Measuring and testing – Volume or rate of flow – Proportional
Patent
1981-05-19
1984-05-22
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Proportional
G01F 168, G01F 500
Patent
active
044494017
ABSTRACT:
A low pressure drop hot film/swirl air flowmeter (10) for an automotive engine is disclosed. The flowmeter includes a main air flow passage (18), a relatively small venturi (20) disposed within the passage for receiving a portion of the air flow, a constant temperature thermal anemometer (48) positioned to sense the air flowing in the throat (44) of the venturi, and a set of swirl vanes (22) 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 forced aspiration therethrough without appreciably increasing the pressure drop across the flowmeter. The anemometer includes a bridge circuit (114), one leg of which comprises a resistive sensor (70) within the throat of the venturi. In the preferred embodiment of the invention, an ambient air temperature sensor (72) is included as another of the legs of the bridge to provide temperature compensation for the flowmeter. The anemometer generates an output signal representative of total mass air flow through the flowmeter.
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Kaiser Hermann
Olson Jerry A.
Eaton Corporation
Goldstein Herbert
Grace C. H.
Lewis J. G.
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