Method and device for acquiring abrasion loss between air valve and valve seat in engine

Abstract

The invention provides a method for acquiring abrasion loss between an air valve and a valve seat in an engine, which can be applied to the technical field of machinery and the technical field of measurement, and comprises the following steps: acquiring structural parameters of an air distribution mechanism of the engine and environmental parameters of the air valve and the valve seat; performing dynamic calculation on the valve mechanism according to the structural parameters and the environmental parameters to obtain a first seating force and a seating speed; according to the environment parameters, the structure parameters and the seating speed, finite element calculation is conducted on the air valve and the valve seat, and impact stress and sliding stress are obtained; on the basis that the impact stress and the sliding stress meet preset conditions, finite element analysis is conducted on the scale model, and simulation parameters are obtained; on the basis of a pressure equivalent mechanism, calculating a second seating force according to the first seating force, the first stress area and a second stress area of the scaling model; redesigning the valve mechanism according to the simulation parameter and the second seating force to obtain a target valve mechanism; and the abrasion loss is calculated according to the abrasion parameters between the air valve and the valve seat.

Description

Technical Field

[0001] The present disclosure relates to the fields of mechanical technology and measurement technology, and more specifically, to a method and device for obtaining the amount of wear between a gas valve and a valve seat in an engine. Background Art

[0002] The valve and valve seat are one of the most important friction pairs in the engine. The working conditions of the valve and valve seat are relatively complex. In addition to bearing the strong impact load of the valve seat, they also need to bear the heat load brought by the corrosive high-temperature exhaust gas, which is very easy to cause wear and failure. Therefore, it is very necessary to predict the wear amount between the valve and the valve seat.

[0003] In the process of realizing the concept disclosed in the present invention, the inventors found that there are at least the following problems in the related technology: the wear amount of the engine's valves and valve seats is usually obtained through experimental measurement, but for engines with larger cylinder diameters, the structural dimensions of the valves and valve seats are also larger and the load-bearing capacity is high, and it is difficult to find a valve and valve seat wear test bench that meets the size and load impact requirements. Summary of the invention

[0004] In view of this, the present disclosure provides a method and device for obtaining the amount of wear between a gas valve and a valve seat in an engine.

[0005] One aspect of the present disclosure provides a method for obtaining the amount of wear between a valve and a valve seat in an engine, comprising: obtaining structural parameters of a valve train of the engine and environmental parameters of the valve and the valve seat, wherein the engine meets a preset valve head diameter, and the valve train is used to drive the mechanical movement of the valve; performing dynamic calculations on the valve train according to the structural parameters and the environmental parameters to obtain a first seating force and a seating speed, wherein the first seating force is a force generated when the valve hits the valve seat at the seating speed; performing finite element calculations on the valve and the valve seat according to the environmental parameters, the structural parameters and the seating speed to obtain an impact stress, a sliding stress and a first sliding distance; and performing finite element calculations on the valve and the valve seat based on the impact stress and the sliding stress to obtain a first sliding distance. The force meets the preset conditions, and the finite element analysis is performed on the scaled model to obtain the simulation parameters of the scaled model. The scaled model is obtained by proportionally reducing the mechanical mechanism of the air valve and the valve seat; based on the pressure equivalence mechanism, the second seating force of the scaled model is calculated according to the first seating force of the air valve and the valve seat, the first force area and the second force area of ​​the scaled model; the valve mechanism is redesigned according to the simulation parameters, the second seating force and the seating speed to obtain the target valve mechanism corresponding to the scaled model; the wear amount between the air valve and the valve seat is calculated according to the wear parameters between the air valve and the valve seat, and the wear parameters are obtained by performing a wear test on the scaled model using the target valve mechanism.

[0006] Another aspect of the present disclosure provides a device for acquiring the amount of wear between a valve and a valve seat in an engine, comprising: an acquisition module, for acquiring structural parameters of a valve train of the engine, environmental parameters of the valve and the valve seat, the engine meets a preset size of the valve head diameter, and the valve train is used to drive the mechanical movement of the valve and the valve seat; a first calculation module, for performing dynamic calculations on the valve train according to the structural parameters and the environmental parameters, and obtaining a first seating force and a seating speed, the first seating force being the force generated when the valve hits the valve seat at the seating speed; a second calculation module, for performing finite element calculations on the valve and the valve seat according to the environmental parameters, the structural parameters and the seating speed, and obtaining impact stress, sliding stress and a first sliding distance; a finite element analysis module, for performing finite element calculations on the valve and the valve seat based on the impact stress, the sliding stress and the first sliding distance; The stress and sliding stress meet the preset conditions, and the finite element analysis is performed on the scaled model to obtain the simulation parameters of the scaled model. The scaled model is obtained by proportionally reducing the mechanical structure of the air valve and the valve seat; the third calculation module is used to calculate the second seating force of the scaled model based on the pressure equivalence mechanism according to the first seating force of the air valve and the valve seat, the first force area and the second force area of ​​the scaled model; the redesign module is used to redesign the valve mechanism according to the simulation parameters, the second seating force and the seating speed to obtain the target valve mechanism corresponding to the scaled model; the fourth calculation module is used to calculate the wear amount between the air valve and the valve seat according to the wear parameters between the air valve and the valve seat, and the wear parameters are obtained by performing a wear test on the scaled model using the target valve mechanism.

[0007] Another aspect of the present disclosure provides an electronic device, comprising:

[0008] one or more processors;

[0009] a memory for storing one or more programs,

[0010] When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described above.

[0011] Another aspect of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, which are used to implement the above method when executed.

[0012] Another aspect of the present disclosure provides a computer program product, which includes computer executable instructions, and when the instructions are executed, are used to implement the method as described above.

