Flying and attaching transmission system lubricating oil abrasive particle monitoring device, method and system

Abstract

The invention belongs to the technical field of aircraft accessory transmission system monitoring, and particularly relates to an aircraft accessory transmission system lubricating oil abrasive particle monitoring device, method and system. The device comprises a sample pool, the two ends of the sample pool are connected with a lubricating oil outlet in the bottom of an accessory transmission casing and a transmission system lubricating oil loop respectively, a main view collecting device and an overlook collecting device are installed at the first axial position of the side wall of the sample pool, and a magnetic plug is arranged at the second axial position of the side wall of the sample pool. The magnetic plug is provided with an end head extending into the sample pool so as to adsorb ferromagnetic abrasive particles in the sample pool, and the second axial position is located behind the first axial position in the flowing direction of the lubricating oil. According to the method, real-time continuous monitoring of the abrasive particles can be achieved, the detection accuracy is improved, predictive maintenance can be carried out, and the maintenance cost is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of aircraft accessory drive system monitoring, and particularly relates to a device, method, and system for monitoring lubricating oil abrasive particles in an aircraft accessory drive system. Background Art

[0002] Currently, magnetic plugs are commonly used in aircraft accessory drive systems to monitor metal abrasive particles in lubricating oil. The magnetic plug adsorbs ferromagnetic particles in the lubricating oil through an internal permanent magnet, thereby achieving the detection and early warning of the wear of aircraft engine mechanical components to a certain extent. However, the magnetic plugs in the prior art have the following disadvantages in practical applications: 1. Insufficient real-time monitoring ability: The existing magnetic plugs cannot continuously monitor the metal abrasive particles in the lubricating oil. They can only issue an alarm after the metal abrasive particles accumulate to a certain threshold, lacking real-time monitoring ability, resulting in monitoring lag and being unable to timely reflect the health status of the equipment.

[0003] 2. Unable to predict the engine wear status: The magnetic plug can only judge the health status by regularly checking the accumulation of abrasive particles, without precise condition-based maintenance ability, increasing the complexity and operating cost of equipment maintenance.

[0004] 3. Limitations in monitoring non-ferromagnetic particles: The magnetic plug cannot effectively monitor non-ferromagnetic metal particles such as aluminum and copper, which may lead to the neglect of some important wear hidden dangers and affect the judgment of the overall health status of the system.

[0005] In summary, the limitations of the existing magnetic plugs in lubricating oil abrasive particle detection result in significant deficiencies in the lubricating oil fault monitoring and fault prevention of aircraft accessory drive systems. Therefore, there is an urgent need for a new monitoring device and method that can achieve continuous monitoring, predict the engine wear status, and simultaneously detect ferromagnetic and non-ferromagnetic abrasive particles to improve the accuracy and timeliness of lubricating oil system fault monitoring. Summary of the Invention

[0006] This application provides a device, method, and system for monitoring lubricating oil abrasive particles in an aircraft accessory drive system to solve the problems of insufficient real-time monitoring, inability to predict the engine wear status, and inability to monitor non-ferromagnetic abrasive particles existing in the prior art.

[0007] The first aspect of the present application provides a lubricating oil abrasive particle monitoring device for a fly - attached transmission system, including a sample cell. The sample cell is of a tubular structure, with both ends respectively connected to the lubricating oil outlet at the bottom of the accessory drive casing and the lubricating oil circuit of the transmission system. Two card slots are provided at the first axial position on the side wall of the sample cell, and a front - view acquisition device and a top - view acquisition device are respectively installed. The two card slots are circumferentially spaced 90° apart along the sample cell; a magnetic plug is provided at the second axial position on the side wall of the sample cell. The magnetic plug has a head extending into the sample cell to adsorb ferromagnetic abrasive particles in the sample cell. Along the lubricating oil flow direction, the second axial position is behind the first axial position.

[0008] Preferably, an illumination device is further provided at the first axial position. The illumination device includes a white LED light source and a light - homogenizing film, and the light - homogenizing film covers the outer wall of the transparent window of the sample cell.

[0009] Preferably, along the circumferential direction of the sample cell, the illumination device is spaced 135° from both the front - view acquisition device and the top - view acquisition device.

[0010] Preferably, the inner wall of the sample cell is covered with a white anti - reflection coating.

