TIRE HAVING WIRELESS MICRO AND NANO SENSORS

• US 20090277262A1
• Filed: 07/13/2009
• Published: 11/12/2009
• Est. Priority Date: 04/25/2006
• Status: Active Grant

• Current Assignee: Bridgestone Firestone North American Tire LLC (Bridgestone Corporation)
• Original Assignee: Bridgestone Firestone North American Tire LLC (Bridgestone Corporation)
• Inventors: MERAT, FRANCIS L., RENSEL, JOHN D., WILSON, PAUL B.
• Granted Patent: US 7,832,263 B2
• Time in Patent Office: Days
• US Class Current: 73/146
• CPC Class Codes: B60C 11/24 Wear-indicating arrangements
• CPC Class Codes: B60C 11/246 Tread wear monitoring systems
• CPC Class Codes: B60C 19/00 Tyre parts or constructions not otherwise provided for
• CPC Class Codes: B60C 23/0493 for attachment on the tyre
• CPC Class Codes: B60C 23/20 Devices for measuring or signalling tyre temperature only
• CPC Class Codes: B60G 17/019 characterised by the type of sensor or the arrangement thereof B60G17/01941 takes precedence
• CPC Class Codes: B60G 2204/113 Tyre related sensors
• CPC Class Codes: B60G 2400/52 in tyre
• CPC Class Codes: B60G 2800/984 Tyre Pressure Monitoring Systems
• CPC Class Codes: B60T 2240/03 Tire sensors

Abstract

A sensor system for obtaining data from an elastomeric article includes at least one wireless sensor. The sensor length-scales range from nano- to micro-scale devices that are small enough to avoid becoming occlusions within the article. The article may include sensors embedded within one of the materials of the article, a layer of sensors built into the article, and a string of sensors disposed within a component or embedded within a component of the article. The sensors may be configured to provide data related to one or more of temperature, pressure, sidewall flex, stress, strain and other parameters. The sensors may be LCD sensors, and/or conductive polymer sensors, and/or bio-polymer sensors and/or polymer diodes suitable for sensing data during the operation of the tire. A power circuit using energy generated by the tire may provide power to the sensors.

Claims

1. A pneumatic tire comprising:

a pair of bead rings;

a body cord ply extending between the bead rings;

an innerliner disposed inwardly of the body cord ply;

a belt layer disposed outwardly of the body cord ply;

a pair of sidewalls disposed outwardly of the body cord ply; and

a sensor layer including a plurality of micro-scale sized or smaller sensors each providing wireless signal data related to one or more physical properties of the tire.

2. The tire of claim 1, wherein the sensor layer is embedded within the body cord ply or disposed adjacent the body cord ply between the body cord ply and the innerliner or is disposed adjacent the body cord ply between the body cord ply and the sidewalls or is disposed adjacent the body cord ply between the body cord ply and the belt layer or is disposed outwardly of the belt layer or is embedded within the innerliner.

3. The tire of claim 1, wherein the belt layer has a pair of ends, the sensor layer being disposed adjacent to one of the ends of the belt layer.

4. The tire of claim 1, wherein the sensors are sufficiently small to avoid being an occlusion in the tire.

5. The tire of claim 1, wherein the sensor layer includes sensors adapted to provide data about at least one physical property of the tire including temperature, stress, strain, shear, vibration, or chemistry.

6. The tire of claim 5 wherein the sensor layer includes stress and strain sensors disposed adjacent the body cord ply and the sidewalls.

7. The tire of claim 1, wherein the sensor layer has a circuit formed of conductive inks on an elastomeric or plastic substrate.

8. The tire of claim 1, wherein the plurality of sensors includes a large number of sensors each providing a wireless signal providing a physical property of the tire.

9. The tire of claim 1, wherein the sensor layer comprises a mesh of sensors having openings allowing tire materials adjacent the layer to extend through the layer.

10. The tire of claim 1, wherein the sensor layer comprises an array of sensors one sensor thick.

11. The tire of claim 1, wherein the sensor layer comprises an array of sensors multiple sensors thick.

12. The tire of claim 1, wherein the sensors are randomly distributed throughout the sensor layer.

13. A pneumatic tire comprising:

a pair of bead rings;

a body cord ply extending between the bead rings, the body cord ply having a plurality of body cords encased in a body cord ply material;

an innerliner disposed inwardly of the body cord ply;

a belt layer disposed outwardly of the body cord ply;

the belt layer having a plurality of cords encased in a belt layer material;

a pair of sidewalls disposed outwardly of the body cord ply;

the sidewalls being fabricated from a sidewall material; and

a plurality of micro-scale sized or smaller sensors providing wireless signals providing data related to at least one physical property of the tire, the sensors embedded in at least one of the body cord ply material, the belt layer material, and the sidewall material, each sensor having a size similar to carbon black or smaller thereby being sufficiently small enough to avoid being an occlusion.

15. The tire of claim 13, wherein the sensors are randomly distributed.

16. The tire of claim 13, wherein the embedded sensors are cured within the tire.

17. The tire of claim 13, wherein the sensors are one of an LCD sensor, a conductive polymer sensor, a bio-polymer sensor, and a polymer diode.

18. The tire of claim 13 having a tread including a useful tread thickness, wherein the plurality of sensors include a large number of sensors distributed throughout the useful tread thickness, each sensor providing a signal.

19. The tire of claim 18, further comprising a signal collection device sampling the sensors wireless signals for creating a map of the tire structure.

20. The tire of claim 19, wherein the signal collection device counts the sensors in different regions of the tread thereby localizing the sensors remaining in the tread for determining tread wear.