Friction force prediction method and related equipment
By obtaining the speed and dimensions of moving parts in the engine, as well as the load constant, and combining the lubrication coefficient of the lubricant, the friction force of the moving parts can be predicted. This solves the problem of numerous and difficult-to-obtain parameters in the prior art, and achieves rapid and effective prediction of friction force.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SAIC MOTOR
- Filing Date
- 2024-11-07
- Publication Date
- 2026-05-08
AI Technical Summary
Existing technologies require numerous parameters for predicting friction, which are difficult to obtain, resulting in long prediction cycles and low efficiency, which is detrimental to industrial design and production.
By obtaining the speed and size of the moving parts moving along the oil film formed by the lubricant in the engine, as well as the engine's load constant, the equivalent contact area between the moving parts and the oil film is determined, and the frictional force of the moving parts is predicted using the lubrication coefficient of the lubricant, the speed of the moving parts, and the load constant.
It enables rapid prediction of friction force, the required data is easy to obtain, the method is simple and has low computational requirements on the execution equipment, thus improving prediction efficiency.
Smart Images
Figure CN121997445A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of automotive technology, and in particular to a friction prediction method, friction prediction device, controller, computer-readable storage medium, and computer program product. Background Technology
[0002] The engine is a crucial component of a car, used to convert other forms of energy, such as electrical and chemical energy, into mechanical energy to drive the vehicle. The stable operation of the engine relies on the precise coordination and cooperation between its various moving parts, inevitably generating friction during this process.
[0003] Friction not only causes some of the engine's energy to be lost as heat, but it can also accelerate the wear and tear on engine parts, shortening the engine's lifespan. Therefore, it is necessary to accurately predict the frictional forces of moving parts inside the engine, which will facilitate the design, maintenance, and management of the engine.
[0004] Current friction prediction is often modeled and predicted using finite element analysis (FEA) software. However, this prediction method requires a large number of parameters that are not easy to obtain, resulting in a long prediction cycle and low efficiency, which is not conducive to industrial design and production. Summary of the Invention
[0005] In view of this, this application provides a friction force prediction method and related equipment to solve the problem that the parameters of the moving parts required for prediction are numerous and difficult to obtain, resulting in a long prediction cycle and low efficiency.
[0006] In a first aspect, this application provides a method for predicting frictional force, the method comprising:
[0007] The controller acquires the speed and dimensions of moving parts in the engine that move along the oil film formed by the lubricant, as well as the engine's load constant, and determines the equivalent contact area between the moving parts and the oil film based on the dimensions of the moving parts. Then, the controller predicts the frictional force of the moving parts based on the equivalent contact area, the lubrication coefficient of the lubricant, the speed of the moving parts, and the engine's load constant.
[0008] In some possible implementations, the controller can also predict the equivalent pressure exerted by the frictional force of moving parts on the engine. Specifically, the controller can obtain the number of cylinders and the working volume of each cylinder in the engine, and determine the frictional torque of the moving parts based on their frictional force and dimensions. The controller can then predict the equivalent pressure exerted by the frictional force of the moving parts on other components in the engine based on the frictional torque of the moving parts, as well as the number of cylinders and the working volume of each cylinder.
[0009] In some possible implementations, when the predicted value of the frictional force of a moving part meets a certain numerical range, the controller can determine the characteristic information of the moving part to complete its design. That is, the controller can first predict the frictional force based on the dimensions of the moving part, and then design the detailed features of the moving part when the frictional force reaches a preset numerical range. For example, the characteristic information may include the material of the moving part, its internal structural information, its machining accuracy, its ambient temperature, or other conditions affecting its state. Among these, unlike the external dimensions of the moving part, the internal structural information includes its structural details. For example, when the moving part consists of multiple parts, its internal structural information may include the specific location of each part and features such as holes, grooves, protrusions, cuts, and fillets.
[0010] In this way, when the predicted value of the friction force of the moving part does not meet the preset conditions, the dimensions and other parameters of the moving part can be modified directly and quickly, reducing the difficulty and workload of modification for relevant technicians.
