Research And Design Of Intelligent Heating System Based On BLE＿Mesh

In the context of China’s "dual carbon" policy,reducing carbon emissions and improving coal utilization efficiency have become important reform directions in China.The traditional centralized heating system has the problems of extensive management,inability to monitor in real time,low degree of automation control,large power consumption,difficulty in balance adjustment and uneven user temperature.In the era of rapid development of Internet of Things technology,intelligent transformation of heating system is imperative.According to the idea of "wireless network+heat supply network balance+automatic adjustment",this thesis designs and implements a smart heating system based on BLE Mesh BLE(Bluetooth Low Energy,BLE)Mesh.In this thesis,the fuzzy PID(Proportional-IntegralDerivative Control,PID)control algorithm is used to intelligently transform the heating system,and the BLE Mesh wireless network is used for data transmission and real-time monitoring of the heating network platform.The user side secondary metering and regulation scheme is designed to solve the balance problem of the heating network,and the end valve control device is designed to achieve accurate regulation of the system.In order to solve the problems of high energy consumption and low degree of automation control in the heating system,a fuzzy PID control scheme is proposed in this thesis.The control effect of fuzzy PID was verified through simulation research;The application of fuzzy PID algorithm in the heating network platform server reduces the computational complexity of the physical controller and avoids the disturbance problem caused by the controller.On the basis of stable heat source and primary pipe network parameters,a user side secondary metering control scheme is proposed to solve the imbalance problem of the heating pipe network in the system.The primary metering control solves the horizontal hydraulic imbalance at the building,and the secondary metering solves the vertical hydraulic imbalance at the user.Adopting low-power BLE Mesh technology for close range data transmission,4G for medium to long distance data transmission from gateway to heating network platform,connecting hardware devices in the system to the heating network platform,and monitoring the system and user situation in real-time.This thesis focuses on the hardware design of BLE devices and data concentrators.Through the networking of BLE Mesh nodes,low-power strategy,and system communication protocol design,the system achieves low-power and highly stable wireless network data transmission.And tested and verified the networking,communication,and power consumption of BLE devices.In order to achieve the precise control of the intelligent heating system and follow the control principle of "local" end users,the user side valve control device is designed and implemented.We have selected controller MCU devices and designed peripheral circuits,and developed software driver programs based on hardware circuit design.The control accuracy of the system has been improved by designing a precise constant current source circuit for data collection and a valve stroke control algorithm program.And conduct joint debugging and testing with BLE equipment.The test results show that the use of low-power design for BLE devices reduces power consumption by about 26%compared to the original,which to some extent reduces overall power consumption.Through the analysis of the actual operation data,the intelligent heating system has effectively solved the problem of uneven temperature caused by the imbalance of the system pipe network.