Clutch life evaluation method and device, vehicle and medium

Abstract

The invention relates to the technical field of clutches, and discloses a clutch service life evaluation method and device, a vehicle and a medium, and the clutch service life evaluation method comprises the following steps: establishing a relation curve of a clutch friction material at different working temperatures and the working duration of reaching a set abrasion loss, and performing segmented regression analysis on the relation curve in combination with a set reference temperature; the accuracy of the segmented regression equation near the reference temperature is guaranteed, and then a clutch service life evaluation model with the working time and the working temperature of the clutch as variables is constructed through the segmented regression equation, so that clutch service life evaluation is conducted through the real relation between the working temperature of the friction material and the working duration. According to the method, the accuracy of the evaluation result of the service life of the clutch is guaranteed, unified real-time quantifiable fine evaluation on the service life of the clutch is realized, the wear trend and the health decline state of the clutch friction plate in long-term use can be reflected more accurately, and accurate maintenance suggestions and vehicle use suggestions are conveniently provided for users.

Description

Technical Field

[0001] The present invention relates to the technical field of clutches, and in particular to a clutch life assessment method, device, vehicle and medium. Background Art

[0002] With the development of intelligent and digital automotive management, automotive clutches, as key and consumable components in vehicle transmission systems, have a high friction performance that directly impacts driving comfort and safety. Traditional clutch life assessment methods often rely on qualitative judgments based on fault codes, lacking a precise solution for evaluating clutch life under dynamic operating conditions. Summary of the Invention

[0003] In view of this, the present invention provides a clutch life assessment method, device, vehicle and medium to solve the problem in related technologies that it is difficult to accurately assess the clutch life under dynamic working conditions.

[0004] In a first aspect, the present invention provides a clutch life assessment method, the method comprising:

[0005] Obtain the working time of the friction material corresponding to the target clutch to reach the set wear amount at different working temperatures, and establish a relationship curve between working temperature and working time;

[0006] Determine a reference temperature, and perform a segmented regression analysis on the relationship curve based on the reference temperature to obtain a segmented regression equation of the operating temperature and the working time;

[0007] Based on the piecewise regression equation, a clutch life evaluation model is constructed with clutch operating time and operating temperature as variables;

[0008] The actual operating temperature of the target clutch corresponding to different sampling times within the current operating time is obtained, and the current operating time and the actual operating temperature corresponding to different sampling times are input into the clutch life assessment model to obtain the life assessment result of the target clutch.

[0009] The present invention establishes a relationship curve between the clutch friction material at different operating temperatures and the working time to reach a set amount of wear, and performs a segmented regression analysis on the relationship curve in combination with a set reference temperature to ensure the accuracy of the segmented regression equation near the reference temperature. The segmented regression equation is then used to construct a clutch life assessment model with the clutch working time and working temperature as variables, thereby utilizing the true relationship between the working temperature of the friction material and the working time to assess the clutch life, thereby ensuring the accuracy of the clutch life assessment results and achieving a unified, real-time, quantifiable, and detailed assessment of the clutch life. This can more accurately reflect the wear trend and health decline status of the clutch friction plate in long-term use, can provide users with precise maintenance suggestions and vehicle usage suggestions, and can also provide manufacturers with a scientific basis for troubleshooting, thereby reducing safety risks and after-sales costs caused by component failure.

[0010] In some optional embodiments, obtaining the operating time for the friction material corresponding to the target clutch to reach a set amount of wear at different operating temperatures includes:

[0011] Under laboratory conditions, the friction material is controlled to conduct multiple wear tests at each operating temperature, and the first time required for the friction material to reach the set wear amount in each test is recorded;

[0012] Based on the first times corresponding to the multiple tests at the current working temperature, the working time corresponding to the friction material at the current working temperature is determined.

[0013] The present invention can effectively eliminate the interference of a single test by conducting multiple wear tests on the friction material under different temperature conditions under laboratory conditions, and then use the time to reach the set wear amount obtained from multiple tests to determine the working time corresponding to the working temperature, thereby improving the accuracy of the correspondence between the working temperature and the working time, providing an accurate data basis for the subsequent construction of a clutch life assessment model, and further improving the accuracy of the final clutch life assessment result.

[0014] In some optional embodiments, determining the reference temperature includes:

[0015] Obtain historical operating temperature data of the target clutch;

[0016] At least one first temperature with the longest operating time in the historical operating temperature data is determined as a reference temperature.

[0017] The present invention analyzes the historical operating temperature of the clutch during long-term use and determines the temperature corresponding to its commonly used temperature working condition as the reference temperature, thereby ensuring that the corresponding piecewise regression equation under the commonly used temperature working condition of the clutch can truly reflect the true correspondence between the commonly used temperature working condition and the working time of the clutch friction material, further ensuring the accuracy of subsequent clutch life evaluation results under commonly used temperature working conditions, and realizing personalized clutch life evaluation for vehicles driven by different users in different regions. Compared with the traditional fixed evaluation method, it is more in line with the actual vehicle operating conditions.

[0018] In some optional implementations, when the target clutch is a wet clutch, determining the reference temperature includes:

[0019] Obtaining at least one critical temperature corresponding to a change in the state of an oil film formed on a friction plate surface of a target clutch;

[0020] The critical temperature is determined as the reference temperature.

