Plant factory multipath temperature and humidity coupling intelligent environment control system based on Internet technology

Abstract

The invention discloses a plant factory multipath temperature and humidity coupling intelligent environment control system based on an internet technology, and relates to the technical field of plant factory environment precise control. Comprising a lower computer PLC measurement and control system, an upper computer Lab VIEW data processing center and a Siemens Plant Simulation digital twinning system, air temperature and humidity data, soil temperature and humidity data and plant leaf surface temperature and humidity data are collected through sensors, multi-channel information is coupled and calculated through a PID algorithm to form an environment control intelligent decision, precise environment control is achieved, a socket data exchange protocol is used, and the environment control system is connected with the upper computer PLC measurement and control system and the lower computer Lab VIEW data processing center and the Siemens Plant Simulation digital twinning system. A plant factory real-time monitoring system is constructed by taking digital twinning as a mapping platform. After a series of design experiments verify, the measurement and control system can adjust various temperature and humidity indexes in the plant factory to a certain extent, and design requirements are met. According to the invention, the Internet technology, the sensor technology and the digital twinborn technology are integrated, and a method is provided for more intelligently, efficiently and accurately realizing plant factory measurement and control.

Description

Technical Field

[0001] The present invention belongs to the technical field of precise environmental control of plant factories, and more specifically, relates to a multi-channel temperature and humidity coupling intelligent environmental control system for plant factories based on Internet technology. Background Art

[0002] Under the background of the current integrated development of primary and secondary industries and the revitalization of agriculture through science and technology, promoting the digitization of facility cultivation has become one of the important measures to improve the application level of smart agriculture. As a modern agricultural industrial system with refined management, a plant factory monitors variable information such as temperature, humidity, light, CO 2 concentration, and nutrient solution in the plant growth environment, combines plant phenotype information, and automatically adjusts environmental conditions to the optimal growth environment of crops, thereby improving crop yield and quality. The development of computer technology and information technology has made the development and application of plant factories possible. In particular, the integrated application of sensor technology, Internet technology, and information technology can realize data collection, transmission, and analysis and decision-making, and automatically control the environmental control equipment, irrigation equipment, and lighting equipment of plant factories, thereby improving production efficiency and management level and reducing labor costs. Although certain achievements have been made in the development of plant factories, their related technologies still need to be continuously improved. In particular, the optimization of precise environmental control methods still needs to be further improved. Precise environmental control is one of the key technologies of plant factories, which is directly related to the growth of crops. How to further optimize the environmental control algorithm to achieve more precise regulation and improve crop quality and yield is the problem that needs to be solved currently. The continuous progress of technology provides new opportunities for the intelligentization of plant factories, promising to solve some of the current problems and promoting the development of plant factories towards a more efficient and intelligent direction. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a multi-channel temperature and humidity coupling intelligent environmental control system for plant factories based on Internet technology, which can perform real-time environmental monitoring on plant factories and achieve precise environmental adjustment and control according to the monitoring results, thereby improving crop quality and yield.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is: A multi-channel temperature and humidity coupling intelligent environmental control system for plant factories based on Internet technology, comprising:

[0005] A lower computer PLC measurement and control system, which collects, compensates, processes, and records a total of six-way temperature and humidity data of the environment and plants, and at the same time receives the command signal of the upper computer to control the execution device;

[0006] The upper computer Lab VIEW data processing center monitors and displays the temperature and humidity data of the environment and plants in real time, couples and calculates the six-way temperature and humidity data, obtains the control signals for the execution devices such as fans, humidifiers, and water pumps, and sends the control signals to the lower computer PLC measurement and control system;

[0007] Siemens Plant Simulation digital twin system, the six-way temperature and humidity data of the environment and plants are mapped into the Siemens Plant Simulation digital twin system, and the Siemens Plant Simulation digital twin system monitors the environmental variable data, plant phenotype information, and the operating status of the execution devices in the plant factory in real time.

[0008] Preferably, the lower computer PLC measurement and control system includes an environmental data acquisition terminal, a plant phenotype acquisition terminal, and an execution device control terminal.

