ilmamäärämittarin

Ilmamäärämittari, also known as an air flow meter or mass air flow sensor (MAF sensor), is a device used in internal combustion engines to measure the amount of air entering the engine. This measurement is crucial for the engine control unit (ECU) to determine the correct amount of fuel to inject, ensuring optimal combustion and fuel efficiency.

There are several types of ilmamäärämittarit, with the most common being hot-wire and hot-film sensors. A hot-wire sensor uses a heated wire that is cooled by the incoming air. The amount of cooling is directly related to the mass of the air. A hot-film sensor works on a similar principle but uses a heated film instead of a wire. The ECU monitors the change in resistance or voltage generated by these sensors to calculate the air mass.

The data provided by the ilmamäärämittari is essential for various engine functions, including idle speed control, fuel injection timing, and ignition timing. A faulty or dirty sensor can lead to a range of performance issues, such as rough idling, poor acceleration, increased fuel consumption, and illuminated check engine lights. Regular maintenance and cleaning can help ensure the accurate functioning of this vital engine component.