[0013] According to the embodiments of the present disclosure, by performing finite element analysis on the air valve and the valve seat, the impact stress and the sliding stress are obtained; the mechanical mechanism of the air valve and the valve seat is proportionally reduced to obtain a scaled model. The scaled model is subjected to finite element analysis to obtain the simulation parameters of the scaled model. Based on the pressure equivalent mechanism, the second seating force of the scaled model is calculated according to the first seating force of the air valve and the valve seat, the first force area and the second force area of ​​the scaled model. The valve mechanism is redesigned according to the simulation parameters, the second seating force and the seating speed to obtain the target valve mechanism corresponding to the scaled model. The scaled model is subjected to a wear test using the target valve mechanism to obtain the wear parameters. The amount of wear between the air valve and the valve seat can be calculated based on the wear parameters between the air valve and the valve seat. Therefore, it is not necessary to find a valve and valve seat wear test bench that meets the size and load impact requirements, and the amount of wear between the air valve and the valve seat in the engine can also be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0015] Figure 1 The mechanical movement diagram of the gas valve and the valve seat according to the embodiment of the present disclosure is schematically shown;

[0016] Figure 2 A flow chart schematically shows a method for obtaining the amount of wear between a gas valve and a valve seat in an engine according to an embodiment of the present disclosure;

[0017] Figure 3 A flow chart schematically shows a method for obtaining the amount of wear between a valve and a valve seat in an engine according to another embodiment of the present disclosure;

[0018] Figure 4 A block diagram schematically shows a device for acquiring the amount of wear between a valve and a valve seat in an engine according to an embodiment of the present disclosure; and

[0019] Figure 5 A block diagram of an electronic device suitable for implementing a method for acquiring the amount of wear between a valve and a valve seat in an engine according to an embodiment of the present disclosure is schematically shown. DETAILED DESCRIPTION

[0020] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present disclosure. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present disclosure. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present disclosure.

[0021] The terms used herein are only for describing specific embodiments and are not intended to limit the present disclosure. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0022] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0023] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0024] In the embodiments of the present disclosure, the collection, updating, analysis, processing, use, transmission, provision, disclosure, storage, etc. of the data involved (for example, including but not limited to user personal information) are in compliance with the provisions of relevant laws and regulations, are used for legitimate purposes, and do not violate public order and good morals. In particular, necessary measures are taken for user personal information to prevent illegal access to user personal information data and maintain the security of user personal information, network security, and national security.

[0025] In the embodiments of the present disclosure, the user's authorization or consent is obtained before obtaining or collecting the user's personal information.

[0026] There are two main wear mechanisms between the valve and the valve seat. At the moment the valve is seated and closed, the valve has a certain seating speed and hits the valve seat, causing impact wear; the explosive pressure generated by the combustion in the cylinder causes the valve head to deform elastically, which in turn causes sliding wear between the valve and the valve seat.

[0027] The wear of the engine's valves and valve seats is usually measured through tests. However, for engines with larger cylinder diameters, the valves and valve seats have larger structural dimensions and higher load-bearing capacity, and it is difficult to find a valve and valve seat wear test bench that meets the size and load impact requirements.

[0028] An embodiment of the present disclosure provides a method for obtaining the amount of wear between a valve and a valve seat in an engine, comprising: obtaining structural parameters of a valve train of the engine, environmental parameters of the valve and the valve seat, the engine meets a preset size of a valve head diameter, and the valve train is used to drive the mechanical movement of the valve; performing dynamic calculations on the valve train according to the structural parameters and the environmental parameters to obtain a first seating force and a seating speed, the first seating force being the force generated when the valve hits the valve seat at the seating speed; performing finite element calculations on the valve and the valve seat according to the environmental parameters, the structural parameters and the seating speed to obtain impact stress, sliding stress and a first sliding distance; based on the impact stress and sliding stress, the first seating force is calculated. When the preset conditions are met, a finite element analysis is performed on the scaled model to obtain the simulation parameters of the scaled model. The scaled model is obtained by proportionally reducing the mechanical structure of the air valve and the valve seat. Based on the pressure equivalence mechanism, the second seating force of the scaled model is calculated according to the first seating force of the air valve and the valve seat, the first force area, and the second force area of ​​the scaled model. The valve mechanism is redesigned according to the simulation parameters, the second seating force and the seating speed to obtain the target valve mechanism corresponding to the scaled model. The wear amount between the air valve and the valve seat is calculated according to the wear parameters between the air valve and the valve seat. The wear parameters are obtained by performing a wear test on the scaled model using the target valve mechanism.

[0029] Figure 1 The figure schematically shows the mechanical movement diagram of the gas valve and the valve seat according to the embodiment of the present disclosure.

[0030] It should be noted that Figure 1 What is shown is merely an example of a system architecture to which the embodiments of the present disclosure can be applied, in order to help those skilled in the art understand the technical content of the present disclosure, but it does not mean that the embodiments of the present disclosure cannot be used in other devices, systems, environments or scenarios.

[0031] like Figure 1 As shown, the valve mechanism 130 is used to drive the mechanical movement of the gas valve 120, that is, the valve mechanism 130 drives the gas valve 120 to impact the valve seat 110 at a seating speed.

[0032] The valve mechanism 130 can be of various structural forms, for example, a valve mechanism in which a cam directly drives a rocker arm, a valve mechanism in which a cam-push rod-rocker arm is connected, etc., which is not limited here.

[0033] For example, the valve mechanism 130 is composed of a spring 131, a valve bridge 132, a rocker arm 133, a push rod 134, a follower arm 135 and a cam 136. The active part of the valve mechanism can be a cam 136, which rotates until the protruding part contacts the follower arm 135, and in turn drives the follower arm 135 in the valve mechanism 130 to rotate, the push rod 134 to rise, and the rocker arm 133 to rotate around its center point, so that the height of the end close to the valve seat 110 is reduced, thereby driving the valve bridge 132 to compress the spring 131, and the valve 120 is opened. When the cam 136 rotates to the maximum protrusion and contacts the follower arm 135, the valve reaches the maximum opening, and then the protrusion on the contact surface of the cam 136 and the follower arm 135 begins to gradually decrease, and the valve 120 begins to rise under the action of the compression spring 131 until the valve 120 hits the valve seat 110 at the seating speed.

