An oil amount sensing circuit and an oil amount sensor
By designing a pressure detection and signal processing module in the oil quantity sensing circuit, the measurement results of the oil quantity sensor are calibrated in real time, solving the measurement error problem of the oil quantity sensor under extreme pressure conditions and realizing high-precision and reliable oil quantity detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN NANHANG ELECTRONICS IND
- Filing Date
- 2025-08-15
- Publication Date
- 2026-07-21
AI Technical Summary
Existing fuel level sensors are prone to measurement errors, output drift, or response delays under extreme pressure conditions, resulting in inaccurate fuel level detection results.
An oil quantity sensing circuit was designed, including an oil quantity detection module, a pressure detection module, and a signal processing module. The pressure detection module detects the ambient pressure in real time, and the signal processing module performs oil quantity calibration calculation based on the pressure signal and the initial oil quantity to obtain the target oil quantity, thereby reducing measurement errors caused by pressure.
Maintaining high-precision oil quantity measurement under different pressure environments improves the accuracy and reliability of oil quantity measurement.
Smart Images
Figure CN224535176U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of sensor technology, and in particular to an oil quantity sensing circuit and an oil quantity sensor. Background Technology
[0002] A fuel level sensor is a device used to monitor the amount of fuel in a fuel tank. For example, it can be used to measure the amount of fuel in the fuel tank of a vehicle (such as an airplane). However, the performance of current fuel level sensors is easily affected by external pressure environments. Specifically, in practical applications, fuel level sensors may face different pressure environments (such as high altitude, deep sea, or high-speed movement). Under extreme pressure conditions, current fuel level sensors are prone to problems such as measurement errors, output drift, or response delays, resulting in inaccurate fuel level detection results.
[0003] Therefore, improving the accuracy and reliability of oil quantity measurement has become an urgent technical problem to be solved. Utility Model Content
[0004] The main objective of this application is to provide an oil quantity sensing circuit and an oil quantity sensor, which aims to improve the accuracy and reliability of oil quantity measurement.
[0005] To achieve the above objectives, a first aspect of this application provides a fuel level sensing circuit, the fuel level sensing circuit comprising:
[0006] Oil level detection module, pressure detection module, and signal processing module;
[0007] The signal processing module is electrically connected to the oil quantity detection module and the pressure detection module;
[0008] The pressure detection module is used to detect the environmental pressure of the target fuel tank and obtain a pressure signal; the fuel quantity detection module is used to detect the fuel quantity of the target fuel tank and obtain an initial fuel quantity; the signal processing module is used to perform fuel quantity calibration calculation based on the pressure signal and the initial fuel quantity to obtain the target fuel quantity.
[0009] In some embodiments, the pressure detection module includes a pressure sensor, a compensation unit, and a voltage amplification unit;
[0010] The pressure sensor is electrically connected to the compensation unit, the compensation unit is electrically connected to the voltage amplification unit, and the voltage amplification unit is electrically connected to the signal processing module;
[0011] The pressure sensor is used to detect the ambient pressure of the target oil tank; the compensation unit is used to perform zero-point temperature drift compensation based on the ambient pressure to obtain a compensation voltage; the voltage amplification unit is used to amplify the compensation voltage to obtain the pressure signal.
[0012] In some embodiments, the pressure sensor includes a first strain gauge, a second strain gauge, a third strain gauge, and a fourth strain gauge; the compensation unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor.
[0013] One end of the first strain gauge is electrically connected to one end of the second strain gauge, one end of the first resistor, one end of the second resistor, and one end of the fifth resistor; the other end of the first strain gauge is electrically connected to one end of the third strain gauge, the other end of the second resistor, and the voltage amplification unit.
[0014] The other end of the second strain gauge is electrically connected to one end of the fourth strain gauge, the other end of the first resistor, and the voltage amplification unit; the other end of the third strain gauge is electrically connected to one end of the fourth resistor; the other end of the fourth strain gauge is electrically connected to one end of the third resistor; the other end of the third resistor, the other end of the fourth resistor, and the other end of the fifth resistor are grounded.
