Control apparatus for motor-driven power steering system of motor vehicle
US5504679A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1994 |
| Grant date | Apr 2, 1996 |
| Priority date | — |
| Expiry date | Feb 9, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/0493
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A control apparatus for an electric motor-driven power steering system includes a main CPU for arithmetically determining the steering assist torque to be generated by the electric motor and a driving direction thereof on the basis of outputs of a torque sensor and the vehicle speed sensor, a subsidiary CPU for arithmetically determining the driving direction of the motor on the basis of outputs of the torque sensor and the vehicle speed sensor and compare the driving direction signal supplied from the main CPU with a signal of the driving direction determined by the subsidiary CPU to generate a second driving direction signal. A coincidence/discrepancy signal representing coincidence or discrepancy between the motor driving direction signal and the steering torque signal is also supplied to the subsidiary CPU from the main CPU. The subsidiary CPU decides whether the motor driving direction signal coincides with a steering direction signal generated by the subsidiary CPU on the basis of the coincidence/discrepancy signal and the torque sensor signal. In dependence on the decision result, an enable/inhibit signal for enabling or inhibiting supply of the assist torque signal is issue…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.