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Method for improving DPF acoustic performance

A technology of acoustic performance and DPF, applied in mechanical equipment, engine components, machines/engines, etc., can solve the problem of not obvious effect, and achieve the effect of improving acoustic performance, large transmission loss, and realizing low-noise design

Inactive Publication Date: 2016-07-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the shape of the channels of popular DPFs on the market is generally square, and the air intake and exhaust channels are squares with equal side lengths. This structure has a certain noise reduction effect on the exhaust system while trapping particulate matter, but Its effect is not very obvious

Method used

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  • Method for improving DPF acoustic performance
  • Method for improving DPF acoustic performance
  • Method for improving DPF acoustic performance

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Such as figure 1 and figure 2 As shown, in the first embodiment, the air intake channel of the DPF is set as a regular octagon, and the exhaust channel is set as a square, and the outlet of the air intake channel and the inlet of the exhaust channel are all blocked, wherein the air intake channel and the exhaust channel are blocked. The side length of the exhaust hole is 1 mm, and the wall thickness of the filter layer between the air intake hole and the exhaust hole is 0.55 mm. The flow of gas enters from the regular octagonal channel, passes through the porous medium, and exits from the square channel.

[0027] Such as image 3 and Figure 4 As shown, through the simulation analysis of the acoustic analysis software Virtual.LabAcoustics, it can be known that this design of the inlet and outlet square channels can make the maximum transmission loss of the DPF 21.2dB, the maximum insertion loss peak appears at 2800Hz, and the maximum insertion loss is 38dB, which ca...

Embodiment 2

[0029] Such as Figure 5 and Figure 6 As shown, in the second embodiment, the air inlet and exhaust holes of the DPF are both set to a square, and the square side length of the air inlet hole is greater than the square side length of the exhaust hole, and the outlet of the air inlet hole and the exhaust hole The inlets are all blocked, wherein the side length of the air inlet channel is 1.5mm, the side length of the exhaust channel is 1mm, and the wall thickness of the filter layer between the air inlet channel and the exhaust channel is 0.55mm. The flow of gas will enter from the large square channel, pass through the porous medium, and exit from the small square channel.

[0030] Such as Figure 7 and Figure 8 As shown, through the simulation analysis of the acoustic analysis software Virtual.LabAcoustics, it can be known that this asymmetrical square channel design can make the maximum transmission loss of DPF 21.2dB, the maximum insertion loss peak appears at 3000Hz, ...

Embodiment 3

[0032] Such as Figure 9 and Figure 10 As shown, in the third embodiment, the inlet hole and the exhaust hole of the DPF are set to be circular in size, and the outlet of the inlet hole and the inlet of the exhaust hole are all blocked, wherein the inlet hole and the exhaust hole The diameters of the pores are all 1.8 mm, and the shortest distance between adjacent round holes is 0.55 mm. Both the inlet and exhaust holes of the DPF are designed as circular holes. For any circular hole, if it is an air inlet, then the four adjacent circular holes are exhaust holes. The flow of gas enters from a circular channel, passes through the porous medium, and exits from another adjacent circular channel.

[0033] Such as Figure 11 and Figure 12 As shown, through the simulation analysis of the acoustic analysis software Virtual.LabAcoustics, it can be known that this circular channel design can make the maximum transmission loss of the DPF 20.5dB, the maximum insertion loss peak app...

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Abstract

The invention relates to a method for improving DPF acoustic performance. According to the method, the contact area between sound waves and an inner wall is enlarged by changing the shapes of a gas inlet duct and an exhaust duct, the transmission loss of the sound waves is larger than the existing transmission loss, and the insertion loss of the sound waves is larger than the existing insertion loss, noise of an exhaust system is reduced, the DPF acoustic performance is improved, and the low-noise design of a DPF is achieved.

Description

technical field [0001] The invention belongs to the technical field of exhaust aftertreatment of internal combustion engines, and in particular relates to a method for improving the acoustic performance of a DPF. Background technique [0002] Aiming at the current situation of energy shortage and sustainable development, light-duty diesel vehicles have attracted more and more attention from the society due to their good fuel economy, and have been widely used in the field of transportation. The diesel particulate filter technology is the most effective means to reduce the emission of diesel particulate matter and realize the cleanliness of diesel vehicles. [0003] Diesel Particulate Filter (DPF) filter body has many honeycomb-like pores. Among the two adjacent channels, one inlet is blocked and the other outlet is blocked, so that the engine exhaust must enter from one channel and pass through the pores. The medium is discharged from another channel. A filter body is fill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/021F01N1/00
CPCF01N3/021F01N1/00F01N2470/00F01N2470/10
Inventor 侯献军莫丽蓉刘志恩杨良凯
Owner WUHAN UNIV OF TECH