[0015] In some embodiments, the voltage amplification unit includes an operational amplifier;
[0016] The input terminal of the operational amplifier is electrically connected to the compensation unit, and the output terminal of the operational amplifier is electrically connected to the signal processing module.
[0017] In some embodiments, the pressure sensor includes a diffused silicon pressure sensor.
[0018] In some embodiments, the fuel level sensing circuit further includes a communication interface module;
[0019] The signal processing module is electrically connected to the communication interface module, which is used for communication connection to the oil quantity testing system.
[0020] The signal processing module is also used to detect abnormal signals based on the pressure signal and the target oil quantity to generate oil quantity measurement fault information; the communication interface module is used to send the oil quantity measurement fault information to the oil quantity testing system.
[0021] In some embodiments, the fuel level sensing circuit further includes a power supply filtering module;
[0022] The power filtering module is electrically connected to the communication interface module and the signal processing module;
[0023] The communication interface module is also used to acquire the input voltage, and the power supply filtering module is used to filter the input voltage to supply power to the signal processing module.
[0024] In some embodiments, the fuel level sensing circuit further includes a power conversion module;
[0025] The power conversion module is electrically connected to the power filtering module and the signal processing module; the power conversion module is used to convert the input voltage to supply power to the signal processing module.
[0026] In some embodiments, the communication interface module is connected to the oil quantity testing system via a serial bus.
[0027] To achieve the above objectives, a second aspect of the present application provides a fuel level sensor, which includes the fuel level sensing circuit described in the first aspect.
[0028] The oil quantity sensing circuit and oil quantity sensor proposed in this application measure the oil quantity of the target oil tank through an oil quantity detection module to obtain the initial oil quantity, and simultaneously detect the environmental pressure of the target oil tank through a pressure detection module to obtain a pressure signal. This allows for real-time detection of the environmental pressure of the target oil tank, and the signal processing module performs oil quantity calibration calculation based on the pressure signal and the initial oil quantity to obtain the oil quantity after dynamic calibration based on environmental pressure, i.e., the target oil quantity. This enables high-precision measurement under different pressure environments (such as extreme pressure environments), reduces oil quantity measurement errors caused by pressure, and improves the accuracy and reliability of oil quantity measurement. Attached Figure Description
[0029] Figure 1 This is a block diagram of the fuel level sensing circuit provided in an embodiment of this application;
[0030] Figure 2 This is a module block diagram of a fuel level sensing circuit provided in another embodiment of this application;
[0031] Figure 3 This is a circuit diagram of the pressure detection module provided in an embodiment of this application;
[0032] Figure 4 This is a module block diagram of a fuel level sensing circuit provided in another embodiment of this application;
[0033] Figure 5 This is a module block diagram of a fuel level sensing circuit provided in another embodiment of this application;
[0034] Figure 6 This is a module block diagram of a fuel level sensing circuit provided in another embodiment of this application;
[0035] Figure 7 This is a block diagram of a fuel level sensing circuit provided in another embodiment of this application.
[0036] Reference numerals: Oil level detection module 100; Pressure detection module 200; Signal processing module 300; Communication interface module 400; Power filtering module 500; Power conversion module 600; Pressure sensor 210; Compensation unit 220; Voltage amplification unit 230;
[0037] First strain gauge SG1; Second strain gauge SG2; Third strain gauge SG3; Fourth strain gauge SG4; First resistor R1; Second resistor R2; Third resistor R3; Fourth resistor R4; Fifth resistor R5; Operational amplifier OP1. Detailed Implementation
[0038] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0039] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.
