For every consumer, although buying a car no longer needs to hurt the bones, it is still not a trivial matter. Therefore, consumers will consider all aspects of the performance of the car when buying a car, especially in the selection of the three major parts of the car. As far as the current market is concerned, the mainstream fuel injection device of the engine has two kinds of direct injection in the cylinder and multi-point electronic injection, but many consumers are not clear about the difference between the two injection methods, nor do they know how to choose when buying a car.
In the beginning, most cars were equipped with a carburetic injection device, which was very simple in structure, allowing gasoline to be sucked out of the air and begin to atomize as it flowed through the nozzle, and then fed into the engine for work. However, this fuel injection device will obviously lead to incomplete combustion of gasoline, increased fuel consumption of vehicles, and extremely poor cold resistance, which also makes many car owners feel very annoyed.
In this environment, major car companies have accelerated their research and development speed for fuel injection devices, multi-point E-injection and in-cylinder direct injection devices began to appear on the market, and quickly replaced the old models equipped with carburetic fuel injection devices, becoming the mainstream of the current automotive market.
Features of multi-point EFI
Multi-point EFI appeared earlier, so the technology is more mature. In contrast to carburetors, multi-point EFI works by mixing the air outside the engine cylinder and gasoline in a certain proportion, and then feeding it into the engine for combustion. This mixture of gases due to the high oxygen content, all combustion is also relatively sufficient, incomplete combustion rarely occurs, coupled with the multi-point EFI device in the work will be in the intake tract and the back of the intake valve wash, so the serious carbon deposition of the engine can also be alleviated to a certain extent.
On the other hand, the disadvantages of multi-point EFI are also very obvious, that is, the fuel economy is not strong, and it is impossible to better reduce the fuel consumption of the car. This is due to the limitations of multi-point EFI in terms of oil-gas mixing and fuel atomization, and the structure of multi-point EFI determines that it cannot make the oil-gas mixture burn in layers, and the amount of fuel injection is not precise enough, so it cannot improve fuel economy. On the other hand, multi-point EFI devices will also limit the performance of the engine and reduce the compression ratio of the engine.
Characteristics of direct injection in the cylinder
In order to solve a series of problems in multi-point EFI, the direct injection device in the cylinder has been adopted by the R & D personnel of major car companies. For the first time ever, the in-cylinder direct injection device has directly installed the injector in the cylinder, allowing the mixing of gasoline and air to occur in the cylinder. In this way, the fuel economy and engine power provided by the direct injection device in the cylinder are also improved, and the degree of fuel atomization is more complete, which effectively reduces the fuel consumption of the car.
Unfortunately, direct injection in the cylinder is not the ultimate solution for car engines. Because of the lack of multi-point EFI injection process, so the cylinder direct injection can easily cause the problem of increasing car carbon deposits, in addition, the direct injection in the cylinder produces more toxic and harmful gases, especially when the cold car starts more obviously.
summary:
For the vast majority of car owners, perhaps the hybrid injection device is their optimal solution, this hybrid injection device combines all the advantages of direct injection in the cylinder and multi-point electric injection, so that the car can also have a good performance in cold start, while the serious situation of carbon deposition has also been alleviated, and the fuel economy has been improved to a certain extent.