Fuzzy PID-based control method and device, and PLC control system

Abstract

The invention provides a fuzzy PID-based control method and device, and a PLC control system. The method comprises the steps: calculating a current error and a deviation change between the current error and a historical error according to a measured value and an expected value, obtained in real time, of to-be-controlled parameters of controlled equipment, and carrying out the operation of the deviation change between the current error and the historical error through a preset fuzzy rule; and acquiring the values of the parameters Kp, Ki and Kd of a PID control algorithm so that the parametersof the PID control algorithm are optimized and adjusted in real time. A defect that the parameters of the traditional PID control algorithm cannot be adjusted in real time is overcome, the to-be-controlled parameters of the controlled equipment are adjusted according to the values of Kp, Ki and Kd and the current error, and all the to-be-controlled parameters of the controlled equipment are kept in a stable state.

Description

technical field [0001] The application relates to the field of automatic control, in particular, to a fuzzy PID-based control method, device and PLC control system. Background technique [0002] In order to ensure that the environmental experimental equipment can work normally, it is usually necessary to precisely control the parameters of the environmental experimental equipment, especially the environmental temperature, humidity and other parameters. [0003] The commonly used control method is to control the parameters of the environmental experimental equipment through the PID (proportion-integral-differential) controller or relay, but the adaptability of this control method is poor. If the environmental experimental equipment If the temperature of the working environment changes or the system hardware changes, the previously set parameters cannot meet the experimental requirements and need to be readjusted. Contents of the invention [0004] In order to at least over...

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Problems solved by technology

[0003] The commonly used control method is to control the parameters of the environmental experimental equipment through the PID (proportion-integral-differential) controller or relay, but the adaptability of this control method is poor. If the environmental experimental equipment If the working environment temperature changes or the system hardware changes, the previously set parameters cannot meet the experimental requirements and need to be readjusted.

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