[0011] In some possible implementations, the moving parts can include rotary or reciprocating moving parts. Rotary moving parts refer to components or assemblies that rotate about a certain axis, such as journals or gears. Reciprocating moving parts refer to components or parts that perform periodic reciprocating motion in equipment, such as pistons, cylinders, or sliders.
[0012] In some possible implementations, when the moving part is a rotary motion part, the controller can also obtain the rotational speed of the moving part and determine the motion speed of the rotary motion part based on the rotational speed and size. That is, the motion speed required by the controller is the linear velocity of the rotary motion part.
[0013] An engine may contain multiple rotating or reciprocating moving parts. The controller can determine the engine's friction index based on the friction forces of the rotating and reciprocating parts. For example, the controller can determine the total friction force of the engine's moving parts by summing the friction forces of the rotating and reciprocating parts; alternatively, it can determine the average friction force of the engine's moving parts using a weighted average method. The controller can then determine whether the engine's performance meets requirements based on the friction index and indicate whether modifications to parameters such as the dimensions of the moving parts are necessary.
[0014] Secondly, this application provides a friction force prediction device, which includes modules for performing the friction force prediction method in the first aspect or any possible implementation of the first aspect, specifically including:
[0015] The acquisition module is used to acquire the speed and size of moving parts in the engine that move along the oil film formed by the lubricant, as well as to acquire the engine's load constant;
[0016] The prediction module is used to determine the equivalent contact area between the moving part and the oil film based on the size of the moving part;
[0017] The prediction module is also used to predict the frictional force of moving parts based on the equivalent contact area, the lubrication coefficient of the lubricant, the speed of the moving parts, and the load constant of the engine.
[0018] In some possible implementations, the acquisition module can also obtain the number of engine cylinders and the working volume of a single cylinder. In this case, the prediction module can be used for:
[0019] Based on the frictional force and dimensions of the moving parts, the frictional torque of the moving parts is determined. Based on the frictional torque of the moving parts, as well as the number of cylinders and the working volume of a single cylinder in the engine, the equivalent pressure exerted by the frictional force of the moving parts on other components in the engine is predicted.
[0020] In some possible implementations, the friction prediction device may further include a characteristic parameter determination module, which can be used to:
[0021] Once the predicted value of the friction force of the moving part meets the numerical range, the characteristic parameters of the moving part are determined to complete the design of the moving part.
[0022] The moving part can include a rotary moving part or a reciprocating moving part. In some possible implementations, the acquisition module can also be used to obtain the rotational speed of the rotary moving part, in which case the prediction module can also be used for:
[0023] The speed of the rotating component is determined based on its rotational speed and the dimensions of the rotating component.
[0024] In some possible implementations, the prediction module can also be used for:
[0025] The friction index of the engine is determined based on the friction of the rotating parts and the reciprocating parts.
[0026] Thirdly, this application provides a controller. The controller includes a processor and a memory. The memory stores computer instructions; the processor executes the methods described in the first aspect of this application or any possible implementation thereof, according to the computer instructions.
[0027] Fourthly, this application provides a computer-readable medium storing instructions that, when executed on a computer device, cause the computer device to perform the method described in the first aspect of this application or any possible implementation thereof.
[0028] Fifthly, this application provides a computer program product containing instructions that, when run on a computer, cause the computer to perform the method described in the first aspect of this application or any possible implementation thereof.
[0029] Based on the implementation methods provided in the above aspects, this application can be further combined to provide more implementation methods.
[0030] As can be seen from the above technical solutions, this application has at least the following advantages:
[0031] This application provides a method for predicting friction force. This method obtains the velocity and dimensions of a moving part in an engine that moves along an oil film formed by lubricant, as well as the engine's load constant, and determines the equivalent contact area between the moving part and the oil film based on the moving part's dimensions. Then, based on the equivalent contact area, the lubrication coefficient of the lubricant, the velocity of the moving part, and the engine's load constant, the friction force of the moving part is predicted. The data required by this method can be obtained quickly through measurement and querying, enabling rapid prediction of friction force with high feasibility. Furthermore, this method is simple to implement and has low computational requirements for the execution equipment. Attached Figure Description
[0032] Figure 1 This is a flowchart of a friction force prediction method disclosed in an embodiment of this application;
[0033] Figure 2A This is a schematic diagram illustrating the motion mode of a moving component as disclosed in an embodiment of this application;
[0034] Figure 2B This is a schematic diagram illustrating another motion mode of a moving component disclosed in an embodiment of this application;
[0035] Figure 3 The Stribek curve of a lubricant disclosed in an embodiment of this application;
[0036] Figure 4 This is a schematic diagram of the structure of a friction force prediction device disclosed in an embodiment of this application. Detailed Implementation
[0037] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific implementation methods.
