Wireless remote transmission liquid level meter

Abstract

The invention discloses a wireless remote transmission liquid level meter which comprises a micro control unit MCU, a liquid level sensor interface, a GNSS positioning module, a switchable circuit module, an industrial field bus interface, a high-precision accelerometer sensor and a mobile cellular network communication module are integrated, and the micro control unit MCU is connected with the liquid level sensor interface through a liquid level signal processing circuit. The communication module communicates with the GNSS positioning module through a USART serial interface; the high-precision accelerometer sensor communicates with the MCU through an SPI (Serial Peripheral Interface), and the mobile cellular network communication module communicates with the MCU through a USART (Universal Synchronous Asynchronous Receiver Transmitter) serial interface. The system is provided with the power supply automatic switching circuit module, can automatically switch between an external power supply and an internal battery system power supply, can be compatible with an industrial field bus, carries out instant data interaction, and is simple, convenient and rapid to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid level measurement devices, and in particular to a wireless remote transmission liquid level gauge capable of automatically switching bus communication. Background Art

[0002] At present, there are basically two communication methods for liquid level transmitters on the market: one is to use an external power supply, and the transmitted signals are mostly transmitted in wired ways such as bus and analog signals. The disadvantage of this method is that it is necessary to connect cables, which is not convenient for frequently moving positions and is more cumbersome to use; the other is to use battery power supply and communicate through wireless network methods such as cellular network, LoRa, and Bluetooth. This method can avoid the above problems of wired communication. However, wireless communication has high power consumption, and under the condition of battery power supply, only a periodic communication strategy can be adopted to save battery power, which results in poor real-time performance of data and incompatibility with industrial field buses. In many application scenarios, it is necessary for the liquid level transmitter to have mobile communication functions, and at the same time, it is necessary to be able to access the industrial field bus at any time for instant data interaction, and the operation should be simple, convenient and fast. The existing liquid level transmitter products cannot meet the above requirements. Summary of the Invention

[0003] The purpose of the present invention is to provide a wireless remote transmission liquid level gauge, which solves the problems and defects in the background art, is equipped with a power supply automatic switching circuit module, can automatically switch between an external power supply and an internal battery system power supply, and is compatible with the industrial field bus for instant data interaction, with simple, convenient and fast operation.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A wireless remote transmission liquid level gauge includes a microcontroller unit MCU, which integrates a liquid level sensor interface, a GNSS positioning module, a switchable circuit module, an industrial field bus interface, a high-precision accelerometer sensor, and a mobile cellular network communication module. The microcontroller unit MCU is connected to the liquid level sensor interface through a liquid level signal processing circuit and communicates with the GNSS positioning module through a USART serial interface; the high-precision accelerometer sensor communicates with the microcontroller unit MCU through an SPI interface, and the mobile cellular network communication module communicates with the microcontroller unit MCU through a USART serial interface.

[0006] Further, the switchable circuit module is connected in parallel to two power supply systems. One is a standby battery power supply system, which is powered by a 3.6V energy storage battery; the other is an external power supply system, which can receive an external power input of 5 - 36V.

[0007] The wireless remote transmission liquid level gauge is equipped with an automatic power switching circuit. When there is an external power supply system, the external power supply system provides power for the liquid level gauge system. At the same time, the microcontroller unit (MCU) controls the MOS switch of the industrial bus interface, turns it on and conducts data interaction through the bus. When there is no external power supply, the above-mentioned standby battery supplies power to the system, and at the same time, the bus interface is closed, and the system enters the low-power operation mode.

[0008] The wireless remote transmission liquid level gauge integrates a GNSS positioning module, which communicates with the microcontroller unit (MCU) through the USART serial interface. It has two functions: one is to be able to track the position information of the liquid level gauge in real time, and the other is to provide accurate timing for the entire system.

[0009] The wireless remote transmission liquid level gauge integrates a high-precision accelerometer sensor, which has two functions: one is to calculate the attitude angle of the liquid tank through the triaxial acceleration values, so as to judge whether the tank is tilted; the other is that if the acceleration of a certain axis of the accelerometer exceeds the threshold value, an interrupt signal is sent to the microcontroller unit (MCU), so that it can be judged that movement has occurred.

