A clutch performance testing method

Abstract

The present invention relates to the field of clutch technology, and in particular to a clutch performance testing method, which collects first height data of the clutch pedal when it is started to be stepped on, second height data of the clutch pedal when it is fully stepped on, pressure data, and a wear image of a clutch plate after the clutch pedal is stepped on several times; determines several pedal overruns and pedal stroke consistency characteristic values ​​according to the detected height data, and determines a correlation coefficient according to several pedal overruns and pressure data; extracts the wear characteristics of the clutch according to the wear image, and determines the degree of wear of the clutch plate according to the wear characteristics; determines a confirmation method of the clutch slip rate according to the correlation coefficient, and determines the clutch slip rate according to the confirmation method, the pedal stroke consistency characteristic value, the correlation coefficient, and the degree of wear. The present invention effectively tests the clutch slip rate and slip performance.

Description

Technical Field

[0001] The present invention relates to the technical field of clutches, and in particular to a clutch performance testing method. Background Art

[0002] The clutch is a key component in the vehicle transmission system, responsible for connecting and disconnecting the power transmission between the engine and the transmission. The performance of the clutch directly affects the vehicle's starting, shifting, climbing and other driving performance. Through the clutch performance test, its various performance indicators can be comprehensively evaluated, potential problems of the clutch can be discovered in time, which helps to optimize the design and manufacturing process of the clutch and improve reliability and durability.

[0003] Chinese Patent Publication No.: CN115493838A, an automobile clutch performance test device and a test method thereof, comprising a support seat, a first bearing seat is fixedly arranged on the rear side of the upper surface of the support seat, a second bearing seat is fixedly arranged on the front side of the upper surface of the support seat, connecting sleeves are installed inside the first bearing seat and the second bearing seat, a clutch body is installed between the connecting sleeve and the adjacent connecting sleeve, a clutch pedal is installed on the clutch body, the left and right sides of the upper surface of the support seat are fixedly connected with the connecting seat, a fixing frame is fixedly arranged on the surface of the connecting seat, a contour adjustment component is installed inside the fixing frame, a moving track adjustment component is installed between the fixing frame and the adjacent fixing frame, and the connecting seat is connected to the clutch pedal through a pedal docking component.

[0004] It can be seen that although the above technical solution can simulate the performance of the clutch under different pedaling conditions, detect the degree of clutch synchronization, and detect whether the clutch is slipping, it has the following problems: it does not consider the influence of clutch pedal height, clutch friction loss, and power loss on clutch slipping. Summary of the invention

[0005] To this end, the present invention provides a clutch performance testing method to overcome the problem in the prior art that the influence of clutch pedal height, clutch friction loss, and power loss on clutch slippage is not considered.

[0006] To achieve the above object, the present invention provides a clutch performance testing method, comprising: Applying a color developing coating of a set thickness or applying a wear material of a set thickness on the working surface of the clutch plate, and collecting pressure data of a plurality of pressure sensors arranged in an array on the working surface of the clutch plate; During the process of stepping on the clutch several times, first height data of the pedal when the clutch is started to be stepped on, second height data of the pedal when the clutch is fully stepped on, the pressure data, and a wear image of the clutch plate after the clutch is stepped on several times are collected; Determine a number of pedal overruns according to a preset height data range, the first height data, and the second height data, determine a pedal stroke consistency characteristic value according to the pedal overruns, and determine a correlation coefficient according to the number of pedal overruns and pressure data; extracting the wear characteristics of the clutch according to the wear image, and determining the wear degree of the clutch plate according to the wear characteristics; A method for confirming the clutch slip rate is determined according to the correlation coefficient and a threshold value of the rate of change of the correlation coefficient, and the clutch slip rate is determined according to the confirmation method, a pedal stroke consistency characteristic value, the correlation coefficient and the degree of wear.

[0007] Furthermore, a distance fluctuation value of the pedal over-travel is determined based on several pedal over-travels, a distance fluctuation degree is determined based on the distance fluctuation value, and a pedal stroke consistency characteristic value is determined based on the distance fluctuation degree and a distance fluctuation threshold.