[0038] The terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. The terms "first" and "second" in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance, chronological order of operations, or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.
[0039] First, some technical terms involved in the embodiments of this application will be introduced.
[0040] An engine, also known as a motor or engine, is a crucial component of a car. It converts other forms of energy, such as electrical or chemical energy, into mechanical energy to power the vehicle. Examples of engines include gasoline engines, diesel engines, electric motors, hydraulic presses, jet engines, and more.
[0041] The stable operation of an engine relies on the precise cooperation and coordination between its internal moving parts, inevitably generating friction. Friction not only causes some of the engine's energy to be lost as heat, but it can also accelerate the wear and tear on engine parts, shortening the engine's lifespan. Therefore, it is necessary to accurately predict the friction forces within the engine's internal moving parts, thereby facilitating engine design, maintenance, and management.
[0042] To reduce friction, especially sliding friction, generated by moving parts in an engine, lubricants are commonly used on the surfaces of these parts in industry. Lubricants are typically liquid and cover all or part of the moving part's surface. When the lubricant completely covers the moving part's surface, the moving part will achieve a state of no contact with the original contact surface where no lubricant was added.
[0043] Based on the degree of lubricant coverage on the surface of the moving part, i.e., the size of the contact area between the moving part and the original contact surface, lubrication can be categorized into boundary lubrication, mixed lubrication, and hydrodynamic lubrication. Boundary lubrication refers to the situation where the moving part and the contact surface are in close contact; in this case, the coefficient of friction μ is mainly related to the roughness of the moving part surface and the contact surface. Mixed lubrication refers to the situation where the moving part and the contact surface are in partial contact; in this case, there is both a certain thickness of lubricant film and a certain degree of surface contact between the moving part and the contact surface. Hydrodynamic lubrication, also known as complete lubrication, occurs when the moving part will have no contact with the original contact surface without lubricant; in this case, the coefficient of friction μ will be mainly related to the characteristics of the lubricant.
[0044] The moving parts of an engine are often in a state of fluid lubrication during operation, resulting in a low coefficient of friction, making it difficult to directly measure the frictional force of these parts experimentally. Related technologies often use finite element analysis (FEA) software for modeling and prediction. However, because this prediction method requires modeling the moving parts, it needs to obtain all the detailed information about them, resulting in a large number of parameters that are difficult to obtain. This leads to a long prediction cycle, low efficiency, and is detrimental to industrial design and production.
[0045] In view of this, this application provides a friction force prediction method and related apparatus to solve the problem that the parameters of the moving parts required for prediction are numerous and difficult to obtain, resulting in a long prediction cycle and low efficiency.
[0046] Specifically, the controller acquires the speed and size of moving parts in the engine that move along the oil film formed by the lubricant, as well as the engine's load constant, and determines the equivalent contact area between the moving parts and the oil film based on the size of the moving parts. Then, the controller predicts the frictional force of the moving parts based on the equivalent contact area, the lubrication coefficient of the lubricant, the speed of the moving parts, and the engine's load constant.
[0047] The data required for this method can be obtained quickly and easily through measurement and querying, enabling rapid prediction of frictional force with high feasibility. Furthermore, the method is simple to implement and places low demands on the computational capabilities of the executing device.
[0048] The method provided in this application will be described below with reference to specific embodiments.
[0049] Figure 1 This is a flowchart of a friction prediction method disclosed in an embodiment of this application. The method includes:
[0050] S102: The controller acquires the speed and size of moving parts in the engine that move along the oil film formed by the lubricant, and acquires the load constant of the engine.
