Take the gasoline engine's working principle, for every cylinder to provide 1 kilograms of gasoline, it needs about 15 kilograms of air inhaled by the cylinder, so as to ensure the full combustion of gasoline. However, the volume of the 15 kilograms of air will be very large. It is not easy to breathe in such a large volume of air just by the vacuum generated by the cylinder during the intake process of the engine. Therefore, it is particularly important to improve the ability of the engine to inhale gas, which is to improve the efficiency of the engine. There are two ways to increase the air intake of the engine, the first one is after the two-stage supercharging technology, in principle, after the two-stage supercharging technology is the use of special gas compressor will be pre compressed before it enters the cylinder, improve the density of gas into the cylinder, reducing gas volume, thus, in the unit volume the quality of the gas, will greatly increase the air intake, fuel combustion can meet the needs, so as to achieve the purpose of improving the power of the engine. The compressor used in the process of turbocharging is also called a supercharger. The second is the front air intake technology, or the use of the vacuum degree of the cylinder, from the intake pipe to add air into the cylinder. No matter which technology is, it is the key to control the intake volume.