Liquid level measuring device for underwater vehicle water tank

Abstract

The application relates to the technical field of volume measurement, and discloses a liquid level metering device of a water tank of an underwater vehicle, which comprises a shell, a supporting mother plate, a power supply filter, a power supply circuit board and a control circuit board. The power supply circuit board and the control circuit board are detachably connected with the supporting mother plate. A power supply loop is arranged on the power supply circuit board, and a control loop is arranged on the control circuit board. When the liquid level metering device is in a working state, the power supply filter, the power supply loop, the control loop, a self-checking switch and an operating state indicating lamp form a series system. The average failure interval time of the liquid level metering device is determined based on the reciprocal of the device failure rate, and the device failure rate is obtained by summing the component failure rates of each component in the liquid level metering device. Therefore, the reliability and the precision of the liquid level metering device of the water tank of the underwater vehicle under extreme conditions are improved, and the stability and the controllability of the underwater vehicle are further ensured.

Description

Technical Field

[0001] This application relates to the field of volume measurement technology, and in particular to a liquid level measuring device for the water tank of an underwater vehicle. Background Technology

[0002] Underwater vehicles, such as submarines, need to control their buoyancy and maintain balance by adjusting the water level in their ballast tanks when navigating underwater. This is especially important when underwater vehicles are carrying different payloads. To ensure the stability and maneuverability of underwater vehicles, the volume of the liquid in the ballast tanks must be accurately measured.

[0003] To this end, underwater vehicles are equipped with water tank level and volume measurement devices, which use various sensors (such as ultrasonic or pressure sensors) to measure the height of the liquid inside the tank. By combining this data with the tank's geometry, the liquid volume can be calculated. Simultaneously, the device records changes in liquid level and volume, providing crucial historical data for the underwater vehicle's operators.

[0004] However, in related technologies, the reliability and accuracy of tank level capacity devices that can remotely measure the water volume in tilt balance tanks and buoyancy adjustment tanks for extreme conditions (such as underwater pressure environments) still need to be further improved. Summary of the Invention

[0005] This application aims to at least partially solve one of the technical problems in the related art. To this end, this application proposes a liquid level measuring device for the water tank of an underwater vehicle. The main technical solution adopted in this application includes:

[0006] This application provides a liquid level metering device for the water tank of an underwater vehicle. The device includes a housing, a support plate, a power filter, a power circuit board, and a control circuit board. The support plate, power filter, power circuit board, and control circuit board are disposed within the housing. The support plate is fixedly connected to the housing. The power circuit board and control circuit board are detachably connected to the support plate. The power circuit board has a power circuit, and the control circuit board has a control circuit. The housing includes a control panel. The control panel has an external connector, a power switch, a self-test switch, and a running status indicator light. The external connector, power switch, self-test switch, and running status indicator light are connected to the support plate. When the liquid level metering device is in operation, the power switch, power filter, power circuit, control circuit, and running status indicator light form a series system. The device failure rate of the liquid level metering device is obtained by summing the component failure rates of each component in the liquid level metering device, and the average fault interval time of the liquid level metering device is determined based on the reciprocal of the device failure rate.

[0007] In the above embodiments, a liquid level metering device for the water tank of an underwater vehicle is proposed for extreme underwater environments. The device includes a housing, a support base plate, a power filter, a power circuit board, and a control circuit board. The support base plate, power filter, power circuit board, and control circuit board are housed within the housing. The power circuit board and control circuit board are detachably connected to the support base plate. The power circuit board has a power circuit, and the control circuit board has a control circuit. The housing includes a control panel. The control panel has an external connector, a power switch, a self-test switch, and a running status indicator light, all of which are connected to the support base plate. When the liquid level metering device is in operation, the power filter, power circuit, control circuit, self-test switch, and running status indicator light form a series system. The device failure rate of the liquid level metering device is obtained by summing the component failure rates of each component within the device. The average time between failures (MTBF) of the liquid level metering device is determined based on the reciprocal of the device failure rate. This improves the reliability and accuracy of the liquid level metering device in the water tank of an underwater vehicle under extreme conditions, further ensuring the stability and maneuverability of the underwater vehicle. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0009] Figure 1a This is a structural block diagram of a liquid level metering device for an underwater vehicle's water tank according to an embodiment of this application;

[0010] Figure 1b This is a structural diagram of the housing and panel of a liquid level metering device for an underwater vehicle's water tank according to an embodiment of this application;

[0011] Figure 1c The present application provides an electrical schematic diagram of a power filter according to one embodiment of the present application.

[0012] Figure 1d This is a schematic diagram illustrating the detachable connection between a control circuit board, a power circuit board, and a support motherboard according to an embodiment of this application.

[0013] Figure 1e The circuit diagram of a power supply loop provided according to an embodiment of this application is shown below.

[0014] Figure 1f This is a structural block diagram of a control loop provided according to an embodiment of this application;

[0015] Figure 1g The circuit schematic of a self-test unit provided according to an embodiment of this application is shown below.

[0016] Figure 1h This is a circuit schematic diagram of an LED control unit according to an embodiment of this application;

[0017] Figure 1i This is a reliability block diagram of a serial system provided according to an embodiment of this application;

[0018] Figure 2a The present application provides a circuit schematic diagram of an RS422 communication circuit according to an embodiment of the present application.

[0019] Figure 2b The present application provides a circuit schematic diagram of a CAN communication circuit according to one embodiment.

[0020] Figure 3a This is a circuit schematic diagram of a first rectangular terminal according to an embodiment of the present application;

[0021] Figure 3b This is a circuit schematic diagram of a second rectangular terminal according to an embodiment of this application;

[0022] Figure 4 This is a circuit schematic diagram of a third rectangular terminal according to an embodiment of this application;

[0023] Figure 5 This is a circuit schematic diagram of a signal isolation module according to an embodiment of this application;

[0024] Figure 6a This is a circuit schematic diagram of a fourth rectangular terminal according to an embodiment of this application;

[0025] Figure 6b This is a circuit diagram of a running status indicator light according to an embodiment of this application. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] When underwater vehicles navigate, they need to control their buoyancy and maintain balance by adjusting the water level in their ballast tanks. This is especially important when underwater vehicles are carrying different payloads. To ensure the stability and maneuverability of underwater vehicles, the volume of the liquid in the ballast tanks must be accurately measured to accurately calculate the weight and center of gravity of the underwater vehicle. For this purpose, underwater vehicles are equipped with ballast tank level and volume measurement devices, which use various sensors (such as ultrasonic or pressure sensors) to measure the height of the liquid in the ballast tanks. Using this data, combined with the geometry of the ballast tanks, the volume of the liquid can be calculated. Simultaneously, the device records changes in liquid level and volume, providing crucial historical data for the operators of the underwater vehicle.

[0028] However, in related technologies, the reliability and accuracy of tank level and capacity devices capable of remotely measuring the water volume in tilt-balance tanks and buoyancy-adjusting tanks under extreme conditions (such as underwater pressure environments) still need further improvement. Measurement methods in related technologies, such as ultrasonic level measurement and pressure measurement, may be affected by changes in underwater pressure, temperature, and liquid density, leading to measurement errors. Specifically, because the speed of sound propagation in water differs from that in air, ultrasonic sensors are not suitable for underwater environments and may be affected by underwater pressure; furthermore, the sensing accuracy of ultrasonic sensors is affected by soft materials, and its accuracy is also affected by temperature changes of 5-10 degrees Celsius or more. Pressure sensors may require specific mechanical considerations in extreme underwater pressure environments to prevent material damage due to pressure; and the low oxygen content in the deep sea may lead to pitting and cracking. After the equipment is removed, atmospheric oxygen enters the equipment and begins the corrosion process, causing errors in the results. In addition, the accuracy, stability, and anti-interference capabilities of various sensors themselves are also important factors limiting their application under extreme conditions.