[0051] Moving parts can include rotary moving parts or reciprocating moving parts. Rotary moving parts refer to parts or components that rotate about a certain axis, such as journals and gears. Reciprocating moving parts refer to parts or components that perform periodic reciprocating motion in equipment, such as pistons, cylinders, and sliders.
[0052] The speed of a moving part refers to the relative speed between friction pairs. For example, when the moving part is a journal, the speed of the moving part is the linear speed of the journal surface sliding relative to the bearing. In some possible implementations, when the moving part is a rotary moving part, the controller can also acquire the rotational speed of the moving part and determine the speed of the rotary moving part based on the rotational speed and the size of the moving part.
[0053] The dimensions of a moving part refer to its external dimensions, which are used to determine the equivalent contact area when the moving part generates frictional force. Its value is easy to measure or obtain.
[0054] The load constant of an engine is related to its structure. For engines with the same number of cylinders, the same displacement, and the same burst pressure, the load constant is a definite value, which can be provided by the manufacturer of the relevant engine components or determined during the engine design process.
[0055] S104: The controller determines the equivalent contact area between the moving part and the oil film based on the size of the moving part.
[0056] The pressure W between the moving part and the oil film can be determined by the pressure P per unit area of contact and the equivalent contact area S between the moving part and the oil film, specifically:
[0057] P = W / S
[0058] Figure 2A and Figure 2B The diagram illustrates the motion of a cylindrical moving part. It shows the dimensions of the moving part required to determine the equivalent contact area between the moving part and the oil film. The specific formula for this determination is:
[0059] S = D * B
[0060] Where D is the diameter of the cylinder and B is the height of the cylinder. Figure 2A The direction of 'v' indicates that the moving part is rotating, for example, Figure 2A This can represent the scenario where the journal rotates under the support of the bearing. In this case, D in the formula is the diameter of the journal, and B is the opening width of the journal. Figure 2B The direction of 'v' in the equation indicates that the moving part is performing reciprocating motion. It should be noted that... Figure 2A The journal in the middle can rotate either clockwise or counterclockwise; Figure 2B The moving parts in the process can move either in the direction of the arrow v or in the opposite direction; this application does not impose any restrictions on this.
[0061] S106: The controller predicts the frictional force of the moving parts based on the equivalent contact area, the lubrication coefficient of the lubricant, the speed of the moving parts, and the load constant of the engine.
[0062] The frictional force f of the moving part can be determined by the friction coefficient μ and the pressure W between the moving part and the oil film formed by the lubricant, specifically:
[0063] f = μ * W
[0064] Among them, the friction coefficient μ is related to the lubrication coefficient C1 of the lubricant and the thickness h of the oil film. The thickness h of the oil film is related to the absolute viscosity (also known as dynamic viscosity) η of the lubricant, the moving speed v of the moving part, and the contact pressure per unit area P. The specific relationship is as follows:
[0065] μ=C1*h-C0
[0066] h=*η*v / P
[0067] The above relationship is obtained by fitting a portion of the Stribeck curve of the lubricant in the fluid lubrication region. The Stribeck curve of one lubricant is shown below. Figure 3 As shown. The lubrication coefficient C1 of the lubricant can be provided by the lubricant manufacturer.
[0068] Based on the above relationships, the controller can predict the frictional force of the moving parts according to the equivalent contact area, the lubrication coefficient of the lubricant, the speed of the moving parts, and the load constant of the engine. The specific formula is as follows:
[0069] f=C1*η*v*S-C0*W
[0070] Wherein, C0*W is the engine load constant. For engines with the same number of cylinders, the same displacement, and the same burst pressure, its load constant is a definite value. It should be noted that, since the lubrication coefficient C1 and the absolute viscosity η are both definite constants for the same lubricant, the controller can obtain the lubrication coefficient C1 and the absolute viscosity η of the lubricant separately, or it can directly obtain the value of their product. This application does not limit this.
