What is the purpose of PID tuning in a control system?

• A. Maximize speed at any cost, causing instability.
• B. Use only the P gain to eliminate response.
• C. Set the P, I, D gains to achieve stable, responsive control without overshoot or oscillations.
• D. Disable the controller and run open loop.

Answer: (C)

PID tuning sets the three gains so the control loop becomes both stable and responsive. The proportional term quickly reduces the current error, the integral term removes any steady-state error by accumulating past errors, and the derivative term dampens rapid changes to prevent overshoot and oscillations. When these gains are balanced correctly, the system reaches the desired setpoint promptly with minimal overshoot and settles smoothly, even in the face of disturbances. P by itself often leaves a steady-state error and can lead to chattering or instability if pushed too far. Relying on open-loop operation or disabling the controller defeats the purpose of feedback control. So the aim is to choose P, I, and D gains to achieve stable, responsive control without overshoot or oscillations.