Electric power steering system
US8781682B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2010 |
| Grant date | Jul 15, 2014 |
| Priority date | — |
| Expiry date | Nov 4, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/0463
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A motor control signal output unit of an electric power steering system includes a feedback gain calculation unit (52), and a feedback control unit executes a feedback control with the use of a proportional gain (Kp) and an integral gain (Ki) that are calculated by the feedback gain calculation unit (52). The feedback gain calculation unit (52) sets the feedback gains to large values (Kp=P0, Ki=I0) when the absolute value of an assist gradient (α) is equal to or smaller than a predetermined value (α0) (|α|≦α0). On the other hand, when the absolute value of the assist gradient (α) exceeds the predetermined value (α0) (|α|>α0), the feedback gain calculation unit (52) sets the feedback gains to small values (Kp=p1, Ki=I1:P1<P0, I1<I0).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.