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:
Jul. 31, 1984
Filed:
Dec. 17, 1981
Werner Fehr, Steinheim, DE;
Sueddeutsche Kuehlerfabrik Julius Fr. Behr GmbH & Co. KG, Stuttgart, DE;
Abstract
Disclosed is a method for controlling the volume of a fluid, e.g., air, moving through a duct system, e.g., a ventilating system for a vehicle, comprising the steps of moving the fluid through an inlet of the duct system under dynamic pressure; conducting the fluid through the duct system by means of propulsion system driven by an electric motor, wherein the electric current drawn by said motor varies with changes in the dynamic pressure; and adjusting the amount of fluid admitted into the duct system in response to the current drawn by the motor and thus, also responsive to the dynamic pressure, this adjusting step thereby maintaining a constant volume of fluid moving through the air duct system. Also disclosed is an apparatus for carrying out this method.