[0034] Figure 2 A flow chart schematically shows a method for obtaining the amount of wear between a valve and a valve seat in an engine according to an embodiment of the present disclosure.

[0035] like Figure 2 As shown, the method includes operations S210 to S270.

[0036] In operation S210, structural parameters of a valve train of an engine and environmental parameters of a valve and a valve seat are acquired.

[0037] According to an embodiment of the present disclosure, the engine meets the preset size of the valve head diameter. Usually, the valve head diameter of the engine is greater than 56 mm, and it is difficult to find a suitable wear test bench for the valve and valve seat under this size. For example, the valve head diameter that meets the preset size can be greater than 56 mm. The preset size valve head diameter can be set according to actual conditions and is not limited to 56 mm.

[0038] According to an embodiment of the present disclosure, the valve mechanism is used to drive the mechanical movement of the gas valve. For example, the valve mechanism can drive the gas valve to impact the valve seat.

[0039] According to an embodiment of the present disclosure, the structural parameters of the valve train may include the structural dimensions, material density, etc. of each component.

[0040] According to an embodiment of the present disclosure, the environmental parameters of the gas valve and the valve seat include the temperature field in the working state and the in-cylinder pressure curve, etc.

[0041] In operation S220, dynamics calculation is performed on the valve train according to the structural parameters and the environmental parameters to obtain a first seating force and a seating speed.

[0042] According to an embodiment of the present disclosure, the first seating force is a force generated when the gas valve hits the valve seat at a seating speed.

[0043] In operation S230, finite element calculation is performed on the gas valve and the valve seat according to the environmental parameters, the structural parameters, and the seating speed to obtain the impact stress, the sliding stress, and the first sliding distance.

[0044] According to the embodiments of the present disclosure, finite element calculation, finite element analysis, etc. can be performed in simulation software.

[0045] According to an embodiment of the present disclosure, both the impact stress and the sliding stress are calculated under the condition of thermal-mechanical coupling, that is, the temperature in the environmental parameters is the same as the temperature when the engine is operating normally.

[0046] In operation S240 , based on the impact stress and the sliding stress satisfying preset conditions, a finite element analysis is performed on the scaled model to obtain simulation parameters of the scaled model.

[0047] According to an embodiment of the present disclosure, the scaled model is obtained by scaling down the mechanical mechanism of the gas valve and the valve seat in equal proportion. For example, the scale factor is first determined, and then the mechanical mechanism of the gas valve and the valve seat is scaled down in equal proportion to obtain the scaled model.

[0048] According to an embodiment of the present disclosure, the preset condition may be that the impact stress and the sliding stress remain unchanged. For example, when the impact stress and the sliding stress remain unchanged, the finite element analysis is performed on the scaled model, and the state information of each component in the scaled model can be obtained by reverse deduction, for example, Figure 1 Valve sliding distance, spring preload, cylinder pressure, etc.

[0049] According to an embodiment of the present disclosure, the simulation parameters may include status information of each component in the scaled model, status information of each component of the valve train, and the like.

[0050] In operation S250, based on a pressure equivalent mechanism, a second seating force of the scaled model is calculated according to the first seating force of the gas valve and the valve seat, the first force bearing area, and the second force bearing area of ​​the scaled model.

[0051] According to an embodiment of the present disclosure, pressure is the ratio of the seating force to the force-bearing area. The pressure equivalent mechanism indicates that under the condition of constant pressure, the second seating force of the scaled model can be calculated according to the second force-bearing area of ​​the scaled model.

[0052] In operation S260, the valve mechanism is redesigned according to the simulation parameters, the second seating force, and the seating speed to obtain a target valve mechanism corresponding to the scaled model.

[0053] According to the embodiments of the present disclosure, dynamics calculations can be performed on the valve mechanism based on the simulation parameters and the second seating force, and structural parameters of each component in the valve mechanism can be obtained by reverse deduction, so as to redesign the valve mechanism.

[0054] In operation S270, the amount of wear between the gas valve and the valve seat is calculated based on the wear parameters between the gas valve and the valve seat.

[0055] According to an embodiment of the present disclosure, the wear parameters are obtained by performing a wear test on a scaled model using a target valve train. For example, the scaled model can be used to measure the wear amount using a wear test bench for valves and valve seats.

[0056] According to an embodiment of the present disclosure, the method for obtaining the amount of wear between the air valve and the valve seat in the engine can be executed by a server.

[0057] According to the embodiments of the present disclosure, by performing finite element analysis on the air valve and the valve seat, the impact force and the sliding stress are obtained; the mechanical mechanism of the air valve and the valve seat is proportionally reduced to obtain a scaled model. The scaled model is subjected to finite element analysis to obtain the simulation parameters of the scaled model. Based on the pressure equivalence mechanism, the second seating force of the scaled model is calculated according to the first seating force of the air valve and the valve seat, the first force area and the second force area of ​​the scaled model. The valve mechanism is redesigned according to the simulation parameters, the second seating force and the seating speed to obtain the target valve mechanism corresponding to the scaled model. The scaled model is subjected to a wear test using the target valve mechanism to obtain the wear parameters. The amount of wear between the air valve and the valve seat can be calculated based on the wear parameters between the air valve and the valve seat. Therefore, it is not necessary to find a valve-seat wear test bench that meets the size and load impact requirements, and the amount of wear between the air valve and the valve seat in the engine can also be obtained.

[0058] According to an embodiment of the present disclosure, the structural parameters include the structural size, material and mass of the valve mechanism, and the environmental parameters include the temperature of the valve and the valve seat in the working state and the first cylinder pressure.

