Air intake refers to the vehicleengineEntering the fresh air outsideflow。It is the entry of oxygen when the engine is working to ensure normal operation.The accurate estimation of cylinder intake under transient conditions is one of the effective measures to improve the control accuracy of engine air-fuel ratio.
First, brieflyAir filterThe air filters used in the engine can be divided into inertia type, filter type and integrated type, and can be divided into dry type and wet type according to whether the filter element material is immersed in oil.To be specific, the street cars that are widely used now are the world of paper dry air filters.Air filter: the most essential work and function is to filter the intake air to prevent the dust in the air from being sucked into the engine, so as to protect the engine, including other hot wire (membrane) air flow meters.Look carefully, the air filter itself is the contradictory republic of air inlet resistance and filtering efficiency. Indeed, it is easy to achieve low air inlet resistance, just reduce the number of media.However, it is impossible to guarantee high enough filtration efficiency (air filtration from TW is representative, hehe).No one will make fun of their own engines, but if it is just for the sake of filtering efficiency, it is easy to lose the air inlet resistance that tends to performance (the original air filter is representative).[1]
Technical issues
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High quality high flow air filter improves power:
Before that, we mainly discussed the application of street cars. Since it is a street car application, Donggutou is really not recommended. Regardless of the origin of Donggutou, what is the filtering efficiency????wait..The main reason is that most of the applications of Donggutou do not use the original air inlet box (if the original air inlet is used, pay attention to blocking the tiny air caused by each original channel), and the air inlet noise is relatively loud. At the same time,
Due to the loss of the harmonic supercharging effect of the original intake port and the inability to control the pulsation effect of the intake, the low intake resistance of the Donggutou will lead to the lower inflation efficiency and torque of the cylinder at low speed. It can also be said that after the torque is pushed, there will be a feeling of fatigue at low speed.
In addition, many of the current Donggutou products are made in Taiwan, so it is difficult to guarantee the filtering effect, which requires special care.
In contrast, the original installation position air filter still uses the original air inlet and gas collecting box, which can bring advantages while,
The disadvantages are minimized. The original air filter is more suitable for ordinary street cars, especially those driven in cities.
significance
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For EFI EFI vehiclesclosed-loop control It can be basically understood that the fuel injection volume and the air intake volume are basically matched (the same for AMP and AMF). A detailed analysis of the whole process of acceleration is actually a process of foot dropping the accelerator, in which the throttle is opened from one angle to another.Taking AMF as an example, in the same time, because the negative pressure changes in the air inlet pipe are basically the same, but because the use of air filter is different, the air inlet speed must be different. There is no doubt that the gas flow rate through KN high flow air filter is stronger than the original air filter, so in the same sense time, the gas center flow rate measured by AMF must be higher,High inflation efficiency, ECU will also match the fuel injection pulse for the signal measured by AMF, and the result is faster acceleration and sharper response.
The above is just a brief description of the reason for feeling after using high flow air filter.More reasons can be explored.[2]
