Method and apparatus for estimating tire air pressure
US6584427B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 27, 2001 |
| Grant date | Jun 24, 2003 |
| Priority date | — |
| Expiry date | Nov 27, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60C23/061
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The present invention provides a method and apparatus for estimating a state of tire air pressure with high accuracy in a range of vehicle speeds from a low travel speed to a high travel speed. A wheel speed of each of a right-hand front wheel and a right-hand rear wheel is detected based on wheel speed signals outputted from vehicle speed sensors, and characteristic amounts (power) of frequency characteristics of the wheel speeds are calculated. A value of difference which represents a degree of difference between the obtained characteristic amounts of the right-hand front wheel and the right-hand rear wheel is calculated. Based on the value of difference, the state of air pressure of a tire is determined. As a result, it can be determined if the air pressure of one of tires on the right-hand front wheel and the right-hand rear wheel has been reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.