Technical note: On the actuator rate limit effect in reaction curves.

Area of Science:

• Control Engineering
• System Dynamics
• Process Identification

Background:

• Actuator rate limitations are prevalent in practical engineering systems.
• The impact of rate limits on control synthesis and system identification is often underestimated.
• First-order plus time-delay (FOPTD) systems are common in various industrial applications.

Purpose of the Study:

• To develop a novel identification framework for FOPTD systems incorporating actuator rate limits.
• To analyze the influence of rate limits on system identification accuracy and control performance.
• To demonstrate the effectiveness of the proposed identification approach.

Main Methods:

• Developing a new identification framework specifically for FOPTD systems with actuator rate limits.
• Conducting quantitative analyses to validate the effects of rate-induced delays on parameter estimation.
• Utilizing illustrative examples and experimental data for validation.

Main Results:

• Actuator rate limits can introduce illusory delays in system response curves.
• Inaccurate delay estimation significantly affects the accuracy of other identified parameters.
• The proposed model structure effectively mitigates the adverse effects of rate limits on control performance.

Conclusions:

• Actuator rate limits pose a significant challenge to accurate system identification.
• The proposed identification framework improves the robustness and accuracy of FOPTD system models.
• Addressing rate limits is crucial for enhancing overall control system performance.