[0029] Based on this, according to an embodiment of this application, a liquid level measuring device for the water tank of an underwater vehicle is provided, such as... Figure 1a As shown, the liquid level metering device 100 of the underwater vehicle's water tank includes: a housing 102, a support plate 104, a power filter 106, a power circuit board 108, and a control circuit board 110; the support plate 104, the power filter 106, the power circuit board 108, and the control circuit board 110 are disposed inside the housing 102.

[0030] The housing can be an external structure used to house and protect the various components inside the liquid level metering device. Specifically, an integrated platform or box-like structure resistant to electromagnetic interference can be selected as the housing of the liquid level metering device. For example, please refer to... Figure 1b An integrated box structure made of 6061 aluminum alloy material, which is resistant to electromagnetic interference, is selected as the housing 102 structure of the liquid level metering device.

[0031] The support motherboard can refer to a plate-like structure that provides fixed support for the main components of the liquid level metering device, used to support, fix, and connect other electronic components or circuit boards. For example, a flat plate made of metal or plastic that fixes circuit boards and other components can be selected as the support motherboard; a PCB circuit board with circuit traces, component mounting positions, and multiple rectangular connector terminals can also be selected as the support motherboard; or a backplane that connects multiple plug-in terminals or subsystems and provides power connection and signal distribution can be selected as the support motherboard 104.

[0032] A power filter can be used to suppress noise and interference in the power grid, while preventing interference generated by electronic devices from feeding back into the power grid. Specifically, the power filter is connected at the inlet of the power line entering the level metering device to receive and filter the incoming AC 220V power. For example, please refer to... Figure 1c The YLLCA12092A-1 from Beijing Yuanliu Hongyuan Electronics can be used as the power filter 106. One end of the filter is connected to an external power supply device 103 via a load resistor 101 and a power switch 120. The other end can be connected to a connection terminal 105 suitable for connection to a power circuit board, so as to deliver the power supply after filtering out noise and interference from the power grid to the power circuit board for subsequent conversion and distribution.

[0033] The power supply circuit board 108 can refer to a PCB circuit board used to convert external power into DC power required by electronic devices and to ensure the stability and purity of the power supply. Specifically, the power supply circuit board includes a rectifier or voltage regulator and integrates components such as power filters, inductors, and capacitors to convert the externally input AC220V AC power into DC24V DC power required by the control circuit board and other electronic components.

[0034] The control circuit board 110 is used to receive, process, and transmit signals to control the operation of the entire system. Specifically, the control circuit board 110 receives a 4-20mA current signal containing the water tank level information from the primary instrument via an interface, and processes the received signal through the microcontroller (MCU) inside the circuit board, including filtering, amplification, and analog-to-digital conversion (ADC). Further, the microcontroller (MCU) chip calculates the water volume corresponding to the water level based on the tank's capacity curve, analyzes the data, and determines whether an empty / full alarm signal needs to be issued. During this process, the control circuit board 110 also exchanges data with the host computer system via a communication interface (e.g., RS422 or CAN bus), sending processed water level and volume information, and receiving control commands from the host computer.

[0035] The support mother plate 104 is fixedly connected to the housing 102, and the power circuit board 108 and the control circuit board 110 are detachably connected to the support mother plate 104.

[0036] Specifically, the support plate 104 and the housing 102 can be mechanically fixed together. For example, they can be connected by screws, clips, or welding to resist vibrations and impacts that the underwater vehicle may encounter during underwater navigation, ensuring the stability and robustness of the entire internal structure. Furthermore, the power circuit board 108 and the control circuit board 110 are detachably connected to the support plate 104, as described in [reference needed]. Figure 1d Specific rectangular connectors are used to connect the support motherboard 104 to the power circuit board 108 and the control circuit board 110 via the terminals of the rectangular connectors. This allows for a secure yet easy-to-disassemble connection between the support motherboard 104 and these circuit boards, facilitating maintenance and upgrades. Similarly, the detachable connection method allows for convenient assembly and disassembly of internal components. When replacing or repairing the power circuit board or control circuit board, simply unplug the corresponding rectangular connector from the support motherboard to remove the circuit board. Optionally, due to the use of rectangular connectors for circuit connections, each rectangular connector can be configured with different key positions for different circuit boards.

[0037] The power circuit board 108 is provided with a power circuit 112, and the control circuit board 110 is provided with a control circuit 114.

[0038] The power supply circuit 112 can be a circuit section in the power supply circuit board 108 used for providing and distributing power. Specifically, the power supply circuit 112 converts externally input AC220V AC power into DC24V DC power required by the control circuit board and other electronic components. For example, please refer to... Figure 1eThe power supply circuit 112 includes a voltage conversion chip U2, one end of which is adapted to connect to an external AC220V power supply. After voltage conversion, it outputs a DC24V power supply to power the control circuit board and other electronic components. Optionally, the power supply circuit 112 also includes an overvoltage suppression unit 107, located between the external power supply and the voltage conversion chip U2, to protect electronic equipment from voltage spikes and overvoltage damage. The overvoltage suppression unit 107 includes a rear-film fuse SVR240-100, which acts as a fuse. When the voltage exceeds a certain value, its resistance drops sharply, thereby limiting further voltage increases and protecting subsequent circuits from high voltage damage. The overvoltage suppression unit 107 also includes a varistor FTR14D471K, which can quickly conduct when a voltage spike occurs, guiding the overvoltage to ground, thereby protecting the circuit. Furthermore, the externally input AC220V power supply is fed into the EMC filter U1 after passing through the overvoltage suppression unit 107. The EMC filter U1 further reduces noise interference before inputting the processed power supply into the voltage conversion chip U2, ultimately converting the AC220V power supply into DC24V to power the various systems and sub-components of the level metering device. Optionally, the power circuit 112 may also include a power indicator 108, which illuminates when the power circuit is working normally and turns off when the power circuit is not working normally.

[0039] Control loop 114 can refer to the circuit part that controls the operating state of various parts of the liquid level metering device system according to input signals, preset programs, or external commands to perform specific tasks or actions. For details, please refer to... Figure 1f The control loop 114 includes an external primary instrument power supply unit 109, a signal acquisition unit 111, an MCU chip 113, a storage unit 115, a self-test unit 117, a communication unit 119, and an LED control unit 121. The external primary instrument power supply unit 109, signal acquisition unit 111, storage unit 115, self-test unit 117, communication unit 119, and LED control unit 121 are all connected to the MCU chip 113.

[0040] The external primary instrument power supply unit 109 refers to a circuit structure responsible for supplying power to external primary instruments so that they can function properly. The external primary instrument can be a sensor or transmitter directly installed in a water tank or liquid storage container to measure liquid level. Specifically, the external primary instrument can convert changes in liquid level into electrical signals based on collected data for subsequent processing. For example, the external primary instrument can be a float-type level gauge that uses the up-and-down movement of a float to measure liquid level, with the float's position mechanically converted into an electrical signal; or it can be a pressure-type level gauge that measures liquid level based on the relationship between liquid static pressure and liquid level height using a pressure sensor. Further, the external primary instrument power supply unit 109 includes an isolated and regulated output power supply module, one end of which is adapted to connect to the output of the power supply circuit, and the other end is adapted to connect to the external primary instrument, for supplying the external primary instrument with isolated and regulated DC 24V power from the power supply circuit. For example, the isolated regulated output power supply module can be a CFDA30-24S24DC power module type DC / DC isolated regulator.