[0041] First, let's analyze some of the terms used in this application:
[0042] Artificial Intelligence (AI) is a new technical science that studies and develops theories, methods, technologies, and application systems for simulating, extending, and expanding human intelligence. A branch of computer science, AI attempts to understand the essence of intelligence and produce intelligent machines that can react in a way similar to human intelligence. Research in this field includes robotics, speech recognition, image recognition, natural language processing, and expert systems. AI can be a simulation of the information processes of human consciousness and thought. It can also be the theory, methods, technologies, and application systems that use digital computers or machines controlled by digital computers to simulate, extend, and expand human intelligence, perceive the environment, acquire knowledge, and use that knowledge to obtain optimal results. Fundamental AI technologies generally include sensors, dedicated AI chips, cloud computing, distributed storage, big data processing technology, operating / interactive systems, and mechatronics. AI software technologies mainly include computer vision, robotics, biometrics, speech processing, natural language processing, and machine learning / deep learning. This application can acquire and process relevant data based on AI technology.
[0043] Strain gauges, also known as resistance strain gauges, are elements used to measure strain, consisting of a sensitive grid and other components. The sensitive grid is the core structural component of a metal resistance strain gauge, typically made of metal wire or foil, and its function is to convert mechanical deformation into a change in resistance. The working principle of resistance strain gauges is based on the strain effect. The strain effect refers to the phenomenon that when a conductor or semiconductor material undergoes mechanical deformation under the action of an external force, its resistance value changes accordingly.
[0044] The fuel quantity sensing circuit and fuel quantity sensor provided in this application are specifically described through the following embodiments. First, the fuel quantity sensing circuit in this application embodiment is described.
[0045] Figure 1 This is an optional module block diagram of the fuel level sensing circuit provided in an embodiment of this application. Figure 1 The fuel level sensing circuit in the system may include, but is not limited to:
[0046] Oil quantity detection module 100, pressure detection module 200, and signal processing module 300;
[0047] Signal processing module 300 is electrically connected to oil quantity detection module 100 and pressure detection module 200;
[0048] The pressure detection module 200 is used to detect the environmental pressure of the target oil tank and obtain a pressure signal; the oil quantity detection module 100 is used to detect the oil quantity of the target oil tank and obtain the initial oil quantity; the signal processing module 300 is used to perform oil quantity calibration calculation based on the pressure signal and the initial oil quantity to obtain the target oil quantity.
[0049] The beneficial effects of this application embodiment include, but are not limited to: measuring the oil quantity of the target oil tank through the oil quantity detection module 100 to obtain the initial oil quantity, and simultaneously detecting the environmental pressure of the target oil tank through the pressure detection module 200 to obtain the pressure signal. This allows for real-time detection of the pressure of the environment in which the target oil tank is located. Furthermore, the signal processing module 300 performs oil quantity calibration calculation based on the pressure signal and the initial oil quantity to obtain the oil quantity after dynamic calibration based on the environmental pressure, i.e., the target oil quantity. This enables high-precision oil quantity measurement under various pressure environments such as high pressure, low pressure, and normal pressure, or other extreme pressure environments, reducing oil quantity measurement errors caused by pressure and improving the accuracy and reliability of oil quantity measurement.
[0050] In some embodiments, the fuel level detection module 100 is a module for measuring the liquid level. For example, the fuel level detection module 100 can be used to measure the height of the fuel level in the fuel tank to obtain the fuel quantity.
[0051] It should be noted that the target fuel tank is the fuel tank whose fuel level needs to be measured. In this embodiment, the fuel level of the target fuel tank is measured using a fuel level sensing circuit. Specifically, the target fuel tank can be a fuel tank, such as an aircraft fuel tank. The target fuel tank can also be the fuel tank of other means of transportation (such as trains, cars, etc.), and this embodiment does not limit this.
[0052] In some embodiments, the oil level detection module 100 employs a capacitive liquid level measurement principle. For example, the oil level detection module 100 may include an oil level sensor and a capacitor charging and discharging unit. In another embodiment, the oil level detection module 100 may also include other circuit elements, and is not limited thereto.
