Tire sensing method for enhanced safety and controllability of vehicles

• US 9,815,343 B1
• Filed: 06/08/2015
• Issued: 11/14/2017
• Est. Priority Date: 06/06/2014
• Status: Active Grant

• Current Assignee: Iowa State University Research Foundation Incorporated (Iowa State University)
• Original Assignee: Iowa State University Research Foundation Incorporated (Iowa State University)
• Inventors: Laflamme, Simon, Geiger, Randall L.
• Primary Examiner(s): Caputo, Lisa
• Assistant Examiner(s): Cotey, Philip
• Application Number:
  US14/733,640
• Time in Patent Office: 890 Days
• Field of Search: 73146, 731462
• CPC Class Codes: B60C 2019/004 Tyre sensors other than for detecting tyre pressure
• CPC Class Codes: B60C 23/064 comprising tyre mounted deformation sensors, e.g. to determine road contact area
• CPC Class Codes: B60C 5/00 Inflatable pneumatic tyres or inner tubes B60C1/00, B60C9/00 - B60C17/00 take precedence

Abstract

A method for tire sensing includes providing a tire comprising (a) a tire body having an outer wall for contact with a surface and opposite side walls, and an inside surface and (b) at least one flexible strain gauge positioned along the inside surface of the tire body, wherein the at least one flexible strain gauge is positioned to sense tire deflections or strain. The method further includes sensing tire data indicate of the tire deflections using the at least one flexible strain gauge and communicating the tire data to a data acquisition system, control system, or computer system. The flexible strain gauge(s) may be soft dielectric capacitive sensors, soft resistive sensors, or soft capacitive/resistive sensors.

Claims

1. An apparatus for sensing or monitoring one or more tire parameters related to tire deformation comprising;

a deformable tire body having an outer wall for contact with a surface, opposite side walls, and an inside;

at least one flexible sensing assembly positioned across an area on the inside of the tire body, wherein the at least one flexible sensing assembly is positioned to sense tire deformation at the area and produce sensor data;

the flexible sensing assembly comprising a soft dielectric capacitor, soft resistor, or combined soft capacitor and resistor sensing assembly structure comprising;

(1) a bonding layer disposed to bond the sensing assembly structure to the area on the inside of the tire body without affecting compliancy of the sensing assembly with deformation of the tire at the area;

(2) a compliant dielectric layer comprising a soft, elastic dielectric material having a first surface and a second surface and which is compliant with deformation of the tire at the area, and

a thickness defined between the first surface and the second surface, a deformation of the soft dielectric material producing a change in capacitance and/or resistance, and

(3) electrodes disposed in opposition on the first and second surfaces of the soft dielectric material, wherein the electrodes are configured to operate in conjunction with the compliancy of the soft dielectric material;

a communications interface operatively connected with the flexible sensing assembly to communicate signals representative of capacitance and/or resistance from which the parameters related to tire deformation can be derived.

2. The apparatus of claim 1 wherein the at least one flexible sensing assembly comprises a Flexible Electronic Sensor.

3. The apparatus of claim 2 wherein the Flexible Electronic Sensor comprises a soft dielectric capacitor, a soft resistor, or a soft resistor/capacitor.

4. The apparatus of claim 1 further comprising an instrumentation interface circuit operatively connected to at least one flexible sensing assembly.

5. The apparatus of claim 1 further comprising a control circuit operatively connected to the at least one flexible sensing assembly.

6. A vehicle comprising at least one of the apparatus of claim 1.

7. The apparatus of claim 1 wherein the communications interface is a wireless interface.

8. A method for tire deformation sensing comprising:

(a) providing a deformable tire body having an outer wall for contact with a surface;

(b) bonding to the area of the tire body at least one flexible sensing assembly without affecting compliancy of the sensing assembly with deformation of the tire at the area, wherein the at least one flexible sensing assembly is positioned to sense tire deformation at the area by a soft, elastic dielectric capacitor, soft resistor, or combined soft capacitor and resistor which is compliant with deformation of the tire at the area, and at least a pair of electrodes configured to operate in conjunction with the compliancy of the soft dielectric capacitor, soft resistor, or combined soft capacitor and resistor;

(c) sensing a change in capacitance and/or resistance of the flexible sensing assembly at the area of the tire;

(d) converting the sensed change in capacitance and/or resistance into tire sensory data and transmitting/communicating the tire sensory data to a data acquisition system, control system, or computer system for correlating the sensory data with parameters related to tire deformation.

9. The method of claim 8 further comprising performing an analysis of the tire sensory data by the data acquisition system, control system, or computer system.

10. The method of claim 9 further comprising generating feedback to an operator of a vehicle associated with the tire based on the analysis.

11. The method of claim 9 wherein the analysis comprises a tire degradation analysis based on correlating the tire sensory data to tire degradation.

12. The method of claim 9 wherein the analysis comprises a slippage analysis based on correlating the tire sensory data to a tire slippage.

13. The method of claim 9 wherein the analysis comprises a tire contact analysis based on correlating the tire sensory data to a tire contact.

14. The method of claim 9 wherein the analysis comprises a tire force analysis based on correlating the tire sensory data to tire force.

15. The method of claim 9 wherein the analysis comprises a pressure analysis based on correlating the tire sensory data to tire pressure.

16. The method of claim 9 wherein the analysis comprises a terrain analysis based on correlating the tire sensory data to terrain.

17. The method of claim 9 further comprising adjusting vehicle control parameters based on the analysis.

18. The method of claim 9 wherein the tire data is indicative of a puncture of the tire.

19. The method of claim 9 wherein the tire sensory data is indicative of a low pressure condition.

20. The method of claim 9 wherein the communicating the tire sensory data to the control system is performed using a wireless transceiver.

21. The method of claim 8 wherein each of the at least one flexible sensing assembly comprise a soft dielectric capacitive sensor, a soft resistive sensor, or a soft resistive/capacitive sensor.

22. A system for smart tire sensing comprising:

(a) a deformable tire body having an outer wall for contact with a surface, opposite side walls, and an inside;

(b) an array of flexible sensing assemblies positioned across one or more areas on the tire body to sense tire deformation at the areas, each said flexible sensing assembly comprising a soft dielectric capacitor, soft resistor, or soft combined capacitor and resistor sensing assembly structure comprising;

(1) a bonding layer disposed to bond the sensing assembly structure to the tire body without affecting compliancy of the sensing assembly with deformation of the tire at the area;

(2) a compliant dielectric layer comprising a soft, elastic dielectric material having a first surface and a second surface and which is compliant with deformation of the tire at the area,

(3) a thickness defined between the first surface and the second surface, a deformation of the soft dielectric material producing a change in capacitance or resistance, and

(4) electrodes disposed in opposition on the first and second surfaces of the soft dielectric material, wherein the electrodes are configured to operate in conjunction with the compliancy of the soft dielectric material; and

(c) a communication system for converting the change in capacitance or resistance to tire sensory data and transmitting/communicating the tire sensory data to a data acquisition system, control system, or computer system for correlation to one or more parameters related to tire deformation.