Methods and systems for monitoring quality of hydraulic fluid in electro-hydraulic (EH) valve
US10139375B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2016 |
| Grant date | Nov 27, 2018 |
| Priority date | — |
| Expiry date | Dec 2, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0258
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for monitoring quality of a hydraulic fluid in an electro-hydraulic (EH) valve is disclosed. The method includes applying predetermined signal to a solenoid coil, surrounding a pusher pin in EH valve, to facilitate oscillation of a pusher pin in EH valve to change static friction between the pusher pin and a cavity of EH valve, to dynamic friction. EH valve includes a housing defining the cavity having an end wall. Cavity slidably receiving the pusher pin having a first end and a second end. The hydraulic fluid is received between the first end of the pusher pin and the end wall. The oscillation of the pusher pin generates an acoustic wave that propagates through the hydraulic fluid. The method further includes determining the quality of the hydraulic fluid based on one or more characteristics of the acoustic wave detected by an acoustic sensor positioned on the end wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.