A Parameter Self-tuning Method of pid System

Abstract

The invention discloses a parameter self-tuning method of a PID system. This PID system parameter self-tuning method effectively prevents the system output wave from oscillating near the target value SV or deviation value (SV_n) during the self-tuning process, and the system sampling value PV reaches the target value SV before stopping the control object. The excitation is applied to ensure that the system output wave can always reach the control target value SV, and the PID control parameters calculated by the controller are more accurate. In addition, the self-tuning method, regardless of the initial state of the system, first collects the working condition signal, and then according to the collected value Comparison of PV and deviation value (SV_n) to determine whether to apply excitation to the control object, that is, the judgment of its working condition takes precedence over the control output, effectively preventing the occurrence of overshoot and avoiding the occurrence of industrial accidents; the self-tuning process does not need complete The waveform, that is, the corresponding period, shortens the time of the self-tuning process, thus increasing the detection speed of the system's self-tuning, and avoiding the occurrence of industrial accidents.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a parameter self-tuning method of a PID system. Background technique [0002] In industrial process control, the control system that is controlled according to the proportion, integral and differential of the error generated by comparing the information collected by the real-time data of the controlled object with the given value is referred to as the PID control system. PID control has the advantages of simple structure, good stability, and reliable operation. It is still the most commonly used control method in industrial process control. The classic PID control method includes proportional regulation, integral regulation and differential regulation at the same time. Since the integral regulation often causes problems of overshoot or oscillation, an integral-separated PID control method appears in the prior art. The main principle is that the integral adjustment is ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to provide a kind of parameter self-tuning method of the PID system that determines the parameter group to be measured by detecting the inertia and the rate of change of the target system, and solves the difficult problem of obtaining the optimal PID controller parameter group