Systems and methods for validating a vortex fluid flow signal

Patent metadata

Field	Value
Publication number	US-11365992-B2
Application number	US-201916709002-A
Country	US
Kind code	B2
Filing date	Dec 10, 2019
Priority date	Dec 10, 2019
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

Vortex sensor amplitude information may be used to validate that a vortex signal being measured corresponds to an actual fluid flow and is not noise. The estimated amplitude of a sinusoidal vortex signal is used as a secondary means to determine the fluid flow based on vortex sensor characteristics. The original amplitude of the sinusoidal vortex signal is determined from a clipped voltage amplitude sinusoidal signal. The estimated velocity of the fluid in a pipe based on the original amplitude of the sinusoidal vortex signal is compared to the measured velocity of the fluid based on vortex velocity frequency. If the two determined velocities do not reasonably agree, the measured vortex signal is not a valid flow signal and adaptive filters are adjusted to reduce the effects of noise.

First claim

What is claimed is:

1. A method, comprising:
clipping a sinusoidal vortex signal to form a clipped voltage amplitude sinusoidal signal, which was generated by a vortex sensor excited by a fluid flowing past the vortex sensor in a pipe, the voltage amplitude of the clipped voltage amplitude sinusoidal signal being limited by a clipping circuit;
filtering the clipped voltage amplitude sinusoidal signal using a tracking band pass filter to minimize noise waveforms;
determining a measured velocity of the fluid flowing past the vortex sensor in the pipe, based on a measured vortex velocity frequency of the sinusoidal vortex signal generated by the vortex sensor, the fluid having a known density;
determining an estimated velocity of the fluid flowing past the vortex sensor in the pipe, based on an estimated amplitude of the sinusoidal vortex signal determined from the voltage amplitude of the clipped voltage amplitude sinusoidal signal and the density of the fluid;
comparing the measured velocity with the estimated velocity to determine whether to change the tracking band pass filter to improve accuracy of determining the measured velocity;
changing the tracking band pass filter in response to the comparing operation and repeating the filtering operation using a changed tracking band pass filter, the determining operations, and the comparing operation; and
determining an improved accuracy measured velocity of the fluid, using the changed tracking band pass filter, for output to a utilization device.

2. The method of claim 1 , further comprising:
receiving, by the tracking band pass filter, the sinusoidal vortex signal as the clipped voltage amplitude sinusoidal signal that was originally generated by the vortex sensor as an original sinusoidal vortex signal having an originally unclipped voltage amplitude before having been clipped, the clipped voltage amplitude sinusoidal signal retaining the vortex velocity frequency produced by the vortex sensor, the received clipped voltage amplitude sinusoidal signal being received combined with the noise waveforms;
wherein the measured velocity of the fluid is determined as a function of the retained vortex velocity frequency of the filtered, clipped voltage amplitude sinusoidal signal; and
wherein the estimated amplitude of the sinusoidal vortex signal is determined from the filtered, clipped voltage amplitude sinusoidal signal.

3. The method of claim 2 , further comprising:
measuring a period of the received clipped voltage amplitude sinusoidal signal;
setting a first trip point voltage and a second trip point voltage with a voltage difference value between the first trip point voltage and the second trip point voltage;
determining a time difference measured between when the received clipped voltage amplitude sinusoidal signal passes through the first trip point voltage and passes through the second trip point voltage;
determining an angle value as a product of pi times a ratio of the time difference to the measured period; and
determining the estimated amplitude of the sinusoidal vortex signal from a ratio of the voltage difference value and a value of two times the sine of the angle value.

4. The method of claim 3 wherein the comparing comprises:
determining whether the measured velocity based on the vortex velocity frequency located on an abscissa of a graph and the estimated velocity of the fluid based on the estimated amplitude located on an ordinate of the graph, intersect on a curve on the graph of a product of a density of the fluid times fluid velocity squared as the ordinate versus fluid velocity as the abscissa for the fluid flowing in the vortex sensor.

5. The method of claim 1 , further comprising:
controlling an actuator of a valve as the utilization device, configured to control a flow rate of a fluid flowing through the valve and through the vortex sensor, in response to a determined value of the fluid velocity.

6. The method of claim 1 , further comprising:
controlling a totalizer configured to count units of a fluid flowing through the vortex sensor, in response to the determined value of the fluid velocity.

7. The method of claim 6 , further comprising:
controlling an actuator of a valve to turn off the valve when the count of the units by the totalizer equals a predetermined quantity of units of the fluid flowing through the vortex sensor.

8. The method of claim 1 , wherein a determination of the estimated amplitude of the sinusoidal vortex signal includes compensating for variations in temperature, pressure, and viscosity of the fluid and vortex sensor characteristics.

9. An apparatus, comprising:
at least one processor;
at least one memory including computer program code, wherein the computer program code, when executed by operation of the at least one processor, performs an operation comprising:
clipping a sinusoidal vortex signal to form a clipped voltage amplitude sinusoidal signal, Which was generated by a vortex sensor excited by a fluid flowing past the vortex sensor in a pipe, the voltage amplitude of the clipped voltage amplitude sinusoidal signal being limited by a clipping circuit;
receiving, by a tracking band pass filter, the sinusoidal vortex signal as the clipped voltage amplitude sinusoidal signal that was originally generated by the vortex sensor as an original sinusoidal vortex signal having an originally unclipped voltage amplitude before having been clipped, the received clipped voltage amplitude sinusoidal signal being received combined with noise waveforms;
filtering the clipped voltage amplitude sinusoidal signal using the tracking band pass filter to minimize the noise waveforms;
measuring a period of the received clipped voltage amplitude sinusoidal signal;
setting a first trip point voltage and a second trip point voltage with a voltage difference value between the first trip point voltage and the second trip point voltage;
determining a time difference measured between when the received clipped voltage amplitude sinusoidal signal passes through the first trip point voltage and passes through the second trip point voltage;
determining an angle value as a product of pi times a ratio of the time difference to the measured period; and
determining an estimated amplitude of the sinusoidal vortex signal from a ratio of the voltage difference value and a value of two times the sine of the angle value;
determining a measured velocity of the fluid flowing past the vortex sensor in the pipe, based on a measured vortex velocity frequency of the sinusoidal vortex signal generated by the vortex sensor, the fluid having a known density;
determining an estimated velocity of the fluid flowing past the vortex sensor in the pipe, based on the estimated amplitude of the sinusoidal vortex signal determined from the clipped voltage amplitude sinusoidal signal and the density of the fluid;
comparing the measured velocity with the estimated velocity to determine whether to change the tracking band pass filter to improve accuracy of determining the measured velocity;
changing the tracking band pass filter in response to the comparing operation and repeating the filtering operation using a changed tracking band pass filter, the determining operations, and the comparing operation; and
determining an improved accuracy measured velocity of the fluid, using the changed tracking band pass filter, for output to a utilization device.

10. The apparatus of claim 9 , further comprising:
wherein the clipped voltage amplitude sinusoidal signal retains the vortex velocity frequency produced by the vortex sensor, the received clipped voltage amplitude sinusoidal signal being received combined with the noise waveforms;
wherein th

Assignees

• Schneider Electric Systems Usa Inc

Inventors

• Allstrom Peter E
• Dorr Timothy

Classifications

• G05D7/0635 Primary

  by action on throttling means (G05D7/0688, G05D7/0694 take precedence) · CPC title

• G01F1/3259

  for detecting fluid pressure oscillations · CPC title

• G01F1/32 Primary

  using swirl flowmeters · CPC title

• G01F1/3209

  using Karman vortices · CPC title

• G01F1/3287

  circuits therefor · CPC title