How much do you know about the function of automobile air flowmeter?

Vehicle air flowmeter is a kind of sensor to calculate the intake air volume of engine by developing precision components. In the electronically controlled fuel injection system of automobile, the air flowmeter is one of the important components that affect the control accuracy of the system. Meanwhile, the gas volume signal and the engine speed signal are used as reference signals for fuel injection timing. According to the characteristics of the air flow meter sensor, the fuel control system can be divided into L control which directly measures the intake air volume and D control which indirectly measures the intake air volume. The original electronic fuel injection control system used analog circuit instead of microcomputer, but at that time it used valve air flow sensor.

Its main function is to measure the speed signal, but because there was no electronic fuel injection control system at that time, the performance of this sensor can not meet the needs of today. In World War II, the Germans successfully manufactured a new type of electronic fuel injector for measuring the air intake of the engine, which can directly connect the air flow sensor with the engine speed signal, thus measuring the air intake required by the engine and effectively controlling the engine. Since 1945, many countries have done a lot of research on electronic fuel injection control technology and invested a lot of money to develop electronic fuel injection systems. ?

The rapid development of vehicle air flowmeter was the basis for the great progress of electronic fuel injection technology at that time, which laid a solid foundation for the development of electronically controlled gasoline injection system. Compared with electronic fuel injection controller, electromagnetic fuel injector is more accurate, efficient, reliable and easy to install. ?

When the intake valve of the vehicle air flowmeter is in the open state, the electromagnetic fuel injector works under the control of electromagnetic pulse signal, and the fuel enters the fuel injector through the gasoline filter and nozzle, forming negative pressure on the fuel injector. Fuel enters the cylinder through the gasoline filter and nozzle, forming a positive pressure on the cylinder, and fuel enters the injector through the gasoline filter and nozzle, forming a negative pressure on the injector. ?