The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 1984
Filed:
May. 19, 1981
Hermann Kaiser, Utica, MI (US);
Jerry A Olson, Dearborn, MI (US);
Eaton Corporation, Cleveland, OH (US);
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.