[0053] In some embodiments, the signal processing module 300 is a module for performing fuel quantity calibration calculations. Specifically, the signal processing module 300 may be a microcontroller unit (MCU, also known as a single-chip microcomputer). In another embodiment, the signal processing module 300 may further include any one or more of the following: a central processing unit (CPU) and a programmable logic controller (PLC).
[0054] In some embodiments, the signal processing module 300 can use a lookup table method to calibrate the oil quantity based on the pressure signal and the initial oil quantity to obtain the target oil quantity. For example, the oil quantity calibration rules and / or calibration parameters corresponding to the pressure signal can be looked up from a preset pressure-oil quantity lookup table to calibrate the initial oil quantity according to the oil quantity calibration rules and / or calibration parameters. In another embodiment, oil quantity calibration can also be performed in other ways, such as through artificial intelligence (AI) models, etc., which is not limited in this application embodiment.
[0055] In some embodiments, the pressure detection module 200 can be used to store calibration parameters. For example, calibration parameters can be stored in the pressure sensor 210 of the pressure detection module 200 (see reference). Figure 2 To avoid data loss, non-volatile memory is used.
[0056] In some embodiments, when the pressure value corresponding to the pressure signal exceeds a preset pressure threshold range, the signal processing module 300 can initiate a self-calibration procedure, for example, by discarding pressure signals that exceed the pressure threshold range. Abnormal signals can also be detected and processed using other methods, and are not limited to these.
[0057] Please see Figure 2 In some embodiments, the pressure detection module 200 includes a pressure sensor 210, a compensation unit 220, and a voltage amplification unit 230;
[0058] Pressure sensor 210 is electrically connected to compensation unit 220, compensation unit 220 is electrically connected to voltage amplification unit 230, and voltage amplification unit 230 is electrically connected to signal processing module 300.
[0059] Pressure sensor 210 is used to detect the ambient pressure of the target oil tank; compensation unit 220 is used to perform zero-point temperature drift compensation based on the ambient pressure to obtain compensation voltage; voltage amplification unit 230 is used to amplify the compensation voltage to obtain a pressure signal.
[0060] The advantage of this embodiment is that the ambient pressure of the target oil tank is detected by the pressure sensor 210, and the zero-point temperature drift compensation is performed by the compensation unit 220 based on the ambient pressure to obtain a compensation voltage. This effectively suppresses the output drift of the pressure sensor 210 caused by temperature changes, improving the accuracy of pressure measurement. Then, the compensation voltage is amplified by the voltage amplification unit 230 to obtain a pressure signal for calibrating the initial oil quantity, thereby improving the accuracy and reliability of oil quantity measurement.
[0061] In some embodiments, specifically, the compensation unit 220 may include a resistance bridge, such as a Wheatstone bridge. The compensation unit 220 is used to perform zero-point compensation and zero-point temperature drift compensation to improve the accuracy of oil quantity measurement.
[0062] Please see Figure 3 In some embodiments, the pressure sensor 210 includes a first strain gauge SG1, a second strain gauge SG2, a third strain gauge SG3, and a fourth strain gauge SG4; the compensation unit 220 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5.
[0063] One end of the first strain gauge SG1 is electrically connected to one end of the second strain gauge SG2, one end of the first resistor R1, one end of the second resistor R2, and one end of the fifth resistor R5; the other end of the first strain gauge SG1 is electrically connected to one end of the third strain gauge SG3, the other end of the second resistor R2, and the voltage amplification unit 230.
[0064] The other end of the second strain gauge SG2 is electrically connected to one end of the fourth strain gauge SG4, the other end of the first resistor R1, and the voltage amplification unit 230; the other end of the third strain gauge SG3 is electrically connected to one end of the fourth resistor R4; the other end of the fourth strain gauge SG4 is electrically connected to one end of the third resistor R3; the other end of the third resistor R3, the other end of the fourth resistor R4, and the other end of the fifth resistor R5 are grounded.
