Method, device and system for detecting damage of sheath of driving shaft

Abstract

The invention provides a method, a device and a system for detecting damage of a sheath of a driving shaft, relates to the technical field of state monitoring of an automobile transmission system, and aims at solving the problems of hysteresis and sight dead angle leak detection of traditional manual inspection from the source by acquiring lubricating medium parameters in a short distance in real time through a built-in flexible sensor. And fine medium changes in the initial breakage stage are accurately captured. The change can be converted into quantifiable capacitance change response, accurate judgment of the damage condition is achieved based on the change, manual subjective judgment can be replaced, and the problem that weak signals are difficult to capture and quantify at the initial stage of damage is solved. Manual intervention is not needed, the detection efficiency and accuracy can be remarkably improved, the damage risk can be early warned in advance, potential safety hazards such as universal joint damage and transmission system failure can be effectively avoided, the defects in the prior art are fundamentally overcome, and a powerful guarantee is provided for safe and stable operation of the automobile transmission system.

Description

Technical Field

[0001] This invention relates to the field of automotive transmission system condition monitoring technology, and in particular to a method, device and system for detecting damage to the sheath of a drive shaft. Background Technology

[0002] The constant velocity joint drive shaft bushing is a critical protective component in automotive transmission systems. Filled with grease, its core function is to isolate the universal joint from external contaminants such as dust and moisture, effectively protecting the universal joint and ensuring the stable operation of the transmission system. Because the bushing is typically made of rubber, it is highly susceptible to failure during long-term vehicle use due to material aging, fatigue damage caused by alternating loads, and external impacts. Once the bushing is damaged, the internal grease will leak, causing the universal joint to lose effective lubrication. This leads to abnormal wear, unusual operating noises, and ultimately, transmission system failure, posing a serious safety hazard to the vehicle.

[0003] Currently, the industry mainly relies on periodic manual visual inspections to monitor the condition of automotive drive shaft bushings. This monitoring method has many insurmountable defects and shortcomings, specifically: First, it has a significant lag. In the early stages of bushing damage, grease leakage is slow, and related damage marks are difficult to detect from the outside. Often, by the time manual inspection discovers the damage, the internal universal joint has already suffered irreversible damage. Second, the detection efficiency is low. Manual inspection requires lifting the vehicle and must be performed by professional personnel, which is not only time-consuming and labor-intensive but also cannot adapt to the mainstream trend of modern vehicles moving towards intelligent and predictive maintenance. Third, the detection reliability is poor. For minor cracks or tiny holes on the bushing, especially damage areas located in blind spots, it is very easy to miss them, making it impossible to achieve comprehensive and accurate monitoring of the bushing's condition. Summary of the Invention

[0004] The purpose of this invention is to provide a method, device and system for detecting damage to the sheath of a drive shaft, which can achieve accurate and real-time judgment of the damage to the sheath, and effectively solve the problems of lag, inefficiency and unreliability of existing manual visual inspection.

[0005] In a first aspect, embodiments of the present invention provide a method for detecting damage to a drive shaft sheath. The method includes: monitoring the medium parameters of a lubricating medium in the medium-accommodating space of a target sheath using a flexible sensor; wherein the flexible sensor is internally installed in the medium-accommodating space of the target sheath; determining the capacitance change response when the monitored medium parameters change; and determining the sheath damage condition of the target sheath based on the capacitance change response.

[0006] In conjunction with the first aspect, the present invention also provides a first implementation of the first aspect, wherein the flexible sensor includes two electrode structures arranged concentrically; the two concentric electrode structures use the lubricating medium and air in the medium accommodating space as dielectrics to jointly constitute a capacitor structure.

[0007] In conjunction with the first aspect, this embodiment of the invention also provides a second implementation of the first aspect, wherein the step of determining the capacitance change response when the monitored medium parameters change includes: sensing the change in the medium parameters of the lubricating medium in the medium accommodating space through two concentric electrode structures; determining the capacitance structure change caused by the change in the medium parameters; and determining the resulting capacitance change response based on the capacitance structure change.

