Air flow sensor
Used to determine the amount of air drawn into the engine cylinders. The output signal can be a linearly changing voltage or a changing frequency, depending on type and manufacturer.
Types:
- Volume air flow sensor;
- Hot element mass air flow sensor;
- Hot wire mass air flow sensor;
- Hot film mass air flow sensor;
- Karman vortex air flow sensor.
Output voltage waveform from a properly functioning volume air flow sensor based on the potentiometer (BMW 318 1.8i 1996). The waveform was recorded during snap throttle.
Output voltage waveform from a properly functioning mass air flow sensor. (Toyota Avensis 1.8i 2007).
Output voltage waveform from a properly functioning air flow sensor BOSCH HFM5 (Alfa 156 2.0i 2001). Snap throttle.
Moment of snap throttle.
Output voltage waveform from a properly functioning air flow sensor BOSCH HFM5. Moment of turning the ignition on.
Output voltage waveform from a properly functioning mass air flow sensor with a frequency output (Opel Vectra C 2.2i 2006). KOEO (Key On Engine Off).
The engine is at idle.