Method and apparatus for determining an individual wheel surface coefficient of adhesion
US6549842B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 2001 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | Oct 31, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T2210/12
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The present invention provides a method of estimating a coefficient of adhesion between a road surface and a plurality of tires disposed on a vehicle. An estimated coefficient of adhesion for each of the plurality of tires is provided. First values of longitudinal and lateral forces on the tires are determined from a first set of vehicle dynamic parameters requiring no explicit knowledge of the coefficient of adhesion; and second values of the same forces are determined from a second set of vehicle parameters in an analytic tire model including the estimated value of the coefficient of adhesion. Differences between the first and the second values of the forces on the tires are determined in the longitudinal and lateral directions. Longitudinal and lateral adaptation speeds are determined for each of the plurality of tires; and a coefficient of adhesion adjustment for each of the plurality of tires is estimated from the differences and the adaptation speeds. The estimated coefficients of adhesion for each of the plurality of tires are updated with the estimated coefficient of adhesion adjustments in a reiterative process minimizing the differences.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.