PURPOSE: To accurately identify the process feature quantity regardless of superposition of noise on the response waveform of a process at the time of calculating the process feature quantity.
CONSTITUTION: A process control system including a PID control loop is provided with a PID controller which automatically determines parameters of control system elements P, I, and D at the time of applying the stepwise set value change from a target value signal generating part. A feature quantity calculating part 103 which identifies the feature quantity of a close loop transfer function including the PID controller 102 and a control object 101, a transfer function identifying part 105 which identifies the control object transfer function based on the identified feature quantity, and a PID constant calculating part 104 which determines respective parameters of P, I, and D operations based on the identified close loop transfer function are provided, and the feature quantity calculating part 103 applies an FFT operation part and a neural network model to calculate an angular frequency ωo and an attenuation rate ζwhen using the time series of the measured value for the set value change to identify the feature quantity.
TADOKORO HIDEYUKI
YODA MIKIO
