Efficient PID control method and device, and controller

Abstract

The invention discloses an efficient PID control method and device, and a controller. The method comprises the steps: setting a proportionality coefficient, an integral coefficient and a differential coefficient as integer data in a PID operation period; obtaining a current error value, a previous error value and a previous second error value, and dividing a difference value between the current error value and the previous error value by the proportionality coefficient to obtain a deviation of a proportional link, wherein the deviation of the integration link is equal to the current error value divided by the integration coefficient; and the deviation of the differential link is equal to a preset multiple obtained by subtracting the previous error value from the current error value, and the deviation is divided by the differential coefficient after being added with the previous error value; accumulating the three deviation values to obtain a final error; and adding a preset target value to the final error to obtain an output value of the PID controller. According to the technical scheme, a traditional PID algorithm is optimized, and the actual value can follow the target value under the condition that the time takt of other tasks is not affected.

Description

technical field [0001] The invention relates to the technical field of electrical control, in particular to a high-efficiency PID control method, device and controller. Background technique [0002] In the control system, the PID controller based on the PID (proportional (P), integral (I) and differential (D) of deviation) algorithm is a widely used automatic controller. When the traditional PID algorithm realizes that the actual value follows the target value on the digital controller, it has the following disadvantages: the three parameters of Kp, Ki, and Kd all use floating-point calculations, which greatly occupy the CPU resources of the single-chip microcomputer and affect the timing of other tasks. Accuracy; and if the PID operation takes up too many machine cycles, resulting in low computing efficiency; at the same time, it leads to an increase in the difficulty of PID parameter adjustment. Contents of the invention [0003] An embodiment of the present invention p...

AI Technical Summary

Problems solved by technology

When the traditional PID algorithm realizes that the actual value follows the target value on the digital controller, it has the following disadvantages: the three parameters of Kp, Ki, and Kd all use floating-point calculations, which greatly occupy the CPU resources of the single-chip microcomputer and affect the timing of other tasks. Accuracy; and if the PID operation takes up too many machine cycles, resulting in low computing efficiency; at the same time, it will increase the difficulty of PID parameter adjustment

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