The closed loop system is also known as "feedback system". Symmetrical "open loop system". The input affects the output of the system and the direct or indirect system of the output. This type of system has several closed loop structures. For example, cars and drivers constitute a closed loop system. According to the vehicle speed and position, the driver adjusts the steering wheel and the throttle, brakes to ensure that the car is driving on the correct route. Various social, economic, management and other systems are closed loop systems. The closed loop is the basic model of all life processes and human socioeconomic processes in nature. In a closed loop system, feedback information is taken from the system state, which is a basis for making decisions; via decision control changes system status, and this state affects future decisions. This process process is continuous, looped, it is difficult to accurately say where the closed loop is from where to start. The research object of system dynamics is generally a closed loop system.
Closed-loop control system is an automatic control system that constitutes a closing loop in a signal forward path and feedback path, also known as a feedback control system.
Component by servo motors, compare lines, servo amplification lines, speed detectors, and position detectors mounted on the table in CNC machine tools. This system automatically detects the actual displacement of the table and compares the command value, and is controlled by the difference. This system is highly positioned, but the system is complex, debugging and maintenance. It is more expensive. It is mainly used for high-precision and large number of control machine outputs directly or indirectly feed back to the input, and form a closed loop-participated control. System, also called feedback control system
In order to achieve closed-loop control, the output must be measured, and the measured results are fed back to the input and the input amount is subjected to a deviation, and then the deviation generates direct control action to eliminate deviation. The entire system forms a closed loop. The nature of the closed-loop delivery system and the open-loop transfer system is that the output of the closed-loop system has control effect on the system, and the output of the open loop system does not control the system. The impact of the closed-loop control system · Output on system control is carried out by feedback (generally negative feedback).
For the automatic control system, the closed loop system, in the block diagram, the input of any of the links can be affected by the feedback. When the input of the control device is subjected to the feedback effect, the system is called a fully closed loop system, or is referred to as a closed loop system.
A closed-loop automatic control system is mainly composed of a control section and a controlled part. The function of the control section is to accept the feedback signal of the instruction signal and the controlled portion, and the control signal is sent to the controlled portion. The function of the controlled portion is to accept the control signal, send a feedback signal, and implement the controlled movement under the action of the control signal.