[0041] The signal acquisition unit 111 can refer to a circuit structure in which one end is adapted to connect to an external primary instrument and the other end is adapted to connect to an MCU chip 113, for acquiring a 4-20mA current signal from the primary instrument, performing preliminary processing, and inputting the signal to the MCU chip 113. Optionally, the signal acquisition unit 111 may include a signal isolation module and an analog-to-digital conversion module.

[0042] The MCU chip 113 refers to a circuit component connected to all other units, used to process all input signals, execute control algorithms, make decisions, and control outputs. Specifically, the MCU chip 113 can receive signals containing water tank level information collected by the signal acquisition unit 111, filter and correct these signals based on pre-programmed software, and send them to the host computer for further data processing. The MCU chip 113 can also control other units to work collaboratively according to pre-programmed instructions to ensure that the water level metering device can operate normally, further realizing the measurement of the water level and capacity of the underwater vehicle's water tank. For example, the CS32F103VB chip from the 58th Research Institute of China Electronics Technology Group Corporation can be selected as the MCU chip 113. This MCU chip uses a high-performance ARM Cortex-M3 32-bit RISC core with a maximum operating frequency of 72MHz. It has built-in high-speed memory (up to 128KB of flash memory and 20KB of SRAM), rich enhanced I / O ports and many peripherals connected to two APB buses, including two 12-bit ADCs, three general-purpose 16-bit timers and one PWM timer. In addition, it also includes many standard communication interfaces: two I2C interfaces and one SPI interface, three USART interfaces, one USB interface and one CAN interface.

[0043] The storage unit 115 can be a circuit structure used to store system configuration data, historical records, calibration parameters, and other information. Specifically, the storage unit 115 communicates with the MCU chip 113 via an IIC interface, allowing the MCU chip 113 to read and write the stored data, thus realizing data storage and retrieval. For example, the storage unit 115 can be a BL24CM1A type EEPROM memory with a storage capacity of 1M bit, an erase / write cycle of up to 1 million times, and a data retention time of over 100 years, ensuring that data can still be effectively stored even if the MCU chip loses power.

[0044] The self-test unit 117 can be a circuit structure that performs a self-test operation on the system based on an external self-test switch signal to check whether each part is working properly, so that the MCU chip can report the error to the host computer when a fault is detected. For example, please refer to... Figure 1gThe self-test unit 117 may include a protection circuit module 123 and an RC filter circuit module 125. The protection circuit module 123 consists of transient voltage suppression diodes TVS1 and TVS2, connected in parallel in the circuit to protect subsequent circuits from damage due to excessive voltage. R7, R8, R10, and R11, along with C13, C15, C16, and C17, form the RC filter circuit module 125. Specifically, R7 and R8, together with C13 and C15, form an RC filter circuit to filter out noise on the ZC-IN and ZI-IN lines. Similarly, R10 and R11, together with C16 and C17, form an RC filter circuit to filter out noise on the ZC and ZI lines. Furthermore, an external self-test switch signal is input to the self-test unit 117. After passing through the protection circuit module 123 and the RC filter circuit module 125, the external self-test switch signal is sent to the MCU chip 113 via the connection terminal, where the MCU chip 113 performs a self-test operation.

[0045] The communication unit 119 can refer to a circuit structure used for data communication with a host computer or other external devices, sending measurement results and receiving control commands. Specifically, the communication unit 119 is communicatively connected to the MCU chip 113 to realize data transmission and reception.

[0046] The LED control unit 121 refers to a circuit structure used to control the state of LED indicator lights to display system status information and alarm information. Specifically, the LED control unit 121 is connected to the MCU chip 113, which controls the on / off state of the LEDs according to the system status. For example, please refer to... Figure 1h The LED control unit 121 includes a conversion-optical-coupled isolation module 127 composed of an optocoupler 129 and a photosensitive receiver 131. The optocoupler 129 can be a light-emitting diode (LED) used to modulate the control signal output by the MCU, and the photosensitive receiver 131 can be a phototransistor or a photodiode used to demodulate the signal and convert it into a corresponding electrical signal to drive the LED.

[0047] The housing 102 includes a control panel 116.

[0048] The control panel can be a user interface that allows operators to monitor the device status and detect, set, and control the operating status of the level metering device. For details, please refer to... Figure 1b The control panel 116 is equipped with an external connector 118, a power switch 120, a self-test switch 122, and a running status indicator 124.

[0049] The external connector 118 can be a connector for connecting external devices or systems. For example, the external connector can be a circular connector from the Zhengzhou Aerospace Y27 series. Specifically, the external connector 118 is connected to the support motherboard 104 inside the housing 102 via terminals to ensure that external devices such as sensors, power signals, and communication cables are connected to the internal circuitry of the device for data transmission, power supply, and communication. For example, the external connector for connecting to an external AC220 power supply can be a three-pin circular connector of Y27G-1203ZJBM-B+Y27G-1203TKL-B+Y27-12III-B; the external connector for connecting to an external primary instrument can be a ten-pin circular connector of Y27G-1610ZJBM-B+Y27G-1610TKL-B+Y27-16III-B; and the external connector for connecting to a host computer can be a four-pin circular connector of Y27G-1204ZJBM-B+Y27G-1204TKL-B+Y27-12III-B. The control circuit board inside the housing 102 is connected to the corresponding communication terminal on the support motherboard 104 and transmits data information to the host computer connected to the external connector to realize data communication and transmission.

[0050] The power switch 120 can refer to a toggle switch used to allow an operator to turn the power to the device on or off. Specifically, the power switch 120 is connected to a corresponding rectangular terminal on the support mother plate 104 inside the housing 102, and further connected to a power switch in the power filter 106 to control the power supply to the entire device. For example, a toggle switch from Shanghai Xingyu KN11-101 can be used as the power switch 120.

[0051] Self-test switch 122 can refer to a toggle switch used to activate the liquid level metering device for self-testing to check the device's working status and performance. Similarly, the toggle switch of Shanghai Xingyu KN11-101 can be selected as self-test switch 122.

[0052] The operating status indicator 124 refers to an LED light element used to provide visual feedback and indicate the current operating status of the device. It can display the operating status of the liquid level metering device, such as normal operation, fault, or self-test.

[0053] External connector 118, power switch 120, self-test switch 122, and running status indicator 124 are respectively connected to the support motherboard 104.

[0054] For example, an external primary instrument is connected via an external connector to the corresponding external primary instrument input rectangular terminal on the support motherboard 104 inside the housing 102, thereby inputting a 4-20mA current signal containing the water tank level information to the control circuit board for further processing. An external AC220 power supply is connected via an external connector to the corresponding power rectangular terminal on the support motherboard 104 inside the housing 102 to be input to the power filter, and after further processing, supplies power to the entire device. The control circuit board inside the housing 102 is connected to the corresponding self-test rectangular terminal on the support motherboard 104, and further, inputs the self-test operation signal to the self-test unit 117 in the control loop 114 to start the built-in self-test program. The running status indicator light 124 can be connected to the corresponding indicator light rectangular terminal on the support motherboard 104 inside the housing 102, and further, controlled by the LED control unit 121 and MCU chip 113 in the control loop 114, illuminates or extinguishes the corresponding LED light according to different operating states of the liquid level metering device.

