Method and device for detecting when a closing point of a hydraulic valve has been reached
US9316478B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2011 |
| Grant date | Apr 19, 2016 |
| Priority date | — |
| Expiry date | Jul 3, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/2058
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method and device are provided for detecting when a closing point of a hydraulic valve has been reached. The valve has a closing element operated by an electric actuator. A predetermined voltage for closing the valve is applied to the actuator. A profile of a current flowing through the actuator is detected. Based on a first increase in the profile corresponding to the valve being at least partially open, a subsequent decrease in the profile corresponding to the closing element carrying out a movement to close the valve, and a second increase in the profile following said decrease in the profile, a local minimum of the detected current is determined between the decrease and the second increase in the profile. Depending on the local minimum of the detected current, a closing point is then determined which corresponds to a time point of the local minimum of the detected current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.