[0009] Preferably, the environmental data collected by the environmental data acquisition terminal includes four-way temperature and humidity data of air temperature and humidity and soil temperature and humidity, the data collected by the plant phenotype acquisition terminal are two-way temperature and humidity data of plant leaves, and the execution device control terminal receives and executes the intelligent decision-making issued by the upper computer Lab VIEW data processing center for the fans, humidifiers, and water pumps in the plant factory.

[0010] Preferably, the hardware of the lower computer PLC measurement and control system mainly includes PLC, PLC signal board, optoelectronic isolator, RS485 air temperature and humidity transmitter, RS485 soil temperature and humidity moisture sensor, industrial-grade temperature sensor, HR202L humidity sensor, power supply, fan, humidifier, water pump;

[0011] The acquisition of environmental data includes four variables of air temperature and humidity and soil temperature and humidity. The 485-type sensor is used to connect the optoelectronic isolator, the optoelectronic isolator is connected to the serial server, and the serial server is connected to the PLC through the network cable for acquisition. Among them, the RS485 soil temperature and humidity moisture sensor and the RS485 air temperature and humidity transmitter detect the soil temperature and humidity and air temperature and humidity, and the PLC collects, compensates, processes, and records these data;

[0012] The plant phenotype data acquires two variables of plant leaf temperature and humidity, detects the leaf surface temperature and humidity variables through the temperature and humidity sensor, and transmits them to the lower computer PLC in the form of analog signals;

[0013] The data communication between the PLC and Lab VIEW is based on the configuration of the Scout software to realize the data interaction between the upper computer Lab VIEW and the lower computer PLC.

[0014] Preferably, the host computer Lab VIEW data processing center includes a PID algorithm intelligent decision-making program, a remote control program, and a data monitoring program developed based on Lab VIEW.

[0015] Preferably, the Lab VIEW application program is run on the PC side. Using the PID control algorithm, the coupling calculation is performed on the six-way temperature and humidity variable information to obtain the ideal voltage for controlling the fans, humidifiers, and water pumps in the plant factory, forming an intelligent decision.

[0016] The Lab VIEW data processing center sends the control signals of the fans, humidifiers, and water pumps to the PLC through Scout communication to adjust the voltages of the three actuating devices, thereby controlling the environmental conditions in the plant factory.

[0017] The data monitoring program displays the air temperature and humidity, leaf temperature and humidity, and environmental temperature and humidity in real time, with an accuracy of one decimal place, so as to accurately display the six-way temperature and humidity variable parameter situation in the plant factory for data monitoring.

[0018] Preferably, the Siemens Plant Simulation digital twin system includes digital roaming, equipment operation monitoring, environmental variable monitoring, and physiological state monitoring.

[0019] Preferably, the data communication from Lab VIEW to the digital twin system is based on the Socket data exchange protocol, where LabVIEW implements the Socket server and Plant Simulation implements the Socket client; the TCP of Socket completes the processing of the request in Plant Simulation and the response in Lab VIEW through TCP communication, and the communication protocol can ensure the integrity of the sent and received data, mapping the six-way data from Lab VIEW to the digital twin system.

[0020] The Siemens Plant Simulation digital twin system is equipped with a 3D model of the plant factory, which intuitively reflects the situation inside the plant factory. The monitoring platform displays the data of the air temperature and humidity, soil temperature and humidity, and leaf temperature and humidity inside the plant factory. The data transmission platform can receive the data mapping from Lab VIEW and synchronize the data inside the plant factory to the digital twin; digital roaming can observe the plant factory model and the corresponding data information from the first perspective in the constructed 3D plant factory precise environmental control model, and real-time monitor the environmental variable data, plant phenotype information, and the operating status of the actuating devices inside the plant factory.

[0021] The beneficial effects of adopting the above technical solutions are as follows:

[0022] 1. This system can control the environment of the plant factory more intelligently and accurately. It performs operations on the input data and uses different coupling calculation methods when the data is at different thresholds. When the measured value is within a certain threshold, the calculation method within this threshold is used to adjust the controller. The three temperature variables and three humidity variables are coupled and calculated respectively, and the calculation results are used for intelligent decision-making to achieve the purpose of accurate adjustment.

