A multi-parameter compensation high-precision oil level sensor

Abstract

The invention discloses a multi-parameter compensation high-precision oil quantity sensor, which belongs to the technical field of capacitive oil quantity sensors. The sensor comprises a mounting seat, a circuit board, an internal environment temperature sensor, and an external environment temperature sensor. A heating oil quantity detection part and a cooling oil quantity detection part are arranged at the bottom of the mounting seat. The heating oil quantity detection part comprises a heating double-layer casing capacitor body with an inverted cone structure, and the cooling oil quantity detection part comprises a cooling double-layer casing capacitor body with a forward cone structure. The oil inlet end of the heating double-layer casing capacitor body and the oil inlet end of the cooling double-layer casing capacitor body are both connected to a temperature compensation device, and the temperature compensation device is used for adjusting the oil temperature and conveying the oil to the oil inlet end of the heating double-layer casing capacitor body or the oil inlet end of the cooling double-layer casing capacitor body. The invention can perform temperature compensation on oil quantity measurement in a heating environment and a cooling environment, thereby ensuring the accuracy of the oil level detected in the heating environment and the cooling environment.

Description

Technical Field

[0001] The invention belongs to the technical field of capacitive oil level sensors and relates to a multi-parameter compensation high-precision oil level sensor. Background Art

[0002] The capacitive fuel level sensor is one of the commonly used sensors for detecting the fuel level. Its principle is to coaxially set the inner tube and the outer tube inside the fuel tank. When the fuel medium is immersed between the inner and outer tubes, a capacitor can be formed. When the fuel level changes, the capacitance value of the capacitor changes. The change in the capacitance value can be calculated by the change in the capacitance value. In the actual measurement environment, the fuel inside the fuel tank is affected by the external ambient temperature and will heat up or cool down. The volume of the fuel will expand during the heating process, and the volume of the fuel will shrink during the cooling process. Since the existing capacitive fuel level sensor has straight inner and outer tubes, once the fuel between the inner and outer tubes expands or shrinks, and the gap between the inner and outer tubes is usually small, this will cause the height change of the fuel between the inner and outer tubes to fluctuate greatly, reducing the accuracy of the final detected fuel level.

[0003] Therefore, in view of the above-mentioned defects of the existing capacitive oil level sensor, the present invention discloses a multi-parameter compensation high-precision oil level sensor. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-parameter compensated high-precision oil level sensor, which can perform temperature compensation on oil level measurement in a heating environment and a cooling environment, thereby ensuring the accuracy of the oil level detected in a heating environment and a cooling environment.

[0005] The present invention is achieved through the following technical solutions:

[0006] A multi-parameter compensation high-precision oil quantity sensor, comprising a mounting seat, a circuit board is arranged inside the mounting seat, an internal environment temperature sensor extending to the inside of the fuel tank is arranged at the bottom of the mounting seat, an external environment temperature sensor located at the tail of the fuel tank is arranged at the top of the mounting seat, and a temperature increase oil quantity detection part and a temperature decrease oil quantity detection part connected to the circuit board are respectively arranged at the bottom of the mounting seat, the temperature increase oil quantity detection part comprises a temperature increase double-layer casing capacitor body, the temperature increase double-layer casing capacitor body is an inverted cone structure with a large top and a small bottom, and the taper of the temperature increase double-layer casing capacitor body is consistent with the temperature of the fuel in the temperature increase double-layer casing capacitor body. The cooling oil quantity detection unit comprises a cooling double-layer casing capacitor body, the cooling double-layer casing capacitor body is a positive cone structure with a small top and a large bottom, and the taper of the cooling double-layer casing capacitor body is proportional to the unit temperature contraction volume of the fuel in the unit height of the cooling double-layer casing capacitor body; the oil inlet end of the heating double-layer casing capacitor body and the oil inlet end of the cooling double-layer casing capacitor body are both connected to the temperature compensation device, and the temperature compensation device is used to adjust the oil temperature and transport the oil to the oil inlet end of the heating double-layer casing capacitor body or the oil inlet end of the cooling double-layer casing capacitor body.

[0007] The internal temperature of the fuel tank is detected by the internal ambient temperature sensor, and the external temperature of the external environment of the fuel tank is detected by the external ambient temperature sensor. In actual situations, there is a difference between the internal temperature and the external temperature. When the external temperature is higher than the internal temperature, the fuel inside the fuel tank will heat up and expand. When the external temperature is lower than the internal temperature, the fuel inside the fuel tank will cool down and shrink. Whether the fuel expands or shrinks, it will affect the oil level in the fuel tank.

