Calibration method for exhaust mass flow measuring system
US4823591A · kind A · utility
33Cited by
20References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 5, 1987 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Nov 5, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2001/244
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A testing apparatus for sampling the emission content of the source when a portion of the exhaust gas is optionally diluted using clean dry air added near the sample extraction point. A sonic venturi is used to establish a constant mass flow rate from the exhaust system of the engine under test and a subsonic venturi monitors the flow rate of dilution air. Both venturis provide flow rate signals which are substracted to determine the flow rate of the exhaust.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.