[0071] In some possible implementations, the controller can also predict the equivalent pressure exerted on the engine by the frictional forces of moving parts. This facilitates the design and analysis of other components within the engine. Specifically, the controller can obtain the number of cylinders and the working volume of each cylinder, and determine the frictional torque of the moving parts based on their frictional forces and dimensions. For example, for Figure 2B The formula for the friction torque of the moving parts in the process can be:
[0072] T = f * D / 2
[0073] =C1*η*v*D 2 *B / 2-C0*W*D / 2
[0074] Then, the controller can determine the frictional torque T of the moving part, as well as the number of cylinders i and the working volume V of each cylinder. s This predicts the equivalent pressure N exerted by the frictional force of moving parts on other components in the engine. For example, for Figure 2B The formula for the equivalent pressure N exerted by the frictional force of a moving part on other components in the engine is:
[0075]
[0076] In some possible implementations, when the predicted value of the frictional force of a moving part meets a certain numerical range, the controller can determine the characteristic information of the moving part to complete its design. For example, the frictional force generated by the rotational motion of the journal within a bearing needs to be less than a threshold to ensure smooth operation and reduce wear. For the piston and cylinder liner, the frictional force must be neither too small, leading to poor piston ring sealing, causing gas leakage and power loss; nor too large, thereby accelerating piston and cylinder liner wear and shortening engine life.
[0077] In other words, the controller can first predict the frictional force based on the dimensions of the moving part, and then design the detailed features of the moving part when the frictional force reaches a preset range. For example, feature information may include the material of the moving part, its internal structure information, its machining accuracy, its ambient temperature, or other conditions affecting its motion. Among these, unlike the external dimensions of the moving part, the internal structure information includes its structural details. For example, when the moving part consists of multiple parts, its internal structure information may include the specific location of each part and features such as holes, grooves, protrusions, cuts, and fillets.
[0078] In this way, when the predicted value of the friction force of the moving part does not meet the preset conditions, the dimensions and other parameters of the moving part can be modified directly and quickly, reducing the difficulty and workload of modification for relevant technicians.
[0079] In some possible implementations, the engine may contain multiple rotating or reciprocating moving parts. The controller can determine the engine's friction index based on the friction forces of the rotating and reciprocating moving parts. For example, the controller can determine the total friction force of the engine's moving parts by summing the friction forces of the rotating and reciprocating moving parts; alternatively, it can determine the average friction force of the engine's moving parts using a weighted average method. The controller can then determine whether the engine's performance meets requirements based on the friction index and indicate whether modifications to parameters such as the dimensions of the moving parts are necessary.
[0080] Based on the above description, this application provides a friction prediction method and related apparatus to solve the problem that the parameters of the moving parts required for prediction are numerous and difficult to obtain, resulting in a long prediction cycle and low efficiency.
[0081] Specifically, the controller acquires the speed and size of moving parts in the engine that move along the oil film formed by the lubricant, as well as the engine's load constant, and determines the equivalent contact area between the moving parts and the oil film based on the size of the moving parts. Then, the controller predicts the frictional force of the moving parts based on the equivalent contact area, the lubrication coefficient of the lubricant, the speed of the moving parts, and the engine's load constant.
[0082] The data required for this method can be obtained quickly and easily through measurement and querying, enabling rapid prediction of frictional force with high feasibility. Furthermore, the method is simple to implement and places low demands on the computational capabilities of the executing device.
[0083] Based on the friction prediction method described above, this application also provides a friction prediction device. The device of this application will be described in detail below with reference to the accompanying drawings.
[0084] See Figure 4 The diagram shows a structural schematic of a friction force prediction device, which specifically includes:
[0085] The acquisition module 402 is used to acquire the speed and size of moving parts in the engine that move along the oil film formed by the lubricant, and to acquire the load constant of the engine;
[0086] The prediction module 404 is used to determine the equivalent contact area between the moving part and the oil film based on the size of the moving part.
[0087] The prediction module 404 is also used to predict the frictional force of the moving parts based on the equivalent contact area, the lubrication coefficient of the lubricant, the speed of the moving parts, and the load constant of the engine.
[0088] In some possible implementations, the acquisition module 402 can also acquire the number of engine cylinders and the working volume of a single cylinder. In this case, the prediction module 404 can be used for:
[0089] Based on the frictional force and dimensions of the moving parts, the frictional torque of the moving parts is determined. Based on the frictional torque of the moving parts, as well as the number of cylinders and the working volume of a single cylinder in the engine, the equivalent pressure exerted by the frictional force of the moving parts on other components in the engine is predicted.