[0055] When the liquid level metering device is in operation, the power switch, power filter, power circuit, control circuit, and operation status indicator light form a series system.

[0056] The series system describes how the power switch 120, power filter 106, power circuit 112, control circuit 114, and operation status indicator 124 are sequentially connected when the entire liquid level metering device 100 is operating normally. This means that to achieve liquid level metering of the underwater vehicle's water tank, each of these circuit components must function properly. Failure or disconnection of any component will cause the entire system to shut down, affecting the normal operation of the device. Specifically, in the series system, to perform the liquid level metering process of the underwater vehicle's water tank, the power switch must first be turned on, allowing external AC220 DC power to be input to the power filter to remove noise and interference from the power line, ensuring power stability. Next, the power circuit performs power conversion and distribution on the external AC220 DC power, converting the filtered power into the voltage required by the device and distributing it to the control circuit 114 and other components of the liquid level metering device. The control circuit receives a 4-20mA current signal containing the water tank's liquid level information from the primary instrument. The received signal is processed by the MCU chip inside the control circuit, including filtering, amplification, and analog-to-digital conversion. Furthermore, the MCU chip calculates the water volume corresponding to the liquid level based on the tank's capacity curve, analyzes the data, and determines whether an empty / full alarm signal needs to be issued. Optionally, when the system is working normally, the corresponding module's operating status indicator light can remain constantly lit.

[0057] Based on this, the reliability block diagram of the series system can be referred to Figure 1iIt is understandable that the failure rate of the liquid level metering device 100 is obtained by summing the failure rates of each component in the liquid level metering device. Specifically, its basic reliability model is as follows:

[0058]

[0059] Where, λ S The failure rate of the entire liquid level metering device; λ i Let be the failure rate of the i-th unit in the liquid level metering device.

[0060] It is understandable that, since the power switch, power filter, power circuit, control circuit, and operating status indicator light form a series system, any component that fails must be replaced. Therefore, the mean time between failures (MTBF) can be used as a reliability indicator for the level metering device. Because the MTBF of the level metering device is determined based on the reciprocal of the device's failure rate, the formula for calculating the MTBF of the level metering device is as follows:

[0061]

[0062] Where MTBF is the fault interval time of the level metering device; λ S The failure rate of the entire liquid level metering device; λ i Let be the failure rate of the i-th unit in the liquid level metering device.

[0063] In the above embodiments, a liquid level metering device for the water tank of an underwater vehicle is proposed for extreme underwater environments. The device includes a housing, a support plate, a power filter, a power circuit board, and a control circuit board. The support plate, power filter, power circuit board, and control circuit board are housed within the housing. The power circuit board and control circuit board are detachably connected to the support plate. The power circuit board has a power circuit, and the control circuit board has a control circuit. The housing includes a control panel. The control panel has an external connector, a power switch, a self-test switch, and a running status indicator light, all of which are connected to the support plate. When the liquid level metering device is in operation, the power filter, power circuit, control circuit, self-test switch, and running status indicator light form a series system. The device failure rate of the liquid level metering device is obtained by summing the component failure rates of each component within the device. The average time between failures (MTBF) of the liquid level metering device is determined based on the reciprocal of the device failure rate. This improves the reliability and accuracy of the liquid level metering device in the water tank of an underwater vehicle under extreme conditions, further ensuring the stability and maneuverability of the underwater vehicle.

[0064] In some implementations, it should be understood that since the external connectors, power switches, self-test switches, and operating status indicator lights are respectively connected to the support motherboard, and the support motherboard is fixedly connected to the housing, while the power circuit board and control circuit board are detachably connected to the support motherboard, the durability of the support motherboard is a key factor affecting the service life of the liquid level metering device, as the quality and lifespan of the support motherboard directly affect the reliability and long-term performance of the entire liquid level metering device.

[0065] Based on this, a method is proposed that can analyze the quality and service life of the support base plate from multiple dimensions to extend its service life. This includes:

[0066] S110. Obtain the preset dimension feature data of the supporting motherboard in multiple preset dimensions.

[0067] The multiple preset dimensions can be various attribute dimensions predefined during the analysis process to evaluate different aspects of the support plate's quality and service life. The preset dimension feature data can be feature data used to quantitatively evaluate the specific types of damage that different preset dimensions can cause to the support plate. Specific types of damage can be understood as the damage to the support plate caused when the liquid level metering device is within an inappropriate parameter range of a preset dimension while the underwater vehicle is navigating underwater.

[0068] The following example illustrates how to select a preset dimension. Since the liquid level metering device is used in an underwater vehicle environment, the preset dimension can be a material property. Therefore, the preset dimension feature data can be material property data, including the tensile strength, temperature range, and corrosion resistance of the material used in the support plate.

[0069] Similarly, the preset dimension can also be a design parameter attribute, and the preset dimension feature data can be design parameter data, including the stress distribution of the supporting mother plate structure, durability test results, etc.

[0070] The preset dimensions can also be manufacturing process attributes. In this case, the preset dimension feature data can be manufacturing process data, including the welding quality of the support mother plate, the material processing precision, etc. Specifically, the preset dimension feature data of the support mother plate in multiple preset dimensions can be obtained by pre-testing a test plate made of the same material as the support mother plate in the underwater environment of the sample.

[0071] S120. Based on all preset dimension feature data, perform analysis and processing to obtain target integrated feature data.

[0072] Among them, the target integrated feature data can be a dataset that describes the result of comprehensive analysis and processing of multiple preset dimension feature data of the support motherboard. It reflects the key characteristics and performance indicators of the support motherboard obtained from multiple perspectives and can be used to further analyze and evaluate the service life of the support motherboard.

[0073] Specifically, data cleaning and normalization can be performed on the feature data of each preset dimension to ensure data consistency and comparability. Furthermore, correlation analysis, based on the Pearson correlation method, can be used to extract the key features most representative of the quality and service life of the support substrate from the original data by comparing correlation values, and error values ​​with low correlation are removed. Finally, feature fusion is performed on the extracted feature data of multiple preset dimensions to obtain target integrated feature data that reflects the quality and service life of the support substrate across multiple preset dimensions.

[0074] S130. Based on the target integrated feature data, perform similarity analysis with the first integrated feature data to obtain the first similarity data; perform similarity analysis with the second integrated feature data to obtain the second similarity data.

[0075] The first and second integrated feature data are two specific datasets that can represent the integration of test results data for healthy and unhealthy support motherboards across all preset dimensions, respectively. For example, the first integrated feature data can refer to a collection of test and measurement data from a healthy support motherboard, encompassing all preset dimensions. This first integrated feature data can reflect the performance characteristics of the support motherboard under optimal or standard operating conditions. Conversely, the second integrated feature data can refer to a collection of test and measurement data from an unhealthy support motherboard, encompassing all preset dimensions. This second integrated feature data can reveal the performance characteristics of the support motherboard under suboptimal or faulty conditions.

[0076] Furthermore, based on the target integrated feature data, similarity analysis is performed with the first integrated feature data and the second integrated feature data respectively to obtain first similarity data and second similarity data. The first similarity data and second similarity data can be similarity values, which can be used to evaluate the degree of similarity between the target integrated feature data and test data in healthy and unhealthy states.

