A new energy vehicle electric drive assembly oil circuit abrasive particle detection device and method

Abstract

The present application relates to the technical field of oil online monitoring and electromechanical equipment state monitoring, in particular to a new energy vehicle electric drive assembly oil circuit abrasive particle detection device and method, comprising a clippable permanent magnet differential excitation assembly for establishing an axial background magnetic field in a detection area; an axial interval and detection area limiting assembly for limiting the axial position relationship of the magnet group relative to the center of the detection area; a six-channel radial induction coil array assembly for collecting the radial magnetic flux change caused by the abrasive particles passing through the detection area and outputting the corresponding channel induction voltage signal; a magnetic isolation assembly for suppressing external magnetic interference and reducing the influence of permanent magnet leakage on the non-detection area; a six-channel acquisition circuit and output assembly for signal conditioning and synchronous sampling of the six-channel induction voltage signal and outputting abrasive particle event information; the present application is suitable for long-term online monitoring of new energy vehicle electric drive assembly lubricating oil circuit and other scenes.

Description

Technical Field

[0001] This invention relates to the field of online oil monitoring and electromechanical equipment condition monitoring technology, specifically to a device and method for detecting wear particles in the oil circuit of an electric drive assembly for new energy vehicles. Background Technology

[0002] Lubricating oil is widely used in rotating machinery systems such as gear drives, rolling bearings, and integrated motor reduction assemblies, primarily for friction reduction, cooling, and carrying away wear products. During equipment operation, early failures such as pitting, scratches, fatigue spalling, and wear from foreign objects in the assembly typically manifest first as changes in the number and size distribution of metal abrasive particles in the oil. Therefore, online monitoring of oil abrasive particles can obtain critical wear information without disassembling the equipment, making it an important technical means for condition monitoring, fault early warning, and life assessment. Taking the electric drive system of new energy vehicles as an example, its high speed, integration, and compact layout make lubrication conditions more sensitive, while also placing higher demands on system reliability and maintenance convenience, thus highlighting the need for online detection of oil abrasive particles.

[0003] Currently, oil abrasive detection technologies mainly include magnetic plug or magnetic rod adsorption detection, optical, resistive, and capacitive particle counting detection, and electromagnetic induction detection. Magnetic plug methods are simple in structure, but are mostly offline or quasi-online, making it difficult to provide continuous, quantitative information. Optical and electrical methods are sensitive to oil transparency, bubbles, moisture, and contaminants, and are prone to misjudgment in complex oil environments, with high maintenance costs. Electromagnetic induction methods are sensitive to metal particles and can adapt to turbid oil environments, thus receiving widespread research and application.

[0004] In electromagnetic induction abrasive particle detection, a common structure uses an excitation coil to generate an alternating magnetic field, and then an induction coil to collect the magnetic flux disturbance signal caused by the passage of abrasive particles. This type of solution typically requires an external AC excitation current, leading to power consumption and heat generation issues. Furthermore, in environments with strong electromagnetic interference, such as those involving new energy vehicles, the excitation and acquisition links are susceptible to inverter switching noise, common-mode interference, and wiring harness coupling, placing higher demands on circuit design and shielding. In addition, traditional single-channel or axial acquisition methods are highly sensitive to eccentric particle flow within the pipe cross-section and lack channel direction information, resulting in insufficient robustness under conditions of installation posture changes, oil circuit vibration, or multi-source interference. On the other hand, some sensors require cutting and modifying the oil circuit or being connected in series, increasing assembly complexity and leakage risks, making it difficult to meet the requirements of long-term online monitoring and convenient maintenance at the vehicle end.

[0005] Therefore, there is an urgent need for an online oil wear particle detection device and method that can be quickly clamped and deployed without changing the original oil circuit structure, does not require high-power AC excitation, has strong anti-electromagnetic interference capability, can improve detection robustness through multi-channel acquisition, and has directional characterization capability, so as to meet the long-term online monitoring needs of scenarios such as electric drive systems of new energy vehicles. Summary of the Invention

[0006] To address the problems of large installation and modification requirements, need for external high-power AC excitation, and insufficient robustness of single-channel axial acquisition to eccentric flow and attitude changes in existing online oil wear detection solutions, this invention proposes a wear detection device and method for the oil circuit of electric drive assembly in new energy vehicles.