[0023] 2. The advantages of the present invention are that it supports digital twin, based on the TCP-based Socket data exchange protocol, and realizes communication between the upper computer and the digital twin system, achieving data exchange between sensors, controllers, servers and the digital twin system. Digital twin can enable digital simulation and real-time data synchronization, and more intuitively observe the environmental parameters and plant conditions in the plant factory through the digital twin system. Brief Description of the Drawings

[0024] Figure 1 is a schematic diagram of the system of the present invention;

[0025] Figure 2 is a schematic diagram of the plant phenotype acquisition terminal;

[0026] Figure 3 is a schematic diagram of the humidifier, fan, and water pump controller circuit;

[0027] Figure 4 is a schematic diagram of the upper computer control panel developed based on Lab VIEW;

[0028] Figure 5 is a Scout operation flowchart;

[0029] Figure 6 is a Socket exchange protocol flowchart;

[0030] Figure 7 is a schematic diagram of the upper computer data query panel developed based on Lab VIEW;

[0031] Figure 8 is a schematic diagram of the digital twin platform. Detailed Embodiments

[0032] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0033] Such as Figure 1As shown in the figure, the present invention consists of a lower computer PLC measurement and control system, an upper computer Lab VIEW data processing center, and a digital twin system. The PLC measurement and control system includes an environmental data acquisition terminal, a plant phenotype acquisition terminal, and an execution device control terminal. The Lab VIEW data processing center includes a PID algorithm intelligent decision-making program, a remote control program, and a data monitoring program developed based on Lab VIEW. The digital twin system is developed based on Plant Simulation and includes digital roaming, equipment operation monitoring, environmental variable monitoring, and physiological state monitoring. The present invention also includes two communication modules, Scout communication and Socket communication. Scout communication is used for data interaction between the PLC measurement and control system and the Lab VIEW data interaction center. Socket communication is used for data mapping between the Lab VIEW data interaction center and the digital twin system.

[0034] As Figure 2 shown, the plant phenotype acquisition terminal of the present invention mainly includes an industrial-grade temperature sensor and an HR202L humidity sensor. These two sensors are pasted on the surface of the plant leaves to measure the physiological information on the surface of the plant leaves. The industrial-grade temperature sensor is connected to the PLC analog thermocouple detection channel, and the PLC reads the temperature information. The humidity sensor is connected in series with a 137 kΩ fixed-value resistor and connected to a 24-volt regulated DC power supply. The change in humidity affects the resistance value of the humidity sensor, and thus affects the voltage value across the sensor. The two ends of the humidity sensor are connected in parallel to the PLC analog voltage detection channel, and the humidity is measured by measuring the voltage.

[0035] As Figure 3 shown, it is a schematic circuit diagram of the humidifier, fan, and water pump controller. In this system, the execution device control system receives the control decision signal sent by the upper computer based on the PLC. For the control of the humidifier / atomizer and the fan, the PLC converts the decision signal into a 0-5V voltage and outputs it as an analog quantity. The 0-5V voltage signal is linearly converted into a 0-24V voltage through a voltage linear amplification module to achieve the control of the humidifier / atomizer and the fan. For the control of the water pump, the PLC converts the decision signal into a 0 / 24V voltage and outputs it as a digital quantity to achieve the control of the water pump.

[0036] Figure 4Shown is the upper computer control panel developed based on Lab VIEW. Lab VIEW is a graphical programming and development environment used for the writing and development of computer software. Its main functions include data reading, data analysis, data operation, etc. At the same time, Lab VIEW opens multiple data interaction channels, facilitating data transmission with other software through protocols. This invention realizes the data interaction between the upper computer Lab View and the lower computer PLC, the data transmission from the upper computer Lab View to the digital twin system, Lab View data processing, and PID algorithm weight processing. In the data interaction center of this system Lab View, LabVIEW programming is used to achieve the switching between automatic control and manual control, and the hot switching between automatic control and manual control. During the automatic control process, the voltage value of the controller is the output value determined by the PID algorithm, realizing the automatic environmental regulation of the plant factory in the unmanned state. When the manual control button is turned on to switch to manual control, the switch and voltage value of the controller can be manually set by pulling the slider. The hot switching makes up for the deficiency of the Lab VIEW upper computer algorithm decision in extreme cases and optimizes the control strategy.

