Method and apparatus for determining the flow rate of a flowing

Details Method and apparatus for determining the flow rate of a flowing Method and apparatus for determining the flow rate of a flowing

1990-10-26

1993-03-16

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

7320416, 731182, G01F 168

Patent

active

051933888

ABSTRACT:
A method and apparatus controls the temperature of a precision resistor and, in turn, measures the flow rate of a flowing fluid mass. The precision resistor is a hot wire or hot film of an air mass meter of an internal combustion engine of a motor vehicle. Through timed current flow, the operating temperature of the precision resistor is maintained at a higher temperature than the temperature of the flowing fluid mass. The timing of the electric current for maintaining the operating temperature of the precision resistor is controlled based on the magnitude of the gating voltage supplied to heat the precision resistor.

REFERENCES:
patent: 3603147 (1971-09-01), Dorman
patent: 3928800 (1975-12-01), Strenglein
patent: 4043195 (1977-08-01), Hunting
patent: 4334186 (1982-06-01), Sasayama et al.
patent: 4649745 (1987-03-01), Konda et al.
patent: 4934189 (1990-06-01), Tanimoto et al.

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