Apparatus and method for determining the linear position of a hydraulic cylinder
US5471147A · kind A · utility
22Cited by
5References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 3, 1991 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Oct 3, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/248
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus (102) and method for detecting the position of a piston and piston rod (104,106) within a housing (108) of a hydraulic cylinder (110). The piston (104), piston rod (106), and housing (108) form first and second coaxial resonant cavities (114,116). A first location of the piston and piston rod (104,106) is determined as a function of the resonant frequency of one of the coaxial cavities (114,116). A second location of the piston and piston rod (104,106) is determined as function of the resonant frequency of the other cavity if the first location is invalid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.