[0008] In conjunction with the first aspect, this embodiment of the invention also provides a third implementation of the first aspect, wherein the step of determining the sheath damage condition of the target sheath based on the capacitance change response includes: converting the real-time capacitance value corresponding to the capacitance change response into a voltage signal, calculating the deviation between the voltage signal and a preset reference voltage signal; and determining the sheath damage condition of the target sheath based on the deviation.

[0009] In conjunction with the first aspect, the present invention also provides a fourth implementation of the first aspect, wherein the step of determining the damage status of the target sheath based on the deviation includes: when the deviation meets a preset deviation threshold and continues to exceed a preset duration, determining that the target sheath is damaged.

[0010] In conjunction with the first aspect, the present invention also provides a fifth embodiment of the first aspect, wherein the method further includes: triggering a warning signal when it is determined that the target sheath is damaged; wherein the deviation threshold includes an upper threshold and a lower threshold; when the deviation is higher than the upper threshold, a first warning signal is triggered; the first warning signal is used to indicate that there is moisture intrusion in the medium containing space; when the deviation is lower than the lower threshold, a second warning signal is triggered; the second warning signal is used to indicate that there is lubricating medium leakage in the medium containing space.

[0011] In conjunction with the first aspect, the present invention also provides a sixth embodiment of the first aspect, wherein the electrode structure is a ring structure.

[0012] In conjunction with the first aspect, the present invention also provides a seventh embodiment of the first aspect, wherein the step of calculating the deviation between the voltage signal and the preset reference voltage signal includes: filtering the voltage signal; and calculating the deviation between the filtered voltage signal and the preset reference voltage signal.

[0013] Secondly, embodiments of the present invention provide a drive shaft sheath damage detection device, the device comprising: a monitoring module for monitoring the medium parameters of the lubricating medium in the medium accommodating space of the target sheath using a flexible sensor; wherein the flexible sensor is internally installed in the medium accommodating space of the target sheath; a response module for determining the capacitance change response generated when the monitored medium parameters change; and an output module for determining the sheath damage condition of the target sheath based on the capacitance change response.

[0014] Thirdly, embodiments of the present invention provide a drive shaft sheath damage detection system, which is equipped with the apparatus of the above embodiments for performing the methods of any of the above embodiments.

[0015] The embodiments of this invention bring the following beneficial effects: This invention provides a method, device, and system for detecting damage to drive shaft sheaths. By utilizing a built-in flexible sensor to collect lubrication medium parameters in real time and at close range, it overcomes the lag inherent in traditional manual visual inspection, accurately capturing subtle medium changes in the early stages of sheath damage while effectively avoiding missed detections due to blind spots. By converting subtle changes in medium parameters into quantifiable capacitance changes, it solves the technical pain point of difficulty in capturing and quantifying weak signals in the early stages of damage. This invention accurately determines the damage based on capacitance change responses, replacing the traditional subjective judgment mode and significantly improving the objectivity and reliability of the detection results. The entire detection process, from data acquisition and signal processing to result output, requires no manual intervention, significantly improving detection efficiency and accuracy. It also provides early warning of the risk of sheath damage development, effectively avoiding safety hazards such as universal joint damage and transmission system failure caused by undetected sheath damage. This fundamentally overcomes many shortcomings of existing technologies and provides strong protection for the safe and stable operation of automotive transmission systems.

[0016] Other features and advantages of the invention will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the techniques described above.

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A flowchart of a method for detecting damage to the sheath of a drive shaft provided in an embodiment of the present invention; Figure 2 A flowchart of another method for detecting damage to the sheath of a drive shaft provided in an embodiment of the present invention; Figure 3 A schematic diagram of a drive shaft sheath damage detection device provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] This invention provides a method, device, and system for detecting damage to the sheath of a drive shaft, which can achieve accurate and real-time judgment of the sheath damage, effectively solving the problems of lag, inefficiency, and unreliability of existing manual visual inspection.

