Non-contact magnetic force induction wide-working-condition integrated protection engine oil measurement assembly

Abstract

The utility model discloses a non -contact type magnetic force response wide working condition integrated protection engine oil quantity measurement assembly for improving the precision, stability and the ability of adapting complex working condition of engine oil quantity measurement. The assembly includes fixed mechanism, rotating mechanism, magnetic force generating part, position response mechanism, sealing mechanism, connecting transmission mechanism and other core components, and through the rotation of the rotating mechanism driven by the float with the oil level, the magnetic force generating part synchronously rotates to generate variable magnetic field, the position response mechanism converts the magnetic field change into electric signal, and the electric signal is transmitted to the engine control unit through shielding transmission link to complete oil quantity conversion. The scheme adopts double sealing structure to realize reliable oil isolation, is equipped with static electricity release component to release static electricity, and through the anti -loose fastening assembly and spherical joint improve structural stability and measurement adaptability. The assembly structure is compact, adapts to the existing engine installation platform, can effectively inhibit electromagnetic interference, and guarantees the measurement precision and service life under complex driving posture and vibration working condition.

Description

Technical Field

[0001] This invention relates to the field of engine oil level detection technology, specifically to a high-precision, long-life, non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly based on a non-contact magnetic induction structure. Background Technology

[0002] In general-purpose gasoline engine, automobile, and motorcycle engine oil level monitoring systems, traditional solutions primarily use contact-type resistance sensing structures. A float moves a sliding contact across a resistive element, and changes in resistance are used to calculate oil level data. However, this structure has inherent drawbacks: long-term friction between the contact and the resistive element can lead to wear and oxidation; impurities in the oil can also cause surface contamination, resulting in poor contact and resistance drift. Ultimately, this leads to decreased measurement accuracy, signal fluctuations, and a short service life, making it unsuitable for highly corrosive oils such as methanol.

[0003] To address the drawbacks of contact-based systems, various non-contact oil level measurement solutions have been developed in the industry, but the following technical problems still exist:

[0004] Optical measurement solutions (such as laser triangulation and plastic fiber sensing) can achieve non-contact detection, but they are complex in structure, have high cost, have strict requirements for installation space and environmental cleanliness, and are easily affected by changes in the refractive index of oil, making them unsuitable for complex operating conditions such as engine vibration and high temperature.

[0005] Capacitive measurement schemes rely on changes in the dielectric constant of the medium to achieve detection. Temperature fluctuations can significantly affect measurement accuracy, and metal electrodes are easily corroded by electrolysis. Improper sealing structure design can also lead to leakage risks. In addition, they cannot be adapted to high-viscosity oils.

[0006] Although magnetostrictive measurement methods have high accuracy, they are weak against strong magnetic field interference. External magnetic fields can easily distort the distribution of internal magnetic fields, leading to signal distortion. Furthermore, the signal transmission process is susceptible to electromagnetic and radio frequency interference, limiting its applicability.

[0007] While existing magnetic induction-based (such as Hall effect) solutions avoid contact wear, they suffer from structural redundancy and complex assembly. Some designs using potting compound for sealing are prone to leaks due to gaps caused by drastic temperature and pressure changes. Furthermore, they lack effective anti-interference design, making the signal susceptible to electromagnetic radiation from engine operating conditions. Additionally, they do not adequately consider the issues of electrostatic discharge and loose connections under vibration conditions, which affect long-term reliability.

[0008] In addition, most existing non-contact solutions are difficult to match with existing engine mounting platforms, have poor adaptability, and lack measurement stability under conditions such as oil level tilt and severe vibration, failing to meet the requirements of high precision, long life and adaptability to complex working conditions. Utility Model Content

[0009] In view of this, the present invention provides a non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly, which simultaneously improves measurement accuracy, sealing reliability, anti-interference capability and service life, while simplifying the structure and improving assembly adaptability, in order to partially or completely solve the above problems.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] Non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly, including:

[0012] The fixing mechanism is used to provide an installation reference and can be detachably fixed to a preset position on the engine, providing stable support for the overall structure;

[0013] The rotating mechanism is rotatably connected to the fixed mechanism and can convert changes in oil level into its own rotational displacement, thereby transmitting mechanical motion.