[0021] Since changes in the state of the oil film on the friction plate surface of a wet clutch will affect the working state of the clutch and may also cause abnormal wear of the clutch, the present invention monitors the state of the oil film on the friction plate surface of the wet clutch during actual use, and uses the critical temperature corresponding to the change in the oil film state as the reference temperature. Therefore, the corresponding segmented regression equation before and after the change in the clutch working state can more accurately reflect the true correspondence between the working temperature and the working time of the clutch friction material, further ensuring the accuracy of the subsequent clutch life assessment results, and realizing refined life assessment of the clutch under different working states. Compared with the traditional fixed assessment method, it is more in line with the actual vehicle operating conditions.

[0022] In some optional embodiments, the piecewise regression equation is as follows:

[0023]

[0024] Wherein, T represents the current operating temperature of the clutch, T0 represents the reference temperature, t0 represents the working time, k1 and k2 represent the regression equation coefficients, and b1 and b2 are the constant terms of the regression equation.

[0025] The present invention establishes a linear piecewise regression equation of the clutch operating temperature and the working time by using a logarithmic function, which can meet the accuracy of the corresponding relationship between the operating temperature near the reference temperature and the working time. The linear regression equation is simpler in form, which facilitates the subsequent construction of the clutch life evaluation model, further reduces the error of the clutch life evaluation model, and improves the accuracy of the final life evaluation result.

[0026] In some optional embodiments, the life assessment result includes: the current remaining life percentage of the clutch, and the clutch life assessment model is as follows:

[0027]

[0028] Where H is the current remaining life percentage of the clutch, T1 is the current operating time of the clutch, t is the sampling time in the vehicle controller, a is the design safety factor, and a ≥ 1, k is the regression equation coefficient corresponding to the operating temperature of the clutch at the current sampling time, and b is the regression equation constant corresponding to the operating temperature of the clutch at the current sampling time.

[0029] The present invention constructs a clutch life assessment model by performing time integration on the regression equation of the above-mentioned logarithmic function, converting the clutch life assessment into a unified assessment indicator, namely the current remaining life percentage of the clutch, thereby achieving more refined life prediction and providing a more refined data basis for subsequent maintenance suggestions and vehicle usage suggestions.

[0030] In some optional implementations, the life assessment result further includes: the remaining working time of the clutch at a reference temperature, and the method further includes:

[0031] Acquiring the current operating temperature of the target clutch;

[0032] Calculating the target working time corresponding to the current working temperature based on the piecewise regression equation;

[0033] Calculating the remaining operable time of the target clutch based on the target operable time and the current remaining life percentage;

[0034] The remaining working time is converted into the remaining working time at the reference temperature.

[0035] The present invention utilizes the current remaining life percentage of the clutch to uniformly convert the remaining working time of the clutch at different operating temperatures into the remaining working time at the reference temperature, thereby realizing a unified evaluation index for the remaining working time of the clutch, thereby achieving more refined life prediction and providing a more refined data basis for subsequent maintenance suggestions and vehicle use suggestions.

[0036] In some optional implementations, converting the remaining operable time into the remaining operable time at a reference temperature includes:

[0037] Calculating a ratio of the operating time corresponding to the reference temperature to the target operating time;

[0038] The product of the remaining working time and the ratio is calculated to obtain the remaining working time at the reference temperature.

[0039] The present invention utilizes the ratio between the working time corresponding to different temperatures and the working time corresponding to the reference temperature to equate the remaining working time corresponding to different working temperatures to the reference temperature, thereby facilitating unified processing of data under different temperature conditions.

[0040] In some optional embodiments, the method further comprises:

[0041] Uploading the life assessment result to the cloud, so that the cloud performs a health assessment on the target clutch based on the life assessment result, and sends the assessed health information to the user terminal corresponding to the vehicle where the target clutch is located;

[0042] And / or, uploading the life assessment result to the cloud, so that the cloud generates driving suggestions and / or maintenance suggestions based on the life assessment result, and sends the driving suggestions and / or maintenance suggestions to the user terminal.

[0043] The present invention implements clutch health assessment by analyzing and processing the life assessment results in the cloud, so that users can understand the health status of the clutch in real time through the user terminal. By combining with the Internet of Vehicles and cloud diagnostic technology, the application potential and promotion value of clutch life assessment are enhanced.

[0044] In a second aspect, the present invention provides a clutch life assessment device, comprising:

[0045] An acquisition module is used to obtain the working time of the friction material corresponding to the target clutch to reach a set wear amount at different working temperatures, and to establish a relationship curve between the working temperature and the working time;

[0046] A first processing module is configured to determine a reference temperature, and perform piecewise fitting on the relationship curve based on the reference temperature to obtain a piecewise regression equation of the operating temperature and the working time;

[0047] A second processing module is used to construct a clutch life evaluation model with clutch operating time and operating temperature as variables based on the piecewise regression equation;

[0048] The third processing module is used to obtain the actual working temperature of the target clutch corresponding to different sampling moments within the current working time, and input the current working time and the actual working temperature corresponding to different sampling moments into the clutch life assessment model to obtain the life assessment result of the target clutch.

[0049] In a third aspect, the present invention provides a vehicle, comprising a clutch, and further comprising: a controller, wherein the controller comprises:

[0050] The memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method described in the first aspect and any one of its optional embodiments by executing the computer instructions.

[0051] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the method provided in the first aspect or any corresponding embodiment thereof.

