On-line retuning of PID controllers with fixed threshold samplers

Area of Science:

• Control Systems Engineering
• Signal Processing
• Automation

Background:

• Limit cycle oscillations in control systems with fixed threshold samplers degrade performance.
• These oscillations cause actuator wear and increase communication overhead in distributed systems.

Purpose of the Study:

• To analyze the role of input signals in limit cycle generation.
• To develop a methodology for re-tuning PID controllers to avoid these oscillations.
• To provide practical implementation guidelines and examples.

Main Methods:

• Analysis of limit cycle existence considering input signal characteristics.
• Development of an online re-tuning methodology for PID controllers.
• Validation through implementation guidelines and illustrative examples.

Main Results:

• A method to avoid limit cycle oscillations induced by ramp-like signals is presented.
• The methodology allows for real-time re-tuning of PID controllers.
• The approach effectively mitigates performance degradation and actuator wear.

Conclusions:

• Input signal analysis is crucial for understanding limit cycle phenomena.
• The proposed PID controller re-tuning method offers a practical solution to avoid oscillations.
• This work contributes to improved stability and efficiency in control systems.