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Overall description about MAF sensors
2024-11-06
A mass air flow (MAF) , a part of your vehicle’s electronic fuel injection system, is responsible for calculating the total amount of air entering the engine.The sensor for volume consumption of air is used in many systems for management of engines for detecting value of the transitory cost of air. Air consumption is the basic parameters for calculating the necessary amount of fuel. A Mass air flow sensor normally is installed after the air filter and before the throttle valve in the air flow is sucked into the engine.
Appearance
Do you know what your vehicle’s air flow sensor looks like? There are different types, size and design of mass air flow sensors, has various models depends on vehicle style.
Maybe you will think after seeing the appearance of sensors: It looks so small, how useful it can be? I will answer this for next time. Please don’t hurry and don’t go away!
Types of sensors
Hot wire : A metal wire (hot wire) made of platinum or tungsten is placed in the air flow path. When air flows through the hot wire, the hot wire cools down cause the air cooling affection, and the ECU monitors the change in the resistance of the hot wire because the resistance is directly related to the temperature. As the air flow increases, the hot wire cools more and the resistance decreases, and the ECU adjusts the fuel injection amount accordingly.
Hot film : The operation principle is similar to the hot wire type, but a film coated with a heat-sensitive material is used instead of a thin wire. Its structure is more solid and durable, but the cost is relatively high and the response speed is slightly slow.
Vane meter: It consists of an air flow meter and a potentiometer. The air drives the turbine blades to rotate, and the number of impeller revolutions is proportional to the volume of air passing through.
Optical Karman vortex: In the process of generating Karman vortex, the air pressure on both sides of the vortex generator changes, and the metal foil is vibrated through the guide hole. The output is demodulated to obtain a frequency signal representing the air flow rate.
Jxgertay sticks in manufacturing and developing hot wire air flow sensor, cause hot wire has a faster response speed and can respond rapidly the changes in air flow with high measurement accuracy, small intake resistance and no wear.
From the above description, it can be known the difference between various air flow sensor and have a comprehensive understanding in sensors.What else do you want to know, keep updating!
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