[0010] The wireless remote transmission liquid level gauge integrates a mobile cellular network communication module, which communicates with the microcontroller unit (MCU) through the USART serial interface, and is used to upload the measured data to the wide area network through 3G / 4G signals.

[0011] The wireless remote transmission liquid level gauge integrates an industrial field bus interface, such as RS485, CAN, PROFIBUS, etc., and is used to upload the measured data to the main control system of the industrial field through the bus.

[0012] Furthermore, the cellular mobile network module and the GNSS positioning module are respectively connected to their respective antennas through N-type socket antenna extension cables, and the antennas can be installed in a location with good communication environment to achieve better communication effects.

[0013] Two N-type socket antennas are provided, which are respectively connected to the cellular mobile network module and the GNSS positioning module.

[0014] The microcontroller unit (MCU) serves as the control and operation core unit, is responsible for the task scheduling of the entire liquid level transmitter and is connected to various peripherals. The data collected by various sensors is received and processed by the microcontroller unit (MCU). At the same time, it monitors the high-precision accelerometer sensor to achieve attitude and collision monitoring.

[0015] The working process of the present invention is as follows;

[0016] First, power on and start the system for initialization, and perform data acquisition tasks through the microcontroller unit (MCU) in each cycle, including liquid level data, system power status, ambient temperature, attitude angle, collision information, etc.

[0017] GNSS positioning task: In each communication cycle, a GNSS positioning is performed through the GNSS positioning module to obtain the current position information. At the same time, the accurate world time is obtained and the local time is synchronized with it, which can ensure the accuracy of the system time.

[0018] LTE-4G communication task: In each communication cycle, a 4G communication is performed through the mobile cellular network communication module. The collected data information can be packaged and sent to the cloud platform through the 4G mobile network. At the same time, various parameters of the liquid level transmitter can be configured. Due to the fast communication speed of the 4G mobile network, the system software upgrade task can also be executed.

[0019] Bus communication task: When the system detects that there is an external power supply system for power supply, the bus interface is turned on and waits for the bus data request. When the requested data is received, the currently collected data information is immediately replied through the bus. When there is no external power supply system for power supply, the system is powered by the standby battery, and at the same time, the bus interface is turned off, and the system enters the low-power operation mode.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: It has the advantages of being convenient, flexible, and movable. At the same time, it is equipped with an automatic power supply switching circuit module, which can automatically switch between the external power supply and the internal battery system power supply, and can also take into account the function of connecting the liquid level gauge to the industrial field bus. And this process is automatically completed by the system without manual intervention, truly realizing plug and play, filling the gap in the industry, and having great application prospects. Brief Description of the Drawings

[0021] Figure 1 It is the system block diagram of the present invention.

[0022] Figure 2 It is the schematic diagram of the working process of the present invention. Detailed Embodiment

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figure 1 And Figure 2 , the present invention provides a technical solution:

[0025] A wireless remote transmission liquid level gauge, including a micro control unit MCU, integrated with a liquid level sensor interface, a GNSS positioning module, a switchable circuit module, an industrial field bus interface, a high-precision accelerometer sensor, and a mobile cellular network communication module. The micro control unit MCU is connected to the liquid level sensor interface through a liquid level signal processing circuit, and the liquid level sensor interface is connected to an external liquid level sensor for real-time measurement of liquid level information.

[0026] The micro control unit MCU communicates with the GNSS positioning module through a USART serial interface, which has two functions: one is to be able to track the position information of the liquid level gauge in real time, and the other is to provide precise timing for the entire system.

[0027] The micro control unit MCU communicates with the high-precision accelerometer sensor through an SPI interface. The high-precision accelerometer sensor has two functions: one is to calculate the attitude angle of the liquid tank through the triaxial acceleration values, so as to judge whether the tank is tilted; the other is that if the acceleration of a certain axis of the accelerometer exceeds the threshold, an interrupt signal is sent to the micro control unit MCU, so that it can be judged that movement has occurred.

[0028] The micro control unit MCU communicates with the mobile cellular network communication module through a USART serial interface, and is used to upload the measured data to the wide area network through 3G / 4G signals.

[0029] The wireless remote transmission liquid level gauge integrates an industrial field bus interface, such as RS485, CAN, PROFIBUS, etc., and is used to upload the measured data to the main control system of the industrial site through the bus.

