Electric power steering apparatus
US6439336B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 6, 2001 |
| Grant date | Aug 27, 2002 |
| Priority date | — |
| Expiry date | Mar 6, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/0487
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A controller for controlling the assist steering torque of an electric motor in an electric power steering apparatus has a relay failure detection unit for detecting ON failure which arises in a relay circuit provided between an electric motor driving circuit and a power supply; and a relay failure correction unit for decreasing the assist steering torque, at least the maximum value of the assist steering torque, of the electric motor based on a failure detection signal from the relay failure detection unit. Thereby, manual steering by a steering wheel with a heavier steering torque than the torque at the time of a normal mode becomes possible as deal at the time that ON failure arises in a relay circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.