[0077] S140. Target evaluation data is obtained based on the first similarity data and the second similarity data.

[0078] The target assessment data can be a comprehensive assessment reflecting the health status, performance level, and potential risks of the support base plate. For example, the target assessment data can be "healthy" or "unhealthy"; it can also be health level data, including Level 1 (very healthy, requiring no maintenance), Level 2 (relatively healthy, requiring inspection), Level 3 (requiring repair), Level 4 (relatively unhealthy, requiring urgent repair), and Level 5 (indicating failure). Furthermore, based on the target assessment data, maintenance personnel can be guided to conduct overhauls of the underwater vehicle's water tank level metering device to ensure its normal operation. Similarly, the target assessment data can be used to determine suitable operating modes for the underwater vehicle's water tank level metering device, and corresponding control measures can be used to guide the subsequent operation of the device, thereby extending the lifespan of the support base plate.

[0079] In the above embodiments, by collecting and analyzing multiple preset dimension feature data, and based on different integrated feature data that include the comprehensive performance of healthy and unhealthy support motherboards, the quality and service life of the support motherboards are comprehensively evaluated, thereby taking corresponding measures to extend their service life. Furthermore, the reliability and accuracy of the underwater vehicle's water tank level metering device under extreme conditions are improved, further ensuring the stability and maneuverability of the underwater vehicle.

[0080] In some implementations, the support motherboard has an RS422 communication port and a CAN communication port, and the control circuit board is equipped with RS422 communication circuits and CAN communication circuits.

[0081] The RS422 communication port can be a rectangular terminal for implementing serial communication according to the RS422 standard. The RS422 communication circuit can be a circuit section located on the control circuit board for encoding and decoding communication signals according to the RS422 standard. Further, the RS422 communication circuit is connected to the RS422 communication port. For example, the RS422 communication circuit uses a two-channel GLb2682P RS422 transceiver; taking one channel as an example... Figure 2a This is the circuit diagram of the RS422 communication circuit on the control circuit board. Please refer to it. Figure 2aThis transceiver is a highly integrated, high-speed 16Mbps RS422 bus transceiver, compliant with ANSI IA / EIA-485-A-98 and ISO 8482:1987(E) standards, and supports over ±8kV ESD protection on bus pins as well as signal and power isolation. Optionally, the transceiver also integrates a 3-channel isolator, a tri-state differential line driver, a differential input receiver, and an isolated DC-DC converter, allowing for a single 3.3V power supply. This enables a fully integrated signal and power isolated RS-422 solution, ensuring reliable data communication for underwater vehicle water tank level gauges under extreme conditions.

[0082] Similarly, the CAN communication port can be a rectangular terminal used to implement the communication function of the CAN protocol. The CAN communication circuit can be a circuit section located on the control circuit board that processes signals conforming to the CAN protocol, manages the transmission and reception of data frames on the network, and ensures the consistency of data communication between nodes on the network. Further, the CAN communication circuit is connected to the CAN communication port. For example, Figure 2b This is the circuit diagram of the CAN communication circuit on the control circuit board. Please refer to it. Figure 2b The CAN communication circuit uses a single GLb3053P CAN transceiver, a fully integrated isolated Controller Area Network (CAN) physical layer transceiver. The chip integrates an isolated DC / DC power supply and conforms to the ISO11898-2 standard. This chip integrates a digital isolator, CAN transceiver, and isolated DC / DC converter into a single-chip package, with an internal 5V DC / DC power supply, providing a fully isolated CAN communication solution. Optionally, the GLb3053P creates a fully isolated interface between the CAN protocol controller and the physical layer bus, enabling communication at a maximum data rate of 1Mbps, ensuring the reliability of data communication for the underwater vehicle's water tank level metering device under extreme conditions.

[0083] The above implementation provides two communication methods: RS422 communication and CAN communication. These two methods are independent and do not affect each other. This is suitable for point-to-multipoint, long-distance, and high-interference-resistance applications, as well as network environments that meet the requirements of multiple master controllers, high reliability, and real-time performance. This constitutes a redundant communication method; if one communication method fails, the other can serve as a backup, ensuring communication continuity and reliability. This is crucial for applications like underwater vehicles, where safety and stability are extremely important.

[0084] In some implementations, the RS422 communication port and the CAN communication port share a single operating status indicator light.

[0085] The operating status indicator light refers to an LED light element used to provide visual feedback and indicate the current operating status of the device. It can display the operating status of the liquid level metering device, such as normal operation, fault, or self-test. For example, a red LED light of the GQ8T-D / R / DC24V / S can be used as the operating status indicator light.

[0086] Specifically, when both the RS422 and CAN communication ports are inactive, the status indicator light will be off or flashing. For example, when neither the RS422 nor CAN communication port is activated or transmitting data, the status indicator light may be off to indicate no communication activity. When either the RS422 or CAN communication port is active and transmitting data, the status indicator light may be steadily lit to indicate communication activity. If either the RS422 or CAN communication port is inactive, or if both are faulty, the status indicator light may flash in different ways to indicate the fault or abnormality, reminding the operator that there is currently no communication activity.

[0087] In the above embodiments, the circuit status is indicated by an indicator light, providing an intuitive way to monitor the device's communication status. When different communication failures occur, operators can quickly identify the problem through the indicator light's status, enhancing the interactivity between the operator and the device. Furthermore, by sharing a single indicator light, space and resources are maximized, making it more suitable for the limited environment inside underwater vehicles.

[0088] In some embodiments, a first rectangular terminal and a second rectangular terminal are provided on the support motherboard. The first rectangular terminal is adapted to a power circuit board, and the second rectangular terminal is adapted to a control circuit board.

[0089] The first and second rectangular terminals can be connection ports of specific rectangular connectors. Using these connectors, the support motherboard connects to the power circuit board via the first rectangular terminal and to the control circuit board via the second rectangular terminal. When the power circuit board or control circuit board needs to be replaced or repaired, the corresponding circuit board can be removed simply by unplugging the rectangular connector from the corresponding terminal on the support motherboard. Optionally, the first and second rectangular terminals can be configured with different key positions for different circuit boards. For example... Figure 3a This is the circuit schematic of the first rectangular terminal. Figure 3b This is the circuit diagram for the second rectangular terminal; please refer to it. Figure 3a and Figure 3bAs can be seen, the rectangular terminals adapted to different circuit boards are different, and thus the insertion methods of each circuit board on the support motherboard are also different.

[0090] In the above embodiments, the design achieves a high degree of modularity by using rectangular terminals adapted to different circuit boards, simplifying the process of replacing and upgrading circuit boards. Furthermore, because each circuit board only needs to be connected to the corresponding rectangular terminal, eliminating the need for complex hard-wired connections, technicians can quickly assemble and maintain the device. This also reduces malfunctions caused by incorrect hard-wired connections, thereby improving reliability. Additionally, the terminal connections typically have locking mechanisms to prevent accidental disconnection or poor contact.

[0091] In some embodiments, a third rectangular terminal is provided on the support motherboard, and there are multiple external connectors adapted to connect to sensors for measuring water levels. The external connectors are connected to the third rectangular terminal.

