INDUSTRIAL PROCESS CONTROLLER AND METHOD OF PROCESS CONTROL

摘要

An industrial process controller (20, 80', 110), and methods of controlling an industrial process, are provided for controlling a process variable responsive to a set point. The industrial process controller (20, 80', 110) has a differentiator (26, 26') for determining a difference signal (28, 28') between a process variable (24, 24') and a set point (25, 25'). A timing synchronizer is operatively connected to the differentiator (26, 26') for generating a synchronized timing reference signal (22, 22') responsive to the difference signal (28). A feedforward controller (23, 23') is operatively connected to the differentiator (26, 26') and the timing synchronizer for generating a lead/lag feedforward signal responsive to the difference signal (28, 28') and the synchronized timing reference signal (22, 22'). A proportional and derivative controller (31, 31') is operatively connected to the differentiator (26, 26') and the timing synchronizer for generating an output signal responsive to the difference signal (28, 28'). The proportional and derivative controller (31, 31') has a generator for generating a proportional signal and a derivative signal. A summer (33, 33') combines the output signal of the proportional and derivative controller with the feedforward signal to thereby generate a command signal (34, 34') for the process variable. A feedforward characterizer is operatively connected to the proportional and derivative controller and the summer for providing thereto a characterized feedforward control signal based upon the command signal to thereby control an overall gain between the process variable and the set point of the industrial process (38, 38').