Expansion-ratio-variable silencing post-processor and vehicle using same

Abstract

The invention relates to an expansion-ratio-variable silencing post-processor and a vehicle using the same. The expansion-ratio-variable silencing post-processor comprises a cylinder body with a frontcover and a rear cover, the cylinder body is internally provided with an expansion cavity, the rear cover is provided with exhaust pipes communicating with the expansion cavity, the diameter of the exhaust pipes is smaller than the diameter of the expansion cavity, the two or more exhaust pipes are arranged, the cylinder body is further provided with a control valve for controlling at least one exhaust pipe to be opened or closed so as to adjust the expansion ratio between the exhaust pipes and the expansion cavity, the number of opened and closed exhaust pipes is controlled to enable the silencing post-processor to balance exhaust noise of various rotating speed working conditions, then the exhaust noise under various rotating speed working conditions reaches a lower level, and the purpose of enabling the exhaust noise to be reduced while various rotating speeds are considered is achieved.

Description

technical field [0001] The invention relates to a variable expansion ratio noise reduction post processor and a vehicle using the post processor. Background technique [0002] In recent years, with the improvement of people's living standards, the requirements for the comfort of passenger cars are getting higher and higher. The body of the passenger car is longer and the mass is larger, so it is generally matched with a diesel engine. Compared with a gasoline engine or other power sources, a diesel engine is more expensive The advantages are large output power and high thermal efficiency, but the disadvantage is that the low-frequency radiation noise is large. Since the diesel engine is used in an ultra-high temperature and harsh environment, this low-frequency noise can hardly be eliminated on the whole vehicle with conventional sound absorption and sound insulation methods. It must be Starting from the post-processor itself and intelligent control, the above-mentioned prob...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a variable expansion ratio noise reduction post-processor to solve the problem that the muffler in the prior art cannot meet the noise reduction requirements under different vehicle speeds; Vehicle with variable expansion ratio muffling afterprocessor

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