What is the function of the air filter exhaust pipe
The exhaust pipe of the air filter is responsible for delivering the filtered air to the interior of the engine. It not only helps to reduce the noise generated during intake but also prevents wear and damage to the engine caused by impurities. The intake pipe plays a role in effectively filtering dust and impurities in the air, ensuring that the air entering the combustion chamber has a high purity, thereby guaranteeing the complete combustion of fuel. When the air filter element gets dirty due to contamination, it will impede the circulation of air, causing a decrease in the engine's intake volume and thereby affecting the engine's power output. In addition, the design of the air filter resonant cavity aims to reduce the intake noise of the engine. It is usually installed on the intake pipe and has two distinct cavities that are easy to identify.
In the field of automotive power plant technology, especially in the design of automotive air filters, noise reduction has become an important consideration factor. Background technology shows that noise has become a major problem affecting people's quality of life, and the automotive industry is no exception. While automakers are enhancing other performance aspects of their vehicles, they are also committed to improving the NVH performance of their cars. As the primary gateway for air to enter the engine, the air filter not only filters out dust from the air to protect the engine but also serves as an expansion muffler to reduce intake noise.
However, traditional air filter designs often adopt simple cavities and single circular pipes for air intake and exhaust, lacking cross-sectional variations, thereby limiting the increase in acoustic impedance and the improvement of noise reduction effects. Meanwhile, these air filters are usually installed on the battery and the front baffle by bolts. The rigidity of the installation points is relatively weak, and most designs fail to achieve effective intake noise reduction. Even though some designs take noise reduction into account and add resonant cavities to the intake pipe, doing so will occupy valuable engine compartment space and pose challenges to the layout.
In the patent of "An Air Filter with Integrated Resonant Cavity", although a resonant cavity is set inside the air filter to reduce noise, since the cross-section of the intake pipe remains unchanged, it is not conducive to further increasing the acoustic impedance to reduce noise. Furthermore, this design does not take into account the influence of vibration on the structural height. It has a large volume, which is not conducive to the layout of other accessories in the engine compartment and may also affect the stiffness of the installation point.
In response to these problems, the present invention proposes a structure of an automotive air filter that can improve the intake noise. This structure includes an upper shell and a lower shell. The lower shell is equipped with an intake chamber, a resonant chamber, a filtration chamber and an exhaust chamber. Air enters through the air inlet, passes through these chambers in sequence and is discharged through the air outlet. Notably, the intake chamber is designed as a pipe placed within the resonant cavity, with one end being the intake port and the other end having a connection hole connected to the resonant cavity. This design aims to more effectively reduce the intake noise.
Weakened power system performance: The air filter plays a crucial role in the engine, responsible for screening and purifying the air entering the engine. Once the air filter leaks, the amount of air flowing into the engine will decrease, thereby weakening the combustion efficiency and causing the engine's output power to decline.
Increased fuel consumption: Due to the reduction in the amount of air entering the engine, the density of the mixed gas will increase accordingly, which will cause incomplete combustion and subsequently lead to an accelerated rate of fuel consumption.
The quality of exhaust gas deteriorates: Incomplete combustion will cause the emissions of pollutants such as carbon monoxide and hydrocarbons in the exhaust gas to increase, having a negative impact on the environment.
Unstable engine operation: Air leakage from the air filter may cause insufficient air intake in the engine, interfering with its normal operation and potentially leading to stalling, unstable idling, and other conditions.
Reduced durability of components: Incomplete combustion will exacerbate the carbon deposit problem inside the engine, which will accelerate the wear of key components such as pistons and valves, thereby affecting their service life.
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