[0008] Further, determining the degree of wear of the clutch plate includes: Obtain the clutch plate area and clutch plate thickness before the test; Extracting a clutch wear feature image according to the wear image; Determine the wear area and wear depth based on the wear feature image; The degree of wear is determined based on the wear area and the wear depth.

[0009] Further, the wear area and the wear depth are determined based on the wear characteristic image, including: The wear area is determined based on the color missing area in the wear feature image, and the wear depth is determined based on the clutch plate loss thickness in the wear feature image.

[0010] Furthermore, the correlation coefficient between the pedaling stroke and the pressure data during a single pedaling is determined based on the single pedal overrun stroke and pressure data, and the correlation coefficient change rate is determined based on the correlation coefficients of a number of adjacent two pedalings.

[0011] Furthermore, the method for determining the clutch slip rate includes: If the correlation coefficient change rate is greater than or equal to the change rate threshold, the confirmation method is to determine the clutch slip rate based on the pedal stroke consistency characteristic value, the correlation coefficient of the pedal over-travel and pressure data, and the wear degree.

[0012] Furthermore, the method for determining the clutch slip rate also includes: If the correlation coefficient change rate is less than the change rate threshold, the confirmation method is to determine the slip rate according to the pedal stroke consistency characteristic value and the wear degree.

[0013] Furthermore, the method further includes collecting the vehicle speed and the engine speed during several gear shifting or acceleration processes, determining a first climbing rate according to the vehicle speed, and determining a second climbing rate according to the engine speed.

[0014] Further, the power loss amount is determined according to the vehicle speed and the engine speed, and the climbing rate proportional relationship between the vehicle speed and the engine speed is determined according to the first climbing rate and the second climbing rate.

[0015] Furthermore, the slip rate of the clutch is determined according to the proportional relationship among the pedal stroke consistency characteristic value, the degree of wear, the amount of power loss and the climbing rate.

[0016] Compared with the prior art, the beneficial effect of the present invention is that the present invention determines the pedal overrun according to the first height and the second height of the clutch pedal during several steps of the clutch pedal, and judges the pedal stroke consistency characteristic value. At the same time, the correlation coefficient is determined according to several pedal overruns and pressure data; the degree of wear of the clutch plate is determined according to the wear image; and then the confirmation method of the clutch slip rate is jointly determined according to the pedal stroke consistency characteristic value, the correlation coefficient and the degree of wear, and the clutch slip is calculated. The present invention effectively detects whether the clutch is slipping, and effectively obtains the clutch slip rate, which helps to further understand the performance of the clutch and adjust the clutch.

[0017] Furthermore, the present invention determines the distance fluctuation value of the pedal overrun according to several pedal overruns, determines the distance fluctuation degree according to the distance fluctuation value, and determines the pedal stroke consistency characteristic value according to the distance fluctuation degree and the distance fluctuation threshold. This further effectively detects whether the clutch is slipping, and effectively obtains the clutch slip rate, which helps to further understand the clutch performance and adjust the clutch.

[0018] Furthermore, the present invention obtains the clutch plate area and clutch plate thickness before the test, extracts the clutch wear characteristic image according to the wear image, determines the wear area and wear depth based on the wear characteristic image, and determines the wear degree according to the wear area and the wear depth. This further effectively detects whether the clutch is slipping, and effectively obtains the clutch slip rate, which helps to further understand the clutch performance and adjust the clutch.

[0019] Furthermore, the present invention determines the correlation coefficient of the pedaling stroke and pressure data during a single pedaling based on the single pedal over-limit stroke and pressure data, determines the correlation coefficient change rate based on the correlation coefficient, and then determines the confirmation method of the clutch slip rate, thereby further effectively deriving the clutch slip rate, which helps to further understand the clutch performance status and adjust the clutch.

