Proportional-Integral-Derivative Controllers

A PID (Proportional-Integral-Derivative) controller is a feedback-based automation system that continuously compares a desired target value with actual system performance and applies corrective adjustments using three mechanisms: the proportional component responds to current error magnitude, the integral component addresses accumulated past errors, and the derivative component predicts future error trends to prevent overshoot. Originating from automatic ship steering systems in the 1920s, PID controllers are now widely used in industrial applications such as vehicle cruise control, temperature regulation, and motor speed control to achieve accurate, stable automatic operation without human intervention.