Device for determining the flow rate of a flowing medium

Details Device for determining the flow rate of a flowing medium Device for determining the flow rate of a flowing medium

1983-11-17

1985-07-09

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

045274274

ABSTRACT:
A device is proposed for determining the flow rate of a flowing medium, in particular the flow rate of air aspirated by an internal combustion engine which includes at least two temperature-dependent measuring resistors which are exposed to the flowing medium, each disposed in a separate bridge circuit, heated to different temperatures and regulated such as to be constant. The measuring resistors as well as the other bridge resistors are embodied as film resistors and are disposed opposite one another, each on a different side of a substrate. One signal per bridge, dependent on the currents flowing through the bridges, is supplied to a signal processing unit, the output variable of which represents a standard for the flow rate of the flowing medium that is independent of the temperature of the flowing medium.

REFERENCES:
patent: 3604261 (1971-09-01), Olin
patent: 3942378 (1976-03-01), Olmstead
patent: 4043196 (1977-08-01), Trageser
patent: 4214478 (1980-07-01), Lauterbach

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