Air flow rate meter
US5119672A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1991 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Jan 24, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F5/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An air flow rate meter, in particular for measuring the mass of air aspirated by an internal combustion engine, has a main flow conduit with a venturi-like flow portion and a bypass conduit, which discharges with an inlet and outlet opening above and below the venturi-like flow portion, respectively. A temperature-dependent measuring resistor is disposed in the bypass conduit. To avoid impairment of the measured value signal by an increase in the noise component caused by turbulence of the air upstream of the venturi-like flow portion, which unavoidably occurs upon deflection of the air flow direction, the inlet opening of the bypass conduit is shifted in the flow direction upstream of the deflection of the air flow, into a region of quasi-laminar flow with a constant pressure profile.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.