The earliest automatic control can be traced back to the ancient automatic timer and leaky pot compass in China, and the wide application of automatic control technology began in the industrial revolution in Europe.
The Englishman Watt invented the centrifugal governor in 1788 by applying the feedback principle while inventing the steam engine. When the load or steam supply changes, the centrifugal governor can automatically adjust the opening of the intake valve, thus controlling the speed of the steam engine.
Extended data:
Control system classification
1, automatic control system
In order to realize all kinds of complex control tasks, the controlled object and the control device must be connected in a certain way to form an organic whole, which is the automatic control system.
In the automatic control system, the output of the controlled object, that is, the controlled quantity, is a physical quantity that needs strict control and can be kept at a constant value, such as temperature, pressure or flight trajectory.
The control device is the sum of related mechanisms that control the controlled object. It can control the controlled object through different principles and ways, but the most basic one is the feedback control system based on the feedback control principle.
2. Feedback control system
In the feedback control system, the control function of the control device on the controlled device is the feedback information from the controlled quantity, which is used to constantly correct the deviation between the controlled quantity and the controlled quantity, so as to realize the task of controlling the controlled quantity. This is the principle of feedback control.
References:
Baidu encyclopedia-automatic control
References:
Baidu encyclopedia-automatic control principle