Vehicular steering device
US6931313B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 2, 2004 |
| Grant date | Aug 16, 2005 |
| Priority date | — |
| Expiry date | Sep 2, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T2220/03
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A first ECU 30 detects a steering torque applied to a steering system, estimates a self-aligning torque generated in a front wheel on the basis of the steering torque, and estimates a side force for the front wheel on the basis of lateral acceleration and a yaw rate. The first ECU 30 estimates a grip factor ε for the front wheel on the basis of a change of the self-aligning torque to the side force. The first ECU 30 judges whether the grip factor is below a second OS (oversteer) start threshold value. A second ECU 40 controls the transfer ratio according to the vehicle state when the grip factor is less than the second OS start threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.