[0023] To facilitate understanding, a method for detecting damage to the sheath of a drive shaft provided in an embodiment of the present invention will first be described, referring to... Figure 1 The method includes the following steps: Step S102: Monitor the medium parameters of the lubricating medium in the medium-containing space of the target sheath using a flexible sensor.

[0024] The target sheath is the constant velocity joint drive shaft sheath to be tested, a rubber protective component in the automotive transmission system that encloses the universal joint and contains the lubricating medium. The medium-containing space is the sealed cavity formed by the target sheath, the universal joint, and the drive shaft. This space is the storage and function area for the lubricating medium, and also the core area where external contaminants can enter and the lubricating medium can leak after the sheath is damaged. The lubricating medium is usually grease, which fills the medium-containing space to reduce frictional losses during universal joint operation. Its performance stability directly affects the operating state of the transmission system. Its medium parameters are measurable physical quantities related to the characteristics of the lubricating medium, including but not limited to dielectric constant, humidity, viscosity, and liquid level. These parameters will change regularly with the leakage and contamination of the lubricating medium.

[0025] The flexible sensor is a sensor with bendable and deformable characteristics, which can adapt to the irregular spatial structure inside the sheath, closely fitting the inner wall of the sheath or embedding it in the lubricating medium. It achieves stable monitoring without affecting the normal transmission of the drive shaft, and its material and structural design can withstand complex operating conditions such as vibration and temperature changes during vehicle operation. In this embodiment of the invention, the flexible sensor is built into the medium-containing space of the target sheath, continuously collecting the medium parameters of the lubricating medium. Compared with the external visual inspection method in the prior art, this embodiment of the invention uses a flexible sensor to directly contact the core area where the lubricating medium is located, enabling the capture of subtle changes in the lubricating medium in the early stages of sheath damage, thus avoiding the lag of external inspection from the source. Furthermore, this monitoring method does not require disassembling or lifting the vehicle; the sensor can collect data in real time, eliminating the dependence on professional personnel and equipment for manual inspection, improving monitoring efficiency, and aligning with the development trend of intelligent and predictive maintenance of vehicles. At the same time, the adaptable design of the flexible sensor allows it to cover key areas of the medium-containing space, avoiding the problem of missed detection due to blind spots, laying a data foundation for subsequent accurate judgment of damage.

[0026] Step S104: For the monitored medium parameters, determine the capacitance change response when the medium parameters change.

[0027] The capacitance change response refers to the fluctuation in capacitance value of a flexible sensor caused by changes in the parameters of the surrounding medium. Since flexible sensors can be designed using capacitive sensing principles, their capacitance value is closely related to parameters such as the dielectric constant of the surrounding medium. When the lubricating medium leaks (the total amount of medium decreases) or is contaminated by external moisture / dust (the dielectric constant of the medium changes), the characteristics of the medium in the sensor's environment change, which will cause a corresponding change in its capacitance value. This correlation between capacitance value and changes in medium parameters is called the capacitance change response.

[0028] Step S106: Determine the damage status of the target sheath based on the capacitance change response.

[0029] The condition of the sheath includes core information such as whether the sheath is damaged, the extent of damage (e.g., minor cracks, small holes, large-area damage), and the trend of damage development. This information is used to determine whether there are any safety hazards in the drive shaft transmission system and whether maintenance is required. Based on the aforementioned steps, the corresponding electrical signal characteristics can be converted into intuitive damage judgment results according to the capacitance change response, achieving an accurate assessment of the sheath's condition. Compared to the subjective judgment of traditional manual visual inspection, this step is based on quantitative electrical signal analysis, resulting in more objective and reliable judgment results. Furthermore, combined with real-time monitoring data, the damage development trend can be predicted in advance, providing data support for predictive maintenance of the vehicle. This fundamentally solves the technical problems of lag, inefficiency, and unreliability of traditional methods, ensuring the operational safety of the drive shaft transmission system.

