Illinois Tool Works Inc.

Jeffrey Whiteley

John Michael Lull

Berwin Banares

A valve control system that includes a gain controller for controlling the linear response of a valve. The system includes a linearization control system coupled to the gain controller to determine a gain value to control the linear response time of the valve and a set point filter coupled to the linearization control system to filter a set point value. The linearization control system determines the gain value from the filtered set point value, at least one real-time fluid parameter value, valve model data, an actuator gain, and a valve model gain.

Mass flow valve controller and control method with set point filter and linearization system based on valve model

A mass flow controller that includes a linearization system to control the linear response of a valve in order to control the gain of the mass flow controller. The linearization system includes a flow modeling system for processing at least one of a fluid type, a flow rate, a pressure, and a temperature value signal relating to flow of the fluid through a flow path and determining fluid properties. The linearization system also includes a valve modeling system to determine the required operational characteristics of the valve according to valve specifications, a desired flow rate, and the determined fluid properties. The linearization system determines a gain to control the lift of the valve in order to acquire a desired fluid flow rate. The gain is determined by calculating the derivative of predicted lift with respect to fluid flow and the derivative of drive with respect to predicted lift.

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Glenview, IL, United States of America

Jeffrey Whiteley