[0020] Furthermore, the present invention determines the amount of power loss based on the vehicle speed and the engine speed, and also determines the proportional relationship between the climbing rates of the vehicle speed and the engine speed based on the first climbing rate and the second climbing rate, thereby further effectively detecting whether the clutch is slipping and effectively obtaining the clutch slip rate, which helps to further understand the performance status of the clutch and adjust the clutch. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A flow chart of a clutch performance testing method according to an embodiment of the present invention; Figure 2 A flow chart for determining a pedal stroke consistency characteristic value according to an embodiment of the present invention; Figure 3 A flow chart for determining the degree of wear according to an embodiment of the present invention; Figure 4 The flowchart is a method for determining the clutch slip ratio according to an embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0024] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0025] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] See also Figure 1As shown, it is a flow chart of a clutch performance testing method of the present invention. Specifically, the present invention provides a clutch performance testing method, comprising: Step S1, applying a color developing coating of a set thickness or applying a wear material of a set thickness on the working surface of the clutch plate, and collecting pressure data of a plurality of pressure sensors arranged in an array on the working surface of the clutch plate; Step S2, during the process of stepping on the clutch several times, collecting the first height data of the pedal when the clutch is started to be stepped on, the second height data of the pedal when the clutch is fully stepped on, the pressure data, and the wear image of the clutch plate after the clutch is stepped on several times; Step S3, determining a number of pedal over-limit strokes according to a preset height data range and the first height data and the second height data, determining a pedal stroke consistency characteristic value according to the pedal over-limit stroke, and determining a correlation coefficient according to the number of pedal over-limit strokes and pressure data; Step S4, extracting the wear characteristics of the clutch according to the wear image, and determining the wear degree of the clutch plate according to the wear characteristics; Step S5, determining a confirmation method for the clutch slip rate according to the correlation coefficient and a threshold value of the rate of change of the correlation coefficient, and determining the clutch slip rate according to the confirmation method, a pedal stroke consistency characteristic value, the correlation coefficient and the degree of wear.

[0027] It can be understood that the first height data is the vertical height data of the clutch pedal relative to the bottom plane of the vehicle when the clutch pedal is not stepped on, and the second height data is the vertical height data of the clutch pedal relative to the bottom plane of the vehicle after the clutch pedal is fully stepped on. The pedal over-limit stroke is the difference between the first height data and the second height data after a single stepping action is completed and the difference between the preset height data range.

[0028] In a specific embodiment, a color coating of a set thickness is applied to the working surface of the clutch plate, and a coating with high adhesion (such as copper powder metal coating) can be selected as the color coating, and this coating gradually wears away during the friction of the clutch plate. Alternatively, a wear material (such as hard alloy) of a set thickness is applied to the working surface, and the wear material gradually wears away during the friction of the clutch plate. The set thickness, the coating, and the wear material can be selected according to actual conditions, and are not specifically limited here and will not be repeated.

[0029] In a specific embodiment, during the process of stepping on the clutch pedal several times, the statistical number of times the clutch pedal is stepped on can be determined according to actual conditions, and is not specifically limited here. The preset height data range can be the absolute value of the difference between the second height data of the clutch pedal when the clutch pedal is stepped on when the clutch is not slipping and the first height data of the clutch pedal in the initial state. The value range and preferred value of the preset height data range are not specifically limited here and will not be repeated.

[0030] The present invention determines the pedal overrun according to the first height and the second height of the clutch pedal during several times of stepping on the clutch pedal, and judges the pedal stroke consistency characteristic value. At the same time, the correlation coefficient is determined according to the several times of pedal overrun and pressure data; the degree of wear of the clutch plate is determined according to the wear image; and then the confirmation method of the clutch slip rate is jointly determined according to the pedal stroke consistency characteristic value, the correlation coefficient and the degree of wear, and the clutch slip is calculated. The present invention effectively detects whether the clutch is slipping, and effectively obtains the clutch slip rate, which helps to further understand the performance of the clutch and adjust the clutch.

[0031] See also Figure 2 , which is a flow chart of determining the pedal stroke consistency characteristic value of the present invention; specifically, it includes: Step S31, determining a distance fluctuation value of the pedal over-limit stroke according to a number of pedal over-limit strokes; Step S32, determining the distance fluctuation degree according to the distance fluctuation value; Step S33: determining a pedal stroke consistency characteristic value according to the distance fluctuation degree and the distance fluctuation threshold.

