Control theory
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Control theory is a field of control engineering and applied mathematics that deals with the control of dynamical systems. The aim is to develop a model or algorithm governing the application of syste
Centrifugal governor in a Boulton & Watt engine of 1788
Example of a single industrial control loop; showing continuously modulated control of process flow.
PID controller
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A proportional–integral–derivative controller, or three-term controller, is a feedback-based control loop mechanism commonly used to manage machines and processes that require continuous control and a
Control theory
…Sturm and in 1895, Adolf Hurwitz, who all contributed to the establishment of control stability criteria; and from 1922 onwards, the development of PID control theory by Nicolas Minorsky. Although the most direct application of mathematical control theory is its use in control systems engineering (dealing with…
Early PID theory was developed by observing the actions of helmsmen in keeping a vessel on course in the face of varying influences such as wind and sea state.
Pneumatic PID (three-term) controller. The magnitudes of the three terms (P, I and D) are adjusted by the dials at the top.
Typical setup for temperature controlling process. From left to right: resistance thermometer, Delta DTK4848V01 temperature controller with PID function, a solid-state relay
Response of PV to step change of SP vs time, for three values of Kp (Ki and Kd held constant)