CUT-OFF TRANSITION FOR CONTROL VALVE POSITIONERS

摘要

The present invention includes a method, apparatus, and computer readable medium for controlling a valve. Example embodiments of the present invention described herein utilize a soft cutoff threshold and soft cutoff procedure at which point the controller monotonically ramps a servo set-point to slowly overdrive the servo beyond a calibrated set- point range, wherein the servo transitions into a hard cutoff when the servo set-point reaches a predefined overdrive threshold.