[0007] In a first aspect, a wear detection device for the oil circuit of an electric drive assembly in a new energy vehicle includes:

[0008] A clampable permanent magnet differential excitation assembly is used to establish an axial background magnetic field in the detection area; it includes two magnet groups, and each magnet group is composed of an upper half-ring permanent magnet and a lower half-ring permanent magnet assembled together to form a ring-shaped closed structure.

[0009] An axial spacing and detection area defining component is used to define the axial positional relationship of the two magnet groups relative to the center of the detection area, so as to ensure the repeatability of the detection area position and its corresponding background magnetic field distribution; it includes two defining components.

[0010] A six-channel radial induction coil array assembly is used to collect the radial magnetic flux change caused by abrasive particles passing through the detection zone and output the induced voltage signal of the corresponding channel; it includes six sets of induction coils evenly distributed along the circumference, with the center azimuth angle of two adjacent sets of induction coils being 60° apart;

[0011] Magnetic shielding components are used to suppress external magnetic interference and reduce the impact of permanent magnet leakage on non-detection areas;

[0012] The six-channel acquisition circuit and output components are used to condition and synchronously sample the six-channel induced voltage signals and output abrasive event information.

[0013] In a second aspect, a method for detecting abrasive particles in the oil circuit of a new energy vehicle electric drive assembly is provided, employing a new energy vehicle electric drive assembly oil circuit abrasive particle detection device as described in the first aspect, comprising:

[0014] S1. Install a wear detection device for the oil circuit of the electric drive assembly of new energy vehicles on the outer circumferential surface of the pipe corresponding to the detection area. The specific distribution of the components is as follows:

[0015] Six sets of induction coils are evenly attached to the outer circumferential surface of the pipe corresponding to the detection area. All induction coils are located on the axial section at the center of the detection area and are symmetrically distributed with respect to the longitudinal section at the center of the detection area. The center azimuth angle between two adjacent sets of induction coils is 60°, and the normal direction of each set of induction coils is set radially.

[0016] Two magnet groups are respectively arranged on the front and rear sides of the induction coil along the axial direction of the pipe; the magnetic poles of the two magnet groups have the same polarity on the side near the detection area, thereby forming an axially differential background magnetic field in the detection area; wherein, a limiting component is provided on the side of each magnet group near the detection area to constrain the axial distance between the two magnet groups.

[0017] A magnetic shielding assembly is arranged on the outside of the magnet group and / or the six sets of induction coils;

[0018] Six sets of induction coils are each electrically connected to one channel, and the six channels are all connected to a synchronous sampling analog-to-digital conversion unit.

[0019] S2. Obtain baseline information for six channels under abrasive-free operating conditions;

[0020] S3. During the detection process, the induced voltage signals of six channels are acquired simultaneously; each channel performs baseline subtraction or drift correction on the acquired induced voltage signal based on its own baseline information to obtain the correction channel signal; based on the correlation response formed on the circumferential multi-channels when the same abrasive particle passes through the detection area, the six correction channel signals are subjected to multi-channel consistency verification. If the verification passes, abrasive particle event information is output; the abrasive particle event information includes at least the event occurrence time, the effective response channel number, and the channel response characteristics.

[0021] The beneficial effects of this invention are:

[0022] This invention employs a clampable permanent magnet differential excitation component, an axial spacing and detection area defining component, and a magnetic shielding component in combination. Without cutting or connecting to the existing pipeline, it achieves rapid installation and stable positioning of the detection device outside the target pipe section, and can form a spatially stable and repeatably distributed axial background magnetic field within the detection area. Compared to schemes using AC excitation coils, this invention eliminates the need for external high-power AC excitation, reducing power consumption and heat generation, and minimizing coupling interference introduced by the excitation link. Simultaneously, the magnetic shielding design further reduces the impact of the strong electromagnetic environment of new energy vehicles on the detection process, thus balancing convenient deployment, low-power operation, and anti-interference capabilities. Furthermore, this invention utilizes a six-channel radial induction coil array located on the same detection cross-section, combined with multi-channel synchronous acquisition and consistency verification, enabling the same abrasive grain passage event to generate correlated response signals on multiple circumferential channels. This structure not only reduces single-channel false triggering and improves detection robustness under complex working conditions by utilizing multi-channel correlation responses, but also allows the response differences between channels in different orientations to characterize the circumferential bias trend of abrasive particles when they undergo eccentric flow, attitude changes, or vibration disturbances. Therefore, this invention is not a simple parallel combination of clamping structures, permanent magnet excitation structures, and multi-channel acquisition structures, but rather achieves synergistic technical effects of low power consumption, easy deployment, anti-interference, and enhanced multi-channel detection through the cooperation of its components. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the wear particle detection device for the oil circuit of the electric drive assembly of a new energy vehicle according to the present invention;

