The Cohen-Coon autotuning method is an offline method for tuning PID controllers. This method uses PID parameters obtained from an open-loop transfer function experiment. This method is similar to the Ziegler-Nichols method, but provides better results when the controller has a large deadtime Td relative to the time constant T.

注： You must use the PID Autotuning Design VI to implement this autotuning method.

The following table shows the Cohen-Coon recommendations for tuning parameters under different tuning specifications:

Controller Kc Ti Td
P — —
PI —
PID

Where T is the time constant

Kc is the proportional gain

Td is the deadtime