[0092] Similarly, the third rectangular terminal can also be a connection port of a specific rectangular connector for connecting multiple external connectors. The external connectors can be circular connectors for connecting external devices or systems, suitable for connecting multiple sensors for measuring water levels, i.e., multiple external primary instruments. For example, please refer to... Figure 4 The third rectangular terminal can be a terminal of model RC045-8ZJB, RC045-6ZJB and RC045-10ZJB. Eight external primary instruments (sensors) are connected to different corresponding third rectangular terminals on the support motherboard 104 inside the housing 102 through external connectors, so as to input a 4-20mA current signal containing the liquid level information of the water tank to the control circuit board for subsequent processing.

[0093] Optionally, the water level sensor can also be a water level detection device, including multiple detection sub-modules, a processing module, and a pre-buffer unit. Each detection sub-module includes a signal conversion unit. The signal conversion unit and the pre-buffer unit share a first transmission path. Specifically, each detection sub-module converts the analog water level signal into a recordable digital electrical signal through its built-in signal conversion unit to obtain water level data. Then, the processor in the water level detection device writes the water level data converted by the multiple signal conversion units to the pre-buffer unit or reads the water level data from the pre-buffer unit through the first transmission path. The water level data in the pre-buffer unit is then output to the data processing module through a second transmission path. The data processing module may include a microcontroller for amplifying, filtering, and converting the input water level data. Further, after processing by the microcontroller in the data processing module, the water level data outputs 4-20mA current data reflecting the water level information, which is finally input to the control circuit board via an external connector through a third rectangular terminal for subsequent processing.

[0094] In the above embodiments, in order to meet the various needs of the underwater vehicle water tank level metering device in practical applications and to ensure the flexibility, reliability and accuracy of the device, multiple external primary instruments are adopted, and there are multiple external connectors. If a sensor or connector fails, the problem can be quickly located and replaced or repaired without disassembling the entire system.

[0095] In some implementations, the control circuit board includes a signal isolation module and an analog-to-digital converter (ADC). The ADC is connected to the MCU chip in the control loop. The signal isolation module is configured to separate, distribute, and convert the instrument signal acquired by any sensor to obtain an isolated signal. The ADC is configured to convert the isolated signal into a digital output. The digital output is transmitted to the MCU chip, which is configured to control the illumination state of the corresponding operating status indicator light for any sensor based on the digital output.

[0096] The signal isolation module refers to a circuit module on a control circuit board used to provide electrical isolation, protect circuits and equipment, and prevent electrical faults and interference. Specifically, one end of the signal isolation module is connected to a corresponding external connector via a third rectangular terminal on the support motherboard, and is adapted to connect to a corresponding external primary instrument. The other end is connected to an analog-to-digital converter module, used to receive instrument signals collected by any sensor, separate, distribute, and convert them, and transmit the isolated signal to the analog-to-digital converter module for further processing. For example, the ISOEM-A7-P1-O7 chip can be selected as the signal isolation module. This module integrates a multi-isolated DC / DC converter power supply and a set of magneto-electrically coupled analog signal isolation transmitters on the same chip. Wide creepage distances on the input and output sides and internal isolation measures enable the chip to achieve 3KVDC triple isolation insulation between the auxiliary power supply and the signal input and signal output, realizing the function of isolating, distributing, and converting signals from each primary instrument. Optionally, please refer to... Figure 5 The signal isolation module also includes transient voltage suppression diodes TVS3 and TVS11, which are connected in parallel in the circuit to form a protection circuit to ensure that subsequent circuits are not damaged by excessive voltage.

[0097] An analog-to-digital converter (ADC) module refers to a circuit module that converts analog signals into digital signals, that is, converts isolated signals into digital outputs. Specifically, one end of the ADC module is connected to the output of the signal isolation module, and the other end is suitable for connecting to an MCU chip in the control loop. For example, the CL1606 chip can be used as the ADC chip for the ADC conversion. This chip integrates a second-order anti-aliasing filter, a track-and-hold amplifier, a 16-bit charge-redistribution successive approximation analog-to-digital converter (ADC), flexible digital filters, a 2.5V reference voltage source, a reference voltage buffer, and high-speed serial and parallel interfaces. All channels of the chip can sample at a throughput rate of up to 200kSPS. The CL1606 has an analog input impedance of 1MΩ. It operates on a single power supply and features on-chip filtering and high input impedance, thus eliminating the need for a driving operational amplifier and an external bipolar power supply. The CL1606 anti-aliasing filter has a 3dB cutoff frequency of 22kHz and also exhibits anti-aliasing suppression characteristics at high sampling rates. Furthermore, its digital filter uses pin-driven operation, which improves the signal-to-noise ratio and reduces bandwidth by 3dB. The analog-to-digital converter (ADC) module converts the isolated 4-20mA current signal into a 0 to ±5V voltage signal, which is then converted into a digital signal by a high-precision ADC chip. Finally, the converted digital signal is transmitted to the MCU chip for subsequent data processing and analysis.

[0098] Optionally, to eliminate interference caused by pulses during the primary instrument data transmission process, when using the MCU chip to perform secondary processing on the digital signal after analog-to-digital conversion, a "limited-amplitude averaging filter method" can be used in software to filter the data, avoiding abnormal fluctuations in the background data display caused by accidental pulses. For example, the design of the limited-amplitude averaging filter method may include the following steps: First, based on experience, determine the maximum allowable deviation value A between two samples; if the difference between the current new sample value and the previous filtering result is ≤ A, then the current sample value is valid, and the current filtering result is set to = the new sample value; if the difference between the current new sample value and the previous filtering result is > A, then the current sample value is invalid, discarding the current new sample value, and the current filtering result is set to = the previous filtering result; further, the collected N sample values ​​are considered as a queue with a fixed length of N. Each new data sample is placed at the tail of the queue, and the previous data at the head of the queue is discarded (first-in, first-out principle). Finally, the N data in the queue are averaged to obtain the new filtered data. Based on the above-mentioned limited-amplitude averaging filter method, the sampling value deviation caused by pulse interference can be eliminated.

[0099] Optionally, each sensor-collected instrument signal has a corresponding operating status indicator light to reflect whether the signal is being transmitted normally. Specifically, based on the digital signal transmitted through the signal isolation module and analog-to-digital conversion module, when an instrument signal containing water tank level information collected by any sensor is input to the MCU chip, and there is no signal input or the input signal exceeds the normal data acquisition range, the MCU chip will control the corresponding operating status indicator light of any sensor to illuminate or flash. It is understandable that if an instrument signal containing water tank level information collected by a sensor is input to the MCU chip but there is no signal input, the reason may be a fault in the external primary instrument power supply. Therefore, in the external primary instrument power supply unit, each circuit has a corresponding operating status indicator light to show whether the primary instrument power supply is normal. Similarly, if the input from a sensor to the MCU chip exceeds the normal data acquisition range, the MCU chip can also control the corresponding operating status indicator light of any sensor to illuminate or flash to warn of the fault.

[0100] In the above implementation, the signal isolation module first isolates the sensor signals, then the analog-to-digital converter converts these isolated analog signals into digital signals, and finally the MCU chip controls the illumination state of the status indicator lights based on these digital signals, thereby achieving real-time monitoring and feedback of the sensor's operating status. This design ensures the accuracy of signal processing and the reliability of the system. Furthermore, each sensor and its corresponding indicator light can be considered a module, facilitating independent management and replacement.

[0101] In some implementations, the instrument signal collected by any sensor corresponds to a preset data collection range. When the instrument signal is within the preset data collection range, the operating status indicator light corresponding to any sensor is turned off.