[0052] Beneficial effects of the present invention:

[0053] The present invention establishes a relationship curve between the clutch friction material at different operating temperatures and the working time to reach a set amount of wear, and performs a segmented regression analysis on the relationship curve in combination with a set reference temperature to ensure the accuracy of the segmented regression equation near the reference temperature. The segmented regression equation is then used to construct a clutch life assessment model with the clutch working time and working temperature as variables, thereby utilizing the true relationship between the working temperature of the friction material and the working time to assess the clutch life, thereby ensuring the accuracy of the clutch life assessment results and achieving a unified, real-time, quantifiable, and detailed assessment of the clutch life. This can more accurately reflect the wear trend and health decline status of the clutch friction plate in long-term use, can provide users with precise maintenance suggestions and vehicle usage suggestions, and can also provide manufacturers with a scientific basis for troubleshooting, thereby reducing safety risks and after-sales costs caused by component failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 is a flow chart of a clutch life evaluation method according to an embodiment of the present invention;

[0056] Figure 2 is a flow chart of another clutch life evaluation method according to an embodiment of the present invention;

[0057] Figure 3 is a schematic diagram of a Tt curve of a friction material according to an embodiment of the present invention;

[0058] Figure 4 is a schematic diagram of a process for constructing a clutch life assessment model according to an embodiment of the present invention;

[0059] Figure 5 is a schematic diagram of a specific application process of a clutch life assessment model according to an embodiment of the present invention;

[0060] Figure 6 is a schematic structural diagram of a clutch life evaluation device according to an embodiment of the present invention;

[0061] Figure 7 2 is a schematic structural diagram of a vehicle controller according to an embodiment of the present invention. DETAILED DESCRIPTION

[0062] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0063] In related technologies, clutch life assessment methods often make qualitative judgments based on fault codes, and lack an accurate assessment scheme for clutch life under dynamic conditions.

[0064] Based on this, an embodiment of the present invention provides a clutch life assessment solution. Based on the temperature-working time (Tt) map of the friction material, the clutch life assessment is performed by converting the actual working conditions into equivalent working time, which can more accurately reflect the wear trend and health decline status of the clutch friction plate in long-term use.

[0065] According to an embodiment of the present invention, an embodiment of a clutch life assessment method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0066] In this embodiment, a clutch life assessment method is provided, which can be applied to vehicle controllers such as single chip microcomputers, MCUs and other control chips. Figure 1 FIG. 1 is a flow chart of a clutch life evaluation method according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0067] Step S101 , obtaining the working time for the friction material corresponding to the target clutch to reach a set wear amount at different working temperatures, and establishing a relationship curve between the working temperature and the working time.

[0068] Specifically, the set wear amount can be set according to the actual vehicle's wear requirements for the clutch friction plate. For example, the set wear amount is when the friction material wear reaches 10%. For example, if the time it takes for a certain friction material to be used from the beginning to the wear reaching 10% at temperature A is B, then B is used as the corresponding working time of the friction material at temperature A.

[0069] In actual applications, because friction material wear is affected by the inherent properties of the thermometer friction material, different friction materials will have different operating times to reach a set amount of wear at the same temperature. Similarly, the same friction material will have different operating times to reach a set amount of wear at different temperatures. For example, the operating times for friction materials to reach a set amount of wear at different operating temperatures can be obtained by conducting wear tests on the friction material or by directly extracting data from a relevant friction material research database. It should be noted that the embodiments of the present invention use a wet paper-based friction material as an example for the friction material corresponding to the target clutch, i.e., the friction plate. In actual applications, the friction material may also be other types, such as copper-based, and this will not be discussed further here.

[0070] Step S102 : determining a reference temperature, and performing a segmented regression analysis on the relationship curve based on the reference temperature to obtain a segmented regression equation of the operating temperature and the working time.

[0071] Among them, the reference temperature is a temperature that has a significant impact on the health status of the clutch, that is, a temperature value that needs to be accurately analyzed to improve the accuracy of the clutch life assessment. In actual applications, the reference temperature can be one or more, and can be flexibly set according to the accuracy of the clutch life assessment and actual needs. The present invention is not limited to this.

[0072] Illustratively, the piecewise regression equation obtained by piecewise regression analysis may be a linear regression equation or a polynomial regression equation, and may be flexibly set and selected according to actual needs, and the present invention is not limited thereto.

[0073] Step S103: constructing a clutch life evaluation model with clutch operating time and operating temperature as variables based on the piecewise regression equation.

[0074] Specifically, since the relationship curve between the above-mentioned working temperature and the working time is generally in the form of a logarithmic function, the piecewise regression equation reflects the relationship between the working temperature and the working time. By integrating the logarithmic function, the relationship between the working time and the working time at different temperatures is converted into the loss ratio of the clutch life, and then a clutch life evaluation model with the clutch working time and working temperature as variables is constructed.

[0075] Step S104 , obtaining the actual operating temperature of the target clutch corresponding to different sampling times within the current operating time, and inputting the current operating time and the actual operating temperature corresponding to different sampling times into the clutch life assessment model to obtain the life assessment result of the target clutch.

[0076] Specifically, the actual operating temperature and operating hours of a clutch in a real vehicle, collected in real time during operation, are input into the clutch life assessment model constructed in the above steps to obtain a clutch life assessment result. For example, the clutch life assessment result can be a relative quantity, such as a percentage of remaining life, or an absolute quantity, such as the remaining life at a certain standard temperature, or a combination of both, though the present invention is not limited thereto.