[0011] The second aspect of the present application provides a method for monitoring lubricating oil abrasive particles in a fly - attached transmission system. The lubricating oil abrasive particles are monitored according to the above - mentioned lubricating oil abrasive particle monitoring device for a fly - attached transmission system. The method includes: Step S1: Obtain a front - view image collected by the front - view acquisition device and a top - view image collected by the top - view acquisition device; Step S2: Match the abrasive particles in the front - view image and the top - view image with each other, and calculate the size of the matched abrasive particles; Step S3: Count the number of abrasive particles within a specified size range; Step S4: When the counted number of abrasive particles exceeds the threshold, send a maintenance signal. When the counted number of abrasive particles does not exceed the threshold, predict the change in the number of abrasive particles based on a time - series prediction network.

[0012] Preferably, step S2 further includes: Step S21: Use an edge - detection algorithm to calculate the maximum diameter of the abrasive particles; Step S22: Make a first correction to the maximum diameter of the abrasive particles according to the distance between the abrasive particles and the camera; Step S23: Make a second correction to the maximum diameter of the abrasive particles after the first correction according to a preset scaling factor, where the scaling factor is obtained by calibration after pre - injecting abrasive particles with a standard diameter into the sample cell.

[0013] Preferably, after step S4, it further includes: Step S5: When the counted number of abrasive particles exceeds the threshold, obtain the blockage status monitored by the magnetic plug. When the blockage status is consistent with the counted number of abrasive particles, it is determined that the number of ferromagnetic abrasive particles in the lubricating oil exceeds the standard. When the blockage status is inconsistent with the counted number of abrasive particles, it is determined that the number of non-ferromagnetic abrasive particles in the lubricating oil exceeds the standard.

[0014] The third aspect of the present application provides a lubricating oil abrasive particle monitoring system for a flying attachment drive system. The system includes the lubricating oil abrasive particle monitoring device for the flying attachment drive system as described above, and: An image acquisition module, configured to obtain a front view image acquired by the front view acquisition device and a top view image acquired by the top view acquisition device; An abrasive particle size calculation module, configured to match the abrasive particles in the front view image and the top view image with each other, and calculate the size of the matched abrasive particles; An abrasive particle number statistics module, configured to count the number of abrasive particles within a specified size range; A predictive maintenance module, configured to send a maintenance signal when the counted number of abrasive particles exceeds the threshold, and perform a prediction on the change of the number of abrasive particles based on a time series prediction network when the counted number of abrasive particles does not exceed the threshold.

[0015] Preferably, the abrasive particle size calculation module includes: A diameter calculation unit, configured to calculate the maximum diameter of the abrasive particles using an edge detection algorithm; A first correction unit, configured to perform a first correction on the maximum diameter of the abrasive particles according to the distance between the abrasive particles and the camera; A second correction unit, configured to perform a second correction on the maximum diameter of the abrasive particles after the first correction according to a preset scaling factor, where the scaling factor is obtained by calibration after putting abrasive particles with a standard diameter into the sample cell in advance.

[0016] Preferably, the system further includes: An abrasive particle type determination module, configured to obtain the blockage status monitored by the magnetic plug when the counted number of abrasive particles exceeds the threshold. When the blockage status is consistent with the counted number of abrasive particles, it is determined that the number of ferromagnetic abrasive particles in the lubricating oil exceeds the standard. When the blockage status is inconsistent with the counted number of abrasive particles, it is determined that the number of non-ferromagnetic abrasive particles in the lubricating oil exceeds the standard.

[0017] The present application can realize real-time continuous monitoring of abrasive particles, improve the accuracy of detection, and can perform predictive maintenance, reducing the maintenance cost. Description of the Drawings

[0018] Figure 1 It is a schematic installation diagram of the lubricating oil abrasive particle monitoring device of a preferred embodiment of the lubricating oil abrasive particle monitoring device for the flying attachment drive system of the present application.

[0019] Figure 2is this application Figure 1 Schematic structural diagram of the lubricating oil abrasive particle monitoring device of the illustrated embodiment.

[0020] Figure 3 is a flowchart of a preferred embodiment of the method for monitoring abrasive particles in the lubricating oil of the flywheel attachment drive system of this application.

