Electro-hydraulic sensor fail safe
US8646473B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2011 |
| Grant date | Feb 11, 2014 |
| Priority date | — |
| Expiry date | Mar 23, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87113
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fail-safe system and method for an electro-hydraulic system. The system includes a controller, sensor, directional control valve, interlock, hydraulic valve and movement actuator. The directional control valve moves when the controller is moved. The interlock is hydraulically coupled to the directional control valve; and is in active position when the directional control valve is moved, and in shutoff position when the directional control valve is not moved. The hydraulic valve has an input side coupled to a flow source and an output side coupled to a hydraulic function. The movement actuator moves the hydraulic valve to a desired position as directed by the controller when the interlock is in the active position, and does not move the hydraulic valve when the interlock is in the shutoff position. The sensor detects movement of the controller and sends a control signal to the first valve actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.