[0024] Figure 2 This is a schematic diagram of the axial arrangement of the permanent magnet differential excitation and detection area of ​​the present invention;

[0025] Figure 3 This is a schematic diagram of the radial cross-section and circumferential distribution of the induction coil array of the present invention;

[0026] Figure 4 This is a flowchart of the six-channel acquisition circuit of the present invention;

[0027] Figure 5 This is a schematic waveform diagram of the six-channel output signal of the abrasive particles along the pipe axis according to the present invention;

[0028] Figure 6 This is a schematic waveform diagram of the six-channel output signal under the condition of abrasive grain eccentricity according to the present invention;

[0029] Among them, 1-clampable permanent magnet differential excitation component, 2-axial spacing and detection area limiting component, 3-six-channel radial induction coil array component, 4-magnetic shielding component, 5-six-channel acquisition circuit and output component, 6-pipe. Detailed Implementation

[0030] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This invention provides a device and method for detecting abrasive particles in the oil circuit of an electric drive assembly for new energy vehicles. It is suitable for online monitoring of metal abrasive particles in the pipeline medium of the lubrication oil circuit, reducer lubrication oil circuit, or oil cooling circulation pipeline of the electric drive assembly for new energy vehicles.

[0032] Example 1

[0033] Please see Figure 1 A wear detection device for the oil circuit of an electric drive assembly in a new energy vehicle, specifically comprising:

[0034] The clampable permanent magnet differential excitation assembly 1 is used to establish an axial background magnetic field in the detection area; it includes two magnet groups, and each magnet group is composed of an upper semi-circular permanent magnet and a lower semi-circular permanent magnet assembled together to form a ring-shaped closed structure.

[0035] Axial spacing and detection area defining component 2 is used to define the axial positional relationship between the two magnet groups relative to the center of the detection area, so as to ensure that the position of the detection area and its corresponding background magnetic field distribution are symmetrical; it includes two defining components, and each defining component is assembled by upper and lower defining parts to form a ring-shaped closed structure.

[0036] The six-channel radial induction coil array assembly 3 is used to collect the radial magnetic flux change caused by abrasive particles passing through the detection zone and output the induced voltage signal of the corresponding channel; it includes six sets of induction coils evenly distributed along the circumference, with the center azimuth angle of two adjacent sets of induction coils being 60° apart.

[0037] The magnetic shielding component 4 is used to suppress external magnetic interference and reduce the impact of permanent magnet leakage magnetic field on non-detection areas, so as to improve the stability and consistency of online monitoring; it includes upper and lower magnetic shielding shells.

[0038] The six-channel acquisition circuit and output component 5 are used to perform signal conditioning and synchronous sampling of the six-channel induced voltage signals, and output abrasive event information.

[0039] Preferably, the permanent magnet material may be one or a combination of neodymium iron boron, samarium cobalt, ferrite, alnico, or bonded neodymium iron boron. Other permanent magnet materials that can provide the desired remanence and temperature resistance may also be selected.

[0040] Preferably, the axial spacing and detection area defining component is used in conjunction with the permanent magnet differential excitation component. The axial spacing and detection area defining component is preferably made of a non-magnetic material whose influence on the magnetic field is negligible, with a relative permeability close to 1, and is preferably an electrically insulating or low-conductivity material to avoid significantly disturbing the background magnetic field of the detection area or introducing eddy current interference. Exemplary materials include, but are not limited to: PEEK, PPS, PTFE, nylon, epoxy fiberglass board (FR-4), alumina ceramic, quartz glass, etc.

