Measurement of automobile exhaust flow

Details Measurement of automobile exhaust flow Measurement of automobile exhaust flow

2006-05-16

2008-03-18

McCall, Eric S. (Department: 2855)

Measuring and testing

Gas analysis

Gas of combustion

C073S118040

Reexamination Certificate

active

07343778

ABSTRACT:
A method of overcoming the problems of measuring the exhaust flow from a vehicle engine, which flow is pulsating and reversing, making it difficult to accurately measure. An amount of flow is added to the exhaust flow so that the combined amount of flow exceeds the reversals, and therefore the flow through the primary measuring device is raised a sufficient amount so that the measured flow of the exhaust is always positive. The source of the added flow can be by diverting some of the exhaust flow itself downstream from the measurement device and reintroducing it upstream of the measurement device. In the alternative, the added flow can be from a source external to the exhaust flow.

REFERENCES:
patent: 4505160 (1985-03-01), Zacharias, Jr.
patent: 4660408 (1987-04-01), Lewis
patent: 4742717 (1988-05-01), Ichino
patent: 4783997 (1988-11-01), Lynnworth
patent: 5052425 (1991-10-01), Hohenberg et al.
patent: 5184501 (1993-02-01), Lewis et al.
patent: 5604319 (1997-02-01), Kohsaka et al.

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