Arrangement for measuring the mass flow-rate of a flowing medium

Details Arrangement for measuring the mass flow-rate of a flowing medium Arrangement for measuring the mass flow-rate of a flowing medium

1983-11-21

1986-05-13

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

G01F 168

Patent

active

045878420

ABSTRACT:
The invention is directed to an arrangement for determining the mass rate of flow of a flowing medium, especially the mass rate of flow of air required in the combustion process of an internal combustion engine. The arrangement of the invention includes at least two temperature-dependent resistors which are placed directly in the flowing medium. The arrangement further includes two actively operated bridge connected to respective operational amplifiers. By means of a simple arithmetic coupling of the values of both bridge currents, an output signal is obtained which uniquely serves as an indication of the mass rate of flow and is independent of the temperature of the flowing medium. The condition that the two temperature-dependent resistors are operated at constant temperature independently of the temperature of the flowing medium permits further improvements to be realized. More specifically, the two temperature-dependent resistors can be configured as film resistors on a massive substrate without any loss in the speed of response. By utilizing two temperature-dependent resistors in a single bridge, an improved sensitivity of the arrangement can be obtained and an indication of the direction of flow of the medium can be achieved.

REFERENCES:
patent: 3429178 (1969-02-01), Durbin
patent: 3603147 (1971-09-01), Dorman
patent: 3747577 (1973-07-01), Mauch
patent: 4043195 (1977-08-01), Hunting
patent: 4043196 (1977-08-01), Trageser
patent: 4083244 (1978-04-01), Agar et al.
patent: 4283944 (1981-08-01), Gruner et al.
patent: 4344322 (1982-08-01), Plapp
patent: 4468963 (1984-09-01), Schauble

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