[0032] It is understandable that after the clutch pedal is stepped on several times, due to the influence of various factors such as friction loss, the pedal over-travel will be inconsistent, and the pedal stroke consistency characteristic value can further reflect the clutch slip performance.

[0033] In a specific embodiment, the distance fluctuation value is the difference between adjacent pedal over-limit strokes. The distance fluctuation degree can be determined based on several distance fluctuation values. The distance fluctuation degree is the mean / median of several distance fluctuation values. The distance fluctuation threshold value is the mean of the m-1 distance fluctuation values ​​when the clutch plate is stepped on for the first m times. The first m times are the first 10% to 20% of the number of times the clutch plate is stepped on. The distance fluctuation degree is compared with the distance fluctuation threshold. If the distance fluctuation degree is greater than the distance fluctuation threshold, it means that the pedal over-limit stroke is inconsistent. The pedal stroke consistency characteristic value is determined based on the distance fluctuation degree and the distance fluctuation threshold. The pedal stroke consistency characteristic value is the absolute value of the difference between 1 and the ratio of the distance fluctuation degree to the distance fluctuation threshold. In implementation, the distance fluctuation degree, the pedal stroke consistency characteristic value, and the distance fluctuation threshold can be determined according to actual conditions. No specific limitation is made here, and no further description is given.

[0034] The present invention determines the distance fluctuation value of the pedal overrun according to a number of pedal overruns, determines the distance fluctuation degree according to the distance fluctuation value, and determines the pedal stroke consistency characteristic value according to the distance fluctuation degree and the distance fluctuation threshold. This further effectively detects whether the clutch is slipping, and effectively obtains the clutch slip rate, which helps to further understand the clutch performance and adjust the clutch.

[0035] See also Figure 3 As shown, it is a flow chart of determining the degree of wear of the present invention. Specifically, determining the degree of wear of the clutch plate includes: Step S41, obtaining the clutch plate area and clutch plate thickness before the test; Step S42, extracting a clutch wear characteristic image according to the wear image; Step S43, determining the wear area and wear depth based on the wear feature image; Step S44: determining the degree of wear according to the wear area and the wear depth.

[0036] Specifically, the wear area and wear depth are determined based on the wear feature image, including: The wear area is determined based on the color missing area in the wear feature image, and the wear depth is determined based on the clutch plate loss thickness in the wear feature image.

[0037] It is understandable that if the clutch is worn, the clutch plate will become thinner, reducing the contact area between the clutch plate and the flywheel or pressure plate, thereby reducing the clutch's ability to transmit torque. When worn to a certain extent, the clutch may slip when transmitting a larger torque, so the degree of clutch wear is included in the slip performance test.

[0038] In a specific embodiment, wear images of the clutch in different directions can be collected, and the wear characteristic image of the clutch can be extracted based on the wear image. The wear area is determined by the color missing area in the wear characteristic image, and the color missing area is the absolute value of the difference between the clutch plate area before the test and the clutch plate area after the test. The wear depth is determined based on the clutch plate loss thickness in the wear characteristic image, and the clutch plate loss thickness is the absolute value of the difference between the clutch plate thickness before the test and the clutch plate thickness after the test.

[0039] The degree of wear is the product of the ratio of the wear depth to the thickness of the clutch plate before the test and the ratio of the wear area to the area of ​​the clutch plate before the test. In implementation, the acquisition range of the wear image, the wear area, and the determination method of the wear depth can be determined according to actual conditions, and are not specifically limited here. As long as the wear area and wear depth can be determined through the wear image, the degree of wear can be determined based on the wear area and wear depth, and no further details will be given here.

[0040] The present invention obtains the clutch plate area and clutch plate thickness before the test, extracts the clutch wear characteristic image according to the wear image, determines the wear area and wear depth based on the wear characteristic image, and determines the wear degree according to the wear area and the wear depth. This further effectively detects whether the clutch is slipping, and effectively obtains the clutch slip rate, which helps to further understand the clutch performance and adjust the clutch.

