In this paper, the author visited DEVI (Denver, the world’s largest supplier of heating equipment and control parts) in Denmark in March 2003 to investigate the intelligent control manufacturing technology of floor radiant heating system, and combined with the customer feedback of the intelligent heating system temperature controller installed and used in Shanghai area for more than ten years. According to this, the design and development of the intelligent heating system terminal temperature controller are deeply studied and analyzed, hoping to provide some reference and help for the design of the terminal temperature controller, improve the effectiveness of the design of the intelligent heating system terminal temperature controller and meet the actual use needs, and then expand the terminal temperature control. The device is used nationwide to achieve energy saving and emission reduction. There is a differential demand for heating in the southern region of China, which leads to the demand for household installation and control. In view of Europe’s centuries of household heating experience, in the early stage of product selection, we mainly take European suppliers as the main suppliers to design and apply the system. In northern China, central heating is the main way of winter heating, which adopts centralized control without installing heat control equipment household by household. Such system design has serious heat energy cost and resource consumption, and increases environmental pollution. The design of intelligent heating system terminal temperature controller uses electrothermal flow valve to regulate the flow, so as to effectively control and alleviate the waste of heating resources in winter. Users can set their own temperature according to their own needs, and can save heat while ensuring comfort. This paper studies and analyses the design and development of intelligent heating system temperature controller. At present, the main heating system is hot water centralized heating. The indoor part contains water pipes, heat dissipation equipment and control valves. These structures together constitute a control loop. When the indoor temperature changes, thermostatic element the door temperature controller with room temperature sensor can control the opening of flow valve through the controller, realize the effective control of heating water flow, reduce the radiator heat dissipation, and realize the effective adjustment of indoor temperature. In addition, in order to prevent the discomfort caused by excessive ground temperature or the destruction of ground materials, a household temperature controller with dual sensors of room temperature and ground temperature can be used. That is to say, the whole system takes the heating water pipe valve as the control object. After the controller sends out control instructions, the indoor temperature can be effectively adjusted by controlling the opening of the valve. Central heating is the main mode of heating in northern China. In the future, if the household controller and temperature control valve are typed in the design of heating system, the heating cost can be greatly saved while meeting the heating needs of users. Users can set the indoor temperature through the household controller according to their own needs, so that different heating areas have different temperatures in different time periods. For example, when they go out to work, the room temperature can be reduced, and the temperature of the rest room at home can be increased accordingly. By this way, the rationality of heating energy utilization can be significantly improved, and the loss of heat energy can be reduced. Waste to achieve energy conservation and emission reduction. The system design includes two operation modes, one is program control, which is divided into three categories: daily, holiday and home mode. The daily mode is from Monday to Friday, which is divided into home time, work time and sleep time. The vacation mode refers to running in the absence of a person at home; the home mode refers to weekend double rest time. Segment running. The other is manual settings, which are more flexible and autonomous.
In the aspect of hardware structure design of the controller, modular design method is chosen, which is divided into different modules. According to the specific control requirements and working principle, the controller display selects 2.4 inch TFT touch LCD screen to facilitate user’s viewing and modification. For wet running space such as bathroom, dial panel can be used instead of LCD control panel to ensure the service life of hardware. During the operation of the controller, the system clock automatically enters the corresponding working mode. The controller collects the room temperature through a temperature sensor, displays the room temperature value and combines the temperature change to realize the effective control of the room temperature. The electrothermal valve is selected as the actuating device to control the flow of water pipe effectively. In the whole control structure, users can set operation parameters by themselves. In the aspect of system communication, RS232 serial communication mode is selected to realize effective communication between the controller and the upper computer. The control core is STC12C5A60S2 MCU, which has strong anti-static and interference ability, fast operation speed, online programming support, and remote upgrade. Flow control valves are widely used in heating, refrigeration and other control systems. Currently, electric control valves are commonly used to control the flow of various fluid media.
The principle is that the sensor receives the control signal, converts it into analog and switching signals, and inputs them to the actuator. The actuator moves the valve spool to control the valve opening and realize the effective control of the medium flow.
The design of system control program includes display storage program, system initialization, timing interruption program and so on. The device starts up and enters the initialization state. Then the controller runs the control program and reads the operation parameters of each module. The operation state of the controller includes manual setting and program control. Without touching the keys, the system adopts program control mode.
When touching the keys, the system enters the setting state. The communication between PC and controller is realized by serial port. In the programming of serial port communication, the communication protocol between configuration software and MCU must be clear. In the process of designing the temperature controller, it is difficult to establish an accurate digital model for the temperature control system of the household terminal because the parameters and characteristics of the electrothermal valve have not yet been determined, and the change of room temperature has obvious lag characteristics.
In order to solve this problem effectively, temperature control chooses the idea of PID control. Compared with the conventional control idea, the idea of PID control can take the set temperature as the critical point. If the temperature is lower than the critical point, the system will automatically heat. When the temperature is higher than the set critical point, the system will stop heating. The idea of PID control has the characteristics of high control progress and low lag in practical application, which can achieve very good application results. In the aspect of circuit board design, combined with circuit schematic printing, it meets the needs of design function. Firstly, the circuit board is made according to the design drawings. After the circuit board is made, the multimeter is used to judge whether the printed circuit has short circuit or break circuit. After that, the welding of PCB is completed in the order of small to large and from inside to outside. In terms of development environment, we choose Force Control V7.
0 software, which has powerful configuration function, good compatibility, flexible and reliable monitoring system platform, and can significantly improve the function of the test system. In terms of test requirements, the test system should have the functions of signal acquisition, monitoring operation, dynamic display, data recording and so on. In the design of test system, attention should be paid to the design of man-machine interface, which is displayed in the window to realize the effective relationship between software and users.
In the aspect of display window design, according to the actual needs of users and test requirements, the layout is adjusted to achieve different functions. In October 2006, the author registered “Diwei DIVE” trademark in the State Administration for Industry and Commerce, in order to promote the introduction of cost-effective household temperature controller in the field of household control, and realize its wide application in the field of temperature control. The design and development of temperature controller for intelligent heating system need to be based on the technological requirements of temperature control system, complete the overall structure design, and clarify the design ideas of hardware circuit and software program, so as to improve the effectiveness of the whole temperature control system design. With the improvement of people’s awareness of energy saving and emission reduction, the design of this control system needs to be optimized and improved continuously, such as using thyristor instead of relay to improve the timeliness of opening control of electrothermal valve. At the same time, it can also apply key shaking technology to avoid key failure or program dysfunction. PID control mode is easily affected by external environmental factors, and a set of adaptive control algorithm needs to be developed to better meet the control needs. In the future, temperature controllers can also be more widely used in outdoor parking lots, steps, sloping pavement and bridges for ice melting and snow melting applications. Benefit the people’s livelihood with electromechanical technology, and achieve energy saving and emission reduction with electromechanical technology. More relevant technical data can be consulted in the Technical Regulations for Shanghai Ground Radiation Heating compiled by the author.