Thermal-type air flow measuring instrument with fluid-direction judging capability
US5696321A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 18, 1995 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | Oct 18, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/6842
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is disclosed a thermal-type air flow measuring instrument which judges whether the direction of flow of a fluid, ranging from a static flow to a pulsating flow involving a reverse flow, is forward or reverse, and outputs a signal corresponding to the flow rate of the fluid, thereby measuring the flow rate with high precision. An auxiliary passage is provided in a fluid passage, and is constituted by first, second and third passageways. Two temperature sensing resistors are mounted respectively at an upstream side and a downstream side within the first passageway in close proximity to each other. Most of the fluid, flowed into the first passageway in a forward direction, flows through the second passageway. The third passageway serves to direct a reverse flow of the fluid toward the temperature sensing resistors. Results of measurement of the flow rate of intake air in an internal combustion engine indicate that a minus error due to a pulsating flow, experienced in the conventional construction, is eliminated almost completely, and that a plus error due to a reverse flow is reduced to about 1/10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.