Electric power steering apparatus
US6112846A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1998 |
| Grant date | Sep 5, 2000 |
| Priority date | — |
| Expiry date | Aug 27, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/0469
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An electric power steering apparatus includes a proportional plus integral control section incorporated in a control unit for achieving proportional plus integral control action of an offset between a target motor current to be supplied to an electric motor and a motor current actually flowing in the electric motor, and an overshoot diminishing section for controlling at least one of proportional sensitivity and integral gain of the proportional plus integral control section so as to diminish overshoot of the motor current occurring when the steering wheel is quickly turned until it reaches a steering lock position. With this arrangement, semiconductor devices used in the control unit for driving the electric motor are protected against damage caused when subjected to an overload resulting from the overshoot of the motor current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.