[0102] If the instrument signal is outside the preset data acquisition range, the operating status indicator light corresponding to any sensor will flash.

[0103] The preset data acquisition range can be a normal operating parameter range or threshold range set based on the instrument signals collected by each sensor. For example, the expected measurement range of each sensor under normal operating conditions, such as the calculated liquid level height range or liquid volume range, can be used as the preset data acquisition range; alternatively, the 4-20mA current signal range containing the liquid level information of the water tank collected by an external primary instrument can be used as the preset data acquisition range.

[0104] Specifically, the signal collected by the external instrument can be transmitted to the host computer at regular intervals, and the host computer can display the device's operating data and status in real time. Simultaneously, based on safety and operational requirements, high and low value limits are set for the sensor outputs to determine whether the sensors are operating normally. Furthermore, if the instrument signal corresponding to any sensor is within the preset data acquisition range, its corresponding operating status indicator is off; if the instrument signal corresponding to any sensor is outside the preset data acquisition range, its corresponding operating status indicator flashes. For example, using a 4-20mA current signal range as the preset data acquisition range, when the instrument signal corresponding to a sensor is within the 4-20mA range, it is considered to be in normal working condition, and its corresponding operating status indicator remains off; when the instrument signal corresponding to a sensor is less than 40mA or greater than 20mA, it is determined to be in an abnormal state, and its corresponding operating status indicator starts flashing.

[0105] In the above implementation, by transmitting signals to the host computer in real time and setting a preset data acquisition range, real-time monitoring of sensor readings is achieved. The display method of the operating status indicator light is determined based on whether the reading is within the range. In other words, by setting a preset data acquisition range, the underwater vehicle's water tank level metering device can ensure that the sensor output is within a controllable and predictable range, ensuring the validity and accuracy of the sensor data and enhancing the reliability and safety of the entire system. This design plays a crucial role in the early detection of potential problems and the prevention of malfunctions.

[0106] In some implementations, the MCU chip communicates with a host computer. When the instrument signal falls below the lower limit of a preset data acquisition range, the host computer receives and displays a disconnection alarm signal from the MCU chip. When the instrument signal exceeds the upper limit of the preset data acquisition range, the host computer receives and displays an over-range alarm signal from the MCU chip.

[0107] The host computer can refer to a computer or control device within a control or metering device that is responsible for issuing control commands and processing data. For example, the host computer can be a personal computer, workstation, PLC (Programmable Logic Controller), or other industrial control equipment, running specific software to manage a device that measures the water tank level and capacity of an underwater vehicle.

[0108] For example, a sensor continuously monitors the water level in the tank and sends an analog signal to the control circuit board. The signal is initially processed by a signal isolation module and an analog-to-digital conversion module, converting the analog signal into a digital signal before sending it to the MCU chip for further processing. The MCU chip then evaluates whether the received signal is within a preset data acquisition range. If the instrument signal is below the lower limit of the preset range, the MCU chip identifies it as a disconnection alarm; if the instrument signal exceeds the upper limit of the preset range, the MCU chip identifies it as an over-range alarm. When such alarms occur, the MCU chip generates a corresponding alarm signal and transmits it to the host computer via a communication interface (such as RS422 or CAN bus). The host computer system then communicates with the corresponding rectangular communication terminal on the support motherboard via an external connector, receives the alarm signal from the MCU chip, processes the received alarm signal, and displays the alarm information on its interface to remind operators to check the relevant sensors or system status and take necessary measures.

[0109] In the above implementation, by displaying alarm information to the host computer interface in real time, operators are promptly notified when sensor signals are abnormal. The underwater vehicle's water tank level metering device ensures accurate monitoring of water level information and immediately notifies operators of any abnormalities, thereby guaranteeing the safe operation and effective management of the underwater vehicle.

[0110] In some embodiments, a fourth rectangular terminal is provided on the support motherboard. Multiple operation status indicator lights are connected to the fourth rectangular terminal.

[0111] Similarly, the fourth rectangular terminal can also be a connection port for a specific rectangular connector, used to connect multiple external connectors. Specifically, there are multiple running status indicator lights, and these multiple running status indicator lights are connected to the fourth rectangular terminal. For example, Figure 6aThis is the circuit diagram supporting the fourth rectangular terminal on the motherboard. Figure 6b This is the circuit diagram for the running status indicator light. Please refer to it. Figure 6a and Figure 6b There are 12 operating status indicator lights. LEDs 1, 2, 3, 4, 5, 6, 7, and 8 represent the operating status of the eight external primary instruments, LED 9 represents the operating status of the control circuit board in the water tank level metering device, LED 10 represents the self-test status of the water tank level metering device, LED 11 represents the power status of the water tank level metering device, and LED 12 represents the communication status between the water tank level metering device and the host computer. Specifically, when the power supply of the water tank level metering device is in normal working condition, LED 11 is constantly lit. When all eight external primary instruments are in normal working condition, LEDs 1, 2, 3, 4, 5, 6, 7, and 8 are all off. When an external primary instrument is disconnected, its corresponding LED is constantly lit. When the instrument signal collected by an external primary instrument is outside the preset data collection range, its corresponding LED flashes. When the water tank level metering device is in self-test mode, LED10 is constantly lit. When both the water tank level metering device and LED10 are constantly lit, LED10 flashes, indicating that the control circuit board is working normally. When the water tank level metering device is communicating normally with the host computer, LED12 flashes; when the water tank level metering device is communicating with the host computer, LED12 is off.

[0112] In the above embodiment, multiple operating status indicator lights visually display the real-time operating status of the water tank level metering device, allowing operators to quickly identify the current status of the device, including sensor status, power supply status, self-test activities, and communication status with the host computer. This clear indication system is crucial for ensuring reliable operation and timely maintenance of the device. Furthermore, it enhances operational intuitiveness, reduces the risk of misoperation, and improves the overall system safety and efficiency.

[0113] In some implementations, when the power switch is on, the self-test switch is triggered, the first operating status indicator light corresponding to the self-test switch is lit, the liquid level metering device enters the self-test state, and the control circuit board runs the pre-programmed self-test program and sends the self-test results to the host computer so that the host computer can determine whether the liquid level metering device is working properly based on the self-test results.

[0114] During the self-test of the liquid level metering device, the second operating status indicator light corresponding to the self-test switch flashes.

[0115] The first operating status indicator can be a status indicator used to indicate the self-test status of the water tank level metering device, and the second operating status indicator can be a status indicator used to indicate the operating status of the control circuit board in the water tank level metering device. The self-test program can be a pre-designed program that includes functional tests of key components such as sensor readings, communication interfaces, and signal processing circuits.

