Control apparatus for electric power steering system
US5861725A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1997 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Aug 12, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/0463
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A steering force assist command value in correspondence with a steering torque is represented by approximation function equations lower than the order of the higher order function equation. The steering torque is sampled at predetermined time intervals and the steering force assist command value in correspondence with the sampled steering torque is calculated by the approximation function equations where when data outputted from a calculation device comprise 16-bit data, upper 8-bit data is outputted to a motor drive circuit and lower 8-bit data is omitted, and the omitted lower 8-bit data is added in calculating operation of next sampling period. An error of the steering force assist command value by omission of the lower 8-bit data is reduced and steering feeling can be improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.