[0077] The embodiment of the present invention establishes a relationship curve between the clutch friction material at different operating temperatures and the working time to reach a set amount of wear, and performs a segmented regression analysis on the relationship curve in combination with a set reference temperature to ensure the accuracy of the segmented regression equation near the reference temperature. Then, the segmented regression equation is used to construct a clutch life assessment model with the clutch working time and working temperature as variables, so as to utilize the true relationship between the working temperature of the friction material and the working time to assess the clutch life, thereby ensuring the accuracy of the clutch life assessment results and achieving a unified, real-time, quantifiable and detailed assessment of the clutch life. It can more accurately reflect the wear trend and health decline status of the clutch friction plate in long-term use, can provide users with accurate maintenance suggestions and vehicle use suggestions, and can also provide manufacturers with a scientific basis for problem troubleshooting, thereby reducing safety risks and after-sales costs caused by component failure.

[0078] In this embodiment, a clutch life assessment method is provided, which can be applied to vehicle controllers such as single chip microcomputers, MCUs and other control chips. Figure 2 FIG. 1 is a flow chart of a clutch life evaluation method according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0079] Step S201 : obtaining the working time required for the friction material corresponding to the target clutch to reach a set amount of wear at different working temperatures, and establishing a relationship curve between the working temperature and the working time.

[0080] Specifically, the operation time required for the friction material corresponding to the target clutch to reach a set amount of wear at different operating temperatures is obtained in step S201, including:

[0081] Step a1: Under laboratory conditions, the friction material is controlled to perform multiple wear tests at each operating temperature, and the first time required for the friction material to reach a set wear amount in each test is recorded.

[0082] Step a2: determining the working time of the friction material at the current working temperature based on the first times corresponding to multiple tests at the current working temperature.

[0083] Specifically, the average first time corresponding to multiple tests at the current operating temperature can be calculated and used as the corresponding operable operating time at the current operating temperature to eliminate errors and interference from individual tests. Furthermore, depending on actual clutch life assessment requirements, the maximum or minimum first time corresponding to multiple tests at the current operating temperature can be used as the corresponding operable operating time at the current operating temperature, but the present invention is not limited to this.

[0084] The embodiment of the present invention can effectively eliminate the interference of a single test by conducting multiple wear tests on the friction material under different temperature conditions under laboratory conditions, and then use the time to reach the set wear amount obtained from multiple tests to determine the working time corresponding to the working temperature, thereby improving the accuracy of the correspondence between the working temperature and the working time, providing an accurate data basis for the subsequent construction of a clutch life assessment model, and further improving the accuracy of the final clutch life assessment results.

[0085] Step S202 : determining a reference temperature, and performing a segmented regression analysis on the relationship curve based on the reference temperature to obtain a segmented regression equation of the operating temperature and the working time.

[0086] Specifically, determining the reference temperature in step S202 includes:

[0087] Step b1: Acquire historical operating temperature data of the target clutch.

[0088] Specifically, the clutch operating temperature of vehicles in the same area equipped with the same type of clutch as the target clutch can be monitored, and the monitoring results can be used as the historical operating temperature of the target clutch. The historical operating temperature of the target clutch can also be obtained by directly monitoring the clutch operating temperature of an actual vehicle equipped with the target clutch. The present invention is not limited to this.

[0089] Step b2: determining at least one first temperature with the longest working time in the historical working temperature data as a reference temperature.

[0090] For example, assuming that the clutch has been operating at 150°C for the longest time in its historical working process, the reference temperature can be selected as 150°C. In addition, several temperatures at which the clutch has been operating for the longest time in its historical working process can also be selected as reference temperatures to achieve more refined segmented regression analysis and improve the accuracy of the segmented regression equation.

[0091] The embodiment of the present invention analyzes the historical operating temperature of the clutch during long-term use and determines the temperature corresponding to its commonly used temperature working condition as the reference temperature, thereby ensuring that the corresponding piecewise regression equation under the commonly used temperature working condition of the clutch can truly reflect the true correspondence between the commonly used temperature working condition and the working time of the clutch friction material, further ensuring the accuracy of subsequent clutch life evaluation results under commonly used temperature working conditions, and realizing personalized clutch life evaluation for vehicles driven by different users in different regions. Compared with the traditional fixed evaluation method, it is more in line with the actual vehicle operating conditions.

[0092] When the target clutch is a wet clutch, in some alternative embodiments, determining the reference temperature in step S202 includes:

[0093] Step c1, obtaining at least one critical temperature corresponding to a change in the state of an oil film formed on the friction plate surface of the target clutch.

[0094] For example, for wet paper-based friction plates, the oil film forming on their surface changes state from liquid to gas at around 150°C. At this point, the clutch's operating state will change, and the clutch may also experience abnormal wear after the oil film vaporizes. Therefore, the temperature corresponding to this oil film state change has a significant impact on clutch health and requires special attention. In addition, at around 0°C, the oil film state changes from liquid to solid, and this change also affects the clutch's operating state, so it also requires special attention. In actual applications, one or more critical temperatures at which the oil film state changes can be used as reference temperatures based on actual needs to more accurately assess clutch life.

[0095] Step c2: determining the critical temperature as the reference temperature.

