Thursday, December 31, 2015

PID Control Process Loop Control Explained

PID Loop
PID Loop
PID control stands for proportional, integral and derivative and is a very common control mode used in process control and manufacturing. PID is used in process loops such as pressure control, temperature control, flow and level control. It is also used in robotics, as shown here.

A better description, from Wikipedia, is the continuous calculation from "an error value as the difference between a measured process variable and a desired setpoint. The controller attempts to minimize the error over time by adjustment of a control variable, such as the position of a control valve, a damper, or the power supplied to a heating element, to a new value determined by a weighted sum".

The video below provides a detailed explanation into how PID control works.