[0065] The advantage of this embodiment is that the pressure sensor 210 is composed of a first strain gauge SG1, a second strain gauge SG2, a third strain gauge SG3, and a fourth strain gauge SG4, and the compensation unit 220 is composed of a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. This allows the compensation unit 220 to compensate for zero-point temperature drift of the pressure measured by the pressure sensor 210 based on the ambient pressure, thereby obtaining a compensation voltage. This effectively suppresses the output drift of the pressure sensor 210 caused by temperature changes, improves the accuracy of pressure measurement, and consequently improves the accuracy and reliability of oil quantity measurement.
[0066] In some embodiments, the first resistor R1 or the second resistor R2 can be a temperature drift compensation resistor. For example, only one of the first resistor R1 and the second resistor R2 can be used as the temperature drift compensation resistor, while the other resistor is set to an open circuit, thereby performing zero-point temperature drift compensation. The third resistor R3 can be a zero-adjustment resistor, and the fourth resistor R4 can be a resistor used for zero-point setting. The fifth resistor R5 can be a temperature compensation resistor, used for temperature sensitivity compensation. This can overcome zero-point and zero-point temperature drift, and improve measurement accuracy and sensitivity.
[0067] Please see Figure 3 In some embodiments, the voltage amplification unit 230 includes an operational amplifier OP1;
[0068] The input terminal of the operational amplifier OP1 is electrically connected to the compensation unit 220, and the output terminal of the operational amplifier OP1 is electrically connected to the signal processing module 300.
[0069] The advantage of this embodiment is that the compensation voltage output by the compensation unit 220 is amplified by the operational amplifier OP1 so that the amplified signal conforms to the standard input voltage range of the signal processing module 300, so that voltage calibration can be performed subsequently, thereby improving the reliability of oil quantity measurement.
[0070] Specifically, operational amplifier OP1 can be an instrumentation amplifier.
[0071] It should be noted that, in Figure 3 In this configuration, interface VIN is used to obtain a first voltage (e.g., 10V), and interface VCC is used to obtain a second voltage to power operational amplifier OP1. The second voltage and the first voltage can be the same or different. Interface POUT is used to connect to signal processing module 300.
[0072] In some embodiments, pressure sensor 210 includes a diffused silicon pressure sensor.
[0073] The advantage of this embodiment is that, by using a diffused silicon pressure sensor, based on its piezoresistive effect principle, the ambient pressure of the target fuel tank can be measured more accurately, thereby improving the accuracy of pressure measurement and thus improving the accuracy of fuel quantity measurement.
[0074] In some embodiments, it should be noted that the piezoresistive effect principle refers to the fact that when ambient pressure is applied to the strain gauge (SG) of a diffused silicon pressure sensor, the strain gauge (i.e., a single-crystal silicon diaphragm) undergoes slight deformation, causing a change in its resistance value and outputting a voltage signal proportional to the pressure. The high stiffness of the single-crystal silicon material of the strain gauge ensures that its resistance sensitivity is higher than that of metal strain gauges, enabling the detection of even minute pressure changes, thereby improving the accuracy of pressure measurement.
[0075] It should be noted that diffused silicon pressure sensors are also known as piezoresistive pressure sensors. Diffused silicon pressure sensors can sense liquid pressure.
[0076] Please see Figure 4 In some embodiments, the fuel level sensing circuit further includes a communication interface module 400;
[0077] The signal processing module 300 is electrically connected to the communication interface module 400, which is used for communication connection to the oil quantity testing system.
[0078] The signal processing module 300 is also used to detect abnormal signals based on the pressure signal and the target oil quantity to generate oil quantity measurement fault information; the communication interface module 400 is used to send the oil quantity measurement fault information to the oil quantity testing system.
