What is the impact of the PID value size on the operation of the control valve?
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The impact of PID value levels on control valves has not been fully understood; for example, how should the PID values be adjusted when the control valve operates slowly, and what does PID represent?
As a newcomer, I earnestly ask for your help in resolving my doubts. Thank you!
p-proportion i-differential d-integral
In simple terms, my understanding of PID is P (magnitude), I (speed), and D (timing).
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Controller PID parameters: Kp is the proportional gain, or δ is the proportionality degree (the reciprocal of the proportional gain). It indicates the sensitivity to deviations; the larger Kp, the greater the sensitivity. The larger Kp is, the higher the sensitivity of the system, and the more unstable it becomes ； Integration time Ti, or integration gain Kp/Ti. It indicates the strength of the ability to eliminate residual errors; the smaller the Ti, the stronger this ability, while an infinite Ti indicates no integral effect. Decreasing Ti enhances system oscillation ； Differential time Td, or differential gain Kp × Td. It indicates the sensitivity to the rate of deviation change; the larger Td is, the greater the sensitivity. An appropriate increase in Td can reduce the dynamic deviation during the transition process, while an excessively large Td can lead to system instability.