In a control system, what does increasing the integral action typically do?

• A. Decreases speed of response
• B. Eliminates steady-state error
• C. Reduces overshoot
• D. Increases stability

Answer: (B)

Increasing the integral action in a control system primarily functions to eliminate steady-state error. The integral component of a controller continuously sums the error over time, which allows it to respond to accumulated past errors. When the system output does not reach the desired setpoint, the integral action accumulates this error, increasing control output until the steady-state error is corrected.

This accumulation effectively ensures that even small discrepancies between the desired and actual outputs can be addressed over time, driving the error towards zero. By enhancing the controller's response to persistent errors, it becomes highly effective at eliminating steady-state error, thus improving system performance in achieving and maintaining the target state.

While increasing integral action can indeed have effects on speed of response, overshoot, and stability, these outcomes are secondary to the primary goal of eliminating steady-state error. Thus, the correct answer highlights the fundamental role of integral action within control systems.