[0037] As Figure 5 Shown, the data transmission between the upper computer Lab VIEW and the lower computer PLC of this invention applies Scout software. Scout can provide multiple data interaction channels, monitor variables and synchronize data. When Lab VIEW modifies the monitored variable, Scout simultaneously modifies this variable in the PLC; when the PLC modifies the data of this variable, Scout simultaneously modifies the data in Lab VIEW, thus realizing two-way data interaction. When the communication program runs, Scout first initializes and establishes a connection between the PLC and Lab VIEW. Subsequently, it reads Lab VIEW commands, which are divided into 3 modes: read, write, read-write, and others. If the command is read, the data in the PLC is uploaded to Lab VIEW. If the command is write, the Lab VIEW data is transmitted to the PLC. If the command is read-write, the data in Lab VIEW and the PLC is monitored, and the data is updated synchronously during the process.

[0038] As Figure 6As shown in the figure, the present invention has developed a data exchange protocol based on TCP and JSON for information interaction between Lab VIEW and Plant Simulation. JSON data packets are used to encapsulate data requests and responses, and the TCP communication protocol can ensure the integrity of data sending and receiving. Therefore, sensor data, controller data, action requests, etc. are encapsulated in the form of JSON data, transmitted through the TCP protocol, and the server performs corresponding operations or returns data according to the request type. In this system, the server side is Lab VIEW, which is responsible for establishing a TCP service and listening for requests from the client; the client is Plant Simulation, which requests or uploads data to the server through operations or at regular intervals.

[0039] Figure 7 It is the historical data query panel of the host computer. Operators can easily query the historical data of 6 variables in the plant factory through the host computer, which helps operators analyze data, predict trends, etc.

[0040] Figure 8 It is the digital twin platform. Operators can remotely and intuitively observe the environmental parameters and plant conditions in the plant factory through the digital twin system. During the data collection process of the digital twin system, it receives the data uploaded by Lab VIEW in real time and splits and processes the received data. When Lab VIEW sends data to the digital twin system, PlantSimulation receives the signal and displays the corresponding variables such as air temperature, air humidity, soil temperature, soil humidity, leaf surface temperature, leaf surface humidity, etc. on the digital twin system, preparing for subsequent data management, mapping, etc. operations. At the same time, an environmental roaming path is programmed in the digital twin system to complete the roaming operation.

[0041] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A multi-channel temperature and humidity coupling intelligent environmental control system for plant factories based on Internet technology, characterized in that: include: The lower computer PLC measurement and control system collects, compensates, processes and records a total of six channels of temperature and humidity data for the environment and plants, and receives command signals from the upper computer to control the execution equipment; The upper computer Lab VIEW data processing center monitors and displays the temperature and humidity data of the environment and plants in real time, and couples and calculates the six-channel temperature and humidity data to obtain control signals for the execution devices such as fans, humidifiers, and water pumps, and sends the control signals to the lower computer PLC measurement and control system; Siemens Plant Simulation digital twin system, six channels of temperature and humidity data of the environment and plants are mapped to the Siemens Plant Simulation digital twin system. The Siemens Plant Simulation digital twin system monitors the environmental variable data, plant phenotypic information and the operating status of the execution equipment in the plant factory in real time.

2. According to the Internet-based plant factory multi-channel temperature and humidity coupling intelligent environmental control system according to claim 1, it is characterized in that: The lower computer PLC measurement and control system includes an environmental data acquisition terminal, a plant phenotype acquisition terminal, and an execution device control terminal.

