Tread wear estimation system and method

Patent metadata

Field	Value
Publication number	US-9719886-B2
Application number	US-201514804597-A
Country	US
Kind code	B2
Filing date	Jul 21, 2015
Priority date	Jul 21, 2015
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A tire wear state estimation system for a tire calculates tire effective radius during measured distance intervals travelled by the tire from vehicle speed and tire rotation counters. The system includes a filter for selecting slow-speed effective radius measuring intervals and an estimator for estimating the tire effective radius during only those intervals in which the vehicle is travelling below a threshold speed.

First claim

What is claimed is:

1. A tire wear state estimation system comprising:
a tire supporting a vehicle;
a vehicle-based sensor for measuring a plurality of distance intervals travelled by the tire during vehicle operation at different vehicle speeds;
a vehicle-based tire revolution counter for counting a tire revolution count within each of the plurality of distance intervals;
a vehicle-based speed sensor for determining the vehicle ground speed during the plurality of distance intervals travelled by the tire;
a slow-speed interval selector operative to select at least one slow-speed distance interval from the plurality of distance intervals operatively based on the vehicle travelling at a ground speed less than a pre-selected threshold level;
an effective radius estimator for estimating a slow-speed effective radius of the tire during the at least one slow-speed distance interval from the tire revolution count and the distance travelled by the tire during the at least one slow-speed distance interval; and
a tire wear-state estimator operative to estimate a tire wear-state from the estimated slow-speed effective radius of the tire during the at least one slow-speed distance interval.

2. The tire wear state estimation system of claim 1 , wherein the effective radius estimator is operative to estimate a slow-speed effective radius of the tire during a plurality of slow-speed distance intervals and the tire wear-state estimator is operative to estimate a tire wear-state from a combined averaging of the estimated slow-speed effective radius estimations of the tire during the plurality of slow-speed distance intervals.

3. The tire wear state estimation system of claim 2 , further comprising a display for communicating the estimated tire wear-state to an operator of the vehicle.

4. The tire wear state estimation system of claim 3 , wherein the display comprises a handheld device communicating the estimated tire wear-state from the tire-wear state estimator.

Assignees

• Goodyear Tire & Rubber

Inventors

• Luk Yiu Wah
• Lotliker Darshan Balkrishna

Classifications

• B60C23/04

  mounted on the wheel or tyre · CPC title

• G01M17/02 Primary

  Tyres · CPC title

• B60C23/0408

  transmitting the signals by non-mechanical means from the wheel or tyre to a vehicle body mounted receiver · CPC title

• B60C11/243

  Tread wear sensors, e.g. electronic sensors · CPC title

• B60C23/06

  Signalling devices actuated by deformation of the tyre {, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle} · CPC title