How does the MAF sensor influence metering?

How does the MAF sensor influence metering?

• A. It senses engine oil pressure.
• B. It directly measures fuel temperature.
• C. It estimates air mass entering the engine to adjust fueling.
• D. It provides an estimate of air mass entering the engine, which the ECU uses to compute required fuel quantity.

Answer: (D)

The essential idea is that fuel metering is driven by how much air is entering the engine. The MAF sensor measures the mass flow of air, typically in real time, and that information is sent to the engine computer. The ECU uses this data, along with other inputs like RPM and temperature, to determine how much fuel to inject in that cycle so the air–fuel ratio stays at the target value. In other words, when the MAF reports more air coming in, the ECU increases the fuel quantity; when it reports less air, it reduces it. This data is then refined by feedback from the oxygen sensor to fine-tune the mixture. That’s why the statement that the MAF provides an air-mass estimate that the ECU uses to compute the required fuel quantity best captures how metering is controlled.

The essential idea is that fuel metering is driven by how much air is entering the engine. The MAF sensor measures the mass flow of air, typically in real time, and that information is sent to the engine computer. The ECU uses this data, along with other inputs like RPM and temperature, to determine how much fuel to inject in that cycle so the air–fuel ratio stays at the target value. In other words, when the MAF reports more air coming in, the ECU increases the fuel quantity; when it reports less air, it reduces it. This data is then refined by feedback from the oxygen sensor to fine-tune the mixture. That’s why the statement that the MAF provides an air-mass estimate that the ECU uses to compute the required fuel quantity best captures how metering is controlled.