Measuring and testing – Volume or rate of flow – Proportional
Patent
1978-12-06
1980-11-11
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Proportional
7386163, G01F 500
Patent
active
042325498
ABSTRACT:
A low pressure drop air flowmeter for an automobile engine is disclosed. The meter contains a main air flow passage, a relatively small venturi to receive a portion of the air flow, pressure ports for sensing stagnation and static pressure and a set of swirl vanes disposed adjacent the outlet of the venturi and operative to impart a swirl to the remainder of the air in the main passage, thereby creating a reduced pressure at the venturi outlet for amplifying the pressure difference between the stagnation and static pressure without appreciably increasing the pressure drop across the flowmeter. A tertiary passage provides a path of fluid communication between points upstream and downstream of the swirl vanes. This passage can be selectively opened or restricted by a valve which, in the preferred embodiment of the invention, opens the tertiary passage with increasing overall flow rate. This arrangement results in a fluid flowmeter having a characteristic pressure drop which is less than that of a conventional device, particularly at high flow rates. Also disclosed is a solenoid valve operative to selectively sample stagnation pressure in the tertiary passage and signal pressure in the throat of the venturi and generate an electrical output signal as a function of the difference between these two pressure signals.
REFERENCES:
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patent: 3086395 (1963-04-01), York
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patent: 3407657 (1968-10-01), Maver
patent: 3834230 (1974-09-01), Auerbach
patent: 4012957 (1977-03-01), Chiles et al.
patent: 4164144 (1979-08-01), Kaiser et al.
Migrin Robert S.
Olson Jerry A.
Eaton Corporation
Goldstein Herbert
Lewis J. G.
McCloskey R. J.
Wood D.
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