MEASURING TYRE PRESSURE

• US 20100269576A1
• Filed: 12/17/2008
• Published: 10/28/2010
• Est. Priority Date: 12/17/2007
• Status: Active Grant

• Current Assignee: Silent Sensors Limited
• Original Assignee: Opus Project Management Limited
• Inventors: Ingram, Jonathan Francis Gordon
• Granted Patent: US 8,291,756 B2
• Time in Patent Office: Days
• US Class Current: 73/146.800
• CPC Class Codes: B60C 23/0452 Antenna structure, control or arrangement vehicle tyre mounted antennas H01Q1/2241
• CPC Class Codes: B60C 23/0494 Valve stem attachments positioned inside the tyre chamber
• CPC Class Codes: B60C 23/0496 Valve stem attachments positioned outside of the tyre chamber

Abstract

This invention provides a valve stem (21) for a tyre. The valve stem (21) comprises at least one electrical circuit for measuring pressure within the tyre. The circuit comprises a capacitive pressure sensor (5) and an inductive coil (6). The inductive coil (6) is coiled around the valve stem (21).

Claims

1. A valve stem for a tyre comprising at least one electrical circuit for measuring pressure within the tyre, the circuit comprising:

a capacitive pressure sensor; and

an inductive coil,

wherein the inductive coil is coiled around the valve stem.

2. A valve stem as claimed in claim 1, wherein the valve stem comprises a first portion removably joined to a second portion, and wherein the first portion comprises the electrical circuit and the second portion is connected to the tyre, in use.

3. A valve stem as claimed in claim 2, wherein the first portion is a dust cap.

4. A valve stem as claimed in claim 1, wherein the valve stem comprises a recess suitable for containing the inductive coil.

5. A valve stem as claimed in claim 1, wherein the inductive coil is located on the outer surface of the valve stem.

6. A valve stem as claimed in claim 1, further comprising at least one electrical circuit for measuring temperature.

7. A valve stem as claimed in claim 2, wherein the valve stem comprises a recess suitable for containing the inductive coil.

8. A valve stem as claimed in claim 2, wherein the inductive coil is located on the outer surface of the valve stem.

9. A valve stem as claimed in claim 2, further comprising at least one electrical circuit for measuring temperature.

10. A valve stem as claimed in claim 3, wherein the valve stem comprises a recess suitable for containing the inductive coil.

11. A valve stem as claimed in claim 3, wherein the inductive coil is located on the outer surface of the valve stem.

12. A valve stem as claimed in claim 3, further comprising at least one electrical circuit for measuring temperature.

13. A valve stem as claimed in claim 4, wherein the inductive coil is located on the outer surface of the valve stem.

14. A valve stem as claimed in claim 4, further comprising at least one electrical circuit for measuring temperature.

15. A valve stem as claimed in claim 5, further comprising at least one electrical circuit for measuring temperature.