[0079] The advantage of this embodiment is that after the signal processing module 300 detects abnormal signals based on the pressure signal and the target oil quantity and generates oil quantity measurement fault information, the oil quantity measurement fault information is sent to the oil quantity testing system through the communication interface module 400. This enables real-time reporting and remote transmission of fault information, allowing users to respond to fault information and intervene in maintenance in a timely manner, thus ensuring the reliability of oil quantity measurement.
[0080] In some embodiments, the signal processing module 300 can be used to output a fault alarm signal when abnormal pressure or oil quantity data is detected, and the communication interface module 400 is used to send the fault alarm signal to the oil quantity testing system. The communication interface module 400 can also be used to send the fault alarm signal to an external device, such as a user terminal (mobile phone, tablet computer, laptop computer, etc.), but is not limited thereto.
[0081] Please see Figure 5 In some embodiments, the fuel level sensing circuit further includes a power supply filtering module 500.
[0082] The power filtering module 500 is electrically connected to the communication interface module 400 and the signal processing module 300;
[0083] The communication interface module 400 is also used to acquire the input voltage, and the power supply filtering module 500 is used to filter the input voltage to supply power to the signal processing module 300.
[0084] The advantage of this embodiment is that the input voltage of the communication interface module 400 is filtered by the power supply filtering module 500, which can filter out noise components in the input voltage and stabilize the voltage amplitude. Then, the filtered voltage is used to power the signal processing module 300, thereby improving the safety of the fuel level sensing circuit.
[0085] In some embodiments, the input voltage acquired by the communication interface module 400 can be a 28V DC voltage. In another embodiment, the input voltage can be other voltage values, and is not limited thereto. For example, the power supply filter module 500 filters the input voltage and outputs a 5V DC voltage to power the signal processing module 300.
[0086] Please see Figure 6In some embodiments, the power filtering module 500 is electrically connected to the compensation unit 220 and the voltage amplification unit 230; the power filtering module 500 is used to filter the input voltage of the communication interface module 400 and use the filtered voltage (such as 5V DC voltage) to power the compensation unit 220 and the voltage amplification unit 230.
[0087] Please see Figure 7 In some embodiments, the fuel level sensing circuit further includes a power conversion module 600;
[0088] The power conversion module 600 is electrically connected to the power filtering module 500 and the signal processing module 300; the power conversion module 600 is used to convert the input voltage to power the signal processing module 300.
[0089] The advantage of this embodiment is that the input voltage is converted by the power conversion module 600 and then used to power the signal processing module 300. This allows the input voltage to be adjusted to meet the power supply requirements of the signal processing module 300, thereby improving the operational reliability of the oil quantity measurement.
[0090] In some embodiments, specifically, the power conversion module 600 can convert a 5V DC input voltage to a 3.3V DC voltage to power the signal processing module 300.
[0091] In some embodiments, the communication interface module 400 is connected to the oil quantity testing system via a serial bus.
[0092] The advantage of this embodiment is that the communication interface module 400 is connected to the oil quantity testing system via a serial bus. The common-mode interference immunity of the serial bus (such as twisted pair) is used to suppress electromagnetic noise interference to the transmission, thereby improving the stability of data transmission and thus improving the reliability of the oil quantity sensing circuit.
[0093] In some embodiments, the serial bus may specifically include a CAN bus or an RS422 bus. The serial bus may also include other types of buses, and is not limited thereto. In another embodiment, the communication interface module 400 may also be wirelessly connected to the oil quantity testing system; this application embodiment does not limit this.
[0094] This application also provides a fuel level sensor, which includes the fuel level sensing circuit described above.
[0095] The specific implementation of this fuel level sensor is basically the same as the specific embodiment of the fuel level sensing circuit described above, and will not be repeated here.
[0096] It should be noted that the software tools or components not belonging to our company that appear in the embodiments of this application are merely examples and do not represent actual use.
[0097] The embodiments described in this application are intended to more clearly illustrate the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those skilled in the art will know that with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.
[0098] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.
[0099] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.
[0100] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.
