What do PID control and sequential control mean?
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What do PID control and sequential control mean?
PID stands for proportional, differential, and integral control. Used to stabilize process parameters at fixed values. Sequence control: Controlling each control stage one after another in accordance with a pre-determined sequence or conditions
As I understand it, taking a valve as an example, P refers to the amount of adjustment per time, I refers to the speed of adjustment, and D refers to the predicted adjustment
Put simply, PID control means using control valves to adjust parameters such as liquid level, flow rate, pressure, and temperature – all of which are examples of PID control. Sequential control, on the other hand, involves controlling processes in a specific order over time; for example, it refers to the controlled sequence in which the valves used in molecular sieve dehydration or pressure swing adsorption are opened
The control target for PID control is the control valve, while the control target for sequential control is the on/off valve
PID control is a relatively precise control method. P stands for proportional control, I stands for integral control, and D stands for derivative control. The size of P affects the speed at which the valve operates, that is, the amplitude of fluctuations in this parameter. I refers to the time over which the deviation accumulates; relatively speaking, a longer period results in greater stability, and the valve does not operate too frequently. D refers to the advance action time, which is generally used only for temperature control; it is set to zero for other types of control.
PID control is a control method that makes continuous adjustments based on the deviation between the set value and the measured value. It can be divided into two cases: 1. When the set value remains unchanged, the controlled parameter is adjusted to this set value after being perturbed; in this case, PID is constant-value control ； 2. The set value changes in a regular pattern, causing the controlled parameter to change accordingly; in this case, the PID control is a follow-up control. Sequential control involves carrying out operations at regular intervals. Most rhythms are temporal rhythms. In other words, the controlled process is operated in a rhythmic manner.