[0008] When the external temperature is higher than the internal temperature, the fuel will heat up. At this time, in order to reduce the impact of the temperature increase on the oil level, the temperature of the fuel needs to be adjusted through the temperature compensation device, so that the temperature difference between the fuel temperature entering the heating double-layer casing capacitor body and the external environment is less than the calibration threshold, reducing the adverse effect of the fuel volume expansion caused by excessive temperature changes during the fuel heating process on the oil level measurement. At the same time, through the inverted cone structure of the heating double-layer casing capacitor body with a large top and a small bottom, when the fuel heats up and expands in the heating double-layer casing capacitor body, the expanded volume of the fuel can be compensated by the inverted cone structure, making the level detection during the fuel heating process more accurate.

[0009] Similarly, when the external temperature is lower than the internal temperature, the fuel will cool down. At this time, in order to reduce the impact of cooling on the oil level, the temperature of the fuel needs to be adjusted through a temperature compensation device so that the temperature difference between the fuel entering the cooling and heating double-layer casing capacitor body and the external environment is less than the calibration threshold, reducing the adverse effect of excessive temperature change during the fuel cooling process on the oil level measurement caused by the fuel volume shrinkage. At the same time, through the positive cone structure of the cooling double-layer casing capacitor body with a small top and a large bottom, when the fuel cools and shrinks in the cooling double-layer casing capacitor body, the shrinkage volume of the fuel can be compensated by the positive cone structure, making the level detection during the fuel cooling process more accurate.

[0010] In order to better realize the present invention, further, the temperature-raising double-layer casing capacitor body includes a temperature-raising outer tube and a temperature-raising inner tube, the outside of the temperature-raising inner tube is coaxially arranged with a temperature-raising outer tube, and a temperature-raising compensation cavity is arranged between the temperature-raising outer tube and the temperature-raising inner tube, and the oil inlet end of the temperature-raising compensation cavity is connected to the temperature compensation device.

[0011] In order to better realize the present invention, further, the cooling double-layer sleeve capacitor body includes a cooling outer tube and a cooling inner tube, the outer side of the cooling inner tube is coaxially arranged with a cooling outer tube, and a cooling compensation cavity is arranged between the cooling outer tube and the cooling inner tube, and the oil inlet end of the cooling compensation cavity is connected to the temperature compensation device.

[0012] In order to better realize the present invention, further, the temperature compensation device includes a temperature rise compensation part and a temperature drop compensation part, the temperature rise compensation part is connected to the oil inlet end of the temperature rise compensation chamber, and the temperature rise compensation part includes at least one cooling device; the temperature drop compensation part is connected to the oil inlet end of the temperature drop compensation chamber, and the temperature drop compensation part includes at least one heating device.

[0013] In order to better realize the present invention, further, the temperature rise compensation part includes a first box body, a plate cooler, and a first temperature sensor. The bottom of the first box body is provided with an inlet, the top of the first box body is provided with an outlet connected to the oil inlet end of the temperature rise compensation chamber, and the first box body is provided with a plate cooler and a first temperature sensor.

[0014] In order to better realize the present invention, further, the cooling compensation part includes a second box, a sheet heater, and a second temperature sensor. The bottom of the second box is provided with an inlet, and the top of the second box is provided with an outlet connected to the oil inlet end of the cooling compensation chamber. The second box is provided with a sheet heater and a second temperature sensor.

[0015] In order to better implement the present invention, further, a slow flow fence is provided at the outlet of the first box and the outlet of the second box.

