Process control apparatus.

摘要

A process control apparatus wherein dynamic characteristics of a process are identified in accordance with process inputs (u(t)) and outputs (y(t)), so as to tune digital PID parameters (Kc, Ti, Td) in accordance with the identified dynamic characteristics (G(z-1)). The process (10) is an N-input/output process having an interference between the process inputs (u(t)) and outputs (y(t)). Each transfer function (G(z-1)) between a given process input and process output is identified. A transfer function (Gp(s)) between a set-point signal (r(t)) and the process output (y(t)) is obtained and matched with that of an N-input/output decoupled reference model, to tune the PID parameters (Kc, Ti, Td).