Air flow measurement apparatus

Details Air flow measurement apparatus Air flow measurement apparatus

1979-08-09

1981-04-14

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Thermal type

73116, G01F 168

Patent

active

042611997

ABSTRACT:
An air flow measurement apparatus is proposed for measuring the air quantity aspirated by internal combustion engines, which has at least one temperature-dependent resistor disposed in the air flow, whose temperature and/or resistance is controlled in accordance with the flow rate to provide a controller output as a gauge for the quantity of the medium. The apparatus includes a flow restriction, which is preferably formed in plate-like configuration with a wedge-shaped cross section and the narraw tip facing into the air flow and is disposed in the flow downstream of the temperature-dependent resistor in such a manner that in the event of a flow reversal, such as during backfiring in the intake manifold of an internal combustion engine, the flow restriction reduces the flow velocity in the vicinity of the temperature-dependent resistor.

REFERENCES:
patent: 4089215 (1978-05-01), Chapin

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