Method and apparatus for estimating tire air pressure
US6711508B2 · kind B2 · utility
1Cited by
6References
4Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Nov 27, 2001 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Nov 27, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2203/0676
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention provides an apparatus and a method of estimating tire air pressure with high accuracy from vehicle operation at low at high speeds regardless of various elements to be mounted to the vehicle. Estimation of tire air pressure based on a resonance frequency extracted based on a wheel speed signal outputted from a wheel speed sensor corresponding to the respective tire and estimation of tire air pressure based on a dynamic load radius derived based on the wheel speed signal, are used to selectively switch in accordance with a magnitude of a variance value of the resonance frequency at a plurality of time points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.