MODEL-BASED LONGITUDINAL STIFFNESS ESTIMATION SYSTEM AND METHOD

• US 20150285712A1
• Filed: 04/03/2014
• Published: 10/08/2015
• Est. Priority Date: 04/03/2014
• Status: Active Grant

• Current Assignee: Goodyear Tire & Rubber Company
• Original Assignee: Goodyear Tire & Rubber Company
• Inventors: Singh, Kanwar Bharat
• Granted Patent: US 9,442,045 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60T 2240/06 Wheel load; Wheel lift
• CPC Class Codes: B60T 2270/86 Optimizing braking by using ESP vehicle or tire model
• CPC Class Codes: B60T 8/171 Detecting parameters used in the regulation; Measuring values used in the regulation
• CPC Class Codes: B60T 8/172 Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters B60T8/17551 takes precedence
• CPC Class Codes: G01M 17/02 Tyres
• CPC Class Codes: G01N 3/40 Investigating hardness or rebound hardness
• CPC Class Codes: G01N 3/56 Investigating resistance to wear or abrasion

Abstract

A tire-based system and method for estimating longitudinal stiffness between a tire and a road surface includes a longitudinal stiffness adaptation model for calculating longitudinal stiffness between a tire and a road surface from a plurality of scaling factors including the load level, the measured air cavity pressure of the one tire, and the measured temperature of the one tire compensated by a wear state estimation of the one tire. The wear state is obtained from a vehicle-measured vertical mode shift of the tire.

Claims

1. A tire-based system for estimating longitudinal stiffness between a tire and a road surface comprising:

at least one tire mounted to a wheel hub and supporting a vehicle;

load measurement means for determining a load level on the one tire;

wear estimation means for estimating a wear state of the one tire;

tire-based sensor input means for measuring tire-based input parameters;

longitudinal stiffness adaptation model means for deriving a longitudinal stiffness estimation scaled by the load level, the tire-based sensor input parameters, and the wear state.

2. The system of claim 1, wherein the tire-based sensor input parameters are at least one input from the group:

a measured air cavity pressure of the one tire;

tire-specific construction characteristics of the one tire;

a measured temperature of the one tire.

5. The system of claim 2, wherein the longitudinal stiffness adaptation model means algorithmically calculates the longitudinal stiffness estimation from inputs including the load level, the measured air cavity pressure of the one tire and the measured temperature of the one tire compensated by a wear state estimation of the one tire.

6. The system of claim 5, wherein the load level, measured air cavity pressure of the one tire and the measured temperature of the one tire comprise compensating scaling factors within the longitudinal stiffness adaptation model.

3. The system of claim 3, wherein further comprising wear state estimator means for generating a wear state estimation for the one tire from a vehicle-measured acceleration of the wheel hub supporting the one tire.

4. The system of claim 3, wherein the wear state estimator means operably generates the wear state estimation from a detected a shift in a vertical mode of the one tire.

7. A tire-based method for estimating longitudinal stiffness between a tire and a road surface comprising:

measuring a load level on at least one tire mounted to a wheel hub and supporting a vehicle;

estimating a wear state of the one tire;

measuring at least one tire-based sensor-derived compensating input parameter;

calculating a longitudinal stiffness estimation scaled by the load level, the at least one tire-based input, and the one tire wear state.

8. The method of claim 7, wherein the at least one tire-based sensor-derived input parameter is from the group:

a measured air cavity pressure of the one tire;

tire-specific construction characteristics of the one tire;

a measured temperature of the one tire.

9. The system of claim 7, wherein further comprising generating a wear state estimation for the one tire from a vehicle-measured acceleration of a hub supporting the one tire.

10. The system of claim 9, wherein further comprising operably generating the wear state estimation from a detected a shift in a vertical mode of the one tire.

11. The system of claim 8, wherein the longitudinal stiffness adaptation model means algorithmically calculates the longitudinal stiffness estimation from a plurality of input parameters including the load level, the measured air cavity pressure of the one tire and the measured temperature of the one tire compensated by a wear state estimation of the one tire.

12. The system of claim 11, wherein the load level, measured air cavity pressure of the one tire, and the measured temperature of the one tire comprise compensating scaling factors within the longitudinal stiffness adaptation model.