PID control of control valves
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It’s a control valve with adjustable parameters; I would appreciate it if someone could explain the function of each of these adjustable parameters
What is the function of XP, TI, and TD in the time base?
The PID control of a control valve mainly includes three parameters: Proportional (P), Integral (I), and Derivative (D). 1. **Proportion (P)**: The proportion parameter determines the strength of the output’s direct response to error. If the proportion value is set too high, the system may oscillate ； If the proportion value is set too low, the response speed will be slow. 2. **Integral (I)**: The integral parameter is responsible for eliminating long-term deviations, causing the system output to stabilize at the set value in the end. The integral action accumulates errors; when these errors persist for a long time, it increases the corrective action in order to eliminate the steady-state error. 3. **Derivative (D)**: The derivative parameter is used in predictive control; it suppresses overshoot and oscillations in the system by responding to the rate of change of the error, thereby enabling the system to reach an equilibrium state more quickly. By adjusting these three parameters appropriately, the control valve can regulate the flow rate, pressure, and other properties of the fluid more precisely. .
upstairs explained the meaning of the three PID parameters. Regarding the question raised by the poster: this is a control system used abroad. The time base (SECS) indicates that it is based on seconds; after XP optimization, it operates in proportional mode. TI and TD refer to integration and differentiation respectively. Since the system adjustments are based on time, they can also be expressed as TI and TD. For more details, one can refer to the responses from the third floor member or Baidu; if that doesn’t work, it’s possible to consult the original process engineer