[0014] A magnetic force generator is mounted on the rotating mechanism and rotates synchronously with the rotating mechanism to form a variable magnetic field, providing a magnetic field source for non-contact induction.

[0015] The position sensing mechanism is fixed on the fixed mechanism and cooperates with the magnetic force generator in a non-contact manner. It can sense changes in the variable magnetic field and convert them into electrical signals, thereby realizing the conversion of magnetic field signals into electrical signals.

[0016] A sealing mechanism is provided at the mounting position between the fixing mechanism and the engine, and at the mating position between the fixing mechanism and the position sensing mechanism, to isolate the oil from the position sensing mechanism and prevent the oil from contaminating the sensing components;

[0017] The connection transmission mechanism is electrically connected to the position sensing mechanism to stably transmit electrical signals to the engine control unit, thereby realizing signal transmission and interaction.

[0018] Preferably, the fixing mechanism includes a fixing seat, which has a rotating shaft structure for assembling the rotating mechanism and an installation structure for positioning and fixing with the engine. The installation structure includes at least two mounting holes distributed along the outer periphery of the fixing seat. The area of ​​the fixing seat corresponding to the engine mounting surface is provided with a sealing groove to ensure a stable connection and sealing foundation between the fixing mechanism and the engine, and to adapt to existing engine mounting platforms.

[0019] Preferably, the rotating mechanism includes a rotor and a transmission rod. The rotor is rotatably coupled to the shaft structure of the fixed mechanism. One end of the transmission rod is fixedly connected to the rotor, and the other end is provided with a detachable connection structure for connecting the float. The rotor is provided with a mounting groove for fixing the magnetic force generator, realizing a reliable conversion of oil volume changes into rotational displacement. The rotating mechanism also includes a static discharge component, which can effectively release static electricity generated under operating conditions and avoid damage to electronic components caused by static electricity accumulation.

[0020] Preferably, the magnetic force generator is a permanent magnet, and the position sensing mechanism includes a sensing substrate and a position sensing chip. The position sensing chip is fixed on the sensing substrate and is positioned opposite to the sensing surface of the permanent magnet, with a gap of 0.5-5mm between them. The position sensing chip is a Hall effect chip or a magnetoresistive sensor chip to ensure the sensitivity and signal stability of the non-contact sensing. The circuit wiring of the sensing substrate includes a grounding loop and a filter capacitor mounting structure to further improve the signal anti-interference capability.

[0021] Preferably, the sealing mechanism includes a first seal and a second seal. The first seal is disposed between the mounting surface of the fixing mechanism and the engine, and the second seal is disposed between the fixing mechanism and the protective component of the position sensing mechanism. Both the first and second seals are oil-resistant elastic seals. This dual-sealing structure does not rely on potting compound, avoiding leakage problems caused by gaps in the potting compound due to thermal expansion and contraction, and forming a reliable oil isolation protection.

[0022] Preferably, the rotor is made of lightweight and wear-resistant plastic, and the transmission rod is made of stainless steel. The transmission rod has a reinforcing rib in the middle to enhance the structural strength, which takes into account the lightweight structure, corrosion resistance and deformation resistance, and adapts to the vibration conditions of the engine.

[0023] Preferably, the device also includes a fastening assembly, which is a screw or bolt, used to detachably fix the protective part of the rotating mechanism to the fixed seat. The fastening assembly has an anti-loosening structure, including anti-loosening threads and elastic washers, to prevent the connection from loosening due to vibration under operating conditions.

[0024] Preferably, the sensing substrate is a substrate with circuit wiring, the circuit wiring is provided with a grounding loop and a filter capacitor mounting structure, the grounding loop is electrically connected to the shielding layer of the transmission mechanism, which significantly improves the signal transmission stability and reduces external electromagnetic interference.

