Airflow sensor with gas composition correction
US10634535B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2018 |
| Grant date | Apr 28, 2020 |
| Priority date | — |
| Expiry date | Sep 30, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F15/043
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor for sensing a flow rate of a fluid comprises an upstream resistive element having a first resistance that changes with temperature, a downstream resistive element having a second resistance that changes with temperature, at least one tail resistor configured to determine thermal conductivity of the fluid, at least one pressure sensor configured to determine a differential pressure in the flow direction of the fluid, and circuitry configured to use the differential pressure with the thermal conductivity to determine a kinematic viscosity of the fluid, and compensate an output of the bridge circuit. The downstream resistive element is situated downstream of the upstream resistive element in the flow direction of the fluid, and the upstream resistive element and the downstream resistive element are operatively connected in a bridge circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.