Optimized method for controlling position and crossover pressure in double acting actuator

Abstract

Systems and methods may be provided to digitally control both position and crossover pressure in a double-acting pneumatic actuator, in view of constraints (e.g., a deadband range comprising a set point) set on the crossover pressure. Control may be achieved, via a control algorithm (e.g., a Multiple Input Multiple Output (MIMO) control algorithm) acting upon inputs of actuator position feedback and crossover pressure feedback (e.g., as indicated by pressure feedback of each respective pneumatic chamber). Further, the embodiment described herein may reduce the necessary frequency of control actions for adjusting crossover pressure, thus reducing wear on process components, and allowing for finer control of actuator position.

Description

technical field [0001] The present disclosure relates generally to control valves, and more particularly to control methods and systems for controlling double-acting pneumatic actuators acting on control valves. Background technique [0002] Many industrial process control systems use control valves to control the flow rate of process fluids through pipelines. Traditionally, control valves can be opened and closed via actuators, where the position of the actuator can be set based on a positioning signal set by the positioner based on process settings, feedback from the actuator position sensor, and / or Other inputs are generated. In some process environments, the actuator may be a double-acting pneumatic actuator comprising two pneumatic chambers, where a differential pressure of pneumatic fluid supplied to each chamber bidirectionally pushes a piston connected to a valve stem. The stem in turn translates the movement of the piston to adjust the opening of the control valve...

AI Technical Summary

Problems solved by technology

However, such an approach can be time-consuming, imprecise, and waste pneumatic fluid

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