[0041] Preferably, the limiting component is selected from one or more combinations of limiting steps, spacer rings, and connecting beams. For example, if a spacer ring is selected as the limiting component, the limiting component consists of upper and lower half-rings, which can be closed to form a complete spacer ring.

[0042] Preferably, the induction coil is a wound rectangular coil, a printed circuit board planar coil, or a flexible substrate coil.

[0043] Preferably, the magnetic shielding component includes one or more combinations of a high permeability shielding component, a magnetic conductive component, and a magnetic shielding gap structure.

[0044] Preferably, the six-channel acquisition circuit and output component includes six channels, each channel including at least a preamplifier unit and a filter unit; the six channels are connected to a synchronous sampling analog-to-digital converter unit.

[0045] Example 2

[0046] This invention proposes a method for detecting wear particles in the oil circuit of an electric drive assembly in new energy vehicles. The method employs a wear particle detection device for the oil circuit of an electric drive assembly in new energy vehicles as described in Example 1, comprising:

[0047] S1. Install a wear detection device for the oil circuit of the electric drive assembly of new energy vehicles on the outer circumferential surface of the pipe corresponding to the detection area. The specific distribution of the components is as follows:

[0048] Six sets of induction coils are evenly attached to the outer circumferential surface of the pipe corresponding to the detection area. All induction coils are located on the axial section at the center of the detection area and are symmetrically distributed with respect to the longitudinal section at the center of the detection area. The azimuth angle between the centers of two adjacent sets of induction coils is 60°, and the normal direction of each set of induction coils is set radially. Figure 3 As shown;

[0049] Along the axial direction of the pipe, a magnet assembly is positioned on each side of the induction coil, one before and one after. The two magnet assemblies have the same magnetic polarity on the side closest to the detection area, thus creating an axially differential background magnetic field in the detection area. A limiting component is provided on the side of each magnet assembly closest to the detection area to constrain the axial distance between the two magnet assemblies, such as... Figure 2 As shown;

[0050] A magnetic shielding assembly is arranged on the outside of the magnet group and / or the six sets of induction coils;

[0051] Six sets of induction coils are each electrically connected to one channel, and the six channels are all connected to a synchronous sampling analog-to-digital conversion unit.

[0052] Preferably, the wear detection device for the oil circuit of the electric drive assembly of new energy vehicles adopts a split clamping structure, consisting of two openable components, namely an upper component and a lower component. Both the upper and lower components include a housing and functional components pre-installed inside the housing. The functional components include at least two semi-annular permanent magnets and three induction coils.

[0053] It is important to note that the components of this detection device are not installed individually on the outer wall of the pipe, but are pre-assembled into the corresponding mounting cavities of the outer shell, forming a clamping assembly that can be opened and closed as a whole. During on-site assembly, the lower half of the assembly is first placed below the pipe, and then the upper half of the assembly is placed on top of the pipe. The upper and lower outer shells are then locked in place by the external fastening structure, thus completing the installation and fixation of the device on the outside of the pipe.

[0054] Preferably, the outer casing is a split-type assembly extending along the pipe's axial direction, and the overall casing can be composed of two semi-circular shells. One side of the two semi-circular shells is connected by a hinge, while the other side is detachably connected using fastening structures such as bolts, clips, locks, or clamps. After the upper and lower shells are fastened together, an installation channel is formed for the pipe to pass through, and radial clamping force is applied through the fastening structures to stably fix the entire device to the outside of the pipe. If necessary, an elastic pad, spacer ring, or limiting gasket can be added between the outer casing and the pipe to improve clamping stability and ensure the relative positional accuracy between the functional components and the pipe.

[0055] Furthermore, the upper and lower semi-annular permanent magnets in the magnet assembly are respectively installed in the corresponding magnet mounting cavities of the upper and lower outer shells. The magnet mounting cavities can radially and axially limit the permanent magnets through the cavity sidewalls, end shoulders, limiting bosses, or clamping blocks, and can be used in conjunction with interference fits, adhesive bonding, potting, or pressure plate fixing to ensure that the permanent magnets maintain their preset positions during installation and use, rather than relying on direct adsorption onto the pipe surface after closing.

