A control system is a means by which any interesting or variable quantity within a machine, mechanism, or other equipment can be maintained and changed in a desired manner. A control system is implemented to bring the controlled object to a predetermined ideal state. It causes the controlled object to tend towards a desired stable state.
Control systems have been widely applied in all areas of human society. In industry, various physical quantities encountered in production processes such as metallurgy, chemical engineering, and machinery manufacturing, including temperature, flow rate, pressure, thickness, tension, speed, position, frequency, and phase, have corresponding control systems. Based on this, the use of digital computers has led to the establishment of digital control systems with better control performance and higher levels of automation, as well as process control systems with dual control and management functions. Applications in agriculture include automatic water level control systems and automatic operating systems for agricultural machinery.
