(1) Current gasoline engines do not generally use in-cylinder direct injection
(2) Reasons: There are only a handful of domestically produced and joint venture vehicles with direct injection in the cylinder, mainly including Most of Volkswagen's models still use multi-point fuel injection technology, but in recent years, major manufacturers have introduced engines with direct injection in the cylinder.
Cylinder direct injection (FSI) refers to:
(1) Technology that directly injects fuel into the cylinder to mix with the intake air. The advantages are low fuel consumption, high power per liter, and a compression ratio as high as 12. Compared with ordinary engines of the same displacement, the power and torque are increased by 10.
(2) The current disadvantage is that the components are complex and usually expensive.
Advantages of in-cylinder direct injection:
(1) The advantages of in-cylinder direct injection gasoline engines are low fuel consumption and high power per liter.
(2) The air-fuel ratio reaches 40:1 (the air-fuel ratio of a general gasoline engine is 15:1), which is what people call "lean combustion".
(3) Half of the top of the piston in the machine is spherical, and the other half is a wall. After the air rushes in from the valve, it forms a vortex motion under the compression of the piston. When the compression stroke is about to end, the combustion The fuel injector at the top of the chamber begins to inject fuel, and gasoline and air form a mixture under the action of vortex motion. This rapidly rotating mixture is layered, and the closer it is to the spark plug, the richer it becomes, making it easier to ignite and work.
(4) The compression ratio is as high as 12, and the power and torque are increased by 10 compared with ordinary engines of the same displacement.