[0056] Furthermore, six sets of induction coils are distributed circumferentially along the pipe and pre-installed in coil mounting positions arranged circumferentially within the upper and lower outer shells. These coil mounting positions can be recessed slots, positioning cavities, or mounting windows that match the coil's shape. After the induction coils are installed, they can be fixed using methods such as sidewall positioning of the mounting slot, clamping with pressure strips, compression by limiting blocks, interference fit, adhesive bonding, or potting. In this way, the six sets of induction coils do not need to be installed individually on the outer wall of the pipe; instead, after the upper and lower outer shells are closed, they are positioned together with the overall clamping structure at predetermined positions around the pipe.

[0057] Preferably, the limiting component cooperates with the magnet assembly to constrain the positional relationship between the magnet assembly and the induction coil relative to the pipe. The limiting component can be a spacer ring, a limiting block, a gasket, or a combination thereof, and can be pre-installed in corresponding limiting grooves on the inner sides of the upper and lower housings, or disposed between the housing and the pipe. After the housing is locked, the limiting component is pressed into a predetermined position under clamping force, thereby stably constraining the installation distance and relative orientation of the internal magnet assembly and the induction coil.

[0058] In one specific embodiment, the installation sequence of this device is as follows: First, the permanent magnet, induction coil, and limiting components are pre-installed in the corresponding mounting positions of the upper and lower housings, forming an upper half assembly and a lower half assembly. During installation, the lower half assembly is placed under the pipe to be measured, allowing the pipe to enter its inner clearance space. Then, the upper half assembly is placed over the pipe, and the upper and lower housings are aligned. Subsequently, the upper and lower housings are locked together using fasteners such as bolts, clips, locks, or clamps. After locking, the internal permanent magnet, induction coil, and limiting components are stably positioned along with the housing as a whole, thus completing the rapid clamping of the device. Then, a magnetic shielding component is arranged on the outside of the magnet group and / or the six sets of induction coils, so that each of the six sets of induction coils is electrically connected to one channel, and the six channels are connected to a synchronous sampling analog-to-digital conversion unit. This installation method eliminates the need for cutting, connecting, or disassembling the pipe, enabling rapid assembly and disassembly.

[0059] S2. Obtain baseline information for six channels under abrasive-free operating conditions.

[0060] S3. During the detection process, induced voltage signals from six channels are simultaneously acquired; each channel performs baseline subtraction or drift correction on the acquired induced voltage signal based on its own baseline information to obtain a corrected channel signal; then, a multi-channel consistency check is performed. If the check passes, abrasive event information is output; the abrasive event information includes at least the event occurrence time, the valid response channel number, and the channel response characteristics, such as... Figure 4 As shown.

[0061] Preferably, the multi-channel consistency check includes:

[0062] When the correction channel signal of a certain channel meets the event determination condition, the channel is recorded as a candidate response channel, and a preset time window is established based on its trigger time; the event determination condition is: the amplitude or change of the correction channel signal exceeds a preset threshold.

[0063] Within a preset time window, check whether the other channels also meet the event determination conditions. If two or more channels meet the event determination conditions at the same time, it is determined that an abrasive event has occurred. If only a single channel meets the event determination conditions, it is determined to be an interference signal or an invalid response. After confirming that an abrasive event has occurred, further extract and output the abrasive event information.

[0064] This invention employs a permanent magnet differential excitation method to create a static background magnetic field dominated by the axial component in the detection zone. When metal abrasive particles flow through the detection zone with the oil, they undergo a magnetic response under the influence of the background magnetic field, causing local magnetic field disturbances. Since the position of the abrasive particles within the detection zone changes over time, this disturbance further causes dynamic changes in the radial magnetic flux at different circumferential orientations within the detection zone. A six-channel radial induction coil array is uniformly arranged along the circumference, and the six sets of induction coils are located at different circumferential orientations on the same detection cross-section, with their respective normal directions all radially positioned. Therefore, the event of the same abrasive particle passing through can be converted into six induced voltage signals with time correlation and spatial differences. Specifically, when the abrasive particle passes through the detection zone along the central region of the pipe, the responses of the six channels can be consistent or approximately consistent due to the essentially uniform circumferential positional relationship relative to each channel; when the abrasive particle passes eccentrically within the pipe cross-section, the outputs of each channel will exhibit differentiated responses due to the varying degrees of coupling between the abrasive particle and different circumferential channels. Based on this, the multi-channel consistency verification in this invention is not a signal discrimination step set separately from the sensing structure, but rather an event confirmation mechanism built on the aforementioned six-channel correlation response: on the one hand, it can utilize the correlation response of the same abrasive event on multiple channels to suppress occasional interference in a single channel, improving the detection reliability under complex working conditions; on the other hand, it can utilize the response differences between channels in different orientations to provide a basis for characterizing the abrasive eccentricity state or circumferential bias trend. Thus, the permanent magnet differential background field, the circumferential six-channel radial sensing structure, and the multi-channel consistency verification form a mutually supportive overall detection mechanism, rather than a simple superposition of independent components.

