What are the links that an automatic control system usually consists of?

Controllers, actuators, detectors.

The automatic control system is mainly composed of four links: controller, controlled object, actuator and transmitter.

Controller: The main command device that can change the wiring of the main circuit or control circuit and change the resistance value in the circuit to control the start, speed regulation, braking and reverse of the motor according to the predetermined sequence.

Controlled object: generally refers to the controlled equipment or process as the object, such as the control of reactor and distillation equipment, or the control of heat transfer process and combustion process. From the perspective of quantitative analysis and design, the control object is only a part of the factors that affect the input and output parameters of the controlled equipment or process, but not all of the equipment.

Actuator: Uses liquid, gas, electricity, or other energy sources and converts them into actuation by motors, cylinders, or other devices.

Transmitter: The function is to detect the process parameters and transmit the measured values in the form of specific signals for display and adjustment. The function in the automatic detection and adjustment system is to convert various process parameters such as temperature, pressure, flow, liquid level, composition and other physical quantities into a unified standard signal, and then transmit it to the regulator and indication recorder for adjustment, indication and recording.

The internationally recognized automatic control system is generally composed of the following seven parts:1Given link.

2.Comparison link. 3.

Correction link. 4.Zoom in on the link.

5.Actuator. 6.

Accused object. 7.Detection device.

First, the automatic control system is generally composed of four links: the object (the process to be controlled), the controller, the transmitter and the regulating valve;

Second, the automatic control system is generally a closed-loop (or open-loop) control system composed of sensors, regulators, actuators and controlled objects.

Three: a simple process control system is generally composed of a regulator (controller actuator), a controlled object (controlled process) and measurement and transmission;

Fourth, the system is composed of a controlled object and an automatic control device (including a detection instrument, a regulating instrument, and an actuator).

Five: the execution unit is an important part of the automatic control system. Any of the simplest control systems must also consist of a detection link, a regulating unit and an actuator.

Sixth: the automatic control system is composed of four links: the object (the process to be controlled), the controller, the transmitter and the regulating valve.

It is composed of three parts: actuator, measuring element and control element.

The actuator is used to change the controlled quantity, such as the motor as the actuator can change the angle of the manipulator;

The measuring element is used to measure the controlled quantity, such as the use of resolver or code disc isoangular position measuring element can detect the rotation angle of the manipulator;

The control element is used to realize closed-loop control and improve the performance of the controlled system, which is generally realized by analog circuits, DSP, PLC or computer and other components, which can correct the controlled object and change the open-loop transfer function of the system, so that the closed-loop system can meet certain performance index requirements.

The automatic control system consists of a controller and a controlled object. However, in order to achieve complex control tasks, a typical automatic control system should also include: a fixed value element, an actuator, a measuring transmitter and a comparison element.

According to the different control principles, the automatic control system is divided into open-loop control system and closed-loop control system.

Open-loop control system: In the open-loop control system, the output of the system is only controlled by the input, and the control accuracy and the characteristics of suppressing interference are relatively poor. In the open-loop control system, the logic control based on timing is called the sequential control system; It consists of a sequential control device, a detection element, an actuator and a controlled industrial object.

Closed-loop control system: The closed-loop control system is based on the feedback principle, and the system can be controlled by using the deviation of the output from the expected value, which can obtain better control performance. A closed-loop control system is also known as a feedback control system.

The main links include giving, conversion, calculation, detection, feedback, output and so on. Its characteristics and functions can be understood from the literal meaning of the link name.