Temperature compensation in mass flow sensors employing the hot-

Details Temperature compensation in mass flow sensors employing the hot- Temperature compensation in mass flow sensors employing the hot-

1995-01-26

1997-08-12

Wieder, Kenenth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

7320419, 731182, G01F 168

Patent

active

056569386

ABSTRACT:
For determining the air mass flow in the intake pipe of an internal combustion engine by means of an electrical bridge, normally the current flowing through the current measurement resistor when balancing the bridge is evaluated as an indirect measure of the air mass flow. The primary measured quantity for the air mass flow is, however, the power converted at the air flow measurement resistor around which the air flows so that the indirect measurement always includes an error. To reduce this measurement error, the invention utilizes the evaluation of the sum of the voltage across the current measurement resistor and the voltage or a partial-voltage across the air flow measurement resistor as a measure of the air flow.

REFERENCES:
patent: 4938061 (1990-07-01), Carp
patent: 5020214 (1991-06-01), Tsuroka et al.

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