PID (Proportional-Integral-Derivative) control is a feedback control loop mechanism widely used in industrial control systems and a variety of other applications requiring continuously modulated control. A PID controller continuously calculates an error value as the difference between a desired setpoint and a measured process variable and applies a correction based on proportional, integral, and derivative terms. These three terms respectively respond to the present error, the accumulation of past errors, and the rate of change of the error. By tuning the three parameters (proportional gain, integral gain, and derivative gain), the PID controller can provide control action specifically designed for a particular process, aiming for stability, accuracy, and responsiveness.
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