Neither design employs technology that measures air mass directly. These are the vane meter and the hot wire. There are two common types of mass airflow sensors in use on automotive engines.
In automotive applications, air density varies with the ambient temperature, altitude and the use of forced induction, which means that mass flow sensors are more appropriate than volumetric flow sensors for determining the quantity of intake air in each cylinder. Air changes its density with temperature and pressure. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. MAF sensor in a 2006-2015 automotive diesel engineĪ mass (air) flow sensor ( MAF) is a sensor used to determine the mass flow rate of air entering a fuel-injected internal combustion engine.
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