Electric power steering apparatus
US5927430A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1998 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Jul 29, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/0484
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An electric power steering apparatus includes a control unit having a sensor fault detecting section, a first drive control signal generating section, a second drive control signal generating section, and a motor drive control mode switching section. When the sensor fault detecting section does not detect any faulty sensor, operation of an electric motor is feedback-controlled in such a manner that an offset between a target current set in accordance with a steering torque and a motor current becomes zero, and the motor applies a steering assist torque to the steering system on the basis of a first drive control signal supplied from the first drive control signal generating section. When a faulty sensor is detected by the sensor fault detecting section, the motor drive control switching section changes over drive control modes of the motor such that the motor is feedforward-controlled on the basis of a second drive control signal which is generated by the second drive control signal generating section on the basis of a target current signal set in accordance with a steering torque.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.