[0041] See also Figure 4 As shown, it is a flow chart of the method for determining the clutch slip rate of the present invention; specifically, it includes: Step S51, determining the correlation coefficient between the pedaling stroke and the pressure data during a single pedaling according to the single pedaling overrun stroke and pressure data; Step S52, determining a correlation coefficient change rate according to a plurality of correlation coefficients; Step S53, determining a method for confirming the clutch slip rate according to a comparison result between the correlation coefficient change rate and the change rate threshold.

[0042] It is understandable that there is a certain connection between the pedal stroke and the pressure data of the clutch plate working surface when the clutch pedal is stepped on. In a specific embodiment, the correlation coefficient of the pedal stroke and the pressure data during a single pedaling can be determined based on the Pearson correlation coefficient formula, several pedal strokes, and several pressure data. The correlation coefficient change rate can be calculated based on the correlation coefficients of two adjacent pedalings. The i-th correlation coefficient change rate is the ratio of the difference between the i+1th correlation coefficient and the i-th correlation coefficient to the i-th correlation coefficient. The method for determining the correlation coefficient and the correlation coefficient change rate can be determined according to the actual situation, which is not specifically limited here and will not be repeated.

[0043] Specifically, the methods for confirming the clutch slip rate include: If the correlation coefficient change rate is greater than or equal to the change rate threshold, the confirmation method is to jointly determine the clutch slip rate based on the pedal stroke consistency characteristic value, the correlation coefficient of the pedal over-travel and pressure data, and the wear degree.

[0044] It is understandable that if the correlation coefficient change rate is greater than or equal to the change rate threshold, it proves that the correlation coefficient has an effect on the clutch slip, so the correlation coefficient is considered when determining the clutch slip rate. If the correlation coefficient change rate is less than the change rate threshold, it proves that the correlation coefficient has little effect on the clutch slip, so the correlation coefficient is not considered.

[0045] In a specific embodiment, the higher the pedal stroke consistency characteristic value, the lower the slip rate, so the pedal stroke consistency characteristic value is inversely proportional to the slip rate, the closer the first difference between the correlation coefficient of the pedal overrun stroke and pressure data and 1 is to 1, the closer the relationship between the two is, the lower the slip rate, the first difference is proportional to the slip rate, and the wear degree is proportional to the slip rate. Therefore, the slip rate is the ratio of the product of the first difference and the wear degree to the pedal stroke consistency characteristic value.

[0046] In implementation, if the rate of change of the correlation coefficient is greater than or equal to the rate of change threshold, the slip rate is not specifically limited here. As long as the pedal stroke consistency characteristic value is inversely proportional to the slip rate, the first difference is proportional to the slip rate, and the degree of wear is proportional to the slip rate, it will not be elaborated here.

[0047] Specifically, the clutch confirmation method also includes: If the correlation coefficient change rate is less than the change rate threshold, the confirmation method is to jointly determine the slip rate based on the pedal stroke consistency characteristic value and the wear degree.

[0048] In a specific embodiment, the higher the pedal stroke consistency characteristic value, the lower the slip rate, so the pedal stroke consistency characteristic value is inversely proportional to the slip rate, and the wear degree is proportional to the slip rate. Therefore, the slip rate is the ratio of the wear degree to the pedal stroke consistency characteristic value.

[0049] In implementation, if the change rate of the correlation coefficient is less than the change rate threshold, the slip rate is not specifically limited here. As long as the pedal stroke consistency characteristic value is inversely proportional to the slip rate and the wear degree is proportional to the slip rate, it will not be elaborated here.

[0050] The present invention determines the correlation coefficient of the pedaling stroke and pressure data during a single pedaling according to the single pedal over-limit stroke and pressure data, determines the correlation coefficient change rate according to the correlation coefficient, and then determines the confirmation method of the clutch slip rate, thereby further effectively obtaining the clutch slip rate, which helps to further understand the clutch performance status and adjust the clutch.

[0051] Specifically, the present invention also includes, during several gear shifting or acceleration processes, collecting vehicle speed and engine speed, determining a first climbing rate according to the vehicle speed, and determining a second climbing rate according to the engine speed.