[0065] In one embodiment, for ease of description, the orientations of the six sets of induction coils are uniformly numbered. Let the central axis of the k-th, 1st, 2nd, ..., 6th induction coil be located at angle θ. k If:

[0066]

[0067] The above definition corresponds to a six-part circumferential arrangement, used to describe the differences in the "direction" of each channel. Based on this, the induced voltage of a single channel is given by Faraday's law of electromagnetic induction, that is, the more turns the coil has and the faster the change in magnetic flux through the coil, the greater the output voltage.

[0068] Since this invention uses a permanent magnet as the excitation source, it is necessary to distinguish between the "static background field" and the "disturbance field caused by abrasive particles." The magnetic field at any location within the detection area can be expressed as a superposition of the two:

[0069]

[0070] in The static background magnetic field formed by permanent magnet differential excitation; This refers to the local disturbance magnetic field generated by the abrasive particles under the influence of the background magnetic field. denoted by , r represents the instantaneous position of the abrasive grain as it flows with the oil, and r represents the position vector of any point in space.

[0071] The magnetic flux of the k-th induction coil is calculated using the surface integral over the effective area of ​​the coil:

[0072]

[0073] Among them, A k Let n be the effective area of ​​the k-th induction coil. k This represents the normal direction of the k-th induction coil (the radial direction of the flow channel in this embodiment). Since this invention uses permanent magnets to form a static background field, the above equation can be understood as the magnetic flux determined jointly by the background magnetic field term and the abrasive particle disturbance term; where the magnetic flux corresponding to the background magnetic field can ideally be considered as a baseline constant, while the disturbance magnetic field caused by the abrasive particles passing through the detection zone varies with the position of the abrasive particles. Change, making It generates a measurable dynamic change, which is then converted into a channel induced voltage output.

[0074] because In an ideal static state, when the coil is fixed, its corresponding magnetic flux is a constant term. Online detection mainly focuses on... Changes in magnetic flux caused by abrasive grain movement:

[0075]

[0076] Therefore, the output voltage of the k-th channel can be equivalently understood as a representation of the rate of change of the disturbance magnetic flux:

[0077]

[0078] Where N k Let k be the number of turns of the k-th induction coil. Let be the change in magnetic field sensed by the k-th induction coil.

[0079] When the abrasive grains move along the axial direction, the distribution of the disturbance magnetic field changes accordingly, which causes the magnetic flux of each channel to exhibit time-varying characteristics and generate induced voltage output. At the same time, since the channels are in different orientations and the coil normal is radial to the flow channel, when the abrasive grains move in a biased direction, the disturbance magnetic flux contribution of different channels to the same abrasive grains is different, thus forming the basis for the orientation difference response of the six channels.

[0080] In one embodiment, to verify the output difference of the above-mentioned six-channel radial induction structure under axial and eccentric passage conditions, this embodiment uses ANSYS Maxwell electromagnetic field simulation software to verify the magnetic field and induced voltage response in the detection area. A three-dimensional model consistent with the structure of this invention is established in the simulation: the pipe inner diameter is 3 mm, and a centrally symmetrical and identically polarized annular permanent magnet differential excitation structure is arranged on both sides of the axial direction, with a 12 mm distance between the outer end faces of the permanent magnets on both sides; six sets of radial induction coils are evenly arranged at 60° around the outer periphery of the detection area, and each coil is set as a thick coil model with 500 turns per set. The abrasive particles are set as 0.4 mm diameter iron abrasive particles, passing through the detection area along the pipe axial direction; by changing the position of the abrasive particles within the pipe cross-section, the six-channel induced voltage output waveforms under the two conditions of central axis passage and eccentric passage are obtained respectively, and the results are as follows. Figure 5 and Figure 6 As shown.