[0059] According to an embodiment of the present disclosure, the structural dimensions may include the dimensions of various components in the valve mechanism, for example, the base circle radius of the cam in the valve mechanism, the rocker arm ratio, the valve clearance, etc.

[0060] According to an embodiment of the present disclosure, the material may include material density, elasticity, etc.

[0061] According to an embodiment of the present disclosure, finite element calculation is performed on the air valve and the valve seat according to environmental parameters, structural parameters and seating speed, and the impact stress, sliding stress and the first sliding distance are obtained, including: according to temperature, seating speed, first cylinder pressure and first spring preload, finite element calculation is performed on the air valve and the valve seat to obtain impact stress, sliding stress and the first sliding distance, the boundary conditions of the impact stress include temperature, gravity acceleration, first spring preload and seating speed, the boundary conditions of the sliding stress and the first sliding distance include temperature, gravity acceleration, first cylinder pressure and first spring preload, and the first spring preload is the preload of the first spring in the valve mechanism.

[0062] According to an embodiment of the present disclosure, the preset condition is that the impact stress and the sliding stress remain unchanged and the boundary conditions of the impact stress and part of the boundary conditions of the sliding stress also remain unchanged.

[0063] According to an embodiment of the present disclosure, the simulation parameters include a second spring preload corresponding to the impact stress, a second cylinder pressure corresponding to the sliding stress, and a second sliding distance.

[0064] According to an embodiment of the present disclosure, the first slip distance may be a slip distance of a large-bore engine valve corresponding to the amount of sliding wear. The second slip distance may be a slip distance of a scaled-down model corresponding to the amount of sliding wear.

[0065] According to an embodiment of the present disclosure, the same temperature field and seating speed. The impact stress and sliding stress remain unchanged, and the boundary conditions of the impact stress and some boundary conditions of the sliding stress also remain unchanged. First, the impact stress of the scaled model is calculated under thermal-mechanical coupling. The boundary conditions of the impact stress include the temperature, gravitational acceleration, the first spring preload and the seating speed remain unchanged. According to the result of the maximum impact stress, which should be the same as the impact stress, the value of the second spring preload of the scaled model is inversely calculated. Then, the sliding stress of the scaled model is calculated under thermal-mechanical coupling, and the boundary conditions are temperature, gravitational acceleration, the first cylinder pressure and the second spring preload. According to the result of the maximum sliding stress, which is the same as the sliding stress, the value of the second cylinder pressure of the scaled model is inversely calculated, and the second slip distance of the scaled model is obtained.

[0066] According to an embodiment of the present disclosure, the valve mechanism is redesigned according to the simulation parameters, the second seating force and the seating speed to obtain a target valve mechanism corresponding to the scaled model, including: while the second spring preload, the second seating force and the seating speed remain unchanged, the valve mechanism is redesigned to obtain a target valve mechanism corresponding to the scaled model.

[0067] like Figure 1 As shown, the exemplary valve mechanism 130 is redesigned, and the cam profile, spring stiffness, etc. can be adjusted while the second spring preload, the second seating force, and the seating speed remain unchanged, so as to obtain a target valve mechanism corresponding to the scaled model. The structure of the target valve mechanism may be different from that of the valve mechanism of the large-bore engine, which is not limited here.

[0068] According to an embodiment of the present disclosure, the target valve mechanism drives the air valve in the scaled model to hit the valve seat in the scaled model at a seating speed to form a second seating force, and the value of the preload force of the second spring in the scaled model is the second spring preload force.

[0069] According to an embodiment of the present disclosure, the formula of the pressure equivalent mechanism is as follows:

[0070] F1 / A1=F2 / A2 (1)

[0071] F1 is the first seating force, A1 is the first contact area between the air valve and the valve seat, F2 is the second seating force, A2 is the second contact area between the scaled air valve and the scaled valve seat in the scaled model.

[0072] According to an embodiment of the present disclosure, the wear parameters include an impact wear coefficient, an impact wear constant and a sliding wear coefficient; calculating the wear amount between the air valve and the valve seat based on the wear parameters between the air valve and the valve seat includes: calculating the impact wear amount between the air valve and the valve seat based on the impact wear coefficient and the impact wear constant between the air valve and the valve seat, the impact wear coefficient and the impact wear constant being obtained by performing an impact wear test on a scaled model using a target valve mechanism; calculating the sliding wear amount between the air valve and the valve seat based on the sliding wear coefficient between the air valve and the valve seat, the sliding wear coefficient being obtained by performing a sliding wear test on a scaled model using a target valve mechanism; determining the wear amount between the air valve and the valve seat based on the impact wear amount and the sliding wear amount.

[0073] According to the embodiments of the present disclosure, impact wear tests are performed using a target valve train and a scaled model. The test uses a temperature field consistent with that of a large-bore engine in normal operation, and after the test, the wear of the valve and valve seat in the scaled model is measured. At least three repeatability tests are required to ensure that the wear data is stable and reproducible.

[0074] According to an embodiment of the present disclosure, the formula for the impact wear amount is as follows:

[0075]

[0076] (2)

[0077]

[0078] W C is the impact wear, w c is the impact wear mass, K is the wear coefficient, N is the number of cycles, m is determined according to the mass of the valve in the valve mechanism, the mass of the valve follower in the valve mechanism and the mass of the first spring, v is the seating speed, n is the wear constant, and ρ is the material density of the mechanical mechanism of the valve and the valve seat.

[0079] For example, m is the sum of the valve mass, the follower mass, and half the spring mass.

[0080] For example, the follower may be a spring lock clip, a spring upper seat, etc. in the valve mechanism. The follower may be determined according to the actual conditions of the actual valve mechanism, the gas valve, and the valve seat.

[0081] Compare the predicted impact wear amount of the scaled model calculated by the impact wear formula with the actual impact wear amount obtained by the impact wear test, and carefully analyze the reasons for the impact wear amount error. If the impact wear amount error does not meet the requirements, correct the wear coefficient K and wear constant n of the wear formula until they are within the error range. Thus, the corrected impact wear formula is obtained. The corrected impact wear formula is used to calculate the impact wear amount between the gas valve and the valve seat according to the mass of each component of the gas valve and the valve seat.

