Which control strategy is characterized by a constant error correction?

The control strategy characterized by constant error correction is Integral Control. This strategy focuses on the accumulation of past errors over time, which allows the controller to address any persistent offset between the setpoint and the process variable. As the controller develops an integral of the error, it continuously adjusts the output to eliminate steady-state errors, meaning it actively seeks to bring the system to the target setpoint without deviation.

Integral Control is essential in systems where steady-state error needs to be minimized or eliminated, as it responds to both the magnitude of the error and the duration for which the error persists. By integrating the error over time, it gradually adjusts the control output, ensuring that even small, consistent errors are corrected. This is particularly effective in maintaining system stability and accuracy in the long term.

In contrast, Proportional Control reacts to the current error but does not address accumulated past errors, potentially leading to a steady-state error. Derivative Control predicts future errors based on the rate of change, and Predictive Control uses models of future behavior to make adjustments, rather than focusing on constant error correction.