FLOW METER

• US 20110154911A1
• Filed: 11/09/2010
• Published: 06/30/2011
• Est. Priority Date: 12/31/2009
• Status: Active Grant

• Current Assignee: STMicroelectronics Shenzhen R&D Co Ltd (STMicroelectronics NV)
• Original Assignee: STMicroelectronics Shenzhen R&D Co Ltd (STMicroelectronics NV)
• Inventors: Ge, Henry
• Granted Patent: US 8,590,395 B2
• Time in Patent Office: Days
• US Class Current: 73/861.11
• CPC Class Codes: G01F 1/28 by drag-force, e.g. vane type or impact flowmeter

Abstract

A flow meter for measurement of a metered fluid has a sensor element that receives a flow input of a metered fluid and outputs a flow output of the metered fluid, and a battery element. The sensor element has an inductor element and a magnetic element coupled to the inductor element. In response to movement of the magnetic element relative to the inductor element caused by a fluid pressure differential of the metered fluid, the inductive value of the inductor element changes.

Claims

1. A flow meter, comprising:

a sensor element that receives a flow input of a metered fluid and outputs a flow output of the metered fluid, wherein the sensor element comprises;

an inductor element;

a magnetic element coupled to the inductor element; and

a battery element that powers the flow meter;

wherein in response to movement of the magnetic element relative to the inductor element caused by a fluid pressure differential of the metered fluid, the inductive value of the inductor element of the sensor changes.

2. The flow meter of claim 1, further comprising:

a reference clock element coupled to the sensor element;

a clock element coupled to the inductor element;

a controller element coupled to the reference clock element and the clock element;

wherein in response to movement of the magnetic element relative to the inductor element caused by a fluid pressure differential of the metered fluid, the inductive value of the inductor element of the sensor changes and the controller element calculates a changed frequency of the clock element based upon the reference clock element and the changed inductive value of the inductor element caused by movement of the magnetic element relative to the inductor element and wherein the changed frequency of the clock element is representative of a volume of liquid consumption value of the metered fluid measured by the flow meter.

3. The flow meter of claim 2, wherein the reference clock element and the clock element are coupled to the controller element by first and second serial computer buses and wherein the controller element communicates the volume of liquid consumption value of the metered fluid via a serial peripheral interface.

4. The flow meter of claim 3, wherein the first and second serial buses are inter-integrated circuit (IIC) buses.

5. The flow meter of claim 2, wherein the flow meter further comprises:

a transmitter element controlled by the controller element; and

an interrupt request feature of the reference clock element,

wherein the interrupt request feature of the reference clock element causes the controller element to control the transmitter element of the flow meter to transmit the volume of liquid consumption value of the metered fluid.

6. The flow meter of claim 5, wherein the transmitter element is a radio frequency (RF) transmitter element.

7. The flow meter of claim 5, wherein the interrupt request feature of the reference clock element causes the controller element to control the transmitter element to transmit the volume of liquid consumption value of the metered fluid at predetermined intervals of time.

8. The flow meter of claim 7, wherein the transmitter element and the controller element go into a standby mode upon receipt of a confirmation message by the transmitter element that the consumption value of the metered fluid is received.

9. The flow meter of claim 2, the flow meter further comprising a display element coupled to the controller element, wherein the consumption value of the metered fluid is displayed on the display element of the flow meter.

10. The flow meter of claim 9, wherein the display element is a liquid crystal display.

11. The flow meter of claim 2, wherein the inductor element is coupled in series with the clock element.

12. The flow meter of claim 2, wherein the controller element is a microcontroller element.

13. The flow meter of claim 1, wherein the magnetic element is a magnetic cone element.

14. The flow meter of claim 1, wherein the fluid pressure differential of the metered fluid that causes movement of the magnetic element exists between an input side of the magnetic element and an output side of the magnetic element.

15. The flow meter of claim 1, wherein the metered fluid is one of gas and water.

16. A method of measuring consumption of a fluid, comprising:

receiving a fluid flow of a metered fluid at an input side of a magnetic element of a sensor element of a flow meter;

moving the magnetic element along an axis of the magnetic element relative to an inductor element of the sensor element in accordance with a fluid pressure differential that exists between the input side and an output side of the magnetic element, wherein moving the magnetic element relative to the inductive element changes the inductive value of the inductor element and a frequency of a clock element coupled to the inductive element;

calculating the changed frequency of the clock element based upon a reference clock element and the changed inductive value of the inductor element;

determining a volume of liquid consumption value of the metered fluid measured by the flow meter using the changed frequency of the clock element; and

communicating the volume of liquid consumption value.

17. The method of claim 16, wherein communicating the volume of liquid consumption value comprises displaying the volume of liquid consumption value on a display element of the flow meter.

18. The method of claim 16, wherein communicating the volume of liquid consumption value comprises transmitting the volume of liquid consumption value to a data reader external the flow meter.

19. The method of claim 18, wherein transmitting the volume of liquid consumption value to a data reader external the flow meter is controlled by an interrupt request signal of the reference clock element.

20. The method of claim 16, wherein communicating the volume of liquid consumption value further comprises:

the reference clock element generating an interrupt request signal;

a controller element of the flow meter receiving the interrupt request signal; and

the controller element controlling a transmit element to transmit the volume of liquid consumption value to a data reader external the flow meter.

21. The method of claim 20, further comprising the reference clock element generating the interrupt request signal periodically.