[0021] Figure 4 is this application Figure 3 Schematic diagram for predicting the change in the number of abrasive particles of the illustrated embodiment. Detailed implementation manners

[0022] To make the purpose, technical solutions, and advantages of the implementation of this application clearer, the technical solutions in the implementation manners of this application will be described in more detail below with reference to the accompanying drawings in the implementation manners of this application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The described implementation manners are part of the implementation manners of this application, rather than all of the implementation manners. The implementation manners described below with reference to the accompanying drawings are exemplary and are intended to explain this application and should not be construed as a limitation of this application. Based on the implementation manners in this application, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application. The implementation manners of this application will be described in detail below with reference to the accompanying drawings.

[0023] The first aspect of this application provides a lubricating oil abrasive particle monitoring device for a flywheel attachment drive system. As Figure 1 shown, the lubricating oil abrasive particle monitoring device 3 is installed at the bottom of the accessory drive housing 2, and simultaneously monitors the lubricating oil in the aeroengine 1 and the accessory drive housing. As Figure 2 shown, the lubricating oil abrasive particle monitoring device 3 mainly includes a sample cell 32. The sample cell 32 is a tubular structure, and both ends are respectively connected to the lubricating oil outlet at the bottom of the accessory drive housing 2 and the lubricating oil circuit of the drive system. Two slots are provided at the first axial position on the side wall of the sample cell 32, and a front view acquisition device 33 and a top view acquisition device 34 are respectively installed. The two slots are circumferentially spaced 90° along the sample cell 32. A magnetic plug 36 is provided at the second axial position on the side wall of the sample cell 32. The magnetic plug 36 has a head extending into the sample cell 32 to adsorb ferromagnetic abrasive particles in the sample cell 32. Along the lubricating oil flow direction, the second axial position is behind the first axial position.

[0024] In this embodiment, the sample cell 32 is in the shape of a circular tube, and its inner diameter is the same as that of the lubricating oil circuit of the drive system. The side wall is provided with a clamping groove and a transparent window for installing the image acquisition device. The lubricating oil inlet joint 31 and the lubricating oil outlet joint 37 are installed at both ends of the sample cell 32. The lubricating oil inlet joint 31 is connected to the lubricating oil outlet at the bottom of the accessory drive casing 2 by means of a flange, and the lubricating oil outlet joint 37 is connected to the lubricating oil circuit of the drive system by means of a flange. The front-view acquisition device 33 and the top-view acquisition device 34 have the same structure and are both composed of a microscopic lens and a high-speed camera. The microscopic lens is installed in front of the lens of the high-speed camera. The front-view acquisition device 33 and the top-view acquisition device 34 are installed in the clamping groove of the sample cell 32, and the oil sample information is collected through the transparent window of the sample cell. The imaging range of the front-view acquisition device 33 and the top-view acquisition device 34 should not be less than the diameter of the sample cell. The collected image data is sent to the data processing system 5 through the data transmission system 4, and the data processing system 5 processes and analyzes the collected images. In addition, the lubricating oil first flows through the image acquisition system and then passes through the magnetic plug 36. The magnetic plug 36 further detects the ferromagnetic abrasive particles, and the detection results are compared with the detection results of the image acquisition system, so as to determine whether the abrasive particles are ferromagnetic abrasive particles or non-ferromagnetic abrasive particles, so as to carry out more targeted maintenance.

[0025] In some alternative embodiments, a lighting device 35 is further provided at the first axial position. The lighting device 35 includes a white LED light source and a light homogenizing film, and the light homogenizing film is covered on the outer wall of the transparent window of the sample cell 32.

[0026] In this embodiment, the light homogenizing film makes the light enter the lubricating oil sample cell more evenly, thereby reducing the image noise problem caused by uneven illumination.

[0027] In some alternative embodiments, along the circumferential direction of the sample cell 32, the lighting device 35 is spaced 135° from both the front-view acquisition device 33 and the top-view acquisition device 34.

[0028] In this embodiment, it is defined that the front-view acquisition device 33 rotates 90° clockwise to be the top-view acquisition device 34, and continues to rotate 135° clockwise at the top-view acquisition device 34 to be the lighting device 35, and continues to rotate 135° clockwise at the lighting device 35 to be the front-view acquisition device 33. Thus, the lighting device 35 can irradiate directly between the front-view acquisition device 33 and the top-view acquisition device 34, making the brightness of the images collected by the front-view acquisition device 33 and the top-view acquisition device 34 basically the same.

