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What is the Function of an Automotive Mass Air Flow Sensor?

1 Answers

VonSophia

07/29/25 12:05pm

The function of an automotive mass air flow sensor is to measure the intake air volume of the engine and convert this information into electrical signals transmitted to the ECU. Below are the classifications of mass air flow sensors: 1. Vane-type mass air flow sensor: This type features simple structure and high reliability, but has a larger size, creates significant intake resistance, and exhibits slower response. 2. Karman vortex-type mass air flow sensor: When a cylindrical or triangular object is placed in a fluid, two columns of vortices rotating in opposite directions and alternating appear downstream of the object. 3. Optical Karman vortex mass air flow sensor: During the generation of Karman vortices, the air pressure on both sides of the vortex generator changes, acting on a metal foil through a guide hole to make it vibrate. When light from an LED shines on the vibrating metal foil, the light received by the phototransistor is modulated by the vortices. The output is demodulated to obtain a frequency signal representing the air flow rate. 4. Ultrasonic Karman vortex mass air flow sensor: Ultrasonic transmitting and receiving probes are installed opposite each other on both sides of the downstream pipe of the Karman vortex generator. Due to the effect of Karman vortices on air density, the time for ultrasonic waves to travel from the transmitting probe to the receiving probe becomes delayed compared to when there are no vortices, creating a phase difference. Processing this phase signal yields the vortex pulse signal.

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