What is the working principle of an air flow meter?

[DeKyle]

Air flow meter works by maintaining a constant voltage, while the intake air volume changes the resistance of the air flow meter, thereby altering the current, which is then transmitted to the vehicle's ECU. The air flow sensor, also known as the air flow meter, is one of the key sensors in an electronic fuel injection engine. It converts the intake air flow into an electrical signal and sends it to the ECU as one of the fundamental signals for determining fuel injection. It is a sensor that measures the air flow entering the engine. With the introduction of microcomputers for fuel injection control, several other types of air flow sensors have emerged, such as the vane-type air flow sensor and the Karman vortex air flow sensor.