[0096] Since changes in the state of the oil film on the friction plate surface of a wet clutch will affect the working state of the clutch and may also cause abnormal wear of the clutch, the present invention monitors the state of the oil film on the friction plate surface of the wet clutch during actual use, and uses the critical temperature corresponding to the change in the oil film state as the reference temperature. Therefore, the corresponding segmented regression equation before and after the change in the clutch working state can more accurately reflect the true correspondence between the working temperature and the working time of the clutch friction material, further ensuring the accuracy of the subsequent clutch life assessment results, and realizing refined life assessment of the clutch under different working states. Compared with the traditional fixed assessment method, it is more in line with the actual vehicle operating conditions.

[0097] Furthermore, taking the linear regression equation as an example, the above piecewise regression equation is as follows:

[0098]

[0099] Wherein, T represents the current operating temperature of the clutch, T0 represents the reference temperature, t0 represents the working time, k1 and k2 represent the regression equation coefficients, and b1 and b2 are the constant terms of the regression equation.

[0100] For example, taking a wet paper-based friction plate as an example, the corresponding piecewise regression equation is as follows:

[0101]

[0102] The embodiment of the present invention establishes a linear piecewise regression equation between the clutch operating temperature and the working time by utilizing a logarithmic function, which can meet the accuracy of the corresponding relationship between the operating temperature near the reference temperature and the working time. The linear regression equation is simpler in form, which facilitates the subsequent construction of a clutch life assessment model, further reduces the error of the clutch life assessment model, and improves the accuracy of the final life assessment result.

[0103] Step S203: Based on the piecewise regression equation, a clutch life evaluation model is constructed with the clutch operating time and operating temperature as variables.

[0104] Specifically, based on the current remaining life percentage of the clutch and the segmented regression equation shown in the above formula (1), the clutch life evaluation model is as follows:

[0105]

[0106] Where H is the current remaining life percentage of the clutch, T1 is the current clutch operating time, t is the sampling time in the vehicle controller, a is the design safety factor, and a ≥ 1, k is the regression equation coefficient corresponding to the clutch operating temperature at the current sampling time, and b is the regression equation constant corresponding to the clutch operating temperature at the current sampling time. For example, a = 2 to meet the clutch design life requirement; when T ≥ T0, b = b1 and k = k1; otherwise, b = b2 and k = k2.

[0107] The embodiment of the present invention constructs a clutch life assessment model by performing time integration on the regression equation of the above-mentioned logarithmic function, converting the clutch life assessment into a unified assessment indicator, namely the current remaining life percentage of the clutch, thereby achieving more refined life prediction and providing a more refined data basis for subsequent maintenance suggestions and vehicle use suggestions.

[0108] Step S204 , obtaining the actual operating temperature of the target clutch corresponding to different sampling times within the current operating time, and inputting the current operating time and the actual operating temperature corresponding to different sampling times into the clutch life assessment model to obtain the life assessment result of the target clutch.

[0109] Specifically, the clutch operating temperature of the actual vehicle equipped with the target clutch is detected according to the sampling period of the vehicle controller during operation, and the actual working time of the clutch is recorded. The collected temperature value and actual working time are then substituted into the above formula (3) to obtain the current remaining life percentage of the target clutch.

[0110] Furthermore, the life assessment result also includes: the remaining working time of the clutch at the reference temperature. The clutch life assessment method provided by the embodiment of the present invention further includes the following steps:

[0111] Step d1, obtaining the current operating temperature of the target clutch.

[0112] Specifically, the operating temperature of the clutch can be collected by a temperature sensor provided on the vehicle.

[0113] Step d2: Calculate the target operating time corresponding to the current operating temperature based on the piecewise regression equation.

[0114] Specifically, the collected working temperature is substituted into the above formula (1) to obtain the target working time.

[0115] Step d3: Calculate the remaining operable time of the target clutch based on the target operable time and the current remaining life percentage.

[0116] Specifically, the remaining operable time of the target clutch can be obtained by calculating the product of the target operable time and the current remaining life percentage.

[0117] Step d4, converting the remaining working time into the remaining working time at the reference temperature.

[0118] The embodiment of the present invention utilizes the current remaining life percentage of the clutch to uniformly convert the remaining working time of the clutch at different operating temperatures into the remaining working time at the reference temperature, thereby realizing a unified evaluation index for the remaining working time of the clutch, thereby achieving more refined life prediction and providing a more refined data basis for subsequent maintenance suggestions and vehicle use suggestions.

[0119] In practical applications, the above step d4 includes: calculating the ratio of the working time corresponding to the reference temperature to the target working time; calculating the product of the remaining working time and the ratio to obtain the remaining working time at the reference temperature.

[0120] The embodiment of the present invention utilizes the ratio between the working time corresponding to different temperatures and the working time corresponding to the reference temperature to equate the remaining working time corresponding to different working temperatures to the reference temperature, thereby facilitating unified processing of data under different temperature conditions.

[0121] In step S205 , the life evaluation result is uploaded to the cloud, so that the cloud performs a health evaluation on the target clutch based on the life evaluation result, and sends the health information obtained from the evaluation to the user terminal corresponding to the vehicle where the target clutch is located.

[0122] Specifically, the cloud can analyze the lifespan assessment results using existing methods to assess the health of the target clutch, which will not be detailed here. The user terminal can be the vehicle-mounted system of the vehicle equipped with the target clutch, or a terminal such as a mobile phone or computer connected to the vehicle, and the present invention is not limited to these terminals, so that users can understand the health status of the clutch in real time.

