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A mass (air) flow sensor (MAF) is used to find out the mass flow rate of air entering a fuel-injected internal combustion engine.The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. 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. (See stoichiometry and ideal gas law.)There are two common types of mass airflow sensors in use on automotive engines.
These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's ECU can determine the mass flowrate of intake air.Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0.0–5.0 volt or a pulse-width modulation (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post OBDII vehicles. Vehicles prior to 1996 could have MAF without an IAT. An example is 1994 Infiniti Q45.When a MAF sensor is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop controller predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.
Also see MAP sensor. This article needs additional citations for. Unsourced material may be challenged and removed. (November 2009) A mass (air) flow sensor (MAF) is used to find out the of entering a.The air mass information is necessary for the (ECU) to balance and deliver the correct fuel mass to the engine.
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Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, varies with the ambient, and the use of, which means that mass flow sensors are more appropriate than sensors for determining the quantity of intake air in each cylinder.
(See and.)There are two common types of mass airflow sensors in use on automotive engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with additional sensors and inputs, an engine's ECU can determine the mass of intake air.Both approaches are used almost exclusively on (EFI) engines. Both sensor designs output a 0.0–5.0 volt or a (PWM) signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings for most post OBDII vehicles. Vehicles prior to 1996 could have MAF without an IAT.
An example is 1994 Infiniti Q45.When a MAF sensor is used in conjunction with an, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the predicted air flow information (the measured air flow) to the ECU, and the oxygen sensor provides feedback in order to make minor corrections to the predicted air mass.
During the past few years it’s generally been accepted that analog float type flow meters cannot always provide an accurate indication of performance when used in low flow rate applications. But now, thanks to R&D engineers from SMC, the world’s leading automation experts and their new Series PFM Digital Flow Switch using MEMS technology, this simply isn’t the case. Developed initially to detect microchip component adsorption in vacuum and early clogging in both filter and nozzle applications, the new Series PFM Flow Switch is incredibly compact and lightweight compared to existing flow sensors thanks to its micro electro mechanical system (MEMS) sensor.
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With its unique integrated flow adjustment valve, which can be added or disconnected by simply removing its retaining clip, linear flow rate can be adjusted manually by rotating the flow rate adjustment knob. During the past few years it’s generally been accepted that analog float type flow meters cannot always provide an accurate indication of performance when used in low flow rate applications. But now, thanks to R&D engineers from SMC, the world’s leading automation experts and their new Series PFM Digital Flow Switch using MEMS technology, this simply isn’t the case. Developed initially to detect microchip component adsorption in vacuum and early clogging in both filter and nozzle applications, the new Series PFM Flow Switch is incredibly compact and lightweight compared to existing flow sensors thanks to its micro electro mechanical system (MEMS) sensor. With its unique integrated flow adjustment valve, which can be added or disconnected by simply removing its retaining clip, linear flow rate can be adjusted manually by rotating the flow rate adjustment knob. During the past few years it’s generally been accepted that analog float type flow meters cannot always provide an accurate indication of performance when used in low flow rate applications.
But now, thanks to R&D engineers from SMC, the world’s leading automation experts and their new Series PFM Digital Flow Switch using MEMS technology, this simply isn’t the case. Developed initially to detect microchip component adsorption in vacuum and early clogging in both filter and nozzle applications, the new Series PFM Flow Switch is incredibly compact and lightweight compared to existing flow sensors thanks to its micro electro mechanical system (MEMS) sensor.
With its unique integrated flow adjustment valve, which can be added or disconnected by simply removing its retaining clip, linear flow rate can be adjusted manually by rotating the flow rate adjustment knob.
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