Road surface condition estimating method, road surface condition estimating tire, road surface condition estimating apparatus, and vehicle control apparatus
US9046457B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2006 |
| Grant date | Jun 2, 2015 |
| Priority date | — |
| Expiry date | Oct 5, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60W2552/35
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The vibration of a tire 10 of a running vehicle in the circumferential direction or the width direction is detected by a road surface condition estimating tire 10, provided with an acceleration sensor 11 and a signal processing unit 12. Data of a detected vibration waveform are divided into data of three domains, namely, a pre-leading domain, a contact patch domain, and a post-trailing domain, and then the vibration levels in the pre-leading domain and the contact patch domain, respectively, are extracted. At the same time, a vibration component in a low-frequency band and a vibration component in a high-frequency band are extracted respectively from the vibration levels in the respective domains, and respective vibration level ratios R, which are each a ratio thereof, are calculated. Then, on the vehicle body side, the condition of a road surface on which the vehicle is running is estimated, based on the calculated vibration level ratio R and a map 32M, stored in a storage means 32, showing a relationship between the vibration level ratio R of tire vibration and road surface conditions. Thus a road surface condition can be estimated with accuracy even when there are changes in tem…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.