Linear measurement in piston-cylinder arrangements
US11118941B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 22, 2019 |
| Grant date | Sep 14, 2021 |
| Priority date | — |
| Expiry date | Oct 6, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16F9/3292
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method for measuring the position of a piston-cylinder arrangement, said method comprising: providing the piston-cylinder arrangement, providing an electrical circuit unit, applying a DC voltage (Vcc) to the piston-cylinder arrangement, sensing a capacitance (C) of the piston-cylinder arrangement as an input variable for the electrical circuit unit, generating a pulsed DC voltage (Vcc) by means of the electrical circuit unit on the basis of the sensed capacitance (C) of the piston-cylinder arrangement, providing a measuring unit for measuring a frequency (F0, F1) of the pulsed DC voltage (Vcc) generated, determining a frequency difference (DF) between the frequency (F0) of the pulsed DC voltage (Vcc) before displacement of the piston within the cylinder and the frequency (F1) of the pulsed DC voltage (Vcc) after displacement of the piston within the cylinder, determining a displacement distance of the piston within the cylinder on the basis of the frequency difference (DF).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.