[0101] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0102] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.
[0103] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. The coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, or indirect coupling or communication connection between the apparatus or units, and may be electrical, mechanical, or other forms.
[0104] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0105] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.
[0106] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.
[0107] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.
Claims
1. A fuel level sensing circuit, characterized in that, The fuel level sensing circuit includes: Oil level detection module, pressure detection module, and signal processing module; The signal processing module is electrically connected to the oil quantity detection module and the pressure detection module; The pressure detection module is used to detect the environmental pressure of the target fuel tank and obtain a pressure signal; the fuel quantity detection module is used to detect the fuel quantity of the target fuel tank and obtain an initial fuel quantity; the signal processing module is used to perform fuel quantity calibration calculation based on the pressure signal and the initial fuel quantity to obtain the target fuel quantity.
2. The fuel level sensing circuit according to claim 1, characterized in that, The pressure detection module includes a pressure sensor, a compensation unit, and a voltage amplification unit; The pressure sensor is electrically connected to the compensation unit, the compensation unit is electrically connected to the voltage amplification unit, and the voltage amplification unit is electrically connected to the signal processing module; The pressure sensor is used to detect the ambient pressure of the target oil tank; the compensation unit is used to perform zero-point temperature drift compensation based on the ambient pressure to obtain a compensation voltage; the voltage amplification unit is used to amplify the compensation voltage to obtain the pressure signal.
3. The oil level sensing circuit according to claim 2, characterized in that, The pressure sensor includes a first strain gauge, a second strain gauge, a third strain gauge, and a fourth strain gauge; the compensation unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor. One end of the first strain gauge is electrically connected to one end of the second strain gauge, one end of the first resistor, one end of the second resistor, and one end of the fifth resistor; The other end of the first strain gauge is electrically connected to one end of the third strain gauge, the other end of the second resistor, and the voltage amplification unit; The other end of the second strain gauge is electrically connected to one end of the fourth strain gauge, the other end of the first resistor, and the voltage amplification unit; the other end of the third strain gauge is electrically connected to one end of the fourth resistor. The other end of the fourth strain gauge is electrically connected to one end of the third resistor; the other end of the third resistor, the other end of the fourth resistor, and the other end of the fifth resistor are grounded.
4. The oil level sensing circuit according to claim 2, characterized in that, The voltage amplification unit includes an operational amplifier; The input terminal of the operational amplifier is electrically connected to the compensation unit, and the output terminal of the operational amplifier is electrically connected to the signal processing module.
5. The oil level sensing circuit according to claim 2, characterized in that, The pressure sensor includes a diffused silicon pressure sensor.
6. The fuel level sensing circuit according to any one of claims 1 to 5, characterized in that, The fuel level sensing circuit also includes: a communication interface module; The signal processing module is electrically connected to the communication interface module, which is used for communication connection to the oil quantity testing system. The signal processing module is also used to detect abnormal signals based on the pressure signal and the target oil quantity to generate oil quantity measurement fault information; the communication interface module is used to send the oil quantity measurement fault information to the oil quantity testing system.
7. The fuel level sensing circuit according to claim 6, characterized in that, The fuel level sensing circuit also includes: a power supply filtering module; The power filtering module is electrically connected to the communication interface module and the signal processing module; The communication interface module is also used to acquire the input voltage, and the power supply filtering module is used to filter the input voltage to supply power to the signal processing module.
8. The oil level sensing circuit according to claim 7, characterized in that, The fuel level sensing circuit also includes: a power conversion module; The power conversion module is electrically connected to the power filtering module and the signal processing module; the power conversion module is used to convert the input voltage to supply power to the signal processing module.
9. The fuel level sensing circuit according to claim 6, characterized in that, The communication interface module is connected to the oil quantity testing system via a serial bus.
10. A fuel level sensor, characterized in that, The fuel level sensor includes the fuel level sensing circuit according to any one of claims 1 to 9.