Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and apparatus for controlling the valve position of a variable orifice flow meter

A variable, controller technology used in applications such as flow control using electrical devices, flow control, control/regulation systems, etc.

Inactive Publication Date: 2007-02-07
RIVATEK
View PDF0 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] A drawback of using feedforward disturbance correction is that the feedforward signal is only a correction signal

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for controlling the valve position of a variable orifice flow meter
  • Method and apparatus for controlling the valve position of a variable orifice flow meter
  • Method and apparatus for controlling the valve position of a variable orifice flow meter

Examples

Experimental program
Comparison scheme
Effect test

other Embodiment approach

[0058] Examples of other embodiments may use a single differential pressure sensor that reads pressure values ​​from the inlet and outlet sides of the orifice of the device and determines the differential pressure across the orifice. This and other types of sensors need not be mounted on sensor holes, nor need the sensor holes used have a larger cross-sectional area than the pipe. For example, the sensor can be configured to take pressure readings using a small probe that requires a very small opening into the pipe compared to the size of the pipe, and the sensor can be mounted within the equipment enclosure or a different location adjacent to the equipment enclosure. Location.

[0059] However, further embodiments may not include any sensors directly associated with the device, but instead may be configured to use pressure signals provided by an external source. Such pressure readings from external sources may include, for example, pressure readings from pressure sensors loc...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A device for metering fluid flow is disclosed. The device includes a variable sized orifice defined by a fluid flow conduit and an element movable relative to the fluid flow conduit to vary a size of the orifice, a pressure sensor configured to determine a pressure differential across the orifice and generate a pressure signal, a positioning device configured to determine a position of the element relative to the conduit and generate a position signal, and a processor configured to determine the fluid flow rate using the pressure signal and the position signal. The system can directly control the adjustable valve or orifice. Alternatively, the system can move back and forth between a direct mode and a PID mode. When in a PID mode, the system employs a standard PID algorithm with a variable gain term. The system switches to direct mode when it is advantageous for the controller to directly change the valve position based upon the setpoint, and the input and output pressures.

Description

technical field [0001] This invention relates generally to fluid flow metering and fluid control systems; more particularly to improving the response time of flow control loops and systems; and more particularly to improving the control response to flow set point changes, and the operation of control loops Control response to changes in conditions (loop pressure). Background technique [0002] In a flow control system, the valve can be controlled by an intelligent controller or other CPU-based device such as a personal computer. The controller device typically implements some form of PID (Proportional, Integral, Derivative) algorithm for flow control. As an input to a control loop, a flow meter often provides the flow rate. The controller continuously monitors the flow rate and compares it to a desired flow rate (eg, a set point). The difference between the actual flow rate and the set point is commonly referred to as the error term. The signal generated by the controlle...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G05D7/06
CPCG05D7/0635
Inventor 格兰特·布雷德利·爱德华兹约翰·艾伦·基尔布代尔·艾伦·纽金特
Owner RIVATEK