[0025] Preferably, the transmission rod is connected to the rotor by a thread and is axially fixed with a locking nut. The end of the transmission rod used to connect to the float is provided with a ball joint or a snap-fit ​​structure. The ball joint can adapt to the angular offset caused by the tilt of the oil surface and improve the measurement accuracy under complex driving postures.

[0026] Preferably, the connection and transmission mechanism includes a wire harness connector and a wire harness assembly. The wire harness connector is a waterproof connector, and the wire harness assembly includes multiple conductive core wires, a shielding layer, and an insulating sheath. The shielding layer is wrapped around the outside of the conductive core wires and grounded, effectively suppressing electromagnetic interference and radio frequency interference, and ensuring stable signal transmission.

[0027] The beneficial effects of this utility model are as follows:

[0028] 1. Through the coordinated operation of the fixing mechanism, rotating mechanism, magnetic force generating component, position sensing mechanism, sealing mechanism and connecting transmission mechanism, the non-contact magnetic induction principle is adopted, which completely avoids the contact wear and oil contamination problems of traditional contact structure, and solves the defect of measurement accuracy drift from the root.

[0029] 2. The dual oil-resistant sealing structure eliminates the need for potting compound, avoiding leakage problems caused by thermal expansion and contraction in existing sealing solutions. This significantly improves sealing reliability under complex operating conditions and extends the service life of electronic components.

[0030] 3. The grounding loop of the position sensing mechanism and the shielding layer of the connecting transmission mechanism form a collaborative anti-interference design, which effectively suppresses electromagnetic interference and radio frequency interference. Combined with the filter capacitor installation structure, it ensures stable signal transmission and solves the anti-interference shortcomings of existing non-contact solutions.

[0031] 4. The static discharge component of the rotating mechanism can release static electricity under working conditions, the anti-loosening fastening component is adapted to the engine vibration environment, and the ball joint design adapts to the oil level tilt, comprehensively improving the adaptability to complex working conditions.

[0032] In summary, this utility model features a simple overall structural design and convenient assembly, and can be matched with existing engine mounting platforms. The selection of lightweight and wear-resistant materials balances structural strength and service life. While ensuring high-precision measurement, it improves the consistency and reliability of mass production. It is suitable for oil quantity monitoring scenarios of various engines and highly corrosive oils, and has broad application prospects. Attached Figure Description

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, wherein:

[0034] Figure 1 This is a three-dimensional schematic diagram of this embodiment;

[0035] Figure 2 This is the front view of this embodiment;

[0036] Figure 3 for Figure 2 A sectional view along direction AA;

[0037] Figure 4This is a side view of this embodiment;

[0038] Figure 5 This is the rear view of this embodiment.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1-Fixed base; 2-First seal; 3-Rotor pressure plate; 4-Rotor end cover; 5-Fastener; 6-Rotor; 7-Transmission rod; 8-Sensing substrate; 9-Second seal; 10-Magnet; 11-Position sensing chip; 12-Wire harness connector; 13-Wire harness assembly; 14-Fixing mechanism; 15-Rotation mechanism; 16-Float.

[0041] Note: The accompanying drawings are for illustrative purposes only and are not intended to limit the specific dimensions and proportions of this invention. The part numbers correspond to the structure of specific embodiments to facilitate understanding of the technical solution. Detailed Implementation

[0042] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this utility model. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0043] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0044] like Figures 1-5 As shown, this embodiment discloses a non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly, including a fixing mechanism 14, a rotating mechanism 15, a magnetic force generator, a position sensing mechanism, a sealing mechanism, a connection and transmission mechanism, a static electricity conductive assembly, a fastening assembly, and protective components. The specific structure and function of each component are as follows:

[0045] The fixing mechanism provides an installation reference and can be detachably fixed to a preset position on the engine, providing stable support for the overall structure. The fixing mechanism includes a fixing base 1, which is an integrally molded rigid base that is compatible with existing engine mounting platforms; the fixing base has a sealing groove in the area corresponding to the engine mounting surface to ensure a stable connection and sealed foundation with the engine.

