Automatic control system has been widely used in various fields of human society.



In the industry, for the metallurgical, chemical, machinery manufacturing and other production processes encountered in a variety of physical quantities, including temperature, flow, pressure, thickness, tension, speed, position, frequency, phase, etc., have a corresponding control system. On this basis, through the use of digital computers also set up a better performance control and higher degree of automation of the digital control system, and has a dual function of control and management of the process control system. In the agricultural applications, including water level automatic control system, agricultural machinery, automatic operation system.



In the military technology, automatic control of the application examples are various types of servo systems, fire control systems, guidance and control systems. In aerospace, aviation and navigation, in addition to various forms of control systems, the application areas also include navigation systems, remote control systems and various simulators.



In addition, in the office automation, library management, traffic management and daily household chores, automatic control technology also has a practical application. With the development of control theory and control technology, the application of automatic control system is still expanding, almost involving biological, medical, ecological, economic, social and other fields.