[0030] In one implementation, the capacitance change characteristics (such as capacitance change amplitude, change rate, fluctuation frequency, etc.) corresponding to different degrees of damage can be experimentally calibrated to establish a mapping relationship between capacitance change response and damage status. During actual testing, the real-time acquired capacitance change response can be compared with the calibrated characteristic parameters. If the capacitance change response exceeds the normal threshold range and matches the characteristics corresponding to a certain type of damage, it can be determined that the sheath has a corresponding degree of damage. Furthermore, the continued trend of capacitance change can be used to determine whether the damage is worsening.

[0031] In summary, this invention utilizes a built-in flexible sensor to collect lubricating medium parameters in real time and at close range, overcoming the inherent lag in traditional manual visual inspection. It can accurately capture subtle medium changes in the early stages of sheath damage while effectively avoiding missed detections due to blind spots. By converting subtle medium parameter changes into quantifiable capacitance changes, it solves the technical challenge of capturing and quantifying weak signals in the early stages of damage. This invention accurately determines the damage based on capacitance change responses, replacing the traditional subjective judgment method and significantly improving the objectivity and reliability of the detection results. The entire detection process, from data acquisition and signal processing to result output, requires no manual intervention. This not only significantly improves detection efficiency and accuracy but also provides early warning of sheath damage development risks, effectively preventing safety hazards such as universal joint damage and transmission system failure caused by undetected sheath damage. It fundamentally overcomes many shortcomings of existing technologies, providing strong protection for the safe and stable operation of automotive transmission systems.

[0032] Furthermore, based on the above embodiments, this invention also provides another method for detecting damage to the drive shaft sheath. In conjunction with the above embodiments, the flexible sensor includes two electrode structures arranged concentrically; one electrode surrounds to form an outer ring electrode, and the other electrode is coaxially positioned inside the outer electrode to form an inner ring electrode. A fixed and uniform spacing is maintained between the two electrodes to ensure full coverage and consistent sensing of the detection area. In installation applications, these two concentric electrode structures are integrated into the medium-containing space of the drive shaft sheath. A stable connection and sealed fit with the sheath can be achieved through integral encapsulation during sheath vulcanization or mechanical fixation. At this time, the lubricating medium (grease) filling the sheath and a small amount of air in the space together constitute the dielectric of the electrode structure. The two concentric electrodes and this dielectric work together to form a complete capacitance detection structure. The core characteristic of this capacitance structure is determined by the physical parameters of the dielectric (especially the dielectric constant). When the lubricating medium inside the sheath leaks due to damage, moisture intrudes, or contaminants are mixed in, the dielectric constant of the dielectric will change significantly, thereby causing a change in the capacitance value of the capacitance structure. Furthermore, the electrode structure can be designed as a ring structure, adaptable to the cylindrical cavity of the drive shaft sleeve. The outer ring electrode completely surrounds the inner wall of the sleeve circumferentially, while the inner ring electrode is coaxially arranged, ensuring that the detection area between the two electrodes fully covers the medium-containing space inside the sleeve, avoiding circumferential detection blind spots. Therefore, any minor cracks, pinholes, or other damage at any circumferential location of the sleeve will cause a change in the state of the lubricating medium in that area. The concentric ring electrode assembly can quickly detect this change, completely solving the problem of missed detections due to blind spots in traditional manual visual inspection, and significantly improving the comprehensiveness of the detection. The electrode body can be made of highly conductive copper foil, and the flexible sensor can be made of a flexible polyimide substrate, giving the entire ring sensor good flexibility. It can tightly conform to the cylindrical curved surface of the inner wall of the sleeve, perfectly adapting to the cavity shape inside the sleeve, without affecting the rotational transmission of the drive shaft.

[0033] Correspondingly, refer to Figure 2 The method includes the following steps: Step S202: Monitor the medium parameters of the lubricating medium in the medium-containing space of the target sheath using a flexible sensor.

[0034] Step S204: The change in the medium parameters of the lubricating medium in the medium-containing space is sensed through two concentric electrode structures.

