Method for determining the tread depth of a vehicle tire while the vehicle is moving
US6327904A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1998 |
| Grant date | Dec 11, 2001 |
| Priority date | — |
| Expiry date | Apr 21, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B21/18
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A method for determining the tread depth of a vehicle tire during driving includes the step of determining the angle of a radially outer tire location relative to hub-based a coordinate system based of the vehicle tire by a sensor fastened to the vehicle. A signal containing harmonic oscillation sent by the sensor is then analyzed and, based on the signal, the resonant frequency is determined corresponding to the torsional oscillation component of the tire belt relative to the wheel. The mass moment of inertia of the tire belt about the axis of rotation is then computed based on the torsional stiffness of the tire sidewall and the determined resonant frequency. The actual mass and changes of the tire diameter are then calculated based on the computed mass moment of inertia and based on a mass function of the vehicle tire that is a function of the tire diameter. The loss of tread depth is then calculated based on the changes of the tire diameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.