A comprehensive energy-saving control method for IoT centralized monitoring system of refrigeration equipment

Abstract

The present invention discloses a comprehensive energy-saving control method for an IoT centralized monitoring system of refrigeration equipment. The method is based on refrigeration equipment and is executed on the IoT centralized monitoring system. The IoT centralized monitoring system comprises refrigeration equipment, a terminal controller, a LoRa wireless communication module, an industrial IoT gateway and a cloud monitoring platform. The terminal controller transmits the collected refrigeration equipment data to the industrial IoT gateway through the LoRa wireless communication module. The industrial IoT gateway processes and stores the transmitted data and sends the data information to the cloud monitoring platform. The comprehensive energy-saving algorithm analyzes and compares the collected data information with set related parameters. When the control conditions of the comprehensive energy-saving algorithm are met, the energy-saving control function is triggered, thereby realizing energy-saving control of refrigeration equipment in supermarkets and convenience stores, and achieving the purpose of energy saving and emission reduction.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigeration equipment monitoring, and in particular relates to a comprehensive energy-saving algorithm for an IoT centralized monitoring system of refrigeration equipment based on supermarkets and convenience stores. Background Art

[0002] The current supermarket refrigeration equipment is too scattered and large in size, which makes it difficult for supermarket managers to grasp the parameter data of supermarket refrigeration equipment and the status information of refrigerators; the current supermarket refrigeration equipment is not intelligent enough, and usually requires someone to be on duty or survey, and cannot be intelligently and automatically adjusted and controlled according to the real-time status of the current refrigeration equipment; due to the relative independence of existing refrigeration equipment, the operating conditions of each device are different, and the different characteristics cannot be effectively displayed, and valuable operating data parameters are lost; currently, most refrigerator controls are managed by a single individual, and group control and analysis cannot be achieved, resulting in data parameter loss, management obstruction, and high power consumption. Even if some supermarkets and convenience stores currently have management systems, they are not configured with IOT system architecture, and the various functional systems are not perfect enough, and even remote office, historical query, data analysis, remote control and other functions cannot be realized. There is also a lack of comprehensive energy-saving algorithms based on the operating conditions, on-site characteristics, and manual configuration of refrigeration equipment. Summary of the invention

[0003] In order to overcome the defects that the existing on-site refrigerator products or controllers in supermarkets and convenience stores are too dispersed and difficult to control, the present invention provides a comprehensive energy-saving control method for a refrigeration equipment IoT centralized monitoring system, which is more convenient for overall control of the environment of on-site refrigeration equipment in supermarkets and convenience stores and the activity status inside the refrigeration equipment, thereby realizing energy-saving control of refrigeration equipment in supermarkets and convenience stores.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a comprehensive energy-saving control method for a refrigeration equipment IoT centralized monitoring system, which is based on refrigeration equipment and is executed on the IoT centralized monitoring system. The IoT centralized monitoring system includes refrigeration equipment, a terminal controller, a LoRa wireless communication module, an industrial Internet of Things gateway and a cloud monitoring platform; the terminal controller transmits the refrigeration equipment data collected by it to the industrial Internet of Things gateway through the LoRa wireless communication module, the industrial Internet of Things gateway processes and stores the transmitted data, and sends the data information to the cloud monitoring platform; the comprehensive energy-saving algorithm analyzes and compares the collected data information with the set relevant parameters, and triggers the energy-saving control function when the control conditions of the comprehensive energy-saving algorithm are met.

[0005] As a further implementation scheme of the present invention, the comprehensive energy-saving algorithm includes an air suction floating algorithm and an anti-condensation control algorithm. The air suction floating algorithm is included in the terminal controller application, and the anti-condensation control algorithm is included in the industrial Internet of Things gateway application.

[0006] As a further implementation scheme of the present invention, the suction floating algorithm includes the following steps: setting the refrigerant, suction pressure setting value, deviation value, suction pressure rise change, suction pressure drop change, suction pressure rise ratio, suction pressure drop ratio, suction group refrigeration equipment temperature upper limit, suction group refrigeration equipment temperature lower limit, suction pressure floating enable setting value in the terminal controller; setting the refrigeration equipment suction group, the terminal controller determines whether to adjust the suction pressure according to the actual value of the refrigeration equipment temperature in the suction group, only determines the temperature of the refrigeration equipment in the refrigeration state, takes the average temperature of the refrigeration equipment in the refrigeration cycle, and determines whether the suction temperature can be increased or decreased according to the average temperature. After the adjustment starts, it determines whether it needs to be ended according to the real-time temperature of the refrigeration equipment.

[0007] As a further embodiment of the present invention, the suction pressure adjustment method includes: determining the intermediate temperature of the refrigeration equipment, which is: (the upper temperature limit of the suction group refrigeration equipment + the lower temperature limit of the suction group refrigeration equipment) / 2, taking the temperature of the refrigeration equipment every 1-30s, and 1-30s can be set:

[0008] ① When the temperature of 60-90% of the refrigeration equipment in the suction group is ≤ the middle temperature, 60%-90% of which are settable values, the suction pressure of the refrigeration equipment is increased and adjusted every 1-30s. 1-30s can be set until the temperature of the refrigeration equipment reaches (upper temperature limit -1)℃, and the pressure increase stops;

[0009] ② When the temperature of 25%-40% of the refrigeration equipment in the suction group is ≥ the upper temperature limit, the suction pressure of the refrigeration equipment is adjusted downward, of which 25%-40% is an adjustable set value, which is adjusted every 1-30s, and 1-30s can be set until the temperature of 8%-30% of the refrigeration equipment is lower than the upper temperature limit, and the pressure reduction stops;

[0010] ③ For refrigeration equipment after defrosting, it is necessary to wait for 15 minutes before starting to compare the temperature of the refrigeration equipment with the intermediate temperature when re-starting refrigeration;

[0011] ④ When the temperature of 45%-70% of the refrigeration equipment in the suction group is ≥ the middle temperature, the suction pressure will not be adjusted, of which 45%-70% is the adjustable set value;

[0012] The above suction pressure adjustment is made between the suction pressure set value and the upper limit value of the suction pressure fluctuation. The upper limit value of the suction pressure fluctuation is the sum of the suction pressure set value and the deviation value.

[0013] As a further implementation of the present invention, the anti-condensation control algorithm includes the following steps: Set the minimum value of the anti-condensation heater, the maximum value of the anti-condensation heater, the percentage of the total power when the anti-condensation heater is at the minimum value, the anti-condensation control operation cycle, and the anti-dew enable in the industrial Internet of Things gateway or platform; Set the anti-condensation group. Obtain the on-site temperature and humidity from the on-site temperature and humidity sensors, calculate the dew point value, control the heating wire to heat according to the dew point value, and when the heating time of the heating wire reaches the calculated set value, the heating wire stops heating.