[0029] In some alternative embodiments, the inner wall of the sample cell 32 is covered with a white anti-reflection coating.

[0030] In this embodiment, the inner wall of the sample cell 32 is coated with a white light-reflection suppression coating, that is, a low-reflection coating, which is used to reduce light reflection. For example, a matte white paint that roughens the surface to cause diffuse reflection of light and thus reduces the overall reflectivity, or a white substrate made of silica or alumina material with micron- or nano-scale scattering particles added, or a white matte ceramic coating made by adding a matting agent to an alumina or zirconia ceramic matrix. This embodiment realizes the coexistence of "white" visually and "low reflection" optically. The core lies in sacrificing part of the reflection efficiency in exchange for minimizing ambient light interference. By suppressing background interference and enhancing working condition adaptability, this embodiment avoids image overexposure or stray light interference, especially when the oil flow is fast or there are bubbles, significantly improving the reliability and accuracy of the lubricating oil abrasive particle monitoring device.

[0031] In the second aspect of the present application, a method for monitoring lubricating oil abrasive particles in a flying attachment drive system is provided. The lubricating oil abrasive particles are monitored according to the lubricating oil abrasive particle monitoring device described above, as Figure 3 shown. The method includes: Step S1: Obtain a front view image collected by the front view acquisition device 33 and a top view image collected by the top view acquisition device 34; Step S2: Match the abrasive particles in the front view image and the top view image with each other, and calculate the size of the matched abrasive particles; Step S3: Count the number of abrasive particles within a specified size range; Step S4: When the counted number of abrasive particles exceeds the threshold, send a maintenance signal. When the counted number of abrasive particles does not exceed the threshold, predict the change in the number of abrasive particles based on a time series prediction network.

[0032] In step S1 of the present application, based on the front view acquisition device 33 and the top view acquisition device 34, real-time acquisition of lubricating oil images is performed, and then the collected data is preprocessed to separate impurities and background oil in the lubricating oil. The preprocessing operations include grayscale conversion, binarization processing, and morphological operations to eliminate bubbles.

[0033] Subsequently, the bounding box information of the remaining abrasive particles is detected. In step S2, abrasive particle matching is performed according to the bounding box information. The matching process can be based on the principle that the positions of the same abrasive particle in the front view image and the top view image correspond, or on the principle of the motion consistency of the same abrasive particle in the front view image and the top view image within a certain time range. When the abrasive particles are matched, the size of the abrasive particles can be calculated according to the abrasive particle image. Here, the size of the abrasive particles usually refers to the maximum diameter of the abrasive particles.

[0034] In some alternative embodiments, step S2 further includes: Step S21: Calculate the maximum diameter of the abrasive particles using an edge detection algorithm; Step S22: Perform the first correction on the maximum diameter of the abrasive grains according to the distance between the abrasive grains and the camera; Step S23: Perform the second correction on the maximum diameter of the abrasive grains after the first correction according to a preset scaling factor, where the scaling factor is obtained by calibration after standard-diameter abrasive grains are put into the sample cell 32 in advance.

[0035] It should be noted that after the device is installed, standard abrasive grains with a diameter of 10 microns are manually put in for calibration of the scaling factor, so as to reduce the error caused by the imaging distance and improve the accuracy of abrasive grain detection.

[0036] After that, in step S3, the number of abrasive grains within a specified size range is counted. Generally speaking, the abrasive grains are classified into large abrasive grains and small abrasive grains according to size, and these two types of abrasive grains are monitored respectively to accurately reflect the change of particles in the lubricating oil. In this embodiment, the abrasive grains with a size greater than or equal to 15 microns are defined as large abrasive grains, and the abrasive grains with a size less than 15 microns are defined as small abrasive grains.

[0037] Finally, in step S4, the wear state of the engine is predicted. Using the cumulative state of the abrasive grains, the information of the large abrasive grains and the small abrasive grains is input into the time series prediction network to predict the wear state of the aero-engine, so as to realize predictive maintenance. As Figure 4 shown, when the cumulative amount of the abrasive grains reaches the threshold, the system reminds for maintenance. When the abrasive grains do not reach the threshold, the system displays the time for the predicted cumulative state of the abrasive grains to reach the threshold. In this embodiment, the time series prediction network is a long short-term memory network.

