Displacement amount measuring device
US7124045B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 2005 |
| Grant date | Oct 17, 2006 |
| Priority date | — |
| Expiry date | May 12, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D16/2013
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A disclosed device eliminates an error in a displacement amount measured value caused by changes over time in a characteristic of a displacement sensor, and can always maintain high accuracy of measurement. When a hydraulic valve, to which the displacement sensor is mounted, is positioned at predetermined positions, output signals from the displacement sensor are acquired as sample values. On the basis of the acquired sample values, a trend of changes over time in the characteristic of the displacement sensor is computed. Settings of a conversion table, which is used for displacement amount computation, are corrected in a direction along the computed trend of changes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.