[0082] According to the embodiment of the present disclosure, a sliding wear test is performed using a scaled model. The test uses a second spring preload, a second cylinder pressure, and a temperature field consistent with the normal operation of a large-bore engine to perform the sliding wear test. After the test, the sliding wear amount between the air valve and the valve seat in the scaled model is measured. At least three repeatability tests are required to ensure that the sliding wear amount data is stable and reproducible.

[0083] According to an embodiment of the present disclosure, the formula for sliding wear amount is as follows:

[0084] (3)

[0085] W H is the sliding wear amount, λ is the wear coefficient, P is the normal load, L is the sliding distance, and H is the material hardness of the mechanical structure. The sliding distance is obtained by sliding stress finite element calculation. The first sliding distance is used to calculate the wear amount of the large-cylinder engine, and the second sliding distance is used to calculate the wear amount of the scaled model.

[0086] The predicted sliding wear amount of the scaled model is calculated using the sliding wear formula and compared with the actual sliding wear amount obtained from the sliding wear test. The cause of the sliding wear error is carefully analyzed. If the sliding wear error does not meet the requirements, the wear coefficient λ of the wear formula is corrected until it is within the error range. Thus, the corrected sliding wear formula is obtained. The corrected sliding wear formula is used to calculate the sliding wear amount between the valve and the valve seat according to the material hardness of the valve and the valve seat.

[0087] (4)

[0088] Wear amount W Z It is equal to the sum of the impact wear and the sliding wear. The total wear calculation formula can be obtained according to the revised formula.

[0089] Figure 3 A flow chart of a method for obtaining the amount of wear between a valve and a valve seat in an engine according to another embodiment of the present disclosure is schematically shown.

[0090] like Figure 3 As shown, the method includes operations S301 to S314.

[0091] In operation S301 , structural parameters of a valve train of an engine and environmental parameters of a valve and a valve seat are acquired.

[0092] In operation S302, the valve train dynamics is calculated to obtain a first seating force and a seating speed.

[0093] In operation S303, a finite element calculation of thermal-mechanical coupling is performed on the gas valve and the valve seat to obtain impact stress, sliding stress, and a first sliding distance.

[0094] In operation S304, the model reduction coefficient is determined, and the mechanical structure of the gas valve and the valve seat is reduced in proportion to obtain a reduced model.

[0095] In operation S305 , a finite element analysis is performed on the scaled model to obtain a second spring preload force, a second cylinder pressure, and a second slip distance corresponding to the scaled model.

[0096] In operation S306 , the temperature is ensured to be consistent with that of the large-bore engine, and a sliding wear test is performed on the scaled-down model with a second spring preload and a second cylinder pressure.

[0097] In operation S307 , the actual sliding wear amount of the scaled model is compared and analyzed with the sliding wear amount calculated by formula (3).

[0098] In operation S308, it is determined whether the error of the sliding wear amount meets the requirement. If so, operation S316 is performed; if not, operation S309 is performed.

[0099] In operation S309, the sliding wear coefficient is adjusted.

[0100] In operation S310, a second seating force corresponding to the scaled model is calculated using formula (1).

[0101] In operation S311, the valve mechanism is redesigned with the second spring preload, the seating speed, and the second seating force unchanged.

[0102] In operation S312, the temperature is ensured to be consistent with that of a large-bore engine, and an impact wear test is performed on the scaled model.

[0103] In operation S313, the actual impact wear amount of the scaled model is compared and analyzed with the impact wear amount calculated by formula (2).

[0104] In operation S314 , it is determined whether the error of the impact wear amount meets the requirement. If so, operation S316 is performed; if not, operation S315 is performed.

[0105] In operation S315, the impact wear coefficient and the impact wear constant are adjusted.

[0106] In operation S316, the wear amount between the valve and the valve seat in the engine is calculated according to formula (4).

[0107] By combining the wear formula with the scaled model wear test, an efficient and accurate formula for predicting the wear of the valve and valve seat of a large-bore engine was obtained. This method overcomes the large error caused by the lack of precision of the traditional formula, and also solves the problem of the difficulty in finding a large-size, high-load valve and valve seat wear test bench. While reducing the cost of model testing and environmental requirements, it improves the calculation accuracy of the wear formula, thereby achieving accurate prediction of the wear between the valve and the valve seat in a large-bore engine.

[0108] Figure 4 A block diagram of a device for acquiring the amount of wear between a valve and a valve seat in an engine according to an embodiment of the present disclosure is schematically shown.

[0109] like Figure 4 As shown, the device 400 for acquiring the wear amount between the gas valve and the valve seat in the engine includes an acquisition module 410, a first calculation module 420, a second calculation module 430, a finite element analysis module 440, a third calculation module 450, a redesign module 460 and a fourth calculation module 470.

[0110] The acquisition module 410 is used to acquire the structural parameters of the engine's valve train, and the environmental parameters of the valve and valve seat. The engine meets the preset size of the valve head diameter, and the valve train is used to drive the mechanical movement of the valve.

[0111] The first calculation module 420 is used to perform dynamic calculation on the valve mechanism according to the structural parameters and the environmental parameters to obtain a first seating force and a seating speed. The first seating force is the force generated when the gas valve hits the valve seat at the seating speed.

[0112] The second calculation module 430 is used to perform finite element calculation on the gas valve and the valve seat according to the environmental parameters, structural parameters and seating speed to obtain the impact stress, sliding stress and the first sliding distance.

[0113] The finite element analysis module 440 is used to perform finite element analysis on the scaled model based on the impact stress and sliding stress satisfying preset conditions to obtain simulation parameters of the scaled model. The scaled model is obtained by proportionally reducing the mechanical structure of the gas valve and the valve seat.