[0116] Specifically, when the power switch is in the ON state and the self-test switch is triggered, the first operating status indicator light corresponding to the self-test switch illuminates, indicating that the liquid level metering device has entered the self-test state. Further, the MCU chip in the control circuit board begins running the pre-programmed self-test program. During this process, the control circuit board sends the self-test results to the host computer via the communication interface. Simultaneously, the host computer receives the self-test results and determines whether the liquid level metering device is working properly based on the received results. If a problem is detected during the self-test, the host computer may display an error code or warning message. For example, the self-test process can be carried out according to the normal liquid level metering process, i.e., an external primary instrument (sensor) monitors the liquid level changes in the water tank in real time and converts the liquid level changes into electrical signals. The electrical signal generated by the sensor is transmitted to the control circuit board via an external connector through the corresponding rectangular terminals on the support motherboard. The signal isolation module and analog-to-digital converter on the control circuit board process the signal, converting the isolated analog signal into a digital signal which is then input to the MCU chip. The MCU chip performs secondary processing according to preset algorithms and programs, such as filtering, calibration, and calculation, and sends the final processed liquid level information data to the host computer via the communication interface. The host computer receives the liquid level data, displays it, and records it. It is understood that when the MCU chip sends liquid level information data to the host computer, it can use a method of sending data packets according to a certain time pattern. When the host computer's backend system receives data packets with a time pattern, the corresponding second operating status indicator light will flash. That is, during the self-test process of the liquid level metering device, the flashing of the second operating status indicator light proves that the control circuit board is functioning normally.

[0117] In the above embodiments, a self-checking process is designed to identify faults or anomalies in the device, such as sensor disconnection, signal out-of-range, or communication failures, thereby allowing for timely repair and replacement. Simultaneously, by performing self-checks periodically, preventative maintenance can be carried out before problems escalate into more serious malfunctions, reducing unexpected downtime. Furthermore, through this continuous process, the underwater vehicle's water tank level metering device ensures accurate monitoring and reporting of the water tank level, guaranteeing stable operation and accurate measurement, and safeguarding the safety and efficiency of the underwater vehicle.

[0118] It should be understood that the liquid level measuring device of the underwater vehicle water tank in this embodiment is presented in the form of a functional unit. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0119] The liquid level measuring device for the water tank of an underwater vehicle, as illustrated in the above embodiments, can be implemented by a computer chip or physical entity, or by a product with a certain function. A typical implementing device is a computer. Specifically, the computer can be, for example, a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email device, game console, tablet computer, wearable device, or any combination of these devices. For ease of description, the above device is described by dividing it into various functional units. Of course, in implementing this application, the functions of each unit can be implemented in one or more software and / or hardware.

[0120] Those skilled in the art will understand that embodiments of this application can be provided as apparatus, method, system, or computer program product. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0121] This application is described with reference to flowchart illustrations and / or block diagrams of apparatuses, methods, devices (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart illustrations and / or one or more block diagrams.

[0122] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0123] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0124] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0125] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. Since they are fundamentally similar to the method embodiments, the descriptions are relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0126] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0127] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A liquid level measuring device for a water tank of an underwater vehicle, characterized by, The device comprises a shell, a support motherboard, a power supply filter, a power supply circuit board and a control circuit board; the support motherboard, the power supply filter, the power supply circuit board and the control circuit board are arranged in the shell; the shell is an integrated box structure made of aluminum alloy material 6061 which is resistant to electromagnetic interference; the support motherboard is fixedly connected with the shell; The power supply circuit board and the control circuit board are respectively detachably connected with the support motherboard, wherein the power supply circuit board is provided with a power supply loop, and the control circuit board is provided with a control loop; the support motherboard is provided with a first rectangular terminal and a second rectangular terminal; the first rectangular terminal is adapted to the power supply circuit board; the second rectangular terminal is adapted to the control circuit board; the durability of the support motherboard is evaluated by the following method: obtaining preset dimension characteristic data of the support motherboard in multiple preset dimensions; the preset dimensions include material properties, design parameter properties and manufacturing process properties; the material properties include the tensile strength, temperature resistance range and corrosion resistance of the material used by the support motherboard; the design parameter properties include the stress distribution and durability test results of the support motherboard structure; the manufacturing process properties include the welding quality and material processing accuracy of the support motherboard; based on all the preset dimension characteristic data, analysis and processing are performed to obtain target integrated characteristic data; based on the target integrated characteristic data, similarity analysis is performed with first integrated characteristic data to obtain first similarity data; similarity analysis is performed with second integrated characteristic data to obtain second similarity data; target evaluation data is obtained based on the first similarity data and the second similarity data; the durability of the support motherboard is evaluated based on the target evaluation data; the first integrated characteristic data is used to reflect the performance characteristics of the support motherboard under optimal or standard working conditions; the second integrated characteristic data is used to reveal the performance characteristics of the support motherboard under non-optimal or fault conditions; The shell comprises a control panel; the control panel is provided with an external connector, a power switch, a self-checking switch and an operating state indicator; the external connector, the power switch, the self-checking switch and the operating state indicator are respectively connected with the support motherboard; wherein the support motherboard is provided with a third rectangular terminal; the number of the external connectors is multiple, and the external connectors are adapted to connect sensors for measuring water level; the external connectors are connected with the third rectangular terminal; the external connectors are circular connectors; the support motherboard is provided with a fourth rectangular terminal; the number of the operating state indicators is multiple, and the multiple operating state indicators are connected with the fourth rectangular terminal; The power switch, the power filter, the power loop, the control loop and the running state indicator lamp constitute a series system when the liquid level metering device is in a working state; wherein, the device failure rate of the liquid level metering device is summed up with the component failure rate of each component in the liquid level metering device, and the average failure interval time of the liquid level metering device is determined based on the reciprocal of the device failure rate.

2. The apparatus of claim 1, wherein, The support mother board has RS422 communication ports and CAN communication ports; The control circuit board is provided with RS422 communication circuits and CAN communication circuits; The RS422 communication circuits are connected with the RS422 communication ports, and the CAN communication circuits are connected with the CAN communication ports.

3. The apparatus of claim 2, wherein, The RS422 communication ports and the CAN communication ports correspond to a running state indicator lamp; wherein, the RS422 communication ports and the CAN communication ports are in a non-working state, and the running state indicator lamp is in an extinguished state or a flickering state.

4. The apparatus of claim 1, wherein, The control circuit board is provided with a signal isolation module and an analog-digital conversion module; the analog-digital conversion module is connected with the MCU chip in the control loop; The signal isolation module is configured to separate, distribute and convert the instrument signals collected by any sensor to obtain isolated signals; The analog-digital conversion module is configured to convert the isolated signals into digital outputs; wherein, the digital outputs are transmitted to the MCU chip, and the MCU chip is configured to control the lighting state of the running state indicator lamp corresponding to the any sensor based on the digital outputs.

5. The apparatus of claim 4, wherein, The instrument signals collected by any sensor correspond to a preset collection data range; In the case that the instrument signals are in the preset collection data range, the running state indicator lamp corresponding to the any sensor is extinguished; In the case that the instrument signals do not belong to the preset collection data range, the running state indicator lamp corresponding to the any sensor flickers.

6. The apparatus of claim 5, wherein, The MCU chip is in communication connection with an upper computer; in the case that the instrument signals are lower than the lower limit of the preset collection data range, the upper computer receives a broken line alarm signal sent by the MCU chip and displays; In the case that the instrument signals exceed the upper limit of the preset collection data range, the upper computer receives an out-of-range alarm signal sent by the MCU chip and displays.

7. The apparatus of claim 1, wherein, In the case that the power switch is in a conducting state, the self-checking switch is triggered, the first running state indicator lamp corresponding to the self-checking switch is lighted, the liquid level metering device enters a self-checking state, and the control circuit board runs a pre-burned self-checking program and sends a self-checking result to an upper computer, so that the upper computer judges whether the liquid level metering device works normally according to the self-checking result; In the self-checking process of the liquid level metering device, the second running state indicator lamp corresponding to the self-checking switch flickers.

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