[0046] The rotating mechanism is rotatably connected to the fixed mechanism, used to convert changes in oil level into its own rotational displacement, thereby transmitting mechanical motion. The rotating mechanism includes a rotor 6, a transmission rod 7, and a static-dissipating component, namely a grounding spring. The rotor has a fan-shaped structure with a bushing at its center that mates with the rotating shaft structure of the fixed base 1. The bushing has a grooved mounting seat on its outer side, with anti-slip ribs on the inner wall of the groove. The mounting seat is used to assemble a magnetic force generator, and a grounding spring is mounted on its side. One end of the grounding spring contacts the rotor, and the other end is connected to the conductive structure of the fixed base 1 to achieve static discharge. The transmission rod is a rigid, slender rod with an external thread at one end, which connects to the threaded hole of the rotor 6 and is axially fixed by a lock nut. The other end has a ball joint or snap-fit ​​structure for detachably connecting to the float 16. The ball joint can adapt to the tilt angle of the oil level, improving the measurement accuracy under complex driving postures. A reinforcing rib is provided in the middle to enhance the structural strength.

[0047] In this embodiment, the rotor is made of lightweight and wear-resistant plastic material, and the transmission rod is made of stainless steel material, which takes into account the lightweight structure, corrosion resistance and deformation resistance, and adapts to the vibration conditions of the engine.

[0048] The transmission rod and rotor are connected by threads and axially fixed with a locking nut. The end connecting the float uses a ball joint to improve measurement accuracy under complex driving postures.

[0049] The magnetic force generator is located in the rotor groove of the rotating mechanism and is fixed by adhesive bonding. It is a permanent magnet, namely magnet 10, which rotates synchronously with the rotating mechanism to form a variable magnetic field, providing a magnetic field source for non-contact induction.

[0050] The position sensing mechanism is fixed on the fixed mechanism and cooperates non-contactly with the magnetic force generator to sense changes in the variable magnetic field and convert them into electrical signals. It includes a sensing substrate 8 and a position sensing chip 11. The sensing substrate 8 is a PCB substrate; copper circuit wiring is printed on the surface of the sensing substrate, and the wiring includes a grounding loop, filter capacitor pads, a pad matching the position sensing chip at one end, and a pin socket for connection to a wire harness connector at the other end. Positioning holes are set at the edges, and it is fixed to the inner positioning post of the fixed base 1 by screws. The grounding loop is electrically connected to the shielding layer of the transmission mechanism. The position sensing chip is a Hall effect chip or a magnetoresistive sensor chip; in this embodiment, a Hall effect chip is used. It is soldered to the pads of the sensing substrate using surface mount technology, with the sensing surface facing the magnet 10. The gap between the two is 0.5-5mm, and in this embodiment, it is 1-4mm to ensure sensing sensitivity and signal stability.

[0051] The circuit wiring of the sensing substrate is equipped with a grounding loop and a filter capacitor mounting structure. The grounding loop is electrically connected to the shielding layer of the transmission mechanism, which significantly improves the signal transmission stability and reduces external electromagnetic interference.

[0052] The sealing mechanism is located between the fixed mechanism and the engine mounting position, and between the fixed mechanism and the protective components of the rotating mechanism, to isolate the oil from the position sensing mechanism and prevent oil contamination. In this embodiment, the sealing mechanism includes a first seal 2 and a second seal 9, both of which are oil-resistant elastic seals. The first seal is an annular hollow sealing sleeve with an inner diameter that is interference-fitted with the outer diameter of the mounting surface of the fixed seat 1, and its outer diameter is adapted to the inner diameter of the engine mounting hole. It has anti-slip textures on its end face and an axially penetrating buffer cavity inside, which buffers engine vibration and enhances the seal. The second seal is an annular fluororubber sealing ring with a circular cross-section. Its outer diameter is interference-fitted with the inner diameter of the PCB substrate sealing groove, and its inner diameter is adapted to the outer diameter of the sealing platform of the fixed seat 1. It has a lubricating coating on its surface. This dual-sealing structure eliminates the need for potting compound, avoiding leakage problems caused by thermal expansion and contraction.