[0114] The third calculation module 450 is used to calculate the second seating force of the scaled model based on the pressure equivalent mechanism according to the first seating force of the gas valve and the valve seat, the first force-bearing area and the second force-bearing area of ​​the scaled model.

[0115] The redesign module 460 is used to redesign the valve mechanism according to the simulation parameters, the second seating force and the seating speed to obtain a target valve mechanism corresponding to the scaled model.

[0116] The fourth calculation module 470 is used to calculate the amount of wear between the gas valve and the valve seat according to the wear parameters between the gas valve and the valve seat, wherein the wear parameters are obtained by performing a wear test on a scaled model using a target valve train.

[0117] According to an embodiment of the present disclosure, the wear parameters are obtained by performing a wear test on a scaled model using a target valve train.

[0118] According to an embodiment of the present disclosure, the structural parameters include the structural size, material and mass of the valve mechanism, and the environmental parameters include the temperature of the valve and the valve seat in the working state and the first cylinder pressure.

[0119] According to an embodiment of the present disclosure, the second calculation module 430 includes a first finite element calculation submodule. The first finite element calculation submodule is used to perform finite element calculation on the valve and the valve seat according to the temperature, the seating speed, the first cylinder pressure and the first spring preload, and obtain the impact stress, the sliding stress and the first sliding distance. The boundary conditions of the impact stress include the temperature, the gravity acceleration, the first spring preload and the seating speed. The boundary conditions of the sliding stress and the first sliding distance include the temperature, the gravity acceleration, the first cylinder pressure and the first spring preload. The first spring preload is the preload of the first spring in the valve train.

[0120] According to an embodiment of the present disclosure, the preset condition is that the impact stress and the sliding stress remain unchanged and the boundary conditions of the impact stress and some boundary conditions of the sliding stress also remain unchanged, and the simulation parameters include a second spring preload corresponding to the impact stress, a second cylinder pressure corresponding to the sliding stress, and a second sliding distance.

[0121] According to an embodiment of the present disclosure, the redesign module 460 includes a redesign submodule for redesigning the valve train to obtain a target valve train corresponding to the scaled model while keeping the second spring preload, the second seating force and the seating speed unchanged.

[0122] According to an embodiment of the present disclosure, the wear parameters include an impact wear coefficient, an impact wear constant and a sliding wear coefficient; the fourth calculation module includes a first calculation submodule, a second calculation submodule and a determination module. The first calculation submodule is used to calculate the impact wear amount between the gas valve and the valve seat according to the impact wear coefficient and the impact wear constant between the gas valve and the valve seat, and the impact wear coefficient and the impact wear constant are obtained by performing an impact wear test on a scaled model using a target valve distribution structure. The second calculation submodule is used to calculate the sliding wear amount between the gas valve and the valve seat according to the sliding wear coefficient between the gas valve and the valve seat, and the sliding wear coefficient is obtained by performing a sliding wear test on a scaled model using a target valve distribution structure. The determination module is used to determine the wear amount between the gas valve and the valve seat according to the impact wear amount and the sliding wear amount.

[0123] According to an embodiment of the present disclosure, the formula for the impact wear amount is shown in formula (2).

[0124] According to an embodiment of the present disclosure, the formula for the sliding wear amount is shown in formula (3).

[0125] According to an embodiment of the present disclosure, the formula of the pressure equivalent mechanism is shown in formula (1).

[0126] According to the embodiments of the present invention, any one or more of the modules, submodules, units, and subunits, or at least part of the functions of any one of them can be implemented in one module. According to the embodiments of the present invention, any one or more of the modules, submodules, units, and subunits can be split into multiple modules for implementation. According to the embodiments of the present invention, any one or more of the modules, submodules, units, and subunits can be at least partially implemented as hardware circuits, such as field programmable gate arrays (FPGAs), programmable logic arrays (PLAs), systems on chips, systems on substrates, systems on packages, application specific integrated circuits (ASICs), or can be implemented by hardware or firmware in any other reasonable way of integrating or packaging circuits, or can be implemented in any one of the three implementation methods of software, hardware, and firmware, or in any appropriate combination of any of them. Alternatively, according to the embodiments of the present invention, one or more of the modules, submodules, units, and subunits can be at least partially implemented as computer program modules, and when the computer program modules are run, the corresponding functions can be performed.

[0127] For example, any multiple of the fetch module 410, the first calculation module 420, the second calculation module 430, the finite element analysis module 440, the third calculation module 450, the redesign module 460, and the fourth calculation module 470 can be combined in one module / unit / subunit for implementation, or any one of the modules / units / subunits can be split into multiple modules / units / subunits. Alternatively, at least part of the functions of one or more of these modules / units / subunits can be combined with at least part of the functions of other modules / units / subunits and implemented in one module / unit / subunit. According to an embodiment of the present disclosure, at least one of the fetch module 410, the first calculation module 420, the second calculation module 430, the finite element analysis module 440, the third calculation module 450, the redesign module 460, and the fourth calculation module 470 may be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), a system on a chip, a system on a substrate, a system on a package, an application specific integrated circuit (ASIC), or may be implemented by hardware or firmware such as any other reasonable way of integrating or packaging the circuit, or implemented in any one of the three implementation modes of software, hardware, and firmware, or in any appropriate combination of any of them. Alternatively, at least one of the fetch module 410, the first calculation module 420, the second calculation module 430, the finite element analysis module 440, the third calculation module 450, the redesign module 460, and the fourth calculation module 470 may be at least partially implemented as a computer program module, and when the computer program module is run, the corresponding function may be executed.

[0128] It should be noted that the part of the device for obtaining the amount of wear between the air valve and the valve seat in the engine in the embodiment of the present disclosure corresponds to the part of the method for obtaining the amount of wear between the air valve and the valve seat in the engine in the embodiment of the present disclosure. The description of the part of the device for obtaining the amount of wear between the air valve and the valve seat in the engine specifically refers to the part of the method for obtaining the amount of wear between the air valve and the valve seat in the engine, which will not be repeated here.

