and the first depth value is recorded as h1, and the second depth value is recorded as h2; The deformation value corresponding to the first depth and the deformation value corresponding to the second depth are respectively acquired according to the axial deformation data at the current circumferential angle, so as to calculate the cylinder bore gradient deformation data.

5. The deformation analysis method of the engine cylinder bore according to claim 4, characterized in that: The calculation formula for obtaining the cylinder bore gradient deformation data is: Among them, Dg is the gradient deformation data, h2 is the second depth value in the axial deformation data at each circumferential angle, h1 is the first depth value in the axial deformation data at each circumferential angle, u1 is the deformation value corresponding to h1, and u2 is the deformation value corresponding to h2.

6. The method for analyzing the deformation of an engine cylinder bore according to claim 4, characterized in that: The method further comprises: According to the model information of the engine to be tested, the movement speed of the piston at a preset depth of the cylinder hole is obtained, wherein the piston is a part matched with the cylinder hole; The comprehensive evaluation data of the cylinder bore is obtained according to the movement speed of the piston at the preset depth of the cylinder bore and the gradient deformation data corresponding to the preset depth. The formula for obtaining the comprehensive evaluation data of the cylinder bore is: DV=Dg×Vp Wherein, DV is the comprehensive evaluation data of the cylinder bore at the preset depth, Dg is the gradient deformation data corresponding to the preset depth, and Vp is the movement speed of the piston at the preset depth of the cylinder bore.

7. The deformation analysis method of the engine cylinder bore according to claim 6, characterized in that: The step of analogizing the cylinder bore deformation gradient data table according to the preset cylinder bore standard index to obtain the cylinder bore deformation analysis result includes: Selecting a standard data range corresponding to a preset depth from the cylinder bore standard index, and determining whether the cylinder bore comprehensive evaluation data at the preset depth is within the corresponding standard data range; If not, it is determined that the cylinder bore of the engine body to be tested is deformed.

8. A deformation analysis system for an engine cylinder bore, characterized in that: The system comprises: A model building module is used to perform finite element simulation analysis on each part of the engine body to be tested, so as to establish a three-dimensional solid model of each part corresponding to each part in the engine body to be tested; A first extraction module is used to assemble the three-dimensional solid models corresponding to the various parts according to the preset engine installation requirements to obtain a three-dimensional solid model of the engine body, and calculate the axial deformation data of the cylinder bore under the preset path under the assembly condition according to the three-dimensional solid model of the engine body; a second extraction module, for adding a preset temperature value to the three-dimensional solid model of the engine body to calculate the axial deformation data of the cylinder bore in a preset path under thermal load; The deformation analysis module is used to successively obtain multiple cylinder bore deformation gradient data tables according to the axial deformation data of the cylinder bore in a preset path under assembly conditions and thermal loads, and to compare the cylinder bore deformation gradient data tables according to preset cylinder bore standard indicators to obtain cylinder bore deformation analysis results.

9. A storage medium, characterized in that: include: The storage medium stores one or more programs, which, when executed by a processor, implement the deformation analysis method for an engine cylinder bore as described in any one of claims 1 to 7.

10. A detection device, characterized in that: The detection device comprises a memory and a processor, wherein: The memory is used to store computer programs; When the processor is used to execute the computer program stored in the memory, the deformation analysis method of the engine cylinder bore described in any one of claims 1-7 is implemented.

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