[0052] It is understandable that when the clutch slips, if the engine speed increases, the vehicle speed may not increase accordingly or increase very slowly. At the same time, clutch slippage will also cause the power output of the engine to be unable to be effectively transmitted to the wheels, resulting in power loss. Therefore, the vehicle speed and engine speed are collected, and the first climbing rate and the second climbing rate are determined.

[0053] Specifically, a first climbing stage is determined according to the vehicle speed, a first climbing rate is determined according to the first climbing stage, a second climbing stage is determined according to the engine speed, and a second climbing rate is determined according to the second climbing stage.

[0054] In a specific embodiment, during a single gear shifting / acceleration process, a stage with obvious acceleration, that is, a first climbing stage (the time it takes for the vehicle to reach a certain stable speed from a low speed or enter the next gear shifting point) can be identified based on a curve of changes in vehicle speed, and the starting point and the ending point of the first climbing stage are determined. The duration of the first climbing stage is determined based on the starting point and the ending point, as well as the corresponding vehicle speed at the starting point and the vehicle speed at the ending point. A speed increment is determined based on the vehicle speed at the starting point and the vehicle speed at the ending point, and the first climbing rate is the ratio of the speed increment to the duration of the first climbing stage.

[0055] In a specific embodiment, during a single gear shifting / acceleration process, the stage of obvious acceleration, that is, the second climbing stage (the time it takes for the engine to reach a certain stable speed from a low speed or enter the next gear shift point) can be identified based on the change curve of the engine speed, and the starting point and the ending point of the second climbing stage are determined. The duration of the second climbing stage is determined based on the starting point and the ending point, as well as the corresponding engine speed at the starting point and the engine speed at the ending point. The speed increment is determined based on the engine speed at the starting point and the engine speed at the ending point, and the second climbing rate is the ratio of the speed increment to the duration of the second climbing stage.

[0056] In implementation, the method for determining the first climbing rate and the second climbing rate may be determined according to actual conditions, which is not specifically limited or elaborated herein.

[0057] Specifically, the power loss amount is determined according to the vehicle speed and the engine speed, and the climbing rate proportional relationship between the vehicle speed and the engine speed is determined according to the first climbing rate and the second climbing rate.

[0058] It can be understood that, under normal circumstances, there is a positive correlation between the engine speed and the vehicle speed. As the engine speed increases, the vehicle speed increases, the clutch works normally, and the power transmission is effective. Therefore, by determining the proportional relationship between the climbing rate of the vehicle speed and the engine speed, the clutch slip performance can be further determined.

[0059] In a specific embodiment, the wheel output power is determined according to the vehicle speed, the engine output power is determined according to the engine speed, and the power loss amount is the difference between the engine output power and the wheel output power. If the second climbing rate is greater than the first climbing rate, and the difference between the second climbing rate and the first climbing rate exceeds the preset difference, then the climbing rate ratio relationship between the vehicle speed and the engine speed is determined to be negatively correlated or weakly positively correlated. The preset difference may be the difference between the ideal engine speed and the corresponding ideal vehicle speed when the clutch is normal and not worn. In implementation, the power loss amount, the range of values ​​of the preset difference and the preferred value are not specifically limited here and will not be repeated.

[0060] Specifically, the clutch slip rate is determined based on the pedal stroke consistency characteristic value, wear degree, power loss and climbing rate proportional relationship.

[0061] In a specific embodiment, the higher the pedal stroke consistency characteristic value, the lower the slip rate, so the pedal stroke consistency characteristic value is inversely proportional to the slip rate, the degree of wear is directly proportional to the slip rate, and the power loss is directly proportional to the slip rate, so the slip rate is the ratio of the product of the degree of wear and the power loss to the product of the pedal stroke consistency characteristic value and the preset power loss. The preset power loss is the difference between the ideal output power of the engine and the ideal output power of the wheel when the engine and the wheel are transmitting power under ideal conditions.

[0062] In implementation, the clutch slip rate and preset power loss are not specifically limited here. As long as they can be calculated through the pedal stroke consistency characteristic value, wear degree and power loss amount under the condition that the climbing proportion relationship is negatively correlated or weakly positively correlated, and the pedal stroke consistency characteristic value is inversely proportional to the slip rate, the wear degree is proportional to the slip rate, and the power loss amount is proportional to the slip rate, it will be sufficient. No further details will be given here.

