How to set and adjust PID parameters

Abstract: How to set and adjust PID parameters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. PID is proportional calculus adjustment. For details, you can refer to the detailed introduction in the automatic control course! The positive action and the negative action in the temperature control is that when the positive action is heating, the negative action is cooling control. Introduction to PID control The current level of industrial automation has become a measure. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of how to set and adjust PID parameters. PID is proportional calculus adjustment. For details, you can refer to the detailed introduction in the automatic control course! The positive action and the negative action in the temperature control is that when the positive action is heating, the negative action is cooling control. Introduction to PID Control At present, the level of industrial automation has become an important symbol to measure the modernization level of all walks of life. At the same time, the development of control theory has also experienced three stages: classical control theory, modern control theory and intelligent control theory. A typical example of intelligent control is a fuzzy fully automatic washing machine, etc. Automatic control systems can be divided into open-loop control systems and closed-loop control systems. A control system includes a controller, a sensor, a transmitter, an actuator, and an input and output interface. The output of the controller is added to the controlled system through the output interface and the actuator; the controlled quantity of the control system is sent to the controller through the input interface through the sensor and transmitter. Different control systems have different sensors, transmitters, and actuators. For example, the pressure control system uses a pressure sensor. The sensor of the electric heating control system is the temperature sensor. At present, there are many PID control and its controllers or intelligent PID controllers (instruments), and the products have been widely used in engineering practice. There are various PID controller products, and major companies have developed PID controllers. The intelligent regulator with parameter self-tuning function (inligentregulator), in which the automatic adjustment of PID controller parameters is realized by intelligent adjustment or self-correction and self-adaptive algorithm. There are pressure, temperature, flow, liquid level controllers realized by PID control, programmable logic controllers (PLC) that can realize PID control functions, and PC systems that can realize PID control. Programmable Logic Controller (PLC) uses its closed-loop control module to realize PID control, and Programmable Logic Controller (PLC) can be directly connected with ControlNet, such as Rockwell's PLC-5. There are also controllers that can realize PID control functions, such as Rockwell's Logix product series, which can be directly connected to ControlNet and use the network to realize its remote control functions. 1. Open-loop control system Open-loop control system (open-loop control system) means that the output (controlled quantity) of the controlled object has no effect on the output of the controller. In this kind of control system, it does not rely on sending the controlled quantity back to form any closed loop. 2. Closed-loop control system The characteristic of closed-loop control system is that the output (controlled quantity) of the controlled object of the system will be sent back to affect the output of the controller, forming one or more closed loops. The closed-loop control system has positive feedback and negative feedback. If the feedback signal is opposite to the given value signal of the system, it is called Negative Feedback. If the polarity is the same, it is called positive feedback. Generally, the closed-loop control system adopts negative feedback. Also known as negative feedback control system. There are many examples of closed loop control systems. For example, human is a closed-loop control system with negative feedback, eyes are sensors, acting as feedback, and the human body system can finally make various correct actions through continuous correction. Without eyes, there is no feedback loop, and it becomes an open-loop control system. Another example, when a real automatic washing machine has the ability to continuously check whether the clothes are washed, and automatically cut off the power after washing, it is a closed-loop control system. 3. Step response Step response refers to the output of the system when a step input (stepfunction) is added to the system. Steady-state error refers to the difference between the expected output of the system and the actual output after the response of the system enters the steady state. The performance of the control system can be described by three words: stable, accurate and fast. Stability refers to the stability of the system. In order for a system to work normally, it must first be stable, and it should be convergent from the point of view of the step response; accuracy refers to the accuracy and precision of the control system. It is described by Steady-stateerror, which represents the difference between the steady-state value of the system output and the expected value; fastness refers to the rapidity of the response of the control system, which is usually quantitatively described by the rise time. 4. The principle and characteristics of PID control In engineering practice, the most widely used regulator control laws are proportional, integral and differential control, referred to as PID control, also known as PID regulation. It has been nearly 70 years since the PID controller came out, and it has become one of the main technologies of industrial control because of its simple structure, good stability, reliable operation and convenient adjustment.

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