文档介绍：Automatic control (automatic control) refers to the direct participation of people in the absence of circumstances, the use of additional equipment or devices, machinery, equipment or production processes of a job status or parameters to automatically run in accordance with the law book.
Automatic control is a relative concept in terms of manual control. Refers to the participation of people in no circumstances, the use of control devices so that the object or process to automatically run according to the law book. Automatic control technology is conducive to human from plex, dangerous, tedious work out of the environment and greatly enhance the liberation of control efficiency. Automatic control is a branch of engineering science. It involves the principle of the use of feedback on the impact of dynamic system of automatic, so that the output value near the value we want. From a methodological point of view, it's math is based on systems theory. Today, we are known as the automatic control of the mid-twentieth century created a branch of control theory. The basic conclusion is that by Norbert, put forward by Rudolf Kalman.
For example: the regulation of interior temperature of the interior temperature regulation is an easy-to-understand examples. The purpose is to maintain the interior temperature at a fixed value of θ, even though factors such as the window makes the interior heat outdoors (interference d). To this end, the heating must be appropriate impact. Through the valve adjustment, the temperature will remain constant. In addition, people have felt before, the temperature of heating water temperature would have been affected by external interference. Examples of the remaining three tank system also.
Developments in the field of process automation
More than 150 years ago the first generation of process control system is based on the 5-13psi pneumatic signal standard (pneumatic control system PCS, Pneumatic Control System). Simple mode of operation of t