[0123] Step S206 : uploading the life assessment result to the cloud, so that the cloud generates driving suggestions and / or maintenance suggestions based on the life assessment result, and sends the driving suggestions and / or maintenance suggestions to the user end.

[0124] Specifically, the cloud can analyze the lifespan assessment results using existing methods to generate driving recommendations and / or maintenance recommendations, which will not be further described here. It should be noted that the embodiments of the present invention are described using the example of executing both steps S205 and S206. This is merely an example and is not intended to be limiting. In actual applications, steps S205 and S206 can also be executed separately based on actual needs, such as executing only step S205 or only step S206.

[0125] The embodiment of the present invention implements clutch health assessment by utilizing the cloud to analyze and process the life assessment results, so that users can understand the health status of the clutch in real time through the user terminal. By combining it with the Internet of Vehicles and cloud diagnostic technology, the application potential and promotion value of clutch life assessment are enhanced.

[0126] The specific working process and working principle of the clutch life assessment method provided by the embodiment of the present invention will be described in detail below with reference to specific application examples.

[0127] The core concepts of the clutch life assessment solution provided by the embodiment of the present invention include:

[0128] Multi-dimensional data acquisition and dynamic mapping: Utilize friction material test data to construct a Tt map, collect clutch temperature and sliding wear data (i.e., the aforementioned working time) under different operating conditions in real time, and map the dynamic operating conditions into equivalent sliding wear time (i.e., working time).

[0129] Reference temperature conversion and redundancy correction: 150°C is used as the reference temperature. The sliding time at different temperatures is converted into equivalent time through integral calculation. A design safety factor (such as constant 2) is introduced to correct the characteristics of the friction material itself and environmental interference.

[0130] Digital simulation model: Construct a simulation model that includes a temperature judgment module, a constant correction module, and an operation module. Through numerical integration and regression analysis, the life assessment results of the clutch friction plate are obtained, and the health degradation trend is further predicted.

[0131] This solution integrates existing temperature and wear data, collects and processes dynamic data in real time, and transforms complex operating conditions into a unified evaluation metric, enabling more refined lifespan prediction. This approach, combined with technologies like the Internet of Vehicles and cloud diagnostics in a data-driven environment, has great potential for application and widespread adoption.

[0132] like Figure 4 and Figure 5 As shown, the implementation of the above solution specifically includes the following steps:

[0133] Step 1: Data collection and experimental modeling.

[0134] Obtain friction material test data: Use the Tt spectrum of friction materials at different temperatures obtained in the laboratory, such as Figure 3 As shown, T is the working temperature of the friction material and t is the working time at this temperature, so as to determine the influence of temperature on wear rate and life.

[0135] Online data collection: Vehicle-mounted sensors are used to monitor the clutch's operating temperature and accumulated operating hours in real time, providing dynamic input for subsequent data conversion.

[0136] Step 2: Calculation of equivalent sliding friction time integral.

[0137] Reference temperature conversion: Select a commonly used temperature as the standard reference temperature, integrate the sliding friction time at different temperatures in actual working conditions, and convert it into equivalent sliding friction time to facilitate unified processing of data under different working conditions.

[0138] Step 3: Model construction and simulation verification.

[0139] Temperature determination module: A dedicated module is designed to determine the clutch's temperature range in real time and dynamically select the corresponding conversion parameters. The actual temperature data collected onboard is processed in segments and the equivalent slip time is calculated based on different temperature conditions.

[0140] Hardware parameter module: Based on hardware parameter principles and experimental data, hardware parameters based on product characteristics are formed to construct a regression equation. 150°C is selected as the reference temperature, and the segmented regression equation for the relationship between T and t is obtained as shown in the above formula (2).

[0141] Operation and regression module: uses numerical integration algorithm and regression analysis method to build a life calculation simulation model and map the actual working condition data into the health attenuation curve of the clutch friction plate.

[0142] Step 4: Health assessment and simulation verification.

[0143] Health status curve: Based on the simulation model output, a health attenuation curve of the clutch friction plate under different temperature conditions is formed, providing users with an intuitive health status display.

[0144] Model Validation: Comparing simulation curves with life maps obtained from hardware testing ensures the model accurately reflects actual usage under various operating conditions. Simulation experiments confirm that the curves obtained from the simulations match the hardware life maps, demonstrating the model's effectiveness and predictive accuracy.

[0145] Step 5: System integration and application promotion.

[0146] On-Board Diagnostic System Integration: Integrating the simulation model into the on-board diagnostic system enables real-time monitoring of clutch health status, and data sharing and remote maintenance warnings are implemented through a cloud platform. By embedding this method into the vehicle control system and cloud platform, online monitoring and warning of clutch health status are achieved.

[0147] Maintenance and after-sales support: Through accurate prediction of clutch life, we can provide users with precise maintenance suggestions and vehicle usage recommendations, and also provide manufacturers with a scientific basis for problem troubleshooting, thereby reducing safety risks and after-sales costs caused by component failure.

[0148] The advantages of the above solution are:

[0149] Data-driven dynamic assessment: Unlike traditional static and simple condition assessment methods, this approach uses real-time data and digital simulation models to achieve quantifiable dynamic predictions of clutch life.