[0038] In some alternative embodiments, further included after step S4: Step S5: When the counted number of abrasive grains exceeds the threshold, obtain the blockage state monitored by the magnetic plug 36. When the blockage state is consistent with the counted number of abrasive grains, it is determined that the number of ferromagnetic abrasive grains in the lubricating oil exceeds the standard. When the blockage state is inconsistent with the counted number of abrasive grains, it is determined that the number of non-ferromagnetic abrasive grains in the lubricating oil exceeds the standard.

[0039] In this embodiment, when the system reminds for maintenance, check the blockage situation of the magnetic plug. If the magnetic plug is not blocked, it can be determined that the number of non-ferromagnetic abrasive grains in the lubricating oil exceeds the standard. When the magnetic plug is blocked, it is determined that the number of ferromagnetic abrasive grains in the lubricating oil exceeds the standard. After that, corresponding maintenance measures can be taken for the two types of failure situations respectively.

[0040] This application can realize real-time and accurate detection of the lubricating oil abrasive grains, and effectively predict the health state of the lubricating oil system, so as to provide more comprehensive fault warning and maintenance support during the operation of the aircraft accessory drive system, and improve the overall reliability and safety.

[0041] The third aspect of this application provides a lubricating oil abrasive particle monitoring system for the flying attachment drive system corresponding to the above method. The system includes the lubricating oil abrasive particle monitoring device for the flying attachment drive system as described above, and: An image acquisition module, configured to acquire a front view image acquired by the front view acquisition device 33 and a top view image acquired by the top view acquisition device 34; An abrasive particle size calculation module, configured to match the abrasive particles in the front view image and the top view image with each other, and calculate the size of the matched abrasive particles; An abrasive particle quantity statistics module, configured to count the quantity of abrasive particles within a specified size range; A predictive maintenance module, configured to send a maintenance signal when the counted quantity of abrasive particles exceeds a threshold, and predict the change in the quantity of abrasive particles based on a time series prediction network when the counted quantity of abrasive particles does not exceed the threshold.

[0042] In some alternative embodiments, the abrasive particle size calculation module includes: A diameter calculation unit, configured to calculate the maximum diameter of the abrasive particles using an edge detection algorithm; A first correction unit, configured to perform a first correction on the maximum diameter of the abrasive particles according to the distance between the abrasive particles and the camera; A second correction unit, configured to perform a second correction on the maximum diameter of the abrasive particles after the first correction according to a preset scaling factor, where the scaling factor is obtained by calibration after putting abrasive particles with a standard diameter into the sample pool 32 in advance.

[0043] In some alternative embodiments, the system further includes: An abrasive particle type determination module, configured to obtain the blockage state monitored by the magnetic plug 36 when the counted quantity of abrasive particles exceeds the threshold, determine that the quantity of ferromagnetic abrasive particles in the lubricating oil exceeds the standard when the blockage state is consistent with the counted quantity of abrasive particles, and determine that the quantity of non-ferromagnetic abrasive particles in the lubricating oil exceeds the standard when the blockage state is inconsistent with the counted quantity of abrasive particles.

[0044] As described above, the above are only specific embodiments of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in this application should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A lubricating oil wear particle monitoring device for a flying transmission system, characterized in that: The sample pool (32) comprises a tubular structure, wherein the two ends of the sample pool (32) are respectively connected to the lubricating oil outlet at the bottom of the accessory transmission casing (2) and the lubricating oil circuit of the transmission system; the side wall of the sample pool (32) is provided with two slots at a first axial position, respectively provided with a main view collection device (33) and a top view collection device (34); the two slots are spaced 90 degrees apart along the circumference of the sample pool (32); the side wall of the sample pool (32) is provided with a magnetic plug (36) at a second axial position, the magnetic plug (36) having an end extending into the sample pool (32) to absorb ferromagnetic abrasive particles in the sample pool (32); along the flow direction of the lubricating oil, the second axial position is located behind the first axial position.

2. The lubricating oil wear particle monitoring device for a flying attachment transmission system as claimed in claim 1, characterized in that: An illumination device (35) is also provided at the first axial position, the illumination device (35) comprising a white LED light source and a light homogenizing film, the light homogenizing film being coated on the outer wall of the transparent window of the sample pool (32).

