Main components of automobile engine gas supply system

The function of the air supply system is to provide the necessary air for the formation of the engine combustible mixture, and to measure and control the amount of air required for fuel combustion. Air enters the intake manifold through the air cleaner, air flow meter and throttle body, and then is distributed to the intake manifold of each cylinder. In the intake manifold (or at the intake valve), the air is mixed with the fuel sprayed by the injector and then sucked into the cylinder for combustion.

(1) The air filter is used to filter out the dust contained in the air, thus reducing the wear of the cylinder, piston, piston ring and other parts and prolonging the service life of the engine.

(2) The throttle body is a throttle component installed to adjust and control the air sucked into the engine. The throttle body is mainly composed of throttle, throttle position sensor for detecting the opening and closing state of throttle, throttle positioning potentiometer, throttle positioner (motor), throttle potentiometer and idle switch. When the car is running normally, the airflow is controlled by the throttle, and the throttle is controlled by the driver through the accelerator pedal.

(3) The function of the intake manifold is to introduce air or combustible mixture into the cylinders, so as to ensure sufficient intake air and even intake air in each cylinder. The intake manifold is mostly made of aluminum alloy or cast iron, and some of them are made of composite plastic. There is also a surge tank (also called * * cavity and resonant cavity) in front of the intake manifold of some cars, which is used to eliminate the intake pressure pulsation and ensure the uniform distribution of mixed gas in each cylinder.