Electric power steering apparatus
US6999862B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 11, 2005 |
| Grant date | Feb 14, 2006 |
| Priority date | — |
| Expiry date | Feb 11, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/0472
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An electric power steering apparatus has a motor controlled so as to generate steering assist power according to the steering torque required to operate a steering wheel. As a result of correction of the output of the motor in accordance with a value correlating with the rotation angular velocity correspondence value of the steering wheel, in the frequency response characteristic represented by the steering frequency of the steering wheel and the amplitude ratio of the steering torque relative to the steering angle of the steering wheel, the amplitude ratio is set within a setting range, at least within the steering frequency range when a person operates the steering wheel. As a result of correction of the output of the motor in accordance with a value directly correlating with the change velocity correspondence value of the steering torque, in the frequency response characteristic represented by the frequency of the disturbance torque input from the road surface to the steering system via vehicle wheels and the amplitude ratio of the steering torque relative to the disturbance torque, the amplitude ratio becomes smaller at the resonance frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.