It converts the inhaled air flow into an electric signal and sends it to the electronic control unit (ECU). As one of the basic signals for determining fuel injection, it is a sensor that measures the air flow into the engine. The air flow sensor, also known as an air flow meter, is One of the important sensors of EFI engine.
There are many types of air flow sensors for electronically controlled gasoline injection systems. According to their structure, common air flow sensors can be divided into blade (wing plate) type, core type, hot wire type, hot film type, Karman scroll type, etc. kind.
According to the different characteristics of the air flow sensor, the fuel control system is divided into L-type control for direct measurement of intake air volume and D-type control for indirect measurement of intake air volume according to the measurement method of intake air volume. The speed indirectly measures the intake air volume. In the microcomputer ROM in the D-type control method, the amount of intake air under various conditions with the engine speed and the pressure in the intake pipe as parameters is stored in advance.
According to the measured intake pressure and speed in each operating state, the microcomputer can calculate the fuel quantity with reference to the intake quantity stored in the ROM. The air flow meter used for the L-type control is basically the same as the general industrial flow sensor, but when the accelerator is stepped The response to the sudden change in the flow rate and the requirement that the uneven air flow caused by the shape of the intake manifold before and after the sensor can be detected with high accuracy.
Post time: Nov-15-2021