Due to the development of computer technology, control technology, communication technicians and image technology, the application of microcomputer control technology in the automatic control of refrigeration and air conditioning has become more and more common. After the traditional control system is introduced into the microcomputer, it can make full use of the computer's powerful arithmetic operations, logic operations and memory functions, and use the microcomputer instruction system to compile software that conforms to the control law. The microcomputer executes these programs to realize the control and management of the controlled parameters, such as data acquisition and data processing.
The computer control process can be summarized into three steps: real-time data acquisition, real-time decision-making and real-time control. The continuous repetition of these three steps will enable the entire system to be controlled and adjusted according to the given law. At the same time, it also monitors the controlled variables and equipment operating status, faults, etc., limits alarms and protections, and records historical data.
It should be said that computer control in terms of control functions such as accuracy, real-time, reliability, etc. is beyond analog control. More importantly, the enhancement of management functions (such as alarm management, historical records, etc.) brought about by the introduction of computers is beyond the reach of analog controllers. Therefore, in recent years, in the application of automatic control of refrigeration and air-conditioning, especially in the automatic control of large and medium-sized air-conditioning systems, computer control has been dominant.