[0035] In conjunction with the above embodiments, the two concentric electrode structures can form a detection area within the dielectric containment space. The lubricating medium (grease) and a small amount of air filling the sheath can together serve as the dielectric of this electrode structure, constituting a complete capacitance detection structure. Therefore, the two concentric electrode structures of the sensor are always in a real-time sensing state. When the sheath is intact, the composition of the lubricating medium within the dielectric containment space is stable, the air content is fixed, and the corresponding dielectric constant, humidity, pressure, and other dielectric parameters remain within normal ranges. When the sheath is damaged, external moisture, dust, and other contaminants intrude, or internal grease leaks, which directly leads to a significant change in the dielectric constant of the lubricating medium (the dielectric constant of moisture is approximately 80, far higher than that of grease at 2-4), an increase in humidity, or an increase in the air content due to grease leakage. These changes in dielectric parameters directly affect the dielectric environment between the two concentric electrodes. Based on this, the embodiments of the present invention continuously monitor changes in the dielectric environment through the electrode structure, and can capture changes in parameters such as fluctuations in the dielectric constant, humidity increases, or pressure fluctuations of the lubricating medium in real time.

[0036] Step S206: Determine the change in capacitor structure caused by the change in dielectric parameters.

[0037] Step S208: Determine the resulting capacitance change response based on the capacitance structure change.

[0038] When the aforementioned electrode structure senses changes in dielectric parameters, it directly triggers changes in the core characteristics of the capacitor structure. For example, if the sheath is damaged, allowing moisture to infiltrate, the dielectric constant of the lubricating medium will significantly increase due to the high dielectric properties of moisture. Based on the capacitance calculation formula, the capacitance value of the capacitor structure will rise sharply. If the sheath is damaged, causing grease leakage, the proportion of air in the dielectric space increases (the dielectric constant of air is much lower than that of grease), causing the overall dielectric constant of the dielectric to decrease, thus leading to a significant reduction in the capacitance value of the capacitor structure. If contaminant intrusion causes increased humidity or pressure fluctuations, it will also indirectly cause irregular fluctuations in the capacitance value of the capacitor structure by affecting the uniformity or density of the dielectric. In summary, this embodiment of the invention, through the inherent characteristics of the capacitor structure, transforms abstract changes in dielectric parameters into concrete changes in the capacitor structure, so as to accurately detect sheath damage based on changes in the dielectric state.

[0039] Compared to directly monitoring dielectric parameters, capacitive sensing responds rapidly to minute changes in dielectric constant, capturing subtle dielectric alterations in the early stages of sheath damage. The concentric ring electrode design effectively shields against external electromagnetic interference, ensuring that the capacitance change response originates solely from parameter changes within the dielectric containment space. In summary, this invention indirectly reflects the dielectric state based on capacitance change response, exhibiting higher sensitivity and interference resistance.

[0040] Step S210: Determine the damage status of the target sheath based on the capacitance change response.

[0041] The automotive operating environment is subject to various interference factors such as drive shaft rotation vibration, electromagnetic radiation, and temperature fluctuations. The original capacitance signal is weak and easily affected by interference, making direct use for judgment prone to misjudgment. This invention converts the real-time capacitance value corresponding to capacitance changes into a voltage signal. Furthermore, the voltage signal can be optimized using mature signal conditioning techniques (such as amplification, filtering, and temperature compensation) to significantly improve signal stability and signal-to-noise ratio, ensuring that the signal accurately reflects changes in the internal dielectric state of the sheath and avoiding detection errors caused by interference. Further, the deviation between the voltage signal and a preset reference voltage signal is calculated; based on this deviation, the sheath damage status of the target sheath is determined.

[0042] In this invention, the deviation threshold includes an upper limit threshold and a lower limit threshold. These thresholds can be calibrated through extensive experiments to reliably distinguish between normal and damaged states (e.g., by combining the dielectric constant variation range corresponding to moisture intrusion and grease leakage to determine the corresponding voltage deviation critical value). In this embodiment, when the deviation meets the preset deviation threshold (ΔV>V), max or ΔV <V min Furthermore, if the damage to the target sheath continues for more than a preset time (e.g., 30 seconds to 500 milliseconds), it will be determined that the target sheath is damaged, in order to avoid false alarms caused by momentary interference and ensure the reliability of the determination result.

