Hydraulic circuit for active suspension system
US6467748B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 2000 |
| Grant date | Oct 22, 2002 |
| Priority date | — |
| Expiry date | Sep 5, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60G2500/30
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An active suspension system for supporting a mass, such as a seat on a base of a vehicle, includes a hydraulic actuator coupled between the seat and the base, an pneumatic off-load device between the seat and the base, and a control system which actively controls the hydraulic actuator and which controls the off-load member. The control system actively controls the hydraulic actuator as a function of a seat position error signal. A flow control valve controls the extension and retraction of the actuator. A proportional pressure control valve is connected between a primary pressure reducing valve and an inlet of the flow control valve. During start up, the pressure control valve prevents the supply of pressurized fluid to the flow control valve until the flow control valve is driven to its center or null position. During an electrical power failure, the solenoid operated pressure control valve is spring driven to a shut off position preventing communication of pressure to the flow control valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.