[0014] As a further implementation of the present invention, the control of the heating wire according to the dew point value specifically is: Calculate the output duty cycle,

[0015] Output duty cycle = C + (100 – C) * (dew point value – A) / (B – A);

[0016] If the dew point value < A, the heating wire is turned off;

[0017] If the dew point value > B, the heating wire is turned on;

[0018] Calculate the heating time,

[0019] Heating time = output duty cycle * D, rounded to two decimal places by default and finally rounded to one decimal place;

[0020] Calculate the stop time,

[0021] Stop time = (1 - output duty cycle) * D, rounded to two decimal places by default and finally rounded to one decimal place;

[0022] Among them, the meanings represented by A, B, C, and D are as follows:

[0023] A is the dew point value (in degrees Celsius) when the anti-condensation heater is at the minimum value;

[0024] B is the dew point value (in degrees Celsius) when the anti-condensation heater is at the maximum value;

[0025] C is the percentage of the total power when the anti-condensation heater is at the minimum value (%);

[0026] D is the anti-condensation control operation cycle, that is, the sum of the on and off times (min).

[0027] The beneficial effects of the present invention include: the comprehensive energy-saving algorithm is based on and centered on the IoT centralized monitoring system, analyzes and compares the collected data information with the set relevant parameters, and triggers the energy-saving control function when the control conditions of the comprehensive energy-saving algorithm are met, thereby realizing energy-saving control of refrigeration equipment in supermarkets and convenience stores, and achieving the purpose of energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the overall architecture diagram of the IoT centralized monitoring system of the present invention;

[0029] Figure 2 This is a physical framework diagram of the IoT centralized monitoring system of the present invention;

[0030] Figure 3 It is a logical architecture diagram of the air-inhalation floating algorithm of the present invention;

[0031] Figure 4 It is a schematic diagram of the vertical refrigerator of the present invention;

[0032] Figure 5 This is a control flow chart of the step-by-step electronic expansion valve of the present invention;

[0033] Figure 6 This is a control flow chart of a PWM electronic expansion valve according to the present invention;

[0034] Figure 7 This is a functional architecture diagram of the data collection part of the industrial Internet of Things of the present invention;

[0035] Figure 8 This is the overall framework diagram of the joint energy algorithm of the industrial Internet of Things of the present invention;

[0036] Fig. 9 It is a logical architecture diagram of the anti-condensation control algorithm of the present invention;

[0037] Fig.10 This is a functional architecture diagram of the docking part of the industrial Internet of Things gateway platform of the present invention;

[0038] Fig.11 It is a schematic diagram of the overall layout of the refrigerator controller of the present invention;

[0039] Fig.12 It is a diagram showing the main components of the refrigerator controller of the present invention;

[0040] Fig.13 is a diagram illustrating ports of a refrigerator controller of the present invention;

[0041] Fig.14 This is a wiring diagram of a refrigerator controller of the present invention;

[0042] Fig.15 It is a logo diagram of the main components of the cold storage controller of the present invention.

[0043] Explanation of the reference numerals in the figure: 1. Refrigeration equipment, 2. Terminal controller, 3. LoRa wireless communication module, 4. Industrial Internet of Things gateway, 5. Industrial Internet platform, 6. Configuration touch screen, 7. MCU micro control unit, 8. Analog input unit, 9. Analog output unit, 10. Digital input unit, 11. Digital output unit, 12. Electronic expansion valve output unit, 13. Dimming output unit, 14. RS485 communication bus interface a, 15. RS485 communication bus interface b, 16. External AC220V voltage input terminal, 17. Transformer, 18. System power supply.

[0044] 19. Operational amplifier, 20. Analog IC, 21. Debug interface, 22. Microcontroller, 23. Lithium battery, 24. Buzzer, 25. Electrolytic capacitor, 26. Inductor, 27. Power IC, 28. Rectifier bridge, 29. Transient suppression diode, 30. Glass discharge tube, 31. Varistor, 32. Optocoupler, 33. Thyristor, 34. Safety capacitor, 35. Relay, 36. Communication interface board plug-in, 37. Communication interface chip, 38. Fuse, 39. Pressure input a, 40. Temperature input a, 41. Dimming output, 42. Transformer secondary end, 43. Fan output, 44. Transformer primary end, 45. Power input, 46. AKV electronic expansion valve, 47. Alarm output, 48. Cabinet external lighting / cabinet internal lighting, 49. Defrost synchronization, 50. Heating output / cooling output, 51. Non-cold output, 52. Standby relay output, 53. Remote Switch, 54, communication signal, 55, DC12V solid-state relay, 56, monitoring computer, 57, spare 485 communication, 58, display, 59, host computer / cascade / RS485 communication interface a, 60, electronic expansion valve, 61, analog output, 62, MCU chip, 63, 220V power supply, 64, electric fuse, 65, JTAG burning port, 66, phase sequence detection part, 67, host computer / cascade / RS485 communication interface b, 68, inverter RS485 communication interface, 69, analog input, 70, switch input, 71, antenna connector, 72, IOT extension board socket, 73, temperature input b, 74, pressure input b, 75, progressive electronic expansion valve, 76, digital tube, 77, key switch, 78, LED indicator light, 79, 7A RC discharge, 80, relay output, 81, SSR relay output. DETAILED DESCRIPTION

[0045] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used to distinguish components, and cannot be understood as indicating or implying relative importance.

[0047] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] Example 1

[0049] This embodiment first provides an IoT centralized monitoring system for refrigeration equipment in supermarkets and convenience stores based on LoRa wireless communication technology. The entire architecture consists of three parts, including a refrigeration equipment 1 with the concept of "end", and a terminal controller 2 connected to the refrigeration equipment 1, the terminal controller 2 is used for acquisition control; a LoRa wireless communication module 3 and an industrial Internet of Things gateway 4 with the concept of "edge", the LoRa wireless communication module 3 is connected between the terminal controller 2 and the industrial Internet of Things gateway 4; an industrial Internet platform 5 with the concept of "cloud", the industrial Internet platform 5 is connected to the industrial Internet of Things gateway 4 for communication. The industrial Internet of Things gateway 4 also supports communication connection and display with the configuration touch screen 6. The three parts cooperate with each other to provide control and services for the comprehensive energy-saving algorithm.

[0050] In the above implementation scheme, the terminal controller 2 collects the data of the refrigeration equipment 1 of the supermarket convenience store, and connects with the industrial Internet of Things gateway 4 through the LoRa wireless communication module 3. The industrial Internet of Things gateway 4 processes and stores the transmitted data, and transfers the local data to the configuration touch screen 6 connected to one side of the industrial Internet of Things gateway 4, and sends the data information to the industrial Internet platform 5. According to the collected data information, the comprehensive energy-saving algorithm will analyze and compare with the set relevant parameters. When the control conditions of the comprehensive energy-saving algorithm are met, the energy-saving control function will be triggered, thereby realizing the energy-saving control of the refrigeration equipment of the supermarket convenience store and achieving the purpose of energy saving and emission reduction.

[0051] like Figure 1As shown in the figure, the IoT centralized monitoring system for refrigeration equipment includes the terminal device layer, the edge control layer and the cloud platform layer. The refrigeration equipment 1 in the supermarket convenience store is the source of all data. All subsequent control, query, management, maintenance and other operations are also based on the operating data and real-time status provided by the refrigeration equipment 1. Therefore, the refrigeration equipment 1 in the supermarket convenience store is the bottom layer in the concept of "end". The upper layer in the concept of "end" is the terminal controller 2, which is also an important link between the "end" and the "edge". In this system architecture, the terminal controller 2 is mainly responsible for data collection and bottom-level control. It collects the data provided by the refrigeration equipment 1 in the supermarket convenience store, and cooperates with each other according to the internal control logic and the control instructions issued by the upper layer to perform the corresponding control functions. An energy-saving algorithm program is embedded in the terminal controller 2, which is mainly used for algorithm control and processing of the end and executes the functional requirements of the end part.

