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:
Feb. 16, 1993
Filed:
Sep. 09, 1991
Yoshihito Sekine, Ibaraki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Flow rate measuring method and apparatus for determining a flow rate of a fluid flowing through a pipe by using a fuzzy inference system which is operative on the basis of fuzzy knowledge including fuzzy rules each described in the form of an IF part and a THEN part, and membership functions defining meanings of statements described in said IF and THEN parts. Flow velocity of the fluid is measured at a plurality of locations within the pipe by a plurality of sensors. A table of membership functions indicating grades of fitness of the flow velocities to a distorted flow model distribution is provided in a storage together with a mean flow rate calculating expression for deriving a flow rate corresponding to the distorted flow model distribution. A membership grade of the measured flow velocity to the distorted flow model distribution is determined by referring to the membership function table through the medium of the measured flow velocity, and a weighted mean of the flow rates given by the mean flow rate calculating expression is determined by using as a weight the membership grade to the distorted flow model distribution.