Fluid flow self calibration scheme
US4879662A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1988 |
| Grant date | Nov 7, 1989 |
| Priority date | — |
| Expiry date | Mar 11, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D7/0635
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fluid system for calibrating a variable area metering valve during flight when the fluid receiver is not in operation employs several single point fixed calibration orifices that are sequentially used to establish a corresponding number of calibration points in a short time interval. The position of the metering valve movable element is stored in a memory of a microprocessor for each calibration point and the metering valve may thereafter be driven by the microprocessor to control with precision flow rates to the receiver without the need for a flow meter. Operation is free to bench calibration inaccuracies and possible drift due to mechanical wear.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.