Tire air pressure optimization system for improving tread wear
First Claim
1. A method for regulating air pressure of a tire on a vehicle, the tire having shoulders, a tread with a ground contacting portion, and defining lateral and longitudinal directions, the lateral direction being parallel to an axis of rotation of the tire, the longitudinal direction being perpendicular to the axis of rotation of the tire, the method comprising:
- ascertaining an actual or anticipated tire load La on the tire;
selecting, from a correlation of preferred air pressures Pp for a range of multiple tire loads Li, on the tire, a preferred air pressure Pp for the actual or anticipated load La on the tire; and
adjusting the air pressure of the tire while on the vehicle to the preferred air pressure Pp for the actual or anticipated tire load La; and
wherein determination of the correlation of preferred air pressures Pp comprises;
dividing the tread of the tire into multiple zones along the lateral direction, the multiple zones including a shoulder zone along each shoulder of the tire and one or more intermediate zones between the shoulder zones;
selecting a range of tire air pressures;
determining, for a load Li, in the range of multiple tire loads Li, the average longitudinal stress σ
x in each of the zones over the selected range of tire air pressures;
identifying, from the selected range of tire air pressures, the preferred air pressure Pp for the load Li, wherein the preferred air pressure Pp is the pressure at which both i) the average longitudinal stress σ
x-avg for all of the zones is minimized and ii) the average longitudinal stress σ
x-avg for each of the intermediate zones is maintained at or above a predetermined threshold longitudinal stress σ
x-th; and
repeating, over the range of multiple tire loads Li, the determining and identifying so as to provide the correlation of the preferred air pressures Pp.
3 Assignments
0 Petitions
Accused Products
Abstract
A system is provided for automatically adjusting the air pressure of a tire based on variations in loading to improve tread wear. For a particular loading of the tire, the system provides for the determination of a preferred air pressure setting designed to minimize tread wear. This preferred air pressure, Pp, is determined from an analysis of the longitudinal stresses that occur within the contact patch of the tread.
11 Citations
9 Claims
-
1. A method for regulating air pressure of a tire on a vehicle, the tire having shoulders, a tread with a ground contacting portion, and defining lateral and longitudinal directions, the lateral direction being parallel to an axis of rotation of the tire, the longitudinal direction being perpendicular to the axis of rotation of the tire, the method comprising:
-
ascertaining an actual or anticipated tire load La on the tire; selecting, from a correlation of preferred air pressures Pp for a range of multiple tire loads Li, on the tire, a preferred air pressure Pp for the actual or anticipated load La on the tire; and adjusting the air pressure of the tire while on the vehicle to the preferred air pressure Pp for the actual or anticipated tire load La; and wherein determination of the correlation of preferred air pressures Pp comprises; dividing the tread of the tire into multiple zones along the lateral direction, the multiple zones including a shoulder zone along each shoulder of the tire and one or more intermediate zones between the shoulder zones; selecting a range of tire air pressures; determining, for a load Li, in the range of multiple tire loads Li, the average longitudinal stress σ
x in each of the zones over the selected range of tire air pressures;identifying, from the selected range of tire air pressures, the preferred air pressure Pp for the load Li, wherein the preferred air pressure Pp is the pressure at which both i) the average longitudinal stress σ
x-avg for all of the zones is minimized and ii) the average longitudinal stress σ
x-avg for each of the intermediate zones is maintained at or above a predetermined threshold longitudinal stress σ
x-th; andrepeating, over the range of multiple tire loads Li, the determining and identifying so as to provide the correlation of the preferred air pressures Pp. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A system for adjustment of tire air pressure on a vehicle, comprising:
-
equipment for measuring the pressure of at least one tire on the vehicle; equipment for adjusting the pressure of at least one tire on the vehicle; and a controller configured for ascertaining an actual or anticipated tire load La on the tire; selecting, from a correlation of preferred air pressures Pp for a range of multiple tire loads Li on the tire, a preferred air pressure Pp for the actual or anticipated load La on the tire; and adjusting the air pressure of the tire while on the vehicle to the preferred air pressure Pp for the actual or anticipated tire load La; wherein determination of the correlation of preferred air pressures Pp comprises; dividing the tread of the tire into multiple zones along the lateral direction, the multiple zones including a shoulder zone along each shoulder of the tire and one or more intermediate zones between the shoulder zones; selecting a range of tire air pressures; determining, for a load Liin the range of multiple tire loads Li, the average longitudinal stress σ
x in each of the zones over the selected range of tire air pressures;identifying, from the selected range of tire air pressures, the preferred air pressure Pp for the load Li, wherein the preferred air pressure Pp is the pressure at which both i) the average longitudinal stress σ
x-avg for all of the zones is minimized and ii) the average longitudinal stress σ
x-avg for each of the intermediate zones is maintained at or above a predetermined threshold longitudinal stress σ
x-th; andrepeating, over the range of multiple tire loads Li, the determining and identifying so as to provide the correlation of the preferred air pressures Pp. - View Dependent Claims (9)
-
Specification