Hydraulic control system having over-pressure protection
US9145660B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2012 |
| Grant date | Sep 29, 2015 |
| Priority date | — |
| Expiry date | Mar 27, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B2211/8606
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulic control system for a machine is disclosed. The hydraulic control system may have a tank, a pump configured to draw fluid from the tank and pressurize the fluid, an actuator, and a control valve configured to direct fluid from the pump to the actuator and from the actuator to the tank to move the actuator. The hydraulic system may also have a main relief valve movable away from a closed position to pass pressurized fluid to the tank when a pressure of the fluid directed to the actuator exceeds a first threshold pressure, and a controller in communication with the pump. The controller may be configured to selectively reduce a displacement of the pump after the main relief valve has moved away from the closed position when the pressure of the fluid directed to the actuator exceeds a second threshold pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.