Measuring and testing – Volume or rate of flow – Proportional
Patent
1981-09-10
1983-12-06
Swisher, S. Clement
Measuring and testing
Volume or rate of flow
Proportional
73204, 73118, G01F 500, G01F 168
Patent
active
044185685
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 secondary passage such as a venturi (20) disposed within the passage for receiving a portion of the air flow, a tertiary passage (50) which draws an air sample from the main air flow passage and discharges it into the venturi throat (44), a constant temperature thermal anemometer (48) positioned to sense the sample air flowing in the tertiary passage, 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 (82) within the tertiary passage. In the preferred embodiment of the invention, an ambient air temperature sensor (84) 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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"Isuzu's New Coupe Incorporates Electronic and Electric Features", Automotive Engineering, Aug. 1981, 90-92.
Chapman, Jr. John E.
Eaton Corporation
Grace C. H.
Lewis J. G.
Swisher S. Clement
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