Air Flow Sensor-extended information

According to the different characteristics of 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 negative pressure of intake manifold and engine 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 acc