[0129] Figure 5 A block diagram of an electronic device suitable for implementing a method for acquiring the amount of wear between a valve and a valve seat in an engine according to an embodiment of the present disclosure is schematically shown.

[0130] Figure 5 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0131] like Figure 5As shown, the electronic device 500 according to an embodiment of the present disclosure includes a processor 501, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 502 or a program loaded from a storage part 508 to a random access memory (RAM) 503. The processor 501 may include, for example, a general-purpose microprocessor (such as a CPU), an instruction set processor and / or a related chipset and / or a special-purpose microprocessor (for example, an application-specific integrated circuit (ASIC)), etc. The processor 501 may also include an onboard memory for caching purposes. The processor 501 may include a single processing unit or multiple processing units for performing different actions of the method flow according to an embodiment of the present disclosure.

[0132] In RAM 503, various programs and data required for the operation of electronic device 500 are stored. Processor 501, ROM 502 and RAM 503 are connected to each other via bus 504. Processor 501 performs various operations of the method flow according to the embodiment of the present disclosure by executing the program in ROM 502 and / or RAM 503. It should be noted that the program can also be stored in one or more memories other than ROM 502 and RAM 503. Processor 501 can also perform various operations of the method flow according to the embodiment of the present disclosure by executing the program stored in the one or more memories.

[0133] According to an embodiment of the present disclosure, the electronic device 500 may further include an input / output (I / O) interface 505, which is also connected to the bus 504. The electronic device 500 may further include one or more of the following components connected to the input / output (I / O) interface 505: an input portion 506 including a keyboard, a mouse, etc.; an output portion 507 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage portion 508 including a hard disk, etc.; and a communication portion 509 including a network interface card such as a LAN card, a modem, etc. The communication portion 509 performs communication processing via a network such as the Internet. A drive 510 is also connected to the input / output (I / O) interface 505 as needed. A removable medium 511, such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 510 as needed, so that a computer program read therefrom is installed into the storage portion 508 as needed.

[0134] According to an embodiment of the present disclosure, the method flow according to an embodiment of the present disclosure can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a computer-readable storage medium, and the computer program contains a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 509, and / or installed from the removable medium 511. When the computer program is executed by the processor 501, the above-mentioned functions defined in the system of the embodiment of the present disclosure are executed. According to an embodiment of the present disclosure, the system, equipment, device, module, unit, etc. described above can be implemented by a computer program module.

[0135] The present disclosure also provides a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments; or may exist independently without being assembled into the device / apparatus / system. The above computer-readable storage medium carries one or more programs, and when the above one or more programs are executed, the method according to the embodiment of the present disclosure is implemented.

[0136] According to an embodiment of the present disclosure, the computer-readable storage medium may be a non-volatile computer-readable storage medium. For example, it may include, but is not limited to: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, apparatus, or device.

[0137] For example, according to an embodiment of the present disclosure, the computer-readable storage medium may include the ROM 502 and / or the RAM 503 described above and / or one or more memories other than the ROM 502 and the RAM 503 .

[0138] An embodiment of the present disclosure also includes a computer program product, which includes a computer program, and the computer program contains a program code for executing the method provided by the embodiment of the present disclosure. When the computer program product runs on an electronic device, the program code is used to enable the electronic device to implement the method for obtaining the amount of wear between the air valve and the valve seat in the engine provided by the embodiment of the present disclosure.

[0139] When the computer program is executed by the processor 501, the above functions defined in the system / device of the embodiment of the present disclosure are executed. According to the embodiment of the present disclosure, the system, device, module, unit, etc. described above can be implemented by a computer program module.

[0140] In one embodiment, the computer program may rely on tangible storage media such as optical storage devices, magnetic storage devices, etc. In another embodiment, the computer program may also be transmitted and distributed in the form of signals on a network medium, and downloaded and installed through the communication part 509, and / or installed from the removable medium 511. The program code contained in the computer program may be transmitted using any appropriate network medium, including but not limited to: wireless, wired, etc., or any suitable combination of the above.

[0141] According to an embodiment of the present disclosure, the program code for executing the computer program provided by the embodiment of the present disclosure can be written in any combination of one or more programming languages. Specifically, these computing programs can be implemented using high-level process and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, Java, C++, python, "C" language or similar programming languages. The program code can be executed entirely on the user computing device, partially on the user device, partially on the remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device can be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computing device (for example, using an Internet service provider to connect through the Internet).

[0142] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram may represent a module, a program segment, or a part of a code, and the above-mentioned module, program segment, or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box may also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions. It can be understood by those skilled in the art that the features recorded in the various embodiments of the present disclosure can be combined and / or combined in a variety of ways, even if such a combination or combination is not explicitly recorded in the present disclosure. In particular, without departing from the spirit and teaching of the present disclosure, the features described in the various embodiments of the present disclosure may be combined and / or combined in a variety of ways. All of these combinations and / or combinations fall within the scope of the present disclosure.

