Measuring and testing – Volume or rate of flow – System
Patent
1977-08-02
1978-10-24
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
System
G01F 170
Patent
active
041214552
ABSTRACT:
In measuring the mass flow rate of the inlet air entering an internal combustion engine or other combustion device, or of the exhaust gas discharged therefrom, a constant metered flow of helium or other inert tracer gas is introduced through a temperature-controlled critical flow orifice into the air intake of the engine or device, and the exhaust gas is continuously sampled and the sample analyzed by means of a mass spectrometer. From the measurement of the concentration of the tracer gas in the exhaust gas sample provided by the mass spectrometer, the required mass flow rate is derived and displayed. The mass spectrometer may be employed to measure in sequence the concentrations of other constituents of the exhaust gas sample as well as that of the tracer gas, and from these measurements other parameters related to the mass flow rate of intake air may be derived by means of a microprocessor, and displayed.
REFERENCES:
patent: 2921841 (1960-01-01), Gerrish
patent: 3435659 (1969-04-01), Sternberg
patent: 3520657 (1970-07-01), Frumerman
patent: 3545270 (1970-12-01), Chang
patent: 3759259 (1973-09-01), Fletcher
patent: 3881351 (1975-05-01), Prachar
patent: 4055083 (1977-08-01), Haas
Haslett Robert Alan
Howard Charles Peter
Wheeler Richard Winston
Goldstein Herbert
Ricardo & Co., Engineers (1927) Limited
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