[0030] The switchable circuit module is connected in parallel to two power supply systems. One is a standby battery power supply system, which is powered by a 3.6V energy storage battery; the other is an external power supply system, which can receive an external power input of 5 - 36V.

[0031] The wireless remote transmission liquid level gauge is equipped with a power automatic switching circuit. When there is power supply from the external power supply system, the external power supply system provides power for the liquid level gauge system. At the same time, the micro control unit MCU will control the MOS switch of the industrial bus interface, turn it on and perform data interaction through the bus. When there is no external power supply, the above-mentioned standby battery supplies power to the system, and at the same time, the bus interface is closed, and the system enters the low-power operation mode.

[0032] The micro control unit MCU serves as the control and operation core unit, responsible for the task scheduling of the entire liquid level transmitter and connecting with various peripherals. The data collected by various sensors is received and processed by the micro control unit MCU. At the same time, it monitors the high-precision accelerometer sensor to achieve attitude and collision monitoring.

[0033] The cellular mobile network module and the GNSS positioning module are respectively connected to their corresponding antennas through N-type socket antenna extension cables. The antennas can be installed in positions with good communication environments to achieve better communication effects.

[0034] The working process of the present invention is as follows:

[0035] First, power on and start the system for initialization. In each cycle, perform data acquisition tasks through the microcontroller unit (MCU), including liquid level data, system power status, ambient temperature, attitude angle, collision information, etc.

[0036] GNSS positioning task: Perform GNSS positioning once in each communication cycle through the GNSS positioning module to obtain the current position information, and at the same time obtain the accurate world time and synchronize the local time with it, so as to ensure the accuracy of the system time.

[0037] LTE-4G communication task: Perform 4G communication once in each communication cycle through the mobile cellular network communication module. The collected data information can be packaged and sent to the cloud platform through the 4G mobile network. At the same time, various parameters of the liquid level transmitter can be configured. Since the communication speed of the 4G mobile network is fast, the system software upgrade task can also be executed.

[0038] Bus communication task: When the system detects that there is an external power supply system for power supply, turn on the bus interface and wait for bus data requests. When the requested data is received, immediately reply with the currently collected data information through the bus. When there is no external power supply system for power supply, the system is powered by the standby battery, and at the same time the bus interface is closed, and the system enters the low-power operation mode.

[0039] The present invention has the advantages of being convenient, flexible, and movable. At the same time, it is equipped with a power automatic switching circuit module, which can automatically switch between external power and internal battery system power, and can also take into account the function of connecting the liquid level gauge to the industrial field bus. This process is automatically completed by the system without manual intervention, truly realizing plug-and-play, filling the gap in the industry, and having great application prospects.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wireless remote liquid level meter, characterized in that: It comprises a microcontroller unit MCU, which is integrated with a liquid level sensor interface, a GNSS positioning module, a switchable circuit module, an industrial field bus interface, a high-precision accelerometer sensor, and a mobile cellular network communication module. The microcontroller unit MCU is connected to the liquid level sensor interface through a liquid level signal processing circuit, and communicates with the GNSS positioning module through a USART serial interface; the high-precision accelerometer sensor communicates with the microcontroller unit MCU through an SPI interface, and the mobile cellular network communication module communicates with the microcontroller unit MCU through a USART serial interface.

2. A wireless remote liquid level meter according to claim 1, characterized in that: The switchable circuit module is connected in parallel with two power supply systems, one is a standby battery power supply system powered by a 3.6V energy storage battery; the other is an external power supply system that can receive a 5-36V external power input.

3. The wireless remote liquid level meter according to claim 1, characterized in that: The microcontroller unit MCU serves as a control and computing core unit, is responsible for the task scheduling of the entire liquid level transmitter and is connected with various peripherals. The data collected by various sensors and functional modules are received and processed by the microcontroller unit MCU.

4. A wireless remote liquid level meter according to claim 1, characterized in that: The GNSS positioning module and the mobile cellular network communication module are respectively connected to corresponding antennas through N-type socket antenna extension lines.

5. The wireless remote liquid level meter according to claim 1, characterized in that: The industrial field bus interface includes RS485, CAN, and PROFIBUS, which are used to upload the measured data to the main control system of the industrial site through the bus.

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