[0143] The embodiments of the present disclosure are described above. However, these embodiments are only for illustrative purposes and are not intended to limit the scope of the present disclosure. Although the embodiments are described above, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. Without departing from the scope of the present disclosure, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A method for obtaining the wear amount between a valve and a valve seat in an engine, characterized in that: The method comprises: Acquire structural parameters of a valve train of an engine, and environmental parameters of a valve and a valve seat, wherein the engine meets a preset valve head diameter, and the valve train is used to drive the mechanical movement of the valve; Performing dynamic calculation on the valve mechanism according to the structural parameters and the environmental parameters to obtain a first seating force and a seating speed, wherein the first seating force is a force generated when the gas valve hits the valve seat at the seating speed; According to the environmental parameters, the structural parameters and the seating speed, finite element calculation is performed on the gas valve and the valve seat to obtain impact stress, sliding stress and a first sliding distance; Based on the impact stress and the sliding stress satisfying the preset conditions, a finite element analysis is performed on the scaled model to obtain simulation parameters of the scaled model, wherein the scaled model is obtained by proportionally reducing the mechanical mechanisms of the gas valve and the valve seat; Based on the pressure equivalent mechanism, the second seating force of the scaled model is calculated according to the first seating force and the first force-bearing area of ​​the gas valve and the valve seat and the second force-bearing area of ​​the scaled model; Redesigning the valve mechanism according to the simulation parameters, the second seating force and the seating speed to obtain a target valve mechanism corresponding to the scaled model; The amount of wear between the gas valve and the valve seat is calculated based on wear parameters between the gas valve and the valve seat, wherein the wear parameters are obtained by performing a wear test on the scaled model using the target valve train.

2. The method according to claim 1, characterized in that The structural parameters include the structural dimensions, materials and mass of the valve mechanism, and the environmental parameters include the temperature of the valve and valve seat in a working state and the first cylinder pressure.

3. The method according to claim 2, characterized in that The performing of finite element calculation on the gas valve and the valve seat according to the environmental parameters, the structural parameters and the seating speed to obtain the impact stress, the sliding stress and the first sliding distance comprises: According to the temperature, the seating speed, the first cylinder pressure and the first spring preload, finite element calculation is performed on the air valve and the valve seat to obtain the impact stress, the sliding stress and the first sliding distance, the boundary conditions of the impact stress include the temperature, the acceleration of gravity, the first spring preload and the seating speed, the boundary conditions of the sliding stress and the first sliding distance include the temperature, the acceleration of gravity, the first cylinder pressure and the first spring preload, and the first spring preload is the preload of the first spring in the valve mechanism.

4. The method according to claim 3, characterized in that The preset condition is that the impact stress and the sliding stress remain unchanged and the boundary conditions of the impact stress and part of the boundary conditions of the sliding stress also remain unchanged, and the simulation parameters include a second spring preload corresponding to the impact stress, a second cylinder pressure corresponding to the sliding stress, and a second sliding distance.

5. The method according to claim 4, characterized in that The redesigning of the valve mechanism according to the simulation parameters, the second seating force and the seating speed to obtain a target valve mechanism corresponding to the scaled model comprises: When the second spring preload force, the second seating force and the seating speed remain unchanged, the valve mechanism is redesigned to obtain the target valve mechanism corresponding to the scaled model.

6. The method according to claim 1, characterized in that The wear parameters include impact wear coefficient, impact wear constant and sliding wear coefficient; Calculating the amount of wear between the gas valve and the valve seat according to the wear parameters between the gas valve and the valve seat comprises: The impact wear amount between the gas valve and the valve seat is calculated according to the impact wear coefficient and the impact wear constant between the gas valve and the valve seat, wherein the impact wear coefficient and the impact wear constant are obtained by performing an impact wear test on the scaled model using the target valve structure; The sliding wear amount between the gas valve and the valve seat is calculated according to the sliding wear coefficient between the gas valve and the valve seat, wherein the sliding wear coefficient is obtained by performing a sliding wear test on the scaled model using the target valve structure; The wear amount between the gas valve and the valve seat is determined based on the impact wear amount and the sliding wear amount.

7. The method according to claim 6, characterized in that The formula for the impact wear amount is as follows: W C is the impact wear amount, w c is the impact wear mass, K is the wear coefficient, N is the number of cycles, m is determined according to the mass of the valve in the valve mechanism, the mass of the valve follower in the valve mechanism and the mass of the first spring, v is the seating speed, n is the wear constant, and ρ is the material density of the mechanical mechanism of the valve and the valve seat.

8. The method according to claim 6, characterized in that The formula for the sliding wear amount is as follows: W H is the sliding wear amount, λ is the wear coefficient, P is the normal load, L is the sliding distance, and H is the material hardness of the mechanical mechanism.

9. The method according to claim 1, characterized in that: The formula for the pressure equivalent mechanism is as follows: F1 / A1=F2 / A2 F1 is the first seating force, A1 is the first contact area between the air valve and the valve seat, F2 is the second seating force, A2 is the second contact area between the scaled air valve and the scaled valve seat in the scaled model.

10. A device for obtaining the amount of wear between a gas valve and a valve seat in an engine, characterized in that: The device comprises: An acquisition module, used to acquire structural parameters of a valve mechanism of an engine, and environmental parameters of a valve and a valve seat, wherein the engine meets a preset valve head diameter, and the valve mechanism is used to drive the mechanical movement of the valve; a first calculation module, configured to perform a dynamic calculation on the valve mechanism according to the structural parameters and the environmental parameters to obtain a first seating force and a seating speed, wherein the first seating force is a force generated when the gas valve hits the valve seat at the seating speed; A second calculation module is used to perform finite element calculation on the gas valve and the valve seat according to the environmental parameters, the structural parameters and the seating speed to obtain impact stress, sliding stress and a first sliding distance; A finite element analysis module, configured to perform finite element analysis on the scaled model based on the impact stress and the sliding stress satisfying preset conditions, so as to obtain simulation parameters of the scaled model, wherein the scaled model is obtained by proportionally reducing the mechanical mechanisms of the gas valve and the valve seat; A third calculation module is used to calculate the second seating force of the scaled model based on the pressure equivalent mechanism according to the first seating force and the first force-bearing area of ​​the gas valve and the valve seat and the second force-bearing area of ​​the scaled model; a redesign module, used for redesigning the valve mechanism according to the simulation parameters, the second seating force and the seating speed, to obtain a target valve mechanism corresponding to the scaled model; The fourth calculation module is used to calculate the amount of wear between the gas valve and the valve seat according to the wear parameters between the gas valve and the valve seat, wherein the wear parameters are obtained by performing a wear test on the scaled model using the target valve mechanism.

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