[0043] Furthermore, based on the direction in which the deviation exceeds the threshold, corresponding classification warning signals can be triggered to accurately locate the cause of the damage. When the deviation is higher than the upper threshold, the first warning signal is triggered; when the deviation is lower than the lower threshold, the second warning signal is triggered. The first warning signal indicates that moisture has entered the medium-containing space; the second warning signal indicates that lubricating medium is leaking from the medium-containing space. Since the dielectric constant of moisture is much higher than that of grease, this situation corresponds to moisture entering the medium-containing space due to sheath damage. The first warning signal (such as a red warning light on the dashboard or a moisture intrusion pop-up in the vehicle networking APP) will clearly indicate the type of damage, reminding the user to deal with it in time to avoid universal joint corrosion; the second warning signal (such as a yellow warning light on the dashboard or a grease leakage push notification in the vehicle networking APP) will indicate the risk of lubricating medium leakage, preventing abnormal wear of the universal joint due to lubrication failure. In summary, the first and second warning signals can clearly distinguish between two types of damage: moisture intrusion and grease leakage. This provides users and maintenance personnel with accurate fault location information, avoiding blind repairs. At the same time, targeted risk priority reminders (such as moisture intrusion, which may lead to faster corrosion, have a higher warning level than grease leakage) further enhance the practicality of predictive maintenance and fundamentally avoid secondary damage to the transmission system caused by inaccurate location of sheath damage.

[0044] Furthermore, based on the above embodiments, this embodiment of the invention also provides a drive shaft sheath damage detection device, referring to... Figure 3 The device includes: a monitoring module 10 for monitoring the medium parameters of the lubricating medium in the medium-containing space of the target sheath using a flexible sensor; wherein the flexible sensor is built into the medium-containing space of the target sheath; a response module 20 for determining the capacitance change response when the monitored medium parameters change; and an output module 30 for determining the sheath damage condition of the target sheath based on the capacitance change response.

[0045] The drive shaft sheath damage detection device provided in this embodiment of the invention has the same implementation principle and technical effect as the aforementioned method embodiment. For the sake of brevity, any parts not mentioned in the device embodiment can be referred to the corresponding content in the aforementioned method embodiment.

[0046] Furthermore, this embodiment of the invention also provides a drive shaft bushing damage detection system, which may be a standard component deeply integrated with the drive shaft bushing and the vehicle electronic system (ECU, CAN bus) at the time of vehicle manufacture, or a modular aftermarket upgrade system. This system is equipped with the aforementioned device for executing the method of any of the above embodiments. The drive shaft bushing damage detection system provided in this embodiment of the invention has the same implementation principle and technical effects as the aforementioned method embodiments. For the sake of brevity, any parts not mentioned in the system embodiment section can be referred to the corresponding content in the aforementioned method embodiments.

[0047] This invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described... Figures 1 to 2 The steps of any of the methods shown. Embodiments of the present invention also provide a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the above-described steps. Figures 1 to 2 The steps of any of the methods shown. Embodiments of the present invention also provide a structural schematic diagram of an electronic device, such as... Figure 4 The diagram shows the structure of the electronic device, which includes a processor 101 and a memory 100. The memory 100 stores computer-executable instructions that can be executed by the processor 101. The processor 101 executes the computer-executable instructions to implement the above-mentioned... Figures 1 to 2 Any of the methods shown.

[0048] exist Figure 4In the illustrated embodiment, the electronic device further includes a bus 102 and a communication interface 103, wherein the processor 101, the communication interface 103, and the memory 100 are connected via the bus 102. The memory 100 may include high-speed random access memory (RAM) or non-volatile memory, such as at least one disk drive. Communication between this system network element and at least one other network element is achieved through at least one communication interface 103 (which can be wired or wireless), using the Internet, wide area network, local area network, metropolitan area network, etc. Bus 102 can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, or an AMBA (Advanced Microcontroller Bus Architecture) bus. AMBA defines three types of buses: APB (Advanced Peripheral Bus), AHB (Advanced High-performance Bus), and AXI (Advanced eXtensible Interface). Bus 102 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 4The diagram uses only a single double-headed arrow, but this does not imply a single bus or a single type of bus. Processor 101 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of processor 101 or by instructions in software form. Processor 101 can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this application can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software module can reside in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory, and the processor 101 reads information from the memory and, in conjunction with its hardware, completes the aforementioned tasks. Figures 1 to 2 Any of the methods shown.

