What is PID Control?

PID control is a control loop feedback mechanism in which the controller continuously calculates an "error value" as the difference between a measured process variable (PV) and a desired set point.
This Proportional, Integral and Derivative controller attempts to minimize the error over time by adjustment of a control variable to a new value.
In this control, P accounts for present values of the error, I accounts for past value of the error, and D accounts for predicted future values of the error, based on its current rate of change.
PID control is a control loop feedback mechanism in which the controller continuously calculates an "error value" as the difference between a measured process variable (PV) and a desired set point.
This Proportional, Integral and Derivative controller attempts to minimize the error over time by adjustment of a control variable to a new value.
In this control, P accounts for present values of the error, I accounts for past value of the error, and D accounts for predicted future values of the error, based on its current rate of change.