Look at a car like to see a person, if you do not know her life, do not know her character, how can you know she is not suitable for you, can you get her heart? If you are a Do not know the car's engine, how do you know this car does not save the province, the province is not fuel-efficient, really good to open it?
So today, the master talked to everyone about some of the engine's story. The key to designing the above three points is to see how this engine is sprayed, that is, our theme today, EFI and direct injection.
First of all, we know that the engine is powered by the combustion of fuel and air, and the combustion of the fuel is done in the engine cylinder, how does the fuel get into the cylinder?
The answer is: spray! Fuel is injected into the cylinder through the nozzle. And EFI and direct injection are the engine oil supply. EFI can be divided into single-point EFI and multi-point EFI, including single-point EFI Due to technical problems such as outdated almost can not see, and direct injection, also known as direct injection cylinder.
First, what is more direct injection it?
Multi-point EFI is the gasoline engine in the process of work, in the intake manifold by the control program in accordance with the specific timing control commands issued by the electronic injector to complete the injection. Each nozzle, more than one injection hole, it The fuel is injected directly into the intake manifold of each cylinder, and then into the corresponding combustion.
In simple terms, it means that the cylinder can be more 'stuffed' than the previous single-point direct injection, which means it's a bit 'having a good fight'.
Second, what is the direct injection of it?
This is a better understanding of the direct injection of the cylinder is to install the fuel nozzle in the cylinder, and then simply and crudely injected fuel into the cylinder and intake air mixing technology.
Compared to multi-point direct injection, it is equivalent to only one baby born, but sought to be extremely powerful no one kind of baby.
Third, both have their own advantages and disadvantages of it?
Multi-point direct injection is relatively old, the advantages of natural obvious, that is, the technology is more mature, the use of resistance, and maintenance are relatively cheaper for the oil requirements are not high, 92, 95 casually drink.
Of course, it is also compared to the shortcomings of direct injection is also very obvious, that is, fuel consumption is relatively high, the power is relatively meat.
In-cylinder direct injection is a relatively new technology, so its advantages and disadvantages are almost inverted with the former. Advantages compared to natural fuel efficiency is higher and fuller, more powerful, and emissions and fuel consumption is more Less and less.
Disadvantages are similar, with the former being inverted, which means higher manufacturing costs and more expensive repairs and therefore more likely to be installed on more expensive models. In addition, due to structural problems, the carbon deposits will be more More.
to sum up:
Now, we know the difference between EFI and direct injection, go look at your own car, what technology, you can understand why their car fuel consumption is like this.Although the advantages and disadvantages of direct injection in the cylinder more obvious, but Multi-point EFI is still widely used, because there are still many in-cylinder direct injection technology are not very mature, such as the recent increase in the number of oil not reduce the problem that some of the corresponding technology may not be perfect Cause
However, the advantages of direct injection cylinder is high pressure, good atomization, fuel injection accuracy, so the power output is good, lower fuel consumption and we currently apply the earliest and most mature of the public Volkswagen TSI, Audi TFSI , Universal SIDI, etc. In general, direct in-cylinder advantages are more pronounced.
