Patent ID: 8321060
Filing Date: 2012-11-27
Classification: G05D

Abstract:
1. A method of obtaining an initial adjusted mass flow controller valve start position comprising, obtaining a mass flow controller delay period comprising a period of time between initiation of a mass flow controller application and initiation of flow through the mass flow controller; setting a valve to an initial valve opening position; inputting an initial desired flow rate and initial operating conditions into a control system in communication with the valve; initiating control system execution for the initial valve opening position and the initial operating conditions, the control system being adapted to adjust the valve opening position according to the initial desired flow rate and control system feedback; recording the valve position and the flow rate during at least a portion of the control system execution; detecting a flow rate that one of meets and exceeds a threshold; determining an initial-flow time-period extending from the control system initiation execution to detection of the threshold being one of met and exceeded; subtracting the mass flow controller delay period from the initial flow time period to obtain an adjusted start time; determining the valve opening position at the adjusted start time; and establishing the valve opening position at the adjusted start time as the initial adjusted mass flow controller valve start position so as to enable at least one of quicker flow and decreased desired flow rate overshoot.