Apparatus for measuring the mass of a fluid medium

Details Apparatus for measuring the mass of a fluid medium Apparatus for measuring the mass of a fluid medium

1979-12-18

1981-08-18

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

042839440

ABSTRACT:
An apparatus is proposed for measuring the mass of a fluid medium such as the mass of air induced by internal combustion engines which has at least one temperature-dependent measuring resistor film disposed in the flow of the medium, whose temperature and/or resistance is regulated in accordance with the mass of the medium and wherein the manipulated variable is a measure for the mass of the medium. The temperature-dependent measuring resistor film is disposed on a carrier separated therefrom by an insulating film and a temperature-dependent heating resistor film. The temperature of the heating resistor film is regulated to approximately the same temperature as the temperature-dependent measuring resistor film so that a heat flow between the temperature-dependent measuring resistor and the carrier is prevented. As a result, the response speed of the apparatus to changes in the flow rate of the medium is substantially improved as is the precision of measurement.

REFERENCES:
patent: 4213335 (1980-06-01), Peter et al.
patent: 4214478 (1980-07-01), Lauterbach

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