PID adjustment setting rules - Solutions - Huaqiang Electronic Network

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PID is based on P. P is the magnification of the negative feedback control. Negative feedback control is an amplifier. The output of the amplifier is entered by the feedback circuit and compared with the set value of the input. Because it is negative feedback, it is a difference. Using this difference to control the change in output, PID solves some problems that are difficult to solve with negative feedback. For example, if the multiple of the P amplification of the negative feedback control is too large, it will overshoot and oscillate. Another problem is the negative feedback value and the set signal value. The signal direction of these two values ​​is opposite. If the set value and the negative feedback value are similar, the difference will be equal to zero. It will oscillate very much when it comes out. And PID is the improvement of negative feedback, using the integral to get closer to the set value, but there is a premise, your P should be done quite well, this proportional coefficient P should be appropriate, when the output oscillates within a limited range, P Yes. Then add I, I will definitely reduce this swing after adding it. The swing will become smaller and smaller and eventually stabilize. The smaller I is, the more control it has, so I is slowly added from small to small. The greater the P, the greater the control intensity. It doesn't matter if the general control D is added or not. When to add D, when the start is slowly adjusted, the reaction is very intense and suddenly rises and then swings down. If you rise too fast, you need to add D, D can suppress it to rise up at once. In another case, there is still oscillation when P and I are added. At this time, you can add D to it appropriately.