Measurement probe

Details Measurement probe Measurement probe

1987-03-03

1989-05-23

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

7320426, G01F 168

Patent

active

048318760

ABSTRACT:
In a measurement probe for measuring the mass of a flowing fluid, particularly the intake air of an internal-combustion engine, having at least one temperature-dependent first resistor which is arranged in the flow of the fluid and is part of a bridge circuit and the temperature and/or resistance of which is controlled as a function of the flowing mass, the actuating variable being a measure of the mass of the flowing fluid, a second resistor which is connected in parallel to the bridge circuit is arranged in the fluid downstream of the first resistor. In this way, the probe is directionally sensitive. Erroneous measurements by reverse flow are avoided. Furthermore, a third resistor, which is also part of the bridge circuit and is connected in series with the first resistor, can be arranged upstream in front of the first resistor directly in the fluid. This contributes to reducing the response time.

REFERENCES:
patent: 4080821 (1978-03-01), Johnston
patent: 4276773 (1981-07-01), Kawai et al.
patent: 4322970 (1982-04-01), Peter
patent: 4468963 (1984-09-01), Schauble
patent: 4566320 (1986-01-01), Bohrer
patent: 4587842 (1986-05-01), Handtmann
patent: 4633578 (1987-01-01), Aine et al.
patent: 4688424 (1987-08-01), Handtmann

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