Calibration method for exhaust mass flow measuring system
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United States of America Patent
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Apr 25, 1989
Grant Date -
N/A
app pub date -
Nov 5, 1987
filing date -
Nov 5, 1987
priority date (Note) -
Expired
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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.
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