CohenCoonVerfahren

The Cohen-Coon Verfahren, also known simply as Cohen-Coon tuning, is a widely recognized method for the initial tuning of Proportional-Integral-Derivative (PID) controllers. Developed by G. H. Cohen and G. A. Coon in 1953, this empirical approach provides approximate controller parameters based on the process reaction curve, which is obtained by applying a step change to the process and observing its response.

The method relies on analyzing the process's open-loop step response to determine key characteristics such as the process gain, dead time, and time constant. Using these parameters, Cohen and Coon derived formulas to calculate the proportional, integral, and derivative control settings aimed at achieving a balance between stability, responsiveness, and minimal overshoot. The technique is particularly useful in industrial control systems where a quick and straightforward initial tuning is necessary.

The Cohen-Coon method is classified as a tuning technique that emphasizes the importance of process dynamics, making it suitable for processes with significant dead time and slow response. It serves as a starting point for further fine-tuning, often complemented with other tuning rules or iterative adjustments based on real-time system performance.

While the Cohen-Coon approach offers simplicity and practical utility, it is mainly applicable to processes with consistent and predictable dynamics. Variations in process behavior may require adjustments or alternative tuning methods. Overall, the Cohen-Coon Verfahren remains a foundational technique in control engineering for establishing initial PID controller settings in various industrial applications.