[0081] like Figure 5 As shown, when the abrasive particles pass through the detection zone along the central axis of the pipe, due to the axial symmetry of the structure and magnetic field distribution, the induced voltage waveforms obtained by the six channels under ideal conditions are consistent or approximately consistent.

[0082] like Figure 6 As shown, when abrasive particles pass eccentrically through the pipe cross-section (e.g., at the midpoint between the central axis and the pipe wall), the coupling strength of the perturbation magnetic flux varies in different azimuth channels, and the induced voltage waveforms of the six channels show differences or inconsistencies, which can be used to characterize the eccentric orientation features.

[0083] Based on the aforementioned device structure and working principle, this method achieves continuous acquisition and information output of abrasive events without altering the original pipeline structure. This method does not rely on complex signal processing inference; its core lies in establishing a stable signal baseline, synchronously acquiring a six-channel induced voltage sequence, and determining abrasive events based on the deviation of each channel voltage from the baseline and the consistency of the multi-channel responses.

[0084] Example 3

[0085] The following provides application examples of the present invention in new energy vehicle scenarios to illustrate the deployment method and output content of the device in the vehicle's fuel system. It should be noted that these application examples are merely illustrative of the applicable scenarios of the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0086] In the electric drive assembly of new energy vehicles, the gear pairs, bearings, and related transmission components of the reducer may generate metal abrasive particles of different sizes and materials during long-term operation. These abrasive particles enter the oil circuit with the lubricating oil circulation. To achieve online monitoring of abrasive particles, the device of this invention can be deployed on the outer periphery of the target pipe section of the lubricating oil circuit of the electric drive assembly in a clamping manner. For example, it can be arranged in the main pipe section between the oil pump outlet and the lubrication branch, the return oil confluence section, or one of the adjacent pipe sections before and after the filter. During installation, the device is sleeved on the outside of the target pipe section by closing the upper and lower halves, without the need to cut or connect the oil pipe. The clamping permanent magnet differential excitation component establishes an axial background magnetic field on both sides of the detection area. The six-channel radial induction coil array component is uniformly distributed along the circumference of the detection area to collect the radial magnetic flux disturbance caused by abrasive particles passing through the detection area. The magnetic shielding component is used to suppress the interference of the strong electromagnetic environment on the vehicle, such as the motor, inverter, and high-voltage wiring harness, on the detection area. The six-channel acquisition circuit and output component synchronously acquire the six-channel induced voltage and output the corresponding abrasive particle event information.

[0087] During vehicle operation, when abrasive particles flow through the detection area with the oil, each channel will exhibit a transient voltage response corresponding to the abrasive particle event. The output abrasive particle event information may include: the time of event occurrence, the trigger channel number, the response amplitude of each channel, and its distribution characteristics across the six channels. Since the six channels are uniformly arranged circumferentially, the channel responses in different orientations may differ when the abrasive particles flow eccentrically or pass close to a certain side wall. The device can then output the orientation characterization result of the abrasive particle event or the main response orientation channel information to assist in determining the cross-sectional position trend when the abrasive particles pass through. This information can be used for assessing the lubrication status of the electric drive assembly, providing early warning of wear anomalies, and formulating maintenance strategies, thereby improving the operational reliability and maintainability of the new energy vehicle powertrain.

[0088] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wear detection device for the oil circuit of an electric drive assembly in a new energy vehicle, characterized in that, include: Clampable permanent magnet differential excitation assembly for establishing an axial background magnetic field in the detection area; It includes two magnet groups, and each magnet group is composed of an upper semi-circular permanent magnet and a lower semi-circular permanent magnet assembled together to form a closed, embracing structure. An axial spacing and detection area defining component is used to define the axial positional relationship between the two magnet groups relative to the center of the detection area, so as to ensure that the detection area position and its corresponding background magnetic field distribution are symmetrical; it includes two defining components. A six-channel radial induction coil array assembly is used to collect the radial magnetic flux change caused by abrasive particles passing through the detection zone and output the induced voltage signal of the corresponding channel; it includes six sets of induction coils evenly distributed along the circumference, with the center azimuth angle of two adjacent sets of induction coils being 60° apart; Magnetic shielding components are used to suppress external magnetic interference and reduce the impact of permanent magnet leakage on non-detection areas; The six-channel acquisition circuit and output components are used to condition and synchronously sample the six-channel induced voltage signals and output abrasive event information.

