Air Flow Meters, Air Flow Sensors
A mass air flow meter or sensor is utilized to measure the mass of air that enters a fuel-injected internal combustion engine. The engine control unit uses this information to determine how much fuel to inject into the chambers. A constant measurement of air flow, pressure, and temperature is needed to calculate the proper amounts of fuel for optimal performance. Air expands and contracts depending upon the pressure and temperature it is exposed to. The current mass of the air flowing in will affect how much fuel is needed to create the right amount of power. Air flow meters/sensors work together with other sensors to distinguish the mass of the air. Turbocharged engines are where air flow sensors are used the most. Meters are available in two types, hot wire and vane meter. A vane meter uses a spring loaded arm that moves with the air flow, and hot wire is cooled as air flows past it.