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The hot film MAF sensor works somewhat similar to the hot wire MAF sensor, but instead it usually outputs a frequency signal. This sensor uses a hot film-grid instead of a hot wire. [3] It is commonly found in late 1980s and early 1990s fuel-injected vehicles. The output frequency is directly proportional to the air mass entering the engine.
This requires the use of an alternative method of calculating airflow into the engine, which is also referred to as 'Speed-Density' system, as opposed to a MAF system. On vehicles so equipped, this alternative involves the use of a manifold absolute pressure, or MAP, sensor. The MAP sensor measures pressure in the engine's inlet manifold.
"Compacted Graphite Iron – a material solution for modern diesel engine cylinder blocks and heads" (PDF). FoundryInfo-India.org. SinterCast, Sweden. February 2008. p. 3 of 7 (95). Archived from the original (PDF) on 26 July 2011 "Boat engines from Volkswagen Marine - Self-study programme M002 - Design and Operation" (PDF).
It is a one-to-one relationship with an offset of -100 kPa for boost pressure. Thus, a MAP sensor will always read 100 kPa more than a boost sensor measuring the same conditions. A MAP sensor will never display a negative reading because it is measuring absolute pressure, where zero is the total absence of pressure.
In many late model automobiles, a Mass Airflow (MAF) sensor is used to accurately determine the mass flow rate of intake air used in the internal combustion engine. Many such mass flow sensors use a heated element and a downstream temperature sensor to indicate the air flowrate. Other sensors use a spring-loaded vane.
Typically, mass air flow measurements are expressed in the units of kilograms per second (kg/s) or feet per minute (fpm), which can be converted to volume measurements of cubic metres per second (cumecs) [1] or cubic feet per minute (cfm).
Air is drawn into the engine through two air filters located above each cylinder head. The amount of the air is measured by two hot film mass air flow sensors B2/6&7. On Sprinter models, a single air filter housing is mounted upon brackets on top of the engine. OM642 VGT low boost position
Download as PDF; Printable version; In other projects ... Mass air flow sensor 0 2047.96875 g/s [A0]== Sensor A Supported ... SAE International. 2017-02-16.