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An 'air flow meter', also know as air consumption meter, is a device that measures how much air is flowing through a tube.
It does not measure the volume of the air passing through the tube, it measures the amount of mass flowing through the device in a defined time segment.
So, an air flow meter is just an application of mass flow meters for a special medium.
The typical physical value is kg/h.

Contents

Types of air flow meters

Air flow meter in cars

See also

External Links

Types of air flow meters

Air flow meter in cars

An air flow meter is used in some cars to measure the quantity of air going to the engine. The electronic control unit then calculates how much fuel is needed to inject into the intake manifold.
NOTE - the VANE type air flow meters (early Bosch L-Jetronic EFI) actually
★ do
★ measure air volume, whereas the later "hot wire" air flow meters measure mass flow. (Cite ?)
The flap type meter includes a spring which returns the internal flap to the initial position. Sometimes if the spring is tensioned too tight it would make a restriction to the incoming air and it would cause the intake air speed to increase when not opened fully.
===Air flow meter for R&D of cars===
In the development process of combustion engines with engine test stands an air flow meter/air flow measuring unit is used for measuring the continuous gravimetric air consumption of combustion engines.

See also

★ air flow bench (aviation)

★ Mass airflow sensor

External Links

★ Air Flow Meter

★ Compendium for most major manufacturers of Air Flow Meters