[0090] In some possible implementations, the friction prediction device may further include a characteristic parameter determination module, which can be used to:
[0091] Once the predicted value of the friction force of the moving part meets the numerical range, the characteristic parameters of the moving part are determined to complete the design of the moving part.
[0092] The moving part can include a rotary moving part or a reciprocating moving part. In some possible implementations, the acquisition module 402 can also be used to acquire the rotational speed of the rotary moving part, in which case the prediction module 404 can also be used to:
[0093] The speed of the rotating component is determined based on its rotational speed and the dimensions of the rotating component.
[0094] In some possible implementations, the prediction module 404 can also be used for:
[0095] The friction index of the engine is determined based on the friction of the rotating parts and the reciprocating parts.
[0096] Based on the aforementioned friction prediction method and device, this application also provides a controller. This controller may be, for example, a vehicle control unit (VCU) or an electronic control unit (ECU). The controller includes a processor and a memory. The memory stores computer-readable instructions, and the processor executes these computer-readable instructions to perform the aforementioned friction prediction method. In some examples, the controller is used to implement the functions of the aforementioned friction prediction device.
[0097] The modules described above as separate components may or may not be physically separate. Similarly, the components shown as modules may or may not be physical modules; they may be located in one place or distributed across multiple virtual modules. Some or all of the modules can be selected to achieve the purpose of this embodiment, depending on actual needs.
[0098] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.
[0099] If the integrated module is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the essential contribution of the technical solution of this application, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the processes of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory, random access memory, magnetic disks, or optical disks.
[0100] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A method for predicting friction force, characterized in that, The method includes: The speed and dimensions of moving parts in the engine that move along the oil film formed by the lubricant are obtained, as well as the load constant of the engine is obtained; The equivalent contact area between the moving part and the oil film is determined based on the dimensions of the moving part. The frictional force of the moving part is predicted based on the equivalent contact area, the lubrication coefficient of the lubricant, the speed of the moving part, and the load constant of the engine.
2. The method according to claim 1, characterized in that, The method further includes: Obtain the number of cylinders and the working volume of a single cylinder of the engine; The frictional torque of the moving part is determined based on the frictional force and the dimensions of the moving part. Based on the frictional torque of the moving part, the number of cylinders of the engine, and the working volume of a single cylinder, the equivalent pressure exerted by the frictional force of the moving part on other components of the engine is predicted.
3. The method according to claim 1, characterized in that, The method further includes: When the predicted value of the friction force of the moving part meets the numerical range, the characteristic information of the moving part is determined to complete the design of the moving part.
4. The method according to claim 3, characterized in that, The feature information includes at least one of the following: the material of the moving part, the internal structure information of the moving part, the machining accuracy of the moving part, or the ambient temperature of the moving part.
5. The method according to any one of claims 1 to 4, characterized in that, The moving parts include rotary moving parts or reciprocating moving parts.
6. The method according to claim 5, characterized in that, The method further includes: The friction index of the engine is determined based on the friction force of the rotary motion component and the friction force of the reciprocating motion component.
7. A device for predicting the friction force of a moving part, characterized in that, The device includes: The acquisition module is used to acquire the speed and size of moving parts in the engine that move along the oil film formed by the lubricant, and to acquire the load constant of the engine; The prediction module is used to determine the equivalent contact area between the moving part and the oil film based on the dimensions of the moving part; The prediction module is further configured to predict the frictional force of the moving part based on the equivalent contact area, the lubrication coefficient of the lubricant, the speed of the moving part, and the load constant of the engine.
8. A controller, characterized in that, The controller includes: Memory is used to store computer programs or computer instructions; A processor for executing a computer program or computer instructions stored in the memory, causing the motor controller to perform the method as described in any one of claims 1 to 6.
9. A computer storage medium, characterized in that, The computer storage medium is used to store a computer program, which, when executed, is used to implement the method as described in any one of claims 1 to 6.
10. A computer program product, characterized in that, When the computer program product is run on a computer, it causes the computer to perform the method as described in any one of claims 1 to 6.