3. According to claim 2, a plant factory multi-channel temperature and humidity coupling intelligent environmental control system based on Internet technology is characterized in that: The environmental data collected by the environmental data acquisition end include four-channel temperature and humidity data of air temperature and humidity, soil temperature and humidity, the data collected by the plant phenotype acquisition end are two-channel temperature and humidity data of plant leaves, and the execution device control end receives and executes the intelligent decisions made by the host computer Lab VIEW data processing center on the fans, humidifiers and water pumps in the plant factory.

4. According to claim 3, a plant factory multi-channel temperature and humidity coupling intelligent environmental control system based on Internet technology is characterized in that: The hardware of the lower computer PLC measurement and control system mainly includes PLC, PLC signal board, photoelectric isolator, RS485 air temperature and humidity transmitter, RS485 soil temperature and humidity moisture sensor, industrial temperature sensor, HR202L humidity sensor, power supply, fan, humidifier, water pump; Environmental data collection includes four variables: air temperature and humidity, soil temperature and humidity. A 485 sensor is used to connect to a photoelectric isolator, which is then connected to a serial port server. The serial port server is connected to a PLC via a network cable for data collection. The RS485 soil temperature and humidity moisture sensor and the RS485 air temperature and humidity transmitter detect soil temperature and humidity and air temperature and humidity. The PLC collects, compensates, processes and records these data. Plant phenotypic data collects two variables of plant leaf temperature and humidity. The leaf temperature and humidity variables are detected by temperature and humidity sensors and transmitted to the lower computer PLC in the form of analog signals; The data communication between PLC and Lab VIEW is based on the configuration of Scout software, which realizes the data interaction between the upper computer Lab VIEW and the lower computer PLC.

5. According to the Internet-based plant factory multi-channel temperature and humidity coupling intelligent environmental control system of claim 1, it is characterized in that: The host computer Lab VIEW data processing center includes a PID algorithm intelligent decision-making program, a remote control program and a data monitoring program developed based on Lab VIEW.

6. According to claim 5, a plant factory multi-channel temperature and humidity coupling intelligent environmental control system based on Internet technology is characterized in that: The Lab VIEW application is run on the PC, and the PID control algorithm is used to couple and calculate the six-channel temperature and humidity variable information, and the ideal voltage for controlling the fan, humidifier, and water pump in the plant factory is obtained to form an intelligent decision. The Lab VIEW data processing center sends the control signals of the fan, humidifier, and water pump to the PLC via Scout communication, adjusts the voltage of the three actuators, and thus controls the environmental conditions in the plant factory; The data monitoring program displays the air temperature and humidity, leaf temperature and humidity, and ambient temperature and humidity in real time with an accuracy of one decimal place, so as to accurately display the six temperature and humidity variable parameters in the plant factory for data monitoring.

7. According to the Internet-based plant factory multi-channel temperature and humidity coupling intelligent environmental control system of claim 1, it is characterized in that: The Siemens Plant Simulation digital twin system includes digital roaming, equipment operation monitoring, environmental variable monitoring and physiological status monitoring.

8. According to claim 7, a plant factory multi-channel temperature and humidity coupling intelligent environmental control system based on Internet technology is characterized in that: The data communication from Lab VIEW to the digital twin system is based on the Socket data exchange protocol, where LabVIEW implements the Socket server and Plant Simulation implements the Socket client. The TCP of the Socket completes the processing of data requests in Plant Simulation and responses in Lab VIEW through TCP communication. The communication protocol can ensure the integrity of the sent and received data and map the six channels of data from Lab VIEW to the digital twin system. The Siemens Plant Simulation digital twin system is equipped with a 3D model of a plant factory, which intuitively reflects the situation inside the plant factory. The monitoring platform displays the air temperature and humidity, soil temperature and humidity, and leaf temperature and humidity in the plant factory. The data transmission platform can receive data mapping from Lab VIEW and synchronize the data in the plant factory to the digital twin. Digital roaming can observe the plant factory model and corresponding data information from a first-person perspective in the constructed 3D plant factory precise environmental control model, and monitor the environmental variable data, plant phenotypic information, and the operating status of the execution equipment in the plant factory in real time.

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