| 摘要 |
PURPOSE:To set optimum control parameters at optimum timing and to perform optimum process control speedily by providing a process identification part, identification end decision part, and parameter arithmetic part which calculates control parameters for a process-controlled system and sets those control parameters in a main control part. CONSTITUTION:The process identification part 6 inputs an operation signal (g) on which an identification signal is superposed and a control signal (m) at a specific sampling period. The identification end decision part 10 monitors variations of values of coefficients G0 and G1 of a transfer function G(s) which is obtained by the process identification part 6 successively and calculates the rate A of variation of G0 with time. Then, the rate B of variation of the coeffi cient Gd1 with time is calculated. The identification end decision part 10 when deciding that the identification is made sends out identification end signals E and E' to close a switch SW for setting. A PID parameter calculation part 11 calculates PID parameters according to the current transfer function G(s) which is obtained by the process identification part 6 and sends them out to a PID control part 2 through the switch SW for setting. |