[0016] In order to better implement the present invention, further, a quick-connect connector is provided on one side of the mounting seat, and the quick-connect connector is connected to the circuit board.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] Compared with the prior art, the present invention preliminarily cools the fuel through a temperature compensation device in response to the expansion of the fuel due to heating, and then further compensates for the expansion of the fuel through a heating oil quantity detection part with an inverted cone structure, thereby reducing the adverse effect of the heating and expansion of the fuel on the oil level, while not completely ignoring the effect of the heating process on the oil quantity; in response to the contraction of the fuel due to cooling, the present invention preliminarily heats the fuel through a temperature compensation device, and then further compensates for the contraction of the fuel through a cooling oil quantity detection part with a positive cone structure, thereby reducing the adverse effect of the heating and contraction of the fuel on the oil level, while not completely ignoring the effect of the cooling process on the oil quantity, ultimately ensuring the accuracy of the oil level measured in the heating environment and the cooling environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a multi-parameter compensation high-precision oil level sensor;

[0020] Figure 2 It is a schematic diagram of the structure of the heating double-layer casing capacitor;

[0021] Figure 3 It is a schematic diagram of the structure of a cooling double-layer casing capacitor;

[0022] Figure 4 It is a structural schematic diagram of the temperature rise compensation part;

[0023] Figure 5 It is a structural schematic diagram of the temperature reduction compensation part;

[0024] Figure 6 It is a schematic diagram of the relationship between the expansion volume of fuel at unit temperature and the taper of the inverted cone structure;

[0025] Figure 7 This is a schematic diagram of the relationship between the contraction volume of fuel at unit temperature and the taper of the positive cone structure.

[0026] Among them: 1-mounting seat; 2-heating oil quantity detection part; 3-cooling oil quantity detection part; 4-temperature compensation device; 21-heating double-layer casing capacitor; 31-cooling double-layer casing capacitor; 211-heating outer tube; 212-heating inner tube; 213-temperature rising compensation cavity; 311-cooling outer tube; 312-cooling inner tube; 313-cooling compensation cavity; 41-temperature rising compensation part; 42-cooling compensation part; 411-plate cooler; 412-first temperature sensor; 421-plate heater; 422-second temperature sensor. DETAILED DESCRIPTION

[0027] The following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the present invention explicitly states otherwise, singular forms are also intended to include plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0030] Terminology explanation section: The terms "install", "connect", "connect", "fixed" and the like in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0031] Embodiment 1:

[0032] A multi-parameter compensation high-precision oil level sensor of this embodiment, such as Figure 1As shown, it includes a mounting base 1, a circuit board is arranged inside the mounting base 1, an internal environment temperature sensor extending to the inside of the fuel tank is arranged at the bottom of the mounting base 1, an external environment temperature sensor located at the tail of the fuel tank is arranged on the top of the mounting base 1, and a heating oil quantity detection part 2 and a cooling oil quantity detection part 3 connected to the circuit board are respectively arranged at the bottom of the mounting base 1, and the heating oil quantity detection part 2 includes a heating double-layer casing capacitor body 21, and the heating double-layer casing capacitor body 21 is an inverted cone structure with a large top and a small bottom, and the taper of the heating double-layer casing capacitor body 21 is consistent with the unit height of the fuel in the heating double-layer casing capacitor body 21. The cooling oil quantity detection part 3 includes a cooling double-layer casing capacitor 31, which is a positive cone structure with a small top and a large bottom, and the taper of the cooling double-layer casing capacitor 31 is proportional to the unit temperature contraction volume of the fuel in the unit height of the cooling double-layer casing capacitor 31; the oil inlet end of the heating double-layer casing capacitor 21 and the oil inlet end of the cooling double-layer casing capacitor 31 are both connected to the temperature compensation device 4, and the temperature compensation device 4 is used to adjust the oil temperature and transport the oil to the oil inlet end of the heating double-layer casing capacitor 21 or the oil inlet end of the cooling double-layer casing capacitor 31.

[0033] Taking the heating process as an example, Figure 6 As shown in the figure, in a unit height h, the expansion volume of the fuel at a unit temperature is dV1. When dV1 increases and h remains unchanged, the taper of the inverted cone structure increases. Taking the cooling process as an example, Figure 7 As shown, in unit height h, the contraction volume of fuel at unit temperature is dV2. When dV2 increases and h remains unchanged, the taper of the positive cone structure increases.

[0034] The external environment temperature sensor detects the external temperature, and the internal environment temperature sensor detects the internal temperature. The external environment temperature sensor and the internal environment temperature sensor send the detected temperature data to the external controller. When the external temperature is higher than the internal temperature, the fuel is in the process of heating up. At this time, the external controller controls the temperature compensation device 4 to cool down the fuel, thereby slowing down the heating rate of the fuel, and avoiding the excessive error in the oil level measurement result caused by the fuel heating rate being too fast, but at the same time, the impact of the heating on the oil level needs to be considered. Therefore, the fuel is cooled by the temperature compensation device 4, and the fuel heating rate is slowed down, and the temperature of the fuel is adjusted to a temperature difference between the fuel and the external temperature that is less than the calibration value.

