Device for measuring the flow rate of a fluid and air flow sensor system in an internal combustion engine utilizing such a device
US4361050A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1980 |
| Grant date | Nov 30, 1982 |
| Priority date | — |
| Expiry date | Oct 9, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S73/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flowmeter incorporating a pressure differential member creating a differential pressure between an upstream flow path and a downstream flow path of a pipe. The flowmeter has pressure connecting lines located on either side of the pressure differential member and constituted by conduits issuing on the surface of the device. The pressures in the upstream and downstream flow paths are transferred to a differential pressure sensor constituted by two elastic surface wave oscillators supplying signals, whose frequency is proportional to the pressures. The signals are then transmitted to a mixer, whose output supplies a beat signal, whose frequency is equal to the difference of the frequencies of the signal supplied by the oscillators. This frequency difference is directly proportional to the differential pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.