PID Control

PID control is a feedback control technique that continuously adjusts a process output based on the proportional, integral, and derivative of the error between a measured value and a desired setpoint. It is the most widely used control algorithm in industrial automation for regulating temperature, pressure, flow, and speed.

A PID controller computes three terms from the error signal: the proportional term reacts to present error, the integral term eliminates accumulated steady-state offset, and the derivative term anticipates future error from its rate of change. Tuning these gains balances fast response against stability and overshoot. PID matters in industry because it provides robust, model-free regulation that works across countless processes, from boiler temperature to motor speed, with predictable and well-understood behaviour.