Closed loop control / PID Control


Closed-loop control (PID control) refers to the process in which a physical variable (e.g., room temperature) is to be brought to a particular value while being stabilized against disturbances.

The controller is the component that acquires the actual value and derives a control signal from the difference between the setpoint and actual value. The controller then activates a final controlling element (e.g., heater) that compensates for the control deviation.

example of a simple closed-loop-control application

The  diagram illustrates the relationship of the controller, final controlling element, and controlled system using a closed-loop temperature control in a house.

Autotuning ensures optimal PID-settings