[0052] like Figure 2 As shown, the terminal controller 2 includes a refrigerator controller and a cold storage controller. The refrigerator controller is connected to the refrigerator in the refrigeration device 1 correspondingly, and the cold storage controller is connected to the cold storage in the refrigeration device 1 correspondingly.

[0053] The overall layout and connection relationship of the refrigerator controller are as follows Fig.11 As shown, it includes an MCU micro control unit 7, and an analog input unit 8, a digital input unit 10, an analog output unit 9, a digital output unit 11, an electronic expansion valve output unit 12, a dimming output unit 13, an RS485 communication bus interface a14, an RS485 communication bus interface b15, a switching power supply and a system power supply 18 respectively connected to the MCU micro control unit 7;

[0054] The switching power supply includes an external AC220V voltage input terminal 16 and a transformer 17 connected to each other. The input voltage AC220V is converted into AC24V by the external linear power transformer 17 to supply power to the refrigerator controller circuit board;

[0055] System power supply 18: AC24V AC voltage is input to the circuit board and connected to 2 DC-DC switching power supply chips after full-bridge rectification and filtering. The DC-DC switching power supply chips output DC12V and DC5V voltages respectively. The DC12V voltage powers the relay, analog output, and analog input parts. The DC5V voltage powers the interface chip, PNP transistor emitter, pull-up resistor, display interface and other parts. The DC5V voltage generates a DC3.3V voltage through the forward low-dropout regulator AMS1117-3.3V to supply the MCU microcontroller unit 7, RS485 communication and other parts;

[0056] Analog input unit 8: The analog input unit 8 uses the internal 12-bit ADC of the MCU microcontroller unit 7 to collect input signals; it includes 6-channel temperature analog input parts that can detect the temperature input of the temperature sensor PT1000 (2-wire) / thermistor temperature sensor NTC5K, and 1-channel voltage DC 0-10V input, which can collect pressure sensor signals;

[0057] Analog output unit 9: The analog output unit 9 adopts the internal 12-bit DAC or pulse width modulation (PWM) of the MCU microcontroller unit 7, and selects the output mode by switching the 0Ω resistor on the circuit board; it includes 1 analog output channel, which can output 0-10V signal or 4-20mA signal, and the output type is selected by software setting, and the current or voltage output is selected through the wiring terminal;

[0058] The digital input unit 10 includes: 3 AC220V switch input channels, which use photoelectric couplers to isolate strong and weak currents and then connect the signals to the MCU microcontroller unit 7; 2 dry node input channels, the input interface is connected to a 470R pull-up resistor to a DC5V voltage after the interference is eliminated by a magnetic bead and then passed through a single-phase conduction diode;

[0059] Electronic expansion valve output unit 12: includes voltage pulse type electronic expansion valve and PWM type electronic expansion valve. The voltage pulse type electronic expansion valve is controlled by the MCU micro control unit 7, and the output signal is sent to the output interface after passing through the ULN2003 driver chip and capacitor decoupling. The PWM type electronic expansion valve is driven by the MCU micro control unit 7 to output the PWM control signal to drive the optocoupler to control the bidirectional thyristor to output the AC control signal;

[0060] MCU microcontroller unit 7, adopts STM32 processor STM32F103VCT6 of STMicroelectronics (ST) as main control chip, configures real-time clock module adopts dedicated chip model PCF8563 to complete time operation and maintenance, communicates with STM32F103VCT6 using IIC (I2C) bus, and configures external memory EEPROM, 24C32 is used to record and store data;

[0061] The digital output unit 11 includes: 8 independent relay output channels and 2 relay output channels sharing a common terminal. Among the 10 relay outputs, 9 are single-pole single-throw type and 1 is single-pole double-throw type; 4 transistor outputs can drive electronic expansion valves (excitation drive type), and 1 transistor output can drive akv (220VAC) electronic expansion valves;

[0062] Dimming output unit 13: uses Darlington transistor output, and cooperates with electronic ballast to adjust the light brightness;

[0063] 2-way RS485 communication bus interface, due to its strong anti-interference ability, can be used for long-distance data transmission. The two interfaces can be used to connect to the host computer and the human-machine interface (HMI) respectively. The other two interfaces have red and green LEDs to indicate the system communication status, which is convenient for finding the cause when a communication failure occurs.

[0064] like Fig.12 As shown, the main components of the refrigerator controller include: operational amplifier 19, analog IC 20, debugging interface 21, microcontroller 22 (MCU), lithium battery 23, buzzer 24, electrolytic capacitor 25, inductor 26, power IC 27, rectifier bridge 28, transient suppression diode 29 (TWS), glass discharge tube 30, varistor 31, optical coupler 32, thyristor 33, safety capacitor 34, relay 35, communication interface board plug-in 36, communication interface chip 37, fuse 38; Fig.13 As shown, the freezer controller port components include: pressure input a39, temperature input a40, dimming output 41, transformer secondary end 42, fan output 43, transformer primary end 44, power input 45, AKV electronic expansion valve 46, alarm output 47, cabinet external lighting / cabinet internal lighting 48, defrost synchronization 49, heating output / cooling output 50, non-cooling output 51, spare relay output 52, remote switch 53, communication signal 54, DC12V solid-state relay 55, monitoring computer 56, spare 485 communication 57, display 58, host computer / cascade / RS485 communication interface a59, electronic expansion valve 60, analog output 61;

[0065] The freezer controller application is stored in the STM32F103VCT6 main control chip. When the freezer controller is working, it needs a 220V power supply. The host computer can read the parameter setting value and collection value of the register address in the freezer controller through the RS485 communication bus interface, and judge whether the setting parameters are correct, etc. At the same time, the RS485 communication bus interface also has a cascade mode, which can realize the simultaneous connection of multiple units. The freezer controller can collect temperature parameters, pressure parameters, fan start and stop, electronic expansion valve start and stop and other parameters, and control the connected refrigeration equipment to achieve energy saving. There is also a spare 485 communication port in the freezer controller to ensure the communication function of the freezer controller.

[0066] It should be noted that the refrigerator controller of the above structure is mainly used for the control of display refrigerators. As the best choice of this embodiment, it is compatible with the thermal expansion valve controller in terms of volume and wiring terminals, etc., while ensuring sufficient control points, and effectively controls the cost of the product. Compared with various functions, it has reached the more advanced level in the industry in terms of structure appearance, input and output points and performance indicators, communication interface performance, ease of use, etc. However, the refrigerator controller of this structure is not the only choice of this embodiment, and other known models of controllers with acquisition control functions can be selected as the choice of this embodiment.

