Sensor arrangement for measuring the mass of a flowing fluid

Details Sensor arrangement for measuring the mass of a flowing fluid Sensor arrangement for measuring the mass of a flowing fluid

1996-08-27

1998-10-06

Dombroske, George M.

Measuring and testing

Simulating operating condition

Marine

7320426, G01F 168

Patent

active

058179330

ABSTRACT:
A film sensor element is used to determine the mass of a flowing fluid, in particular an air mass flow in the intake tube of an internal combustion engine. Such a sensor is part of a measurement bridge and operates on the hot-wire anemometer principle, designed as a constant-resistance regulator connected to an operational amplifier. To reduce the response time, two separate resistance tracks of a film sensor element are structured in such a way that they are situated perpendicular to the direction of flow (S) with one track (6) along the leading edge and the other track (7) along the trailing edge. The tracks (6, 7) are electrically connected in parallel, such that the current can be divided according to the two resistance values as a current divider. Consequently, if the conductive track at the leading edge of the current divider cools to a greater extent this is counteracted by the rising current in the conductive track at the leading edge and thus greater electrical power is applied to the track at the leading edge. This is particularly advantageous in dual sensors for detecting the flow direction.

REFERENCES:
patent: 4542650 (1985-09-01), Renken et al.
patent: 4936145 (1990-06-01), Hohenstatt
patent: 5038610 (1991-08-01), Diehl et al.
patent: 5520047 (1996-05-01), Takahashi et al.
John G. Olin, "Split-Film Anemometer Sensors" Fluid Systems (Instruments and Control Systems) Journal of the Southern California Meter Association, Jun. 1970, pp. 106 to 108.
Technical Bulletin TB 20 TSI Split Film Sensor Calibration and Application, Thermo-Systems Inc., St. Paul Minnesota, 18 pages.
H. Strickert "Hitzdraht--und Hitzfilm-Anemometrie" 1974, Index and pp. 8 to 14; Section 1 pp. 16 to 25; Section 5 pp. 90 to 136; Section 6 pp. 137 to 173.

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