Variable assist power steering system with electro-hydraulic working pressure and directional pressure control
US5553683A · kind A · utility
16Cited by
11References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 20, 1995 |
| Grant date | Sep 10, 1996 |
| Priority date | — |
| Expiry date | Jan 20, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/09
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A variable assist power steering system for a motor vehicle has an electronically controlled working pressure valve which normally maintains a working pressure at a relief pressure but increases it in response to steering of the vehicle and according to vehicle status, such as vehicle speed. The system also has electronically controlled direction control valves which are actuated to selectively reduce the working pressure to one side or the other of the steering gear piston so as to match a measured handwheel torque with a value which is desired for the vehicle status.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.