[0067] The cold storage controller includes an MCU integrated on an acquisition board and a digital signal input circuit, a digital signal output circuit, an analog input circuit, an analog output circuit, and a communication circuit respectively connected to the MCU; and also includes a power supply, which is connected to the MCU, the digital signal input circuit, the digital signal output circuit, the analog input circuit, the analog output circuit, and the communication circuit to provide power for them.

[0068] Power supply: The switching power supply uses the TOP242-GN switching power supply chip to realize the conversion of the power supply part from AC 220V to DC 12V. The DC12V power supply is used to power the relay, ULN2003, stepping electronic expansion valve, pressure sensor, analog output op amp, LM2575 switching voltage regulator integrated circuit, and 485 communication port peripherals where CN9 is located; the conversion from 12V to 5V is realized by LM2575, and the 5V voltage output is used to power the AMS1117 regulator, pressure sensor, reserved 4G module, 485 communication port and AD8628AIDBZR precision op amp; the conversion from 5V to 3.3V is realized by AMS1117, and 3.3V is used to power the MCU chip, 485 chip, some pull-ups, REF3025 reference voltage source, etc.

[0069] MCU: GD32F103VET6 from GigaDevice is used, the programming method is SWD, 0.1uF chip decoupling capacitor, power-off clock retention, U7 EEPROM, three buttons KEY1 KEY2 KEY3, shift register combined with 3-digit digital tube;

[0070] Digital signal input circuit: Pull up the MCU chip pins through resistors R57-R64 to stabilize the pin state, and change the MCU chip pin state when the peripheral is grounded (controller ground);

[0071] The digital signal output circuit uses a 7-input and 7-output ULN2003 chip to drive 8 relays. The relay contacts are matched with the resistance-capacitance absorption between the neutral line and the live line. When the relay is turned on, the corresponding light-emitting diode will light up. There are also 3 T410-600B bidirectional thyristor outputs, which are controlled by the MOC3062 isolation driver.

[0072] Analog input circuit: It is divided into two parts. One part is the temperature NTC5K sensor type. The resistors R73-R80 are used to realize the 8-way temperature voltage divider circuit. The MCU judges the corresponding temperature value through the voltage. The other part is the circuit used for the pressure sensor. The sensor is divided into voltage type and current type. The middle pin of the cold storage controller acquisition board socket CN1-CN3 is used as the analog signal input, which will eventually be given to the MCU chip in the form of voltage for voltage judgment.

[0073] Analog output circuit: The DA pin of the MCU gives a signal, and the LM358 op amp is used to realize 4-20mA and 0-10V. It also includes the control of two step-type electronic expansion valves, which are driven by the ULN2003 chip, and another PWM signal output;

[0074] The communication circuit uses the SP3485EN-L / TR chip with position numbers U19-U21, and also reserves a 4G module plug-in interface for IOT.

[0075] like Fig.15 As shown, the main components of the cold storage controller include: MCU chip 62, 220V power supply 63, electric fuse 64, JTAG burning port 65, phase sequence detection part 66, host computer / cascade / RS485 communication interface b67, inverter RS485 communication interface 68, analog input 69, switch input 70, antenna connector 71, IOT expansion board socket 72, temperature input b73, pressure input b74, progressive electronic expansion valve 75, digital tube 76, key switch 77, LED indicator light 78, 7A RC discharge 79, relay output 80, SSR relay output 81.

[0076] The cold storage controller application is stored in the MCU chip. When the cold storage controller is working, a 220V power supply is required. The electrical fuse next to the power supply is to ensure that the cold storage controller is powered on to prevent the danger of abnormal voltage causing the cold storage controller to burn out. The program is burned into the MCU chip through the JTAG burning port. The power consumption and power statistics of the refrigeration equipment connected to the cold storage controller can be recorded through phase sequence detection, providing data basis and energy-saving effect judgment for energy-saving algorithm control. The host computer can read the parameter setting value and collection value of each address of the register in the cold storage controller through the RS485 communication interface, and judge whether the setting parameters are correct. At the same time, the RS485 communication interface also has a cascade mode, which can realize the simultaneous connection of multiple units. The inverter RS485 communication interface is mainly used to connect the inverter, so that this cold storage controller has a frequency conversion function, which is the basic preparation for realizing energy-saving control. The cold storage controller controls the connected refrigeration equipment by collecting temperature parameters, pressure parameters, fan start and stop, compressor and other parameters, thereby achieving the purpose of energy saving. The IOT extension socket can be connected to the 4G module when the cold storage controller needs to be independently connected to the Internet. There are three buttons on the switch, namely the confirmation button, the up button - increase button, and the down button - decrease button. The three buttons can control the digital tube display, indicator light flashing, parameter setting and other functions.

[0077] It should be noted that the cold storage controller with the above structure is mainly used for the control of cold storage and is the best choice for this embodiment. However, the cold storage controller with this structure is not the only choice for this embodiment. Other known models of controllers with acquisition control functions can be selected for this embodiment.

[0078] The concept of "edge" in this system architecture is mainly divided into LoRa wireless communication module 3 and industrial Internet of Things gateway 4, which is the core of the algorithm in this comprehensive energy-saving algorithm. The E95-DTU (400LS22-485) LoRa wireless communication module 3 used in this architecture is a wireless data transmission radio with military-grade modulation technology. It is also compatible with multiple transmission modes and works in the (470MHz~493MHz) frequency band (default 470MHz). The LoRa wireless communication module 3 of this embodiment provides a transparent RS485 interface, a plastic shell, a guide rail installation structure, and a variety of different voltage inputs. LoRa spread spectrum technology will bring a longer communication distance and has the advantage of strong anti-interference ability. As a communication medium, LoRa wireless communication module 3 has a certain scope of application, just like optical fiber, microwave and open wire: it provides real-time and reliable data transmission of monitoring signals in private networks under certain special conditions. It has the characteristics of low cost, easy installation and maintenance, strong diffraction ability, flexible networking structure and long coverage. It is suitable for occasions with many points and scattered locations and complex geographical environments. Because it can be connected to data terminals such as PLC, RTU, rain gauge and liquid level meter, the connection to the terminal controller is more stable and reliable.

[0079] In summary, the LoRa wireless communication part of this architecture uses the E95-DTU (400LS22-485) LoRa wireless communication module 3. The national LoRa frequency band is 470-510MHz, and 470-493MHz is our optional communication frequency band, which can meet the communication needs on site. The LoRa wireless communication part is mainly to solve the problems of data transmission difficulties of multi-terminal controllers on site. Generally, the refrigerator products or controllers on site of supermarkets and convenience stores may be too scattered, difficult to control, and inconvenient to use wired connections. Therefore, the use of reliable wireless network data transmission has become the main problem that needs to be solved in this architecture. After repeated technical discussions, the E95-DTU (400LS22-485) LoRa wireless communication module 3 was finally adopted because the module uses the latest LoRa technology, so it has a longer distance and more powerful performance than the traditional LoRa data transmission radio; it has data encryption function, and the packet length can be set by engineers or other technicians; it supports LBT function, and the radio automatically waits for sending according to the current environmental noise intensity, which greatly improves the communication success rate of the radio in harsh environments.

[0080] Industrial Internet of Things Gateway 4 is the upper layer of the "edge" and the important core of the "edge". At the same time, as the core of data acquisition and control, Industrial Internet of Things Gateway 4 also undertakes the functions of data forwarding and data storage.