[0150] Conversion of multiple temperature conditions: Through the equivalent sliding friction time integral method, the complex and changeable temperature conditions are converted into a unified evaluation index to improve the accuracy of the prediction.

[0151] The integrated application prospect is broad: this method can be seamlessly embedded in the Internet of Vehicles and cloud diagnostic systems, providing strong technical support for vehicle health management and after-sales services.

[0152] This embodiment also provides a clutch life assessment device for implementing the aforementioned embodiments and preferred implementations. Details already described will not be repeated. As used below, the term "module" may refer to a combination of software and / or hardware that implements a predetermined function. While the devices described in the following embodiments are preferably implemented using software, implementation using hardware, or a combination of software and hardware, is also possible and contemplated.

[0153] The embodiment of the present invention provides a clutch life evaluation device, such as Figure 6 As shown, the device includes:

[0154] An acquisition module 601 is used to obtain the working time of the friction material corresponding to the target clutch to reach a set wear amount at different working temperatures, and to establish a relationship curve between the working temperature and the working time;

[0155] The first processing module 602 is configured to determine a reference temperature and perform piecewise fitting on the relationship curve based on the reference temperature to obtain a piecewise regression equation of the operating temperature and the working time.

[0156] The second processing module 603 is used to construct a clutch life evaluation model based on a piecewise regression equation with the clutch operating time and operating temperature as variables;

[0157] The third processing module 604 is used to obtain the actual operating temperature of the target clutch corresponding to different sampling moments within the current operating time, and input the current operating time and the actual operating temperature corresponding to different sampling moments into the clutch life assessment model to obtain the life assessment result of the target clutch.

[0158] In some optional implementations, the acquisition module 601 includes:

[0159] The first processing unit is used to control the friction material to perform multiple wear tests at each operating temperature under laboratory conditions, and record the first time required for the friction material to reach a set wear amount in each test;

[0160] The second processing unit is configured to determine a corresponding working time of the friction material at the current working temperature based on the first time corresponding to the multiple tests at the current working temperature.

[0161] In some optional implementations, the first processing module 602 includes:

[0162] a third processing unit, configured to obtain historical operating temperature data of a target clutch;

[0163] The fourth processing unit is configured to determine at least one first temperature with the longest operating time in the historical operating temperature data as a reference temperature.

[0164] When the target clutch is a wet clutch, in some alternative embodiments, the first processing module 702 includes:

[0165] a fifth processing unit, configured to obtain at least one critical temperature corresponding to a change in a state of an oil film formed on a friction plate surface of a target clutch;

[0166] The sixth processing unit is configured to determine the critical temperature as the reference temperature.

[0167] In some optional embodiments, the piecewise regression equation is as follows:

[0168]

[0169] Wherein, T represents the current operating temperature of the clutch, T0 represents the reference temperature, t0 represents the working time, k1 and k2 represent the regression equation coefficients, and b1 and b2 are the constant terms of the regression equation.

[0170] In some optional embodiments, the life assessment result includes: the current remaining life percentage of the clutch, and the clutch life assessment model is as follows:

[0171]

[0172] Where H is the current remaining life percentage of the clutch, T1 is the current operating time of the clutch, t is the sampling time in the vehicle controller, a is the design safety factor, and a ≥ 1, k is the regression equation coefficient corresponding to the operating temperature of the clutch at the current sampling time, and b is the regression equation constant corresponding to the operating temperature of the clutch at the current sampling time.

[0173] In some optional embodiments, the life assessment result further includes: the remaining working time of the clutch at the reference temperature. The clutch life assessment device provided by the embodiment of the present invention further includes:

[0174] a seventh processing unit, configured to obtain a current operating temperature of the target clutch;

[0175] An eighth processing unit, configured to calculate a target operating time corresponding to the current operating temperature based on a piecewise regression equation;

[0176] a ninth processing unit, configured to calculate a remaining operable time of the target clutch based on the target operable time and the current remaining life percentage;

[0177] The tenth processing unit is configured to convert the remaining operable time into the remaining operable time at a reference temperature.

[0178] In some optional implementations, the tenth processing unit includes:

[0179] The first calculation subunit is used to calculate the ratio of the working time corresponding to the reference temperature to the target working time;

[0180] The second calculation subunit is used to calculate the product of the remaining working time and the ratio to obtain the remaining working time at the reference temperature.

[0181] In some optional embodiments, the clutch life assessment device further includes:

[0182] A fourth processing module is configured to upload the life assessment result to the cloud, so that the cloud performs a health assessment on the target clutch based on the life assessment result, and transmits the assessed health information to a user terminal corresponding to the vehicle where the target clutch is located;

[0183] And / or, a fifth processing module is used to upload the life assessment result to the cloud, so that the cloud generates driving suggestions and / or maintenance suggestions based on the life assessment result, and sends the driving suggestions and / or maintenance suggestions to the user end.

[0184] The further functional description of each of the above modules and units is the same as that of the above corresponding method embodiments and will not be repeated here.

[0185] The embodiment of the present invention further provides a vehicle, the vehicle including a clutch, the vehicle also including a controller, such as Figure 7 As shown, the controller includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components utilize different buses to communicate with each other and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the computer device, including instructions stored in or on the memory to display graphical information of a GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 7 A processor 10 is taken as an example.

[0186] The processor 10 may be a central processing unit, a network processor, or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic, or any combination thereof.

