Method for detecting a deflated tire on a vehicle
US6222444A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 3, 2000 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | Apr 3, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60C23/061
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Wheel speed values for each of four wheels are collected and statistically analyzed axle by axle for a difference which could indicate low tire pressure. Prior to analysis, and following reset of the system, calibration factors are determined for each axle to compensate for rolling radius variation, and are subsequently used to correct the percentage difference values for the two wheels on any one axle. When a sufficient number of values have been collected, a t.sub.0 value is calculated for each axle according the paired t-test statistical method or a slight variation thereof The t.sub.0 value for each axle is then compared to a respective empirical value based on a predetermined pressure loss. This comparison can provide the basis for a driver warning. Various types of filters can be used prior to calculating the t.sub.0 values to eliminate data that may lead to improper deflation detection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.