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:
Oct. 08, 1996
Filed:
Jan. 23, 1995
Vincent Ferri, Pittsburgh, PA (US);
Westinghouse Air Brake Company, Wilmerding, PA (US);
Abstract
Fluid flow in a conduit is measured by placing a flow block in the conduit which introduces variations in the flowpath which cause local pressure variations. The pressure variations are converted to electrical signals by transducers, and the electrical signals are processed to obtain flow rate values. To provide a correction for transducer drift, the transducer signals are examined during a time when there is known to be zero flow in the conduit. The difference between the transducer signals during a time when there is zero flow is used as a measure of transducer drift. A value for the drift is stored in computer memory and used subsequently, when fluid flow is resumed. This invention is specifically intended for use in railroad airbrake systems, where it is used in a locomotive to provide an accurate and reliable measurement of air supplied to the brake pipe of the air brake system.