Tag Archives | PID

PID-Tuning-Rules

PID Tuning Rules

Nearly every automation system supplier, consultant, control theory professor, and user has a favorite set of PID tuning rules. Many of these experts are convinced their set is the best. A handbook devoted to tuning has over 500 pages of rules. The enthusiasm and sheer number of rules is a testament to the importance of […]

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Simple-Robust-Auto-Tuning-Rules-for-2-DoF-PID-Controllers

Simple Robust Auto-Tuning Rules for 2-DoF PID Controllers

  Abstract: This paper addresses the problem of providing simple tuning rules for a two-degree-of-freedom (2-DoF) PID controller (PI2) with robustness considerations. The introduction of robustness as a matter of primary concern is by now well established among the control community. Among the different ways of introducing a robustness constraint into the design stage, the purpose […]

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vessel-control-loops-need-reset-time-increased-by-two-or-more-orders-of-magnitude-slider

How to Avoid Common Tuning Mistakes

The proportional, integral, derivative (PID) controller is the common key component of all control loops. Basic control systems depend upon the PID to translate the measurement signals into set points of secondary loop controllers, digital valve controllers, and speed controllers for variable frequency drives. The success of advanced control, such as model predictive control, depends […]

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near-integrating-process-response

PID Tuning for Near and True Integrating Processes

The most important loops on vessels and columns typically have a near or true integrating response. A self-regulating process is classified as near integrating if the process time constant is larger than four times the process dead time. The composition, pH, and temperature response of continuous columns tend to have a time constant to dead […]

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medical-manufacturing

Simple Enhancement of PID Control

The venerable PID is assuredly the most widely used algorithm in industrial process control. Its simplicity, reliability and familiarity make it a staple for closed-loop control throughout the industrialized world. Many control engineers apply this tool to every process or system requiring closed-loop control. Despite this default status as the “go-to” solution for feedback control, […]

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Colorful pipes

Use Signal Characterization in the DCS to Linearize the Installed Flow Characteristic of a Valve

Signal characterization to linearize valve installed flow characteristic has a bad reputation due to some practical implementation problems. These problems can be addressed today by doing the characterization in the distributed control system (DCS), but the stigma remains. With pneumatic positioners, signal characterization was done by the use of a cam. Standard cams were based […]

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oil valve

How to Use Valve Position Control to Optimize Process Efficiency and Capacity

There are many opportunities for process optimization by valve position control (VPC). Table 1 summarizes common examples of the use of VPC for increasing process efficiency and capacity. Efficiency is increased by reducing energy and raw material costs for a given production rate. Capacity is increased by increasing feed rates for a given efficiency. Table […]

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