[0035] For example, if the external temperature is 35°C and the internal temperature is 32°C, the temperature of the fuel is adjusted to 33.5°C-34°C by the temperature compensation device 4, so that the temperature difference between the fuel temperature after adjustment and the external temperature is less than or equal to 1.5°C. Then the fuel is sent to the heating double-layer casing capacitor 21, which has an inverted cone structure with a large top and a small bottom. The fuel enters between the double-layer casings, which form a capacitor. The liquid level height can be calculated by detecting the capacitance change of the capacitor. At the same time, the inverted cone structure is used to further compensate for the expansion of the fuel, thereby reducing the adverse effect of the expansion of the fuel on the oil level, while not completely ignoring the effect of heating on the oil level.

[0036] Similarly, for example, if the external temperature is 32°C and the internal temperature is 35°C, the temperature of the fuel is adjusted to 33°C-33.5°C by the temperature compensation device 4, so that the temperature difference between the fuel temperature after adjustment and the external temperature is less than or equal to 1.5°C. Then the fuel is sent to the cooling double-layer casing capacitor 31, which has a positive cone structure with a small top and a large bottom. The fuel enters between the double-layer casings, and the double-layer casings constitute a capacitor. The liquid level height can be calculated by detecting the capacitance change of the capacitor. At the same time, the positive cone structure is used to further compensate for the contraction of the fuel, thereby reducing the adverse effect of the fuel contraction on the oil level, while not completely ignoring the effect of cooling on the oil level.

[0037] Furthermore, a quick-connect connector is provided on one side of the mounting base 1, and the quick-connect connector is connected to the circuit board. The other end of the quick-connect connector is connected to an external computer through a quick-connect cable, and data exchange with the external computer is achieved through the quick-connect cable.

[0038] Embodiment 2:

[0039] A multi-parameter compensation high-precision oil level sensor is improved on the basis of embodiment 1, such as Figure 2 As shown, the temperature-raising double-layer casing capacitor body 21 includes a temperature-raising outer tube 211 and a temperature-raising inner tube 212. The temperature-raising outer tube 211 is coaxially arranged outside the temperature-raising inner tube 212, and a temperature-raising compensation cavity 213 is arranged between the temperature-raising outer tube 211 and the temperature-raising inner tube 212. The oil inlet end of the temperature-raising compensation cavity 213 is connected to the temperature compensation device 4.

[0040] The heating outer tube 211 and the heating inner tube 212 are both inverted cone structures with a large top and a small bottom, and the tapers of the heating outer tube 211 and the heating inner tube 212 are the same, ensuring that the tube wall of the heating outer tube 211 is parallel to the tube wall of the heating inner tube 212. A plurality of oil inlets are arranged circumferentially between the bottom of the heating outer tube 211 and the heating inner tube 212, and the oil inlets are connected to the temperature compensation device 4. When the external temperature is higher than the internal temperature, the fuel enters between the heating outer tube 211 and the heating inner tube 212 through the temperature compensation device 4, and the fuel is cooled in advance by the temperature compensation device 4 to slow down the heating rate of the fuel and control the temperature difference between the fuel and the external temperature. Then the fuel enters the area between the heating outer tube 211 and the heating inner tube 212, and the capacitance value between the heating outer tube 211 and the heating inner tube 212 is detected by the circuit board, and the capacitance value is transmitted to the external computer, and then the oil level inside the fuel tank under the heating environment is calculated.

[0041] The other parts of this embodiment are the same as those of Embodiment 1, and thus will not be described in detail.

[0042] Embodiment 3:

[0043] A multi-parameter compensation high-precision oil level sensor, improved on the basis of embodiment 1 or 2, such as Figure 3 As shown, the cooling double-layer sleeve capacitor body 31 includes a cooling outer tube 311 and a cooling inner tube 312, the cooling outer tube 311 is coaxially arranged outside the cooling inner tube 312, and a cooling compensation chamber 313 is arranged between the cooling outer tube 311 and the cooling inner tube 312, and the oil inlet end of the cooling compensation chamber 313 is connected to the temperature compensation device 4.