[0053] The connection transmission mechanism is electrically connected to the position sensing mechanism to stably transmit electrical signals to the engine control unit. In this embodiment, the connection transmission mechanism includes a wiring harness connector 12 and a wiring harness assembly 13. The wiring harness connector is a waterproof connector, including a connector housing, a pin core, and a sealing plug. The housing is fixed to the outlet hole of the mounting base 1 by a snap-fit. One end of the pin core is welded to the pin socket of the sensing substrate 8, and the other end is crimped to the wire of the wiring harness assembly. The sealing plug is fitted over the outside of the wire. The wiring harness assembly consists of multi-strand copper core wires, a braided copper mesh shielding layer, and a PVC insulating sheath. One end of the wire is crimped to the pin core of the wiring harness connector, and the other end is fitted with a connector that matches the engine ECU. The shielding layer wraps around the outside of the wire and is grounded, effectively suppressing electromagnetic interference and radio frequency interference.

[0054] The connection and transmission mechanism uses waterproof connectors and shielded wire harness assemblies. The shielding layer is grounded, which effectively suppresses electromagnetic interference and radio frequency interference, ensuring stable signal transmission.

[0055] The fastening assembly is used to detachably fix the protective part of the rotating mechanism to the fixed seat. Specifically, it is a screw or bolt. In this embodiment, it is a cross-head countersunk screw with anti-loosening thread on the shank and elastic washer mounting groove on the head to prevent the connection from loosening due to vibration under working conditions.

[0056] The protective components include a rotor end cover 4 and a rotor pressure plate 3. The rotor end cover has a cup-shaped cover structure with an outward flange at the open end. The outward flange has an installation hole corresponding to the through hole of the rotor pressure plate. The inner side has an annular sealing groove for assembling the second sealing element 9. The side wall has an opening groove for avoiding the transmission rod 7. The rotor pressure plate has a disc-shaped structure with an avoidance hole in the center that matches the rotor 6 shaft. Three through holes that match the fasteners 5 are evenly distributed on the edge. An annular limiting boss is provided on one side.

[0057] The assembly process in this embodiment is as follows:

[0058] The position sensing chip 11 is soldered onto the preset pads of the sensing substrate 8, and the circuit connection between the sensing substrate 8 and the wire harness connector 12 is completed to ensure that the grounding loop is connected to the shielding terminal of the wire harness connector 12.

[0059] The second sealing member 9 is embedded in the sealing groove of the fixing base 1, and the sensing substrate 8 is fixed to the inside of the fixing base 1 by screws, ensuring that the sensing surface of the position sensing chip 11 faces outward.

[0060] Embed the magnet 10 into the groove of the rotor 6 and fix it with adhesive. Install the grounding spring on the side of the rotor 6 and ensure reliable contact.

[0061] One end of the transmission rod 7 is threaded to the rotor 6 and locked with a lock nut, while the other end is reserved for connection with the float.

[0062] The rotor 6 is assembled onto the rotating shaft structure of the fixed base 1, and the rotor end cover 4 and rotor pressure plate 3 are installed in sequence. The three are fastened to the fixed base 1 by fasteners 5 to ensure that the rotor 6 rotates flexibly without jamming.

[0063] The first sealing element 2 is fitted onto the mounting surface of the fixed base 1, and the wire harness assembly 13 is connected to the wire harness connector 12 to ensure reliable grounding of the shielding layer and complete the assembly of the entire measurement assembly.

[0064] The usage process and working principle of this embodiment are as follows:

[0065] 1. Installation: Fix the assembled oil level measuring assembly to the preset position on the engine oil pan through the mounting hole of the mounting base 1, so that the float connected to the transmission rod 7 floats on the oil surface, and the other end of the wiring harness assembly 13 is connected to the engine control unit.

[0066] 2. Measurement Principle: When the oil level changes, the float rises and falls with the oil level, driving the rotor 6 to rotate around the shaft structure of the fixed base 1 via the transmission rod 7. The magnet 10 rotates synchronously with the rotor 6, changing its relative angle with the position sensing chip 11. After sensing the change in magnetic field lines, the position sensing chip 11 converts it into an electrical signal. After being processed by the filtering structure of the sensing substrate 8, it is stably transmitted to the control unit through the shielded transmission link of the wiring harness connector 12 and the wiring harness assembly 13. The control unit calculates the real-time oil level data through a preset algorithm and feeds it back to the display terminal.

