Motor-driven power steering system
US4538698A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 1984 |
| Grant date | Sep 3, 1985 |
| Priority date | — |
| Expiry date | Jan 16, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2301/41812
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A power steering system makes use of a direct-current servomotor to produce an auxiliary torque added to the torque which is applied to the steering wheel of a vehicle by the driver. The system includes an electronic apparatus, which receives a signal indicating the velocity of the vehicle, divides the whole range of the vehicle velocity into at least three ranges, and determines under which of these ranges the present velocity falls. In the lowest range, the control apparatus energizes the motor to produce such an auxiliary torque. In the middle range, the apparatus de-energizes the motor and so no auxiliary torque is generated. In the highest range, the apparatus connects a load such as a resistor with the coil in the motor to brake the rotation of the steering wheel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.