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PID open-loop and closed-loop explanation? thank you

Please refer to this answer/question /99876864.html first.

Simply put, open loop means no feedback. Closed loop means feedback. For example, if you want the speed to be 70, the result is 70 (expected) -68 (actual) =2 (deviation), and the PID will be proportional, integral, differentiated and then come out. Proportional control, such as 2 is too small and insensitive. If the magnification is several times to 20, the reaction will be faster, ok.