[0081] Industrial Internet of Things Gateway 4 is mainly divided into two different types of gateways corresponding to supermarkets and convenience stores. The main difference between them lies in the number of connected devices at the port and the appearance style. Their roles in the architecture system are the same, and their functions and roles such as energy-saving algorithm control are also the same.

[0082] A preferred model of Industrial IoT Gateway 4: FCU1104 Industrial IoT Gateway, key component description: FCU1104 Industrial IoT Gateway is developed and designed with NXP i.MX6ULL processor, which has the advantages of ultra-high efficiency, high performance, low cost, etc., with a main frequency of up to 792M Hz, and supports 256MB / 256MB industrial-grade core board and 512MB / 4GB extended commercial-grade core board. FCU1104 Industrial IoT Gateway has two configurations by default: basic version and extended version. The basic version integrates Ethernet, 4G, WiFi, LoRa, RS485 and other functional interfaces, and the extended version can also expand RS485, RS232, CAN, DI / DO interfaces; 4G, WiFi, LoRa and other functions adopt modular design, and customer function configuration is more flexible.

[0083] Another preferred model of the IIoT Gateway 4: the BinGo-Box Mini IIoT Gateway.

[0084] The main difference between the above two versions of the gateway is the number of external ports. The BinGo-Box Mini Industrial IoT gateway has two 485 communication channels, and the FCU1104 Industrial IoT gateway has four 485 communication channels.

[0085] Example 2

[0086] A comprehensive energy-saving control method for the IoT centralized monitoring system of refrigeration equipment provides managers and users of large supermarkets and small convenience stores with real data of refrigeration equipment in supermarkets, while effectively integrating the concepts and functions of the Internet of Things. Combined with the built-in comprehensive energy-saving algorithm, it reduces the management costs of supermarkets and the energy consumption of refrigeration equipment. Therefore, the development of this algorithm fills the gap in the comprehensive energy-saving algorithm for refrigeration systems and monitoring systems in supermarkets and convenience stores, and has important social value and historical significance.

[0087] The comprehensive energy-saving algorithm based on the IoT centralized monitoring system for refrigeration equipment in supermarkets and convenience stores is based on the IoT centralized monitoring system and the core, and based on the refrigeration equipment in supermarkets and convenience stores. The core architecture of the IoT centralized monitoring system is cloud, edge, and end. The three work together to serve as both service providers and executors of the comprehensive energy-saving algorithm.

[0088] The main energy-saving algorithm program in this comprehensive energy-saving algorithm consists of two parts, namely the anti-condensation control algorithm and the suction floating algorithm. The two algorithms are integrated and coordinated with the IoT centralized monitoring system, making the comprehensive energy-saving algorithm and this architecture interdependent, greatly playing the role of the energy-saving algorithm.

[0089] This embodiment is described by taking a refrigerator as the refrigeration equipment.

[0090] The application of the suction floating algorithm in the comprehensive energy-saving algorithm is included in the terminal controller application. The set values ​​of the suction floating algorithm include refrigerant, suction pressure set value, deviation value, suction pressure increase change, suction pressure decrease change, suction pressure increase ratio, suction pressure decrease ratio, suction group refrigerator temperature upper limit, suction group refrigerator temperature lower limit, and suction pressure floating enable.

[0091] The judgment logic and adjustment basis of the suction floating algorithm are:

[0092] The terminal controller determines whether the suction pressure should rise based on the cabinet temperature of the on-site refrigerator as an important criterion for adjusting the suction pressure. First, it is necessary to set the refrigerator suction grouping, and determine whether the suction pressure can be increased based on the actual value of the refrigerator temperature in the suction group related to the unit. Only the cabinet temperature of the refrigerator in the refrigeration state is determined. The temperature inside the cabinet takes the average temperature of the refrigeration cycle (the solenoid valve is turned on and off as one cycle), and determines whether the suction temperature can be adjusted up or down based on the average temperature. After the adjustment starts, it is determined whether it needs to be ended based on the real-time temperature inside the refrigerator.

[0093] The default setting rules for the important parameters of the suction floating algorithm are as follows:

[0094] ①Refrigeration medium

[0095] ②Set value: Unit: bar

[0096] ③ Deviation value: The original set value plus the deviation value is the upper limit of the suction pressure floating. When the suction pressure floating function is enabled, the set value of the suction pressure floats between the original set value and the upper limit of the suction pressure floating. The default value (2k difference corresponds to the pressure value) can be set

[0097] ④Intake pressure rise variation: The adjustment value for each increase in intake pressure, the default value is 0.005 bar. (Adjustable)

[0098] ⑤ Change in suction pressure drop: The suction pressure decreases by an adjustment value each time, the default value is 0.005 bar. (Adjustable)

[0099] ⑥ Intake pressure rise ratio: The actual value of the intake pressure rise adjustment = the amount of rise X the rise ratio, the default setting is 2

[0100] ⑦Suction pressure drop ratio: Suction pressure drop adjustment actual value = drop change amount x drop ratio, default 3 can be set

[0101] ⑧ Upper temperature limit of suction group refrigerator (default 7℃ adjustable)

[0102] ⑨ Lower temperature limit of suction group refrigerator (default 3℃ adjustable)

[0103] ⑩Suction pressure floating enable

[0104] The control design scheme of the refrigerator group in the terminal controller takes the average temperature as a control parameter of the floating suction pressure. Therefore, the upper temperature limit (default 7℃ and adjustable temperature) and lower temperature limit (default 3℃ adjustable) of the suction group refrigerator need to be set on the terminal controller. According to the upper and lower limits of the refrigerator group, the middle temperature of the refrigerator is determined as (upper limit + lower limit) / 2. The refrigerator temperature is taken every 1-30s, and 1-30s can be set. Therefore, the control rules in the refrigerator cooling state are as follows:

[0105] ① When the temperature of 60-90% of the refrigerators in the group is ≤ the middle temperature (60%-90% is a settable value), the suction pressure of the refrigerator will be increased, and there will be data information prompts (background records), and it will be adjusted every 1-30 seconds. Until the temperature inside the refrigerator reaches (temperature upper limit -1)℃, the pressure increase will stop.

[0106] ② When the temperature of 25%-40% of the refrigerators in the group is ≥ the upper temperature limit, the suction pressure of the refrigerator will be adjusted down, of which 25%-40% is an adjustable set value, which is adjusted every 1-30s and can be set in 1-30s. The pressure reduction will stop when the temperature of 8%-30% of the refrigerators is lower than the upper temperature limit;

[0107] ③ For a freezer that has been defrosted, it is necessary to wait for 15 minutes before starting to compare the freezer temperature with the middle temperature when starting to refrigerate again.

[0108] ④ When the temperatures of 45%-70% of the refrigerators in the group are ≥ the middle temperature, the suction pressure will not be adjusted, of which 45%-70% are adjustable set values.

[0109] The above suction pressure adjustments are all made between the original suction pressure setting value and the upper limit of the suction floating value.

