Patent ID: 6745084
Filing Date: 2004-06-01
Classification: F15B,G05B

Abstract:
In a pneumatically controllable valve responsive to electronic positioning signals to a current-to-pressure (I/P) transducer, a self-tuning method for improving valve position response, the method comprising:finding a BIAS value to the I/P transducer to place the valve in a predetermined position, wherein the predetermined position is a position in which an actuator associated with the valve neither fills nor exhausts; performing an open-loop tuning test on the valve by using the found BIAS value for obtaining at least one control parameter used in a position control routine, wherein the at least one control parameter is used to control valve positioning in response to a position set point command signal; and performing a closed loop tuning test to tune the at least one control parameter to achieve an improved dynamic response of the valve in both opening and closing valve movement directions.