Method and system for measuring fluid flow rate by using fuzzy i

Details Method and system for measuring fluid flow rate by using fuzzy i Method and system for measuring fluid flow rate by using fuzzy i

1991-09-09

1993-02-16

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

F02M 5100

Patent

active

051861500

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.

REFERENCES:
patent: 4951209 (1990-08-01), Nagaishi et al.
patent: 4957088 (1990-09-01), Hosaka
patent: 4967715 (1990-11-01), Hosaka
patent: 4974503 (1990-12-01), Ikeda et al.
patent: 4991560 (1991-02-01), Arai
patent: 5050560 (1991-09-01), Plapp

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