[0110] like Figure 4 The vertical freezer shown in the figure introduces the refrigeration related parameters:

[0111] Parameter A01: Weighted temperature ratio setting value, used to calculate weighted temperature, requires both the outlet and return air sensors to be present, formula: Sv = (Sm*(100-A01)+Sr*A01) / 100,

[0112] Among them, Sm represents the return air temperature, Sr represents the outlet air temperature, and Sv is the calculated weighted temperature.

[0113] If the return air temperature sensor fails, Sv=Sr; if the outlet air temperature sensor fails, Sv=Sm.

[0114] For example, A01=50, Sv=(Sm+Sr) / 2.

[0115] The terminal controller supports many timing functions, such as timed defrosting, timed non-cooling, timed DSB dimming, timed lighting, timed night mode, timed anti-condensation function, and timed dual-speed fan energy-saving mode. Each timing function has at least 4 time periods. Each time period has two parameters, such as Ft09 and Ft10 for timed non-cooling time period 1, and Ft11 and Ft12 for timed non-cooling time period 2.

[0116] The time period setting follows the following setting rules:

[0117] (1) The end time is greater than the start time, such as Ft10 is greater than Ft09, and the time period is enabled;

[0118] (2) If the end time is smaller than the start time or one of the times is set to "24:00", the time period is disabled.

[0119] Refrigeration control of electronic expansion valve by terminal controller:

[0120] 1. Stepping electronic expansion valve

[0121] like Figure 5 As shown,

[0122] (1) When initially powered on, first close the step-type electronic expansion valve to ensure that when the opening of the electronic expansion valve is 0, the corresponding number of steps is 0;

[0123] (2) When starting refrigeration, first open the electronic expansion valve to the initial position (initial opening) and maintain the delay. After the delay is over, the opening of the electronic expansion valve is automatically adjusted;

[0124] (3) Step (2) is performed every time refrigeration is required or refrigeration is required after defrosting.

[0125] (4) When cooling is not required, close the electronic expansion valve and the solenoid valve / compressor at the same time.

[0126] 2. PWM electronic expansion valve

[0127] like Figure 6 As shown,

[0128] (1) When starting cooling, first open the electronic expansion valve to the initial position (initial opening) and maintain the delay. After the delay is over, PI automatically adjusts the opening of the electronic expansion valve;

[0129] (2) Step (1) is performed every time refrigeration is required or refrigeration is required after defrosting.

[0130] (3) When cooling is not required, close the electronic expansion valve and the solenoid valve / compressor at the same time.

[0131] The concept of "edge" in the comprehensive energy-saving algorithm is mainly divided into LoRa wireless communication module 3 and industrial Internet of Things gateway 4, which is the core of the algorithm in this comprehensive energy-saving algorithm. The wireless communication part of the E95-DTU LoRa module carries the transmission function after the local data collection of the comprehensive energy-saving algorithm. Therefore, the use of LoRa wireless communication module 3 provides strong technical support for the suction floating algorithm of the terminal controller, realizes the local transmission of data information and parameters of the energy-saving algorithm in the terminal controller, and the wireless communication method improves the work efficiency on site. The industrial Internet of Things gateway is the carrier of the energy-saving algorithm, and is also the "middle platform" for data encryption, data analysis, data storage, and data forwarding in the comprehensive energy-saving algorithm. The industrial Internet of Things gateway will collect the relevant parameters and operating conditions on the terminal controller side, and then perform data analysis, data conversion, local storage and other operations to provide data information for subsequent connection to the cloud platform control.

[0132] The application built into the Industrial Internet of Things Gateway 4 mainly consists of three parts, namely the data acquisition part, the energy-saving algorithm part and the platform docking part. The data acquisition part mainly collects data from the refrigeration equipment 1 connected to the terminal controller 2, and performs data cleaning, data conversion, data storage and data encryption on the collected data. The energy-saving algorithm part is mainly based on the data acquisition part. Through data and logic control, the processing results are fed back to the refrigeration equipment 1 connected to the terminal controller 2, and the processing results are sent to the platform docking part. The platform docking part mainly acts as the upper-level connection control of the program. When interacting with the data acquisition part, data communication is mainly carried out through the OPC UA protocol.

[0133] The data acquisition part plays the role of an intermediate platform in the architecture. It is connected to the terminal controller 2 at the lower end, and communicates with other programs and external connection devices such as the configuration touch screen 6. The data acquisition part is also compatible with Modbus RTU protocol, Modbus TCP protocol and OPC UA protocol. The support of multiple protocols effectively ensures that the data acquisition part is not affected by each other while communicating with various links and modules. The data acquisition part is also equipped with network management functions, which can support ordinary SIM cards, that is, support PCIE interface Quectel EC200S (Cat.1, without GPS and voice functions), and the network standards of the 4G module include China Mobile 4G / 3G / 2G, China Unicom 4G / 3G / 2G and China Telecom 4G, and can read real-time signal values ​​according to the network conditions on site. The multi-channel parallel function of the data acquisition part can process data information on multiple links at the same time, greatly improving the collection efficiency and effectively reducing investment costs.

[0134] The energy-saving algorithm part mainly takes the real equipment provided by the data acquisition part as the basic data, and then takes the relevant parameters and logical judgments set in advance in the program as the basis, such as the condensation degree, suction pressure, exhaust pressure, door status, light status and other data set in the program. By comparing the numerical information of the set parameters and the status of the relevant parameters, the program in the energy-saving algorithm part is used for logical control, and the processing results are fed back to the refrigeration equipment 1 connected to the terminal controller 2, thereby reducing the energy consumption of the refrigeration equipment 1 connected to the terminal controller side. The results of the relevant logical control will also be fed back to the platform docking part, so the data information and result records have historical basis and can be queried, providing a real and reliable basis and preparation for future improvements and adjustments. Therefore, from a structural point of view, the energy-saving algorithm part plays a connecting role between the data acquisition part and the platform docking part, and also takes into account the logical control function, becoming the control of the power consumption reduction part. While reducing power consumption, it not only makes a great contribution to the energy conservation and emission reduction of refrigeration equipment, but also provides convenience for supermarket managers, greatly improves work efficiency, reduces the investment in personnel management, and promotes the healthy development of supermarkets.

[0135] The logical architecture of the energy-saving algorithm program in the industrial Internet of Things is shown in Figure 8.

[0136] For example, when the evaporator temperature parameter status judgment result corresponding to the freezer is higher than the set value, the system needs to perform cooling treatment, that is, the refrigeration cycle needs to be sucked into the air-cooled condenser by the compressor to reduce the temperature of the condenser. After cooling, the liquid refrigerant will flow into the liquid storage tank. When the real-time parameters in the industrial Internet of Things are compared with the default values ​​to reach the opening and closing set values ​​of the freezing solenoid valve and the refrigeration solenoid valve, the opening and closing of the freezing solenoid valve and the refrigeration solenoid valve can be controlled by feedback control, thereby reducing the energy consumption caused by the long-term operation of the freezing evaporator and the refrigeration evaporator. At the same time, the refrigerant pressure parameter in the industrial Internet of Things can detect the pressure value in the freezing evaporator and the pressure value in the refrigeration evaporator. This pressure value is the pressure value generated by the two gas-liquid mixed refrigerants with different pressures formed after the freezing expansion valve and the refrigeration expansion valve throttle and reduce the pressure. Under normal circumstances, the pressure value in the freezing evaporator is low, and the pressure value in the refrigeration evaporator is high. The low pressure value at the outlet of the freezing evaporator can be controlled by the terminal controller to increase the pressure of the auxiliary pressure device to the pressure in the refrigeration evaporator, so that the pressure of the gaseous refrigerant flowing through the freezing and refrigeration evaporator and entering the gas separator is almost the same. At this time, the controller will control the freezer to let the gaseous refrigerant return to the compressor to realize the refrigeration cycle of the system. By controlling the amount of refrigerant gas, the proportion of refrigerant mixing, the refrigeration time and other comprehensive parameters, the IoT centralized monitoring of refrigeration equipment in supermarkets and convenience stores can be realized and cooperated with the comprehensive energy-saving algorithm to achieve the purpose of energy saving and emission reduction.