[0063] The present invention determines the amount of power loss based on the vehicle speed and the engine speed, and also determines the proportional relationship between the vehicle speed and the engine speed based on the first climbing rate and the second climbing rate, thereby further effectively detecting whether the clutch is slipping, and effectively obtaining the clutch slip rate, which helps to further understand the performance status of the clutch and adjust the clutch.

[0064] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A clutch performance testing method, characterized in that: include: Applying a color developing coating of a set thickness or applying a wear material of a set thickness on the working surface of the clutch plate, and collecting pressure data of a plurality of pressure sensors arranged in an array on the working surface of the clutch plate; During the process of stepping on the clutch several times, first height data of the pedal when the clutch is started to be stepped on, second height data of the pedal when the clutch is fully stepped on, the pressure data, and a wear image of the clutch plate after the clutch is stepped on several times are collected; Determine a number of pedal overruns according to a preset height data range, the first height data, and the second height data, determine a pedal stroke consistency characteristic value according to the pedal overruns, and determine a correlation coefficient according to the number of pedal overruns and pressure data; extracting the wear characteristics of the clutch according to the wear image, and determining the wear degree of the clutch plate according to the wear characteristics; A method for confirming the clutch slip rate is determined according to the correlation coefficient and a threshold value of the rate of change of the correlation coefficient, and the clutch slip rate is determined according to the confirmation method, a pedal stroke consistency characteristic value, the correlation coefficient and the degree of wear.

2. The clutch performance testing method according to claim 1, characterized in that: A distance fluctuation value of the pedal over-limit stroke is determined according to several pedal over-limit strokes, a distance fluctuation degree is determined according to the distance fluctuation value, and a pedal stroke consistency characteristic value is determined according to the distance fluctuation degree and a distance fluctuation threshold.

3. The clutch performance testing method according to claim 2, characterized in that: Determining the degree of clutch plate wear includes: Get the clutch plate area and clutch plate thickness before the test; Extracting a clutch wear feature image according to the wear image; Determine the wear area and wear depth based on the wear feature image; The degree of wear is determined based on the wear area and the wear depth.

4. The clutch performance testing method according to claim 3, characterized in that: Determine the wear area and wear depth based on the wear feature image, including: The wear area is determined based on the color missing area in the wear feature image, and the wear depth is determined based on the clutch plate loss thickness in the wear feature image.

5. The clutch performance testing method according to claim 4, characterized in that: The correlation coefficient of the pedaling stroke and pressure data during a single pedaling is determined according to the single pedal overrun stroke and pressure data, and the correlation coefficient change rate is determined according to the correlation coefficients of a number of adjacent two pedalings.

6. The clutch performance testing method according to claim 5, characterized in that: The confirmation method of determining the clutch slip rate includes: If the correlation coefficient change rate is greater than or equal to the change rate threshold, the confirmation method is to determine the clutch slip rate based on the pedal stroke consistency characteristic value, the correlation coefficient of the pedal over-travel and pressure data, and the wear degree.

7. The clutch performance testing method according to claim 6, characterized in that: The method for determining the clutch slip rate also includes: If the correlation coefficient change rate is less than the change rate threshold, the confirmation method is to determine the slip rate according to the pedal stroke consistency characteristic value and the wear degree.

8. The clutch performance testing method according to claim 1, characterized in that: The method also includes collecting a vehicle speed and an engine speed during several gear shifting or acceleration processes, determining a first climbing rate according to the vehicle speed, and determining a second climbing rate according to the engine speed.

9. The clutch performance testing method according to claim 8, characterized in that: The power loss amount is determined according to the vehicle speed and the engine speed, and the climbing rate proportional relationship between the vehicle speed and the engine speed is determined according to the first climbing rate and the second climbing rate.

10. The clutch performance testing method according to claim 9, characterized in that: The clutch slip rate is determined based on the pedal stroke consistency characteristic value, wear degree, power loss and climbing rate proportional relationship.

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