2. The wear detection device for the oil circuit of a new energy vehicle electric drive assembly according to claim 1, characterized in that, The permanent magnet material is selected from one or more combinations of neodymium iron boron, samarium cobalt, ferrite, alnico, or bonded neodymium iron boron.

3. The wear particle detection device for the oil circuit of a new energy vehicle electric drive assembly according to claim 1, characterized in that, The limiting component is selected from one or more combinations of limiting steps, spacer rings, and connecting beams, and is made of non-magnetic material.

4. The wear particle detection device for the oil circuit of a new energy vehicle electric drive assembly according to claim 1, characterized in that, The induction coil is a wound rectangular coil, a printed circuit board planar coil, or a flexible substrate coil.

5. The wear particle detection device for the oil circuit of a new energy vehicle electric drive assembly according to claim 1, characterized in that, The magnetic shielding component includes one or more combinations of a high permeability shielding component, a magnetic conductive component, and a magnetic shielding gap structure.

6. The wear particle detection device for the oil circuit of a new energy vehicle electric drive assembly according to claim 1, characterized in that, The six-channel acquisition circuit and output components include six channels, each channel including at least a preamplifier unit and a filter unit; the six channels are connected to a synchronous sampling analog-to-digital converter unit.

7. A method for detecting abrasive particles in the oil circuit of an electric drive assembly for new energy vehicles, characterized in that, The wear detection device for the oil circuit of a new energy vehicle electric drive assembly as described in any one of claims 1-6 includes: S1. Install a wear detection device for the oil circuit of the electric drive assembly of new energy vehicles on the outer circumferential surface of the pipe corresponding to the detection area. The specific distribution of the components is as follows: Six sets of induction coils are evenly attached to the outer circumferential surface of the pipe corresponding to the detection area. All induction coils are located on the axial section at the center of the detection area and are symmetrically distributed with respect to the longitudinal section at the center of the detection area. The center azimuth angle between two adjacent sets of induction coils is 60°, and the normal direction of each set of induction coils is set radially. Two magnet groups are respectively arranged on the front and rear sides of the induction coil along the axial direction of the pipe; the magnetic poles of the two magnet groups have the same polarity on the side near the detection area, thereby forming an axially differential background magnetic field in the detection area; wherein, a limiting component is provided on the side of each magnet group near the detection area to constrain the axial distance between the two magnet groups. A magnetic shielding assembly is arranged on the outside of the magnet group and / or the six sets of induction coils; Six sets of induction coils are each electrically connected to one channel, and the six channels are all connected to a synchronous sampling analog-to-digital conversion unit. S2. Obtain baseline information for six channels under abrasive-free operating conditions; S3. During the detection process, the induced voltage signals of six channels are acquired simultaneously; each channel performs baseline subtraction or drift correction on the acquired induced voltage signals according to its own baseline information to obtain the correction channel signal; based on the correlation response formed on the circumferential multi-channels when the same abrasive particle passes through the detection area, the six correction channel signals are subjected to multi-channel consistency verification; when the verification passes, abrasive particle event information is output, which includes at least the event occurrence time, the effective response channel number, and the channel response characteristics.

8. The method for detecting wear particles in the oil circuit of a new energy vehicle electric drive assembly according to claim 1, characterized in that, The induction coil has a rectangular curved structure, with its coil plane tangent to the outer circumferential surface of the pipe. The long side extends along the axial direction of the pipe, and the short side is arranged tangentially along the circumference of the pipe, so that the normal direction of the effective area of ​​the induction coil is set radially.

9. The method for detecting abrasive particles in the oil circuit of a new energy vehicle electric drive assembly according to claim 1, characterized in that, Multi-channel consistency verification includes: When the correction channel signal of a certain channel meets the event determination condition, the channel is recorded as a candidate response channel, and a preset time window is established based on its trigger time; the event determination condition is: the amplitude or change of the correction channel signal exceeds a preset threshold. If two or more channels simultaneously meet the event determination conditions within a preset time window, then an abrasive event is determined to have occurred.

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