[0137] The anti-condensation control algorithm is included in the energy-saving algorithm program of the industrial Internet of Things joints. The relevant parameters set are: the minimum value of the anti-condensation heater, the maximum value of the anti-condensation heater, the percentage of the total power when the anti-condensation heater is at the minimum value, the anti-condensation control operation cycle, that is, the on-off time, and the anti-condensation enable.

[0138] The control principle of the anti-condensation control algorithm is mainly composed of the following formula:

[0139] Output duty cycle = C + (100 – C) * (dew point value – A) / (B – A).

[0140] If the dew point value < A, the heating wire SSR is turned off;

[0141] If the dew point value > B, the heating wire SSR is turned on.

[0142] Heating time = output duty cycle * D, default rounding to two decimal places and finally retaining one decimal place;

[0143] Stop time = (1 - output duty cycle) * D, default rounding to two decimal places and finally retaining one decimal place;

[0144] For example: dew point value = 9, C = 30, B = 17, A = 8, D = 10 min, then the duty cycle = 30 + (100 - 30) * (9 - 8) / (17 - 8) = 37

[0145] Then the heating time is 37% * 10 min = 3.7 min, default rounding to two decimal places; the stop time is 63% * 10 min = 6.3 min, default rounding to two decimal places.

[0146] The meanings represented by A, B, C, and D are as follows:

[0147] ① The default value of the dew point value A when the anti-condensation heater is at the minimum value is 8 (degrees Celsius)

[0148] ② The default value of the dew point value B when the anti-condensation heater is at the maximum value is 30 (degrees Celsius)

[0149] ③ The default value of the percentage C of the total power when the anti-condensation heater is at the minimum value is 20 (%)

[0150] ④ The default value of D, the anti-condensation control operation cycle, that is, the sum of the on-off times, is 240 (min)

[0151] The minimum and maximum values ​​of the anti-condensation heater are mainly used to define the operating temperature range of the heating wire, and provide a reference for calculating the output duty cycle. The percentage of the total power when the anti-condensation heater is at the minimum value is mainly used to provide the heating time benchmark and the stop time benchmark for the heating wire. The time obtained by the calculation formula needs to be rounded to two decimal places, and finally retain one decimal place. The working steps of the anti-condensation control algorithm are described as follows:

[0152] 1. According to the anti-condensation group setting,

[0153] 2. Obtain the on-site temperature and humidity based on the on-site temperature and humidity sensor and calculate the dew point temperature.

[0154] 3. The heating of the heating wire is controlled according to the dew point value. When the heating time of the heating wire reaches the calculated set value, the heating wire stops heating.

[0155] The platform docking part mainly acts as the upper-layer connection control of the program. When interacting with the data acquisition part, data communication is mainly carried out through the OPC UA protocol. The platform docking part mainly acts as the OPC UA client in the communication. The platform docking part requests the stored data from the data acquisition part and forwards the data to the industrial Internet platform 5. Therefore, the platform docking part is a dedicated interface function between the industrial Internet platform 5 and the IoT centralized monitoring system of supermarket refrigeration equipment. The platform docking part is compatible with the OPC UA protocol internally, mainly used for requesting data; it is compatible with the MQTT protocol externally, mainly used for forwarding data to the upper-layer industrial Internet platform 5.

[0156] The main functions of the platform docking program are composed of the following four parts: timing mechanism function, data request function, result processing function and forwarding to the platform function. Each operation of the data request function, result processing function and forwarding to the platform function integrates an independent or default timing mechanism to ensure that data can be uploaded at a scheduled time, triggered and uploaded upon change, making the timestamp more specific and increasing the reliability of data information. In this way, the controllable transmission method effectively complies with the changes in the data collection mode and improves the timeliness of the data.

[0157] The cloud platform monitoring part of the "cloud" concept in this system architecture refers to the Industrial Internet Platform 5, which is mainly used for upper-level application control and data display. Managers and users of supermarkets and convenience stores can log in through mobile clients and computer clients. The computer client is assigned a fixed IP address. After the manager accesses it, he can log in to his own exclusive account, view the operating conditions of the equipment under the account, and perform corresponding configuration and management according to the needs of the site. At the same time, the cloud platform opens the energy-saving algorithm control setting, which can manually turn on and off the energy-saving algorithm function on site, so as to realize the power consumption comparison of turning on the energy-saving algorithm and turning off the energy-saving algorithm, making the energy-saving effect clear at a glance.

[0158] In summary, the comprehensive energy-saving algorithm of this embodiment has the following beneficial effects:

[0159] 1. The cloud, edge, and end architecture in the comprehensive energy-saving algorithm based on the IoT centralized monitoring system for refrigeration equipment in supermarkets and convenience stores makes the processing and monitoring capabilities of this energy-saving algorithm stronger;

[0160] 2. The IoT centralized monitoring of this comprehensive energy-saving algorithm solves the problem that the refrigeration equipment in supermarkets and convenience stores is too dispersed and large in size, making it difficult to manage;

[0161] 3. The IoT centralized monitoring system in this comprehensive energy-saving algorithm optimizes the deficiencies in the intelligent management of refrigeration equipment in supermarkets and convenience stores, effectively reducing the time and cost investment of manual duty or energy consumption survey;

[0162] 4. This comprehensive energy-saving algorithm solves the problem that the current refrigeration equipment in supermarkets and convenience stores cannot perform comprehensive energy-saving control according to the independent characteristics and real-time status of the current refrigeration equipment, thereby achieving the purpose of reducing power consumption and reducing cost investment;

[0163] 5. This comprehensive energy-saving algorithm effectively utilizes various parameters of supermarkets and convenience stores, transforming the independent supervision of refrigeration equipment into group control and analysis. In addition to effectively reducing equipment energy consumption, it also greatly increases the value of refrigeration equipment;

[0164] 6. The processing results and energy-saving effects of this comprehensive energy-saving algorithm can be queried and controlled through remote management, historical retrieval, data analysis, remote management and other functions.

[0165] The core of the comprehensive energy-saving algorithm architecture based on the IoT centralized monitoring system for refrigeration equipment in supermarkets and convenience stores is cloud, edge, and end. The three complement each other and jointly provide services, supervision, and control for the comprehensive energy-saving algorithm. This comprehensive energy-saving algorithm is integrated into the three, relying on each other and interacting with each other.

