Measuring and testing – Volume or rate of flow – Thermal type
Patent
1980-02-04
1982-08-10
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
G01F 168
Patent
active
043431836
ABSTRACT:
An apparatus for measuring the flow of air through the air intake manifold of an internal combustion engine. A controller regulates current to a bridge circuit having a first temperature-dependent resistor which is disposed in the air flow within the manifold, and whose resistance is a function of the current flow therethrough and the flow rate and temperature of the air. A second fast-responding temperature-dependent resistor, which is disposed in the manifold and supplied with a very small current so that its resistance is essentially a function of the air temperature, provides an air temperature signal which is amplified and/or differentiated and supplied to the controller as a precise correction signal for the bridge diagonal voltage signal which is also an input signal to the controller, so that the current output of the controller is an accurate measure of the air flow.
REFERENCES:
patent: 2650496 (1953-09-01), Middleton et al.
patent: 2947938 (1960-08-01), Bennett
patent: 3085431 (1963-04-01), Yerman et al.
patent: 3429178 (1969-02-01), Durbin
patent: 3800592 (1974-04-01), Jones, Jr.
patent: 4233848 (1980-11-01), Sato
Goldstein Herbert
Greigg Edwin E.
Robert & Bosch GmbH
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