Temperature sensing flow sensor

Details Temperature sensing flow sensor Temperature sensing flow sensor

1989-02-27

1990-06-19

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

731182, 7320415, 7320418, G01F 168

Patent

active

049341880

ABSTRACT:
A temperature sensing type flow sensor including a control pulse generating circuit for generating a pulse signal having a time ratio which corresponds to the output from a bridge circuit which contains temperature sensing elements, an intermittent control circuit for controlling a time in which an current is conducted in accordance with the time ratio, and a smoothing circuit for making an noncontinuous output from the intermittent control circuit continuous as supplied to the bridge circuit. The responsiveness of this temperature sensing type flow sensor is improved, and the change of the temperature sensing type elements due to time elapse and power source loss can be reduced. Furthermore, a switching control type temperature sensing flow sensor exhibits the most suitable frequency response throughout a significantly wide frequency region.

REFERENCES:
patent: 4043195 (1977-08-01), Hunting
patent: 4334186 (1982-06-01), Sasayama et al.
patent: 4753111 (1988-06-01), Caron et al.
patent: 4794795 (1989-01-01), Djorup
Sauer, Rudolf et al., Hot Wire Air Mass Meter-a New Air Flow Meter for Gasoline Fuel Injection Systems, Society of Automotive Engineers, Inc., No. 800468.

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