[0044] The cooling outer tube 311 and the cooling inner tube 312 are both in a positive conical structure with a small top and a large bottom, and the cooling outer tube 311 and the cooling inner tube 312 have the same taper, ensuring that the tube wall of the cooling outer tube 311 is parallel to the tube wall of the cooling inner tube 312. A plurality of oil inlets are arranged along the circumferential direction between the bottom of the cooling outer tube 311 and the cooling inner tube 312, and the oil inlets are connected to the temperature compensation device 4. When the external temperature is lower than the internal temperature, the fuel enters between the cooling outer tube 311 and the cooling inner tube 312 through the temperature compensation device 4, and the fuel is preheated by the temperature compensation device 4 to slow down the cooling rate of the fuel and control the temperature difference between the fuel and the external temperature. Then the fuel enters the area between the cooling outer tube 311 and the cooling inner tube 312, and the capacitance value between the cooling outer tube 311 and the cooling inner tube 312 is detected by the circuit board, and the capacitance value is transmitted to the external computer, and then the oil level inside the fuel tank under the cooling environment is calculated.

[0045] The other parts of this embodiment are the same as those of Embodiment 1 or 2, and thus will not be described in detail.

[0046] Embodiment 4:

[0047] A multi-parameter compensation high-precision oil level sensor, improved on the basis of any one of embodiments 1-3, such as Figure 2 and Figure 3 As shown, the temperature compensation device 4 includes a temperature rise compensation part 41 and a temperature drop compensation part 42, the temperature rise compensation part 41 is connected to the oil inlet end of the temperature rise compensation chamber 213, and the temperature rise compensation part 41 includes at least one cooling device; the temperature drop compensation part 42 is connected to the oil inlet end of the temperature drop compensation chamber 313, and the temperature drop compensation part 42 includes at least one heating device.

[0048] The temperature rise compensation part 41 compensates for the temperature rise environment of the fuel. When the external computer receives that the external temperature is higher than the internal temperature, the temperature rise compensation part 41 is controlled to start to cool the fuel. The temperature drop compensation part 42 compensates for the temperature drop environment of the fuel. When the external computer receives that the external temperature is lower than the internal temperature, the temperature drop compensation part 42 is controlled to start to heat the fuel.

[0049] The other parts of this embodiment are the same as any one of Embodiments 1-3, so they are not described again.

[0050] Embodiment 5:

[0051] A multi-parameter compensation high-precision oil level sensor, improved on the basis of any one of embodiments 1-4, such as Figure 4 As shown, the temperature rise compensation part 41 includes a first box body, a plate cooler 411, and a first temperature sensor 412. The bottom of the first box body is provided with an inlet, the top of the first box body is provided with an outlet connected to the oil inlet end of the temperature rise compensation chamber 213, and the plate cooler 411 and the first temperature sensor 412 are provided inside the first box body.

[0052] The temperature of the fuel inside the first box is detected in real time by the first temperature sensor 412, and the fuel inside the first box is cooled by the plate cooler 411. When the first temperature sensor 412 detects that the temperature of the fuel inside the first box is reduced to a preset temperature, the circuit board sends the detected capacitance value between the heating outer tube 211 and the heating inner tube 212 to the external computer, and then calculates the oil level inside the tank at this time.

[0053] Furthermore, a slow flow fence is provided at the outlet of the first box.

[0054] The other parts of this embodiment are the same as any one of Embodiments 1-4, so they are not described again.

[0055] Embodiment 6:

[0056] A multi-parameter compensation high-precision oil level sensor, improved on the basis of any one of embodiments 1-5, such as Figure 5As shown, the cooling compensation part 42 includes a second box, a sheet heater 421, and a second temperature sensor 422. The bottom of the second box is provided with an inlet, the top of the second box is provided with an outlet connected to the oil inlet end of the cooling compensation chamber 313, and the inside of the second box is provided with a sheet heater 421 and a second temperature sensor 422.

[0057] The temperature of the fuel inside the second tank is detected in real time by the second temperature sensor 422, and the fuel inside the second tank is heated by the sheet heater 421. When the second temperature sensor 422 detects that the temperature of the fuel inside the second tank rises to a preset temperature, the circuit board sends the detected capacitance value between the cooling outer tube 311 and the cooling inner tube 312 to an external computer, and then calculates the oil level inside the tank.

[0058] Furthermore, a slow flow fence is provided at the outlet of the second box.