[0166] The "end" includes the refrigeration equipment end in supermarkets and convenience stores and the terminal controllers of the connected equipment. The data of the refrigeration equipment in the "end" is the source of all subsequent processes. All control, query, management, maintenance and other operations are also based on the operating data and real-time status provided by the refrigeration equipment. The terminal controller in the "end" is an important link between the "end" and the "edge", and is responsible for data collection and underlying control functions. The terminal controller collects the data provided by the refrigeration equipment in supermarkets and convenience stores, and cooperates with each other according to the internal control logic and the control instructions issued by the upper layer to execute the local energy-saving algorithm function of the controller, mainly collecting the floating suction pressure, floating exhaust pressure, anti-condensation and other parameters inside the unit.

[0167] The "edge" is mainly composed of the LoRa wireless communication part and the industrial Internet of Things gateway part. The LoRa wireless communication module can meet various communication needs, and at the same time solve the problems of multiple terminal controllers on site being too scattered, difficult to control, inconvenient to use wired connections and difficult data transmission. The industrial Internet of Things gateway is the core of the "edge", that is, the "brain" of the edge control end. At the same time, as the core of data acquisition and control, the industrial Internet of Things gateway also undertakes the functions of data forwarding and data storage. The data acquisition part, energy-saving algorithm part and platform docking part of the industrial Internet of Things gateway cooperate with each other, playing an important role in connecting the upper and lower parts of the architecture. The energy-saving algorithm program is the control core and processing core of this architecture. It docks with the program of the platform docking part at the top and the program of the data acquisition part at the bottom. It is the "brain" in the industrial Internet of Things gateway program.

[0168] The "cloud" concept in the architecture refers to the cloud platform monitoring part, which is mainly used for upper-level application control and data display. Managers can remotely view and browse the real-time information, historical data, equipment status, etc. of refrigeration equipment, and can also remotely control the refrigeration equipment on site. Since the cloud platform can manually turn on and off the energy-saving algorithm function on site, the "cloud" side can realize the power consumption comparison of turning on and off the energy-saving algorithm, making the energy-saving effect clear at a glance, greatly reducing the personnel investment cost and management process of supermarkets and convenience stores.

[0169] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A comprehensive energy-saving control method for a refrigeration equipment IoT centralized monitoring system, characterized in that: Based on refrigeration equipment, it is executed on the IoT centralized monitoring system, which includes refrigeration equipment, terminal controller, LoRa wireless communication module, industrial IoT gateway and cloud monitoring platform; the terminal controller transmits the collected refrigeration equipment data to the industrial IoT gateway through the LoRa wireless communication module, and the industrial IoT gateway processes and stores the transmitted data and sends the data information to the cloud monitoring platform; the comprehensive energy-saving algorithm analyzes and compares the collected data information with the set related parameters, and triggers the energy-saving control function when the control conditions of the comprehensive energy-saving algorithm are met; The comprehensive energy-saving algorithm includes an air suction floating algorithm and an anti-condensation control algorithm. The air suction floating algorithm is included in the terminal controller application, and the anti-condensation control algorithm is included in the industrial Internet of Things gateway application. The suction floating algorithm comprises the following steps: setting the refrigerant, suction pressure setting value, deviation value, suction pressure rise change, suction pressure drop change, suction pressure rise ratio, suction pressure drop ratio, suction group refrigeration equipment temperature upper limit, suction group refrigeration equipment temperature lower limit, suction pressure floating enable setting value in the terminal controller; setting the refrigeration equipment suction group, the terminal controller determines whether to adjust the suction pressure according to the actual value of the refrigeration equipment temperature in the suction group, and only determines the refrigeration equipment temperature in the refrigeration state; Take the average temperature of the refrigeration equipment in the refrigeration cycle, and determine whether the suction temperature should be adjusted up or down according to the average temperature. After the adjustment starts, determine whether it needs to be ended according to the real-time temperature of the refrigeration equipment; The anti-condensation control algorithm comprises the following steps: setting the minimum value of the anti-condensation heater, the maximum value of the anti-condensation heater, the percentage of the total power when the anti-condensation heater is at the minimum value, the anti-condensation control operation cycle, and the anti-condensation enable in the industrial Internet of Things gateway or platform; Set the anti-condensation group, obtain the on-site temperature and humidity according to the on-site temperature and humidity sensor, and calculate the dew point value. Control the heating of the heating wire according to the dew point value. When the heating time of the heating wire reaches the calculated set value, the heating wire stops heating.

2. According to claim 1, a comprehensive energy-saving control method for a refrigeration equipment IoT centralized monitoring system is characterized in that: The method for adjusting the suction pressure includes: determining the middle temperature of the refrigeration equipment, which is: (the upper temperature limit of the suction group refrigeration equipment + the lower temperature limit of the suction group refrigeration equipment) / 2, taking the temperature of the refrigeration equipment every 1-30 seconds, and the 1-30 seconds can be set as follows: ① When the temperature of 60-90% of the refrigeration equipment in the suction group is ≤ the middle temperature, 60%-90% is the settable value, and the suction pressure of the refrigeration equipment is increased, and it is adjusted every 1-30s, and 1-30s can be set until the temperature of the refrigeration equipment reaches (temperature upper limit -1)℃, and the pressure increase stops; ② When the temperature of 25%-40% of the refrigeration equipment in the suction group is ≥ the upper temperature limit, the suction pressure of the refrigeration equipment is adjusted downward, of which 25%-40% is an adjustable set value, which is adjusted every 1-30s, and 1-30s can be set until the temperature of 8%-30% of the refrigeration equipment is lower than the upper temperature limit, and the pressure reduction stops; ③For the refrigeration equipment after defrosting, when starting refrigeration again, it is necessary to wait for 15 minutes before comparing the temperature of the refrigeration equipment with the intermediate temperature; ④When the temperature of 45%-70% of the refrigeration equipment in the suction group is ≥ the intermediate temperature, the suction pressure is not adjusted, and 45%-70% is the adjustable set value; The above suction pressure adjustment is made between the suction pressure set value and the suction pressure floating upper limit value, and the suction pressure floating upper limit value is the suction pressure set value plus the deviation value.

3. According to claim 1, a comprehensive energy-saving control method for a refrigeration equipment IoT centralized monitoring system is characterized in that: The control of the heating wire heating according to the dew point value is specifically as follows: calculate the output duty cycle, Output duty cycle = C + (100–C) * (dew point value–A) / (B–A); If the dew point value < A, the heating wire is turned off; If the dew point value > B, the heating wire is turned on; Calculate the heating time, Heating time = output duty cycle * D, rounded to two decimal places by default and finally rounded to one decimal place; Calculate the stop time, Stop time = (1 - output duty cycle) * D, rounded to two decimal places by default and finally rounded to one decimal place; The meanings represented by A, B, C, and D are as follows: A is the dew point value (in degrees Celsius) when the anti-condensation heater is at its minimum; B is the dew point value (in degrees Celsius) when the anti-condensation heater is at its maximum; C is the percentage of the total power when the anti-condensation heater is at its minimum (%); D is the anti-condensation control operation cycle, that is, the sum of the on and off times (min).

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