[0067] 3. Operating Condition Guarantee: During operation, the static electricity conductive component conducts and releases the static electricity generated by the operating conditions through the fixed base 1; the anti-loosening fastening component ensures the stability of the structural connection; the ball joint adapts to the angle changes caused by oil level tilt; the double sealing structure isolates oil intrusion; the shielded transmission link suppresses electromagnetic interference, comprehensively ensuring measurement accuracy and service life.

[0068] This embodiment includes, but is not limited to, applications for measuring engine oil levels in motor vehicles such as general-purpose gasoline engines, motorcycles, or automobiles.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly, characterized in that, include: Fixed mechanism; A rotating mechanism is rotatably connected to the fixed mechanism; A magnetic force generator is mounted on the rotating mechanism; A position sensing mechanism is fixedly mounted on the fixed mechanism; A sealing mechanism is provided at the mounting position of the fixing mechanism and the engine, and at the mating position of the fixing mechanism and the position sensing mechanism; The transmission mechanism is electrically connected to the position sensing mechanism.

2. The non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly according to claim 1, characterized in that, The fixing mechanism includes a fixing seat, which has a rotating shaft structure for assembling the rotating mechanism and a mounting structure for positioning and fixing with the engine. The mounting structure includes at least two mounting holes distributed along the outer periphery of the fixing seat, and the fixing seat has a sealing groove in the area corresponding to the engine mounting surface.

3. The non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly according to claim 1, characterized in that, The rotating mechanism includes a rotor and a transmission rod. The rotor is rotatably coupled to the shaft structure of the fixed mechanism. One end of the transmission rod is fixedly connected to the rotor, and the other end is provided with a detachable connection structure for connecting the float. The rotor is provided with a mounting groove for fixing the magnetic force generating component.

4. The non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly according to claim 1, characterized in that, The magnetic force generating element is a permanent magnet, and the position sensing mechanism includes a sensing substrate and a position sensing chip. The position sensing chip is fixed on the sensing substrate and is disposed opposite to the sensing surface of the permanent magnet.

5. The non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly according to claim 1, characterized in that, The sealing mechanism includes a first sealing element and a second sealing element. The first sealing element is disposed between the mounting surface of the fixing mechanism and the engine, and the second sealing element is disposed between the fixing mechanism and the protective component of the rotating mechanism. Both the first sealing element and the second sealing element are oil-resistant elastic sealing elements.

6. The non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly according to claim 3, characterized in that, The rotating mechanism also includes a static-dissipating component for releasing static electricity generated during operation.

7. The non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly according to claim 2, characterized in that, It also includes a fastening assembly, which is a screw or bolt, used to detachably fix the protective component of the rotating mechanism to the fixed seat. The fastening assembly is provided with an anti-loosening structure, which includes an anti-loosening thread and an elastic washer.

8. The non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly according to claim 4, characterized in that, The sensing substrate is a substrate with circuit wiring. The circuit wiring has a grounding loop and a filter capacitor mounting structure. The grounding loop is electrically connected to the shielding layer of the connection and transmission mechanism to improve the signal anti-interference capability.

9. The non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly according to claim 3, characterized in that, The transmission rod is connected to the rotor by a thread and is axially fixed by a locking nut. The end of the transmission rod used to connect to the float is provided with a ball joint or a snap-fit ​​structure.

10. The non-contact magnetic induction wide-condition integrated protective engine oil level measurement assembly according to claim 1, characterized in that, The connection and transmission mechanism includes a wire harness connector and a wire harness assembly. The wire harness connector is a waterproof connector. The wire harness assembly includes multiple conductive core wires, a shielding layer, and an insulating sheath. The shielding layer is wrapped around the outside of the conductive core wires and grounded.

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