[0059] The other parts of this embodiment are the same as any one of Embodiments 1-5, so they are not described again.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A multi-parameter compensation high-precision oil level sensor, comprising a mounting seat (1), a circuit board being arranged inside the mounting seat (1), an internal environment temperature sensor extending to the inside of the oil tank being arranged at the bottom of the mounting seat (1), and an external environment temperature sensor located at the rear of the oil tank being arranged at the top of the mounting seat (1), characterized in that: The bottom of the mounting seat (1) is provided with a heating oil quantity detection part (2) and a cooling oil quantity detection part (3) connected to the circuit board, respectively; the heating oil quantity detection part (2) comprises a heating double-layer casing capacitor body (21); the heating double-layer casing capacitor body (21) is in an inverted cone structure with a larger top and a smaller bottom, and the taper of the heating double-layer casing capacitor body (21) is proportional to the unit temperature expansion volume of the fuel per unit height of the heating double-layer casing capacitor body (21); the cooling oil quantity detection part (3) comprises a cooling double-layer casing capacitor body (31); the cooling double-layer casing capacitor body ( The cooling double-layer casing capacitor (31) has a positive conical structure with a small top and a large bottom, and the taper of the cooling double-layer casing capacitor (31) is proportional to the unit temperature contraction volume of the fuel in the unit height of the cooling double-layer casing capacitor (31); the oil inlet end of the heating double-layer casing capacitor (21) and the oil inlet end of the cooling double-layer casing capacitor (31) are both connected to the temperature compensation device (4), and the temperature compensation device (4) is used to adjust the oil temperature and transport the oil to the oil inlet end of the heating double-layer casing capacitor (21) or the oil inlet end of the cooling double-layer casing capacitor (31); the heating double-layer casing capacitor (21) 1) comprising a temperature-raising outer tube (211) and a temperature-raising inner tube (212), wherein the temperature-raising outer tube (211) is coaxially arranged outside the temperature-raising inner tube (212), and a temperature-raising compensation chamber (213) is arranged between the temperature-raising outer tube (211) and the temperature-raising inner tube (212), and the oil inlet end of the temperature-raising compensation chamber (213) is connected to a temperature compensation device (4); the temperature-reducing double-layer casing capacitor (31) comprising a temperature-reducing outer tube (311) and a temperature-reducing inner tube (312), wherein the temperature-reducing outer tube (311) is coaxially arranged outside the temperature-reducing inner tube (312), and the temperature-reducing outer tube (311) is arranged between the temperature-reducing outer tube (211) and the temperature-reducing inner tube (212). ) and the cooling inner tube (312), a cooling compensation chamber (313) is provided, the oil inlet end of the cooling compensation chamber (313) is connected to the temperature compensation device (4); the temperature compensation device (4) comprises a temperature rise compensation part (41) and a temperature fall compensation part (42), the temperature rise compensation part (41) is connected to the oil inlet end of the temperature rise compensation chamber (213), and the temperature rise compensation part (41) comprises at least one cooling device; the cooling compensation part (42) is connected to the oil inlet end of the cooling compensation chamber (313), and the cooling compensation part (42) comprises at least one heating device.

2. A multi-parameter compensation high-precision oil level sensor according to claim 1, characterized in that: The temperature rise compensation part (41) comprises a first box, a plate cooler (411), and a first temperature sensor (412); an inlet is arranged at the bottom of the first box, an outlet connected to the oil inlet end of the temperature rise compensation chamber (213) is arranged at the top of the first box, and the plate cooler (411) and the first temperature sensor (412) are arranged inside the first box.

3. A multi-parameter compensation high-precision oil level sensor according to claim 2, characterized in that: The temperature reduction compensation part (42) comprises a second box, a sheet-type heater (421), and a second temperature sensor (422); the bottom of the second box is provided with an inlet, the top of the second box is provided with an outlet connected to the oil inlet end of the temperature reduction compensation chamber (313); and the sheet-type heater (421) and the second temperature sensor (422) are provided inside the second box.

4. A multi-parameter compensation high-precision oil level sensor according to claim 3, characterized in that: A slow flow fence is arranged at the outlet of the first box and the outlet of the second box.

5. The multi-parameter compensation high-precision oil level sensor according to claim 1, characterized in that: A quick-connect connector is provided on one side of the mounting seat (1), and the quick-connect connector is connected to the circuit board.

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