[0049] The computer program product of the drive shaft sheath damage detection method, device, and system provided in this invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the methods described in the preceding method embodiments. Specific implementations can be found in the method embodiments and will not be repeated here. Those skilled in the art will understand that, for convenience and brevity, the specific working process of the system described above can be referred to the corresponding process in the preceding method embodiments, and will not be repeated here. Furthermore, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0050] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Finally, it should be noted that the above embodiments are merely specific implementations of the invention, used to illustrate the technical solutions of the invention, and not to limit it. The scope of protection of the invention is not limited thereto. Although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in this invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this invention, and should all be covered within the scope of protection of this invention. Therefore, the scope of protection of this invention should be determined by the scope of the claims.

Claims

1. A method for detecting damage to the sheath of a drive shaft, characterized in that, The method includes: The medium parameters of the lubricating medium in the medium-containing space of the target sheath are monitored by a flexible sensor; wherein the flexible sensor is built into the medium-containing space of the target sheath. For the monitored dielectric parameters, determine the capacitance change response when the dielectric parameters change; The damage status of the target sheath is determined based on the capacitance change response.

2. The method according to claim 1, characterized in that, The flexible sensor includes two electrode structures arranged concentrically; the two concentric electrode structures use the lubricating medium and air within the medium-containing space as dielectrics to jointly form a capacitor structure.

3. The method according to claim 2, characterized in that, The step of determining the capacitance change response when the monitored dielectric parameters change includes: The changes in the medium parameters of the lubricating medium in the medium-containing space are sensed through the two concentric electrode structures. Determine the changes in capacitor structure caused by the change in dielectric parameters; The resulting capacitance change response is determined based on the changes in the capacitor structure.

4. The method according to claim 1, characterized in that, The step of determining the sheath damage condition of the target sheath based on the capacitance change response includes: The real-time capacitance value corresponding to the capacitance change response is converted into a voltage signal, and the deviation between the voltage signal and the preset reference voltage signal is calculated. The extent of damage to the target sheath is determined based on the deviation.

5. The method according to claim 4, characterized in that, The step of determining the sheath damage condition of the target sheath based on the deviation includes: When the deviation meets the preset deviation threshold and continues for more than the preset duration, the target sheath is determined to be damaged.

6. The method according to claim 5, characterized in that, The method further includes: When the target sheath is determined to be damaged, an early warning signal is triggered; The deviation threshold includes an upper limit threshold and a lower limit threshold; When the deviation exceeds the upper limit threshold, a first warning signal is triggered; the first warning signal is used to indicate that moisture has intruded into the medium-containing space. When the deviation is lower than the lower threshold, a second warning signal is triggered; the second warning signal is used to indicate that there is a lubricating medium leak in the medium accommodating space.

7. The method according to claim 2, characterized in that, The electrode structure is a ring structure.

8. The method according to claim 4, characterized in that, The step of calculating the deviation between the voltage signal and the preset reference voltage signal includes: The voltage signal is filtered. Calculate the deviation between the filtered voltage signal and the preset reference voltage signal.

9. A device for detecting damage to the sheath of a drive shaft, characterized in that, The device includes: A monitoring module is used to monitor the medium parameters of the lubricating medium in the medium-containing space of the target sheath via a flexible sensor; wherein the flexible sensor is built into the medium-containing space of the target sheath. The response module is used to determine the capacitance change response when the monitored medium parameters change. The output module is used to determine the damage status of the target sheath based on the capacitance change response.

10. A drive shaft sheath damage detection system, characterized in that, The system is configured with the apparatus of claim 9 for performing the method of any one of claims 1-8.

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