[0187] The memory 20 stores instructions that can be executed by at least one processor 10, so as to enable at least one processor 10 to execute the method shown in the above embodiment.

[0188] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created based on the use of a computer device for displaying a small program landing page, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0189] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0190] The controller further includes a communication interface 30 for the vehicle to communicate with other devices or a communication network.

[0191] The embodiment of the present invention also provides a computer-readable storage medium. The above-mentioned method according to the embodiment of the present invention can be implemented in hardware, firmware, or implemented as a computer code that can be recorded in a storage medium, or implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and downloaded through a network and will be stored in a local storage medium, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state drive, etc.; further, the storage medium can also include a combination of the above-mentioned types of memory. It can be understood that a computer, a processor, a microprocessor controller or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor or hardware, the method shown in the above embodiment is implemented.

[0192] A portion of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the form in which the computer program instruction exists in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc. Accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium that can be accessed by the computer.

[0193] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A clutch life assessment method, characterized in that: The method comprises: Obtain the working time of the friction material corresponding to the target clutch to reach the set wear amount at different working temperatures, and establish a relationship curve between working temperature and working time; Determine a reference temperature, and perform a segmented regression analysis on the relationship curve based on the reference temperature to obtain a segmented regression equation of the operating temperature and the working time; Based on the segmented regression equation, a clutch life evaluation model is constructed with clutch operating time and operating temperature as variables; The actual operating temperature of the target clutch corresponding to different sampling times within the current operating time is obtained, and the current operating time and the actual operating temperature corresponding to different sampling times are input into the clutch life assessment model to obtain the life assessment result of the target clutch.

2. The method according to claim 1, characterized in that The method of obtaining the working time of the friction material corresponding to the target clutch to reach the set wear amount at different working temperatures includes: Under laboratory conditions, the friction material is controlled to conduct multiple wear tests at each operating temperature, and the first time required for the friction material to reach the set wear amount in each test is recorded; Based on the first times corresponding to the multiple tests at the current working temperature, the working time corresponding to the friction material at the current working temperature is determined.

3. The method according to claim 1, characterized in that Determining the reference temperature includes: Obtain historical operating temperature data of the target clutch; At least one first temperature with the longest operating time in the historical operating temperature data is determined as a reference temperature.

4. The method according to claim 1, wherein When the target clutch is a wet clutch, determining the reference temperature includes: Obtaining at least one critical temperature corresponding to a change in the state of an oil film formed on a friction plate surface of a target clutch; The critical temperature is determined as the reference temperature.

5. The method according to claim 1, wherein The piecewise regression equation is as follows: Wherein, T represents the current operating temperature of the clutch, T0 represents the reference temperature, t0 represents the working time, k1 and k2 represent the regression equation coefficients, and b1 and b2 are the constant terms of the regression equation.

6. The method according to claim 5, characterized in that The life evaluation result includes: the current remaining life percentage of the clutch. The clutch life evaluation model is as follows: Where H is the current remaining life percentage of the clutch, T1 is the current operating time of the clutch, t is the sampling time in the vehicle controller, a is the design safety factor, and a ≥ 1, k is the regression equation coefficient corresponding to the operating temperature of the clutch at the current sampling time, and b is the regression equation constant corresponding to the operating temperature of the clutch at the current sampling time.

7. The method according to claim 6, characterized in that The life evaluation result further includes: the remaining working time of the clutch at the reference temperature. The method further includes: Acquiring the current operating temperature of the target clutch; Calculating the target working time corresponding to the current working temperature based on the piecewise regression equation; Calculating the remaining operable time of the target clutch based on the target operable time and the current remaining life percentage; The remaining working time is converted into the remaining working time at the reference temperature.

8. The method according to claim 7, characterized in that The converting the remaining working time into the remaining working time at the reference temperature includes: Calculating a ratio of the operating time corresponding to the reference temperature to the target operating time; The product of the remaining working time and the ratio is calculated to obtain the remaining working time at the reference temperature.

9. The method according to any one of claims 1 to 8, characterized in that The method further comprises: Uploading the life assessment result to the cloud, so that the cloud performs a health assessment on the target clutch based on the life assessment result, and sends the assessed health information to the user terminal corresponding to the vehicle where the target clutch is located; And / or, uploading the life assessment result to the cloud, so that the cloud generates driving suggestions and / or maintenance suggestions based on the life assessment result, and sends the driving suggestions and / or maintenance suggestions to the user terminal.

10. A clutch life evaluation device, characterized in that: The device comprises: An acquisition module is used to obtain the working time of the friction material corresponding to the target clutch to reach a set wear amount at different working temperatures, and to establish a relationship curve between the working temperature and the working time; A first processing module is configured to determine a reference temperature, and perform piecewise fitting on the relationship curve based on the reference temperature to obtain a piecewise regression equation of the operating temperature and the working time; A second processing module is used to construct a clutch life evaluation model with clutch operating time and operating temperature as variables based on the piecewise regression equation; The third processing module is used to obtain the actual working temperature of the target clutch corresponding to different sampling moments within the current working time, and input the current working time and the actual working temperature corresponding to different sampling moments into the clutch life assessment model to obtain the life assessment result of the target clutch.

11. A vehicle comprising a clutch, characterized in that: The vehicle further includes a controller, the controller including: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method according to any one of claims 1 to 9 by executing the computer instructions.

12. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the method according to any one of claims 1 to 9.

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