3. The lubricating oil wear particle monitoring device for a flying attachment transmission system as claimed in claim 2, characterized in that: Along the circumferential direction of the sample pool (32), the illumination device (35) is spaced 135 degrees from the main view collection device (33) and the top view collection device (34).

4. The lubricating oil wear particle monitoring device for a flying attachment transmission system as claimed in claim 1, characterized in that: The inner wall of the sample pool (32) is covered with a white reflection-inhibiting coating.

5. A method for monitoring lubricating oil wear particles in a flying transmission system, characterized in that: The lubricating oil wear particle monitoring device for a flying attachment transmission system according to any one of claims 1 to 4 is used to monitor lubricating oil wear particles, and the method comprises: Step S1, acquiring a main view image acquired by a main view acquisition device (33) and a top view image acquired by a top view acquisition device (34); Step S2, matching the abrasive particles in the main view image and the top view image, and calculating the sizes of the matched abrasive particles; Step S3, counting the number of abrasive particles within a specified size range; Step S4: When the counted number of wear particles exceeds a threshold, a maintenance signal is issued; when the counted number of wear particles does not exceed the threshold, a change in the number of wear particles is predicted based on a time series prediction network.

6. The method for monitoring lubricating oil wear particles in a flying transmission system according to claim 5, characterized in that: Step S2 further comprises: Step S21, using an edge detection algorithm to calculate the maximum diameter of the abrasive particles; Step S22, performing a first correction on the maximum diameter of the abrasive particles according to the distance between the abrasive particles and the camera; Step S23, performing a second correction on the maximum diameter of the abrasive grains after the first correction according to a preset scaling factor, wherein the scaling factor is obtained by calibration after abrasive grains of a standard diameter are put into the sample pool (32) in advance.

7. The method for monitoring lubricating oil wear particles in a flying transmission system according to claim 5, characterized in that: Step S4 further includes: Step S5, when the counted number of abrasive particles exceeds the threshold, the blockage state monitored by the magnetic plug (36) is obtained. When the blockage state is consistent with the counted number of abrasive particles, it is determined that the number of ferromagnetic abrasive particles in the lubricating oil exceeds the standard. When the blockage state is inconsistent with the counted number of abrasive particles, it is determined that the number of non-ferromagnetic abrasive particles in the lubricating oil exceeds the standard.

8. A lubricating oil wear particle monitoring system for a flying attachment transmission system, characterized in that: The system comprises the lubricating oil wear particle monitoring device for a flying attachment transmission system according to any one of claims 1 to 4, and: An image acquisition module, used to acquire a main view image acquired by a main view acquisition device (33) and a top view image acquired by a top view acquisition device (34); an abrasive particle size calculation module, used for matching the abrasive particles in the main view image and the top view image with each other, and calculating the size of the matched abrasive particles; Abrasive particle counting module, used to count the number of abrasive particles within a specified size range; The predictive maintenance module is used to send out a maintenance signal when the statistical number of wear particles exceeds a threshold value, and to predict the change of the number of wear particles based on the time series prediction network when the statistical number of wear particles does not exceed the threshold value.

9. The lubricating oil wear particle monitoring system for a flying attachment transmission system as claimed in claim 8, characterized in that: The abrasive particle size calculation module comprises: A diameter calculation unit, used for calculating the maximum diameter of the abrasive particles using an edge detection algorithm; A first correction unit, used for performing a first correction on the maximum diameter of the abrasive particles according to the distance between the abrasive particles and the camera; The second correction unit is used to perform a second correction on the maximum diameter of the abrasive grains after the first correction according to a preset scaling factor, wherein the scaling factor is obtained by pre-calibrating by putting abrasive grains of standard diameter into the sample pool (32).

10. The lubricating oil wear particle monitoring system of the flying attachment transmission system as claimed in claim 8, characterized in that: The system further comprises: The abrasive type determination module is used to obtain the blockage state monitored by the magnetic plug (36) when the counted number of abrasive particles exceeds a threshold value, and when the blockage state is consistent with the counted number of abrasive particles, it is determined that the number of ferromagnetic abrasive particles in the lubricating oil exceeds the standard; when the blockage state is inconsistent with the counted number of abrasive particles, it is determined that the number of non-ferromagnetic abrasive particles in the lubricating oil exceeds the standard.

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