Simulator stand for exhaust characteristics of vehicle engine

Abstract

The invention relates to a simulator stand for exhaust characteristics of a vehicle engine and belongs to environment simulation testing devices. The simulator stand comprises a gas source, an intake testing section, a heating section, a pulse section, a noise section and an outlet testing section. The gas source, the intake testing section, the heating section, the pulse section, the noise section and the outlet testing section are connected with a flange through a pipeline sequentially. The simulator stand can be used for comprehensive simulation of exhaust flow rate, temperature, pulse and noise of the vehicle engine and is suitable for match test of silencers of various types of engines different in displacement. A noise source required for testing is provided by combining a pulse generator and a loudspeaker, the pulse generator is used for producing high-strength low-frequency sounds, the loudspeaker is used for producing high-frequency order sounds and white noise, and the exhaust flow rate, temperature, pulse strength and pulse frequency can be controlled independently and quantitatively.

Description

technical field [0001] The invention relates to a vehicle engine exhaust characteristic simulation test bench, which is used for simulating the exhaust characteristics of the vehicle engine under different working conditions, and belongs to environmental simulation test equipment. Background technique [0002] With the rapid growth of car ownership and people's increasing concern for environmental issues, countries all over the world have included car noise indicators into the scope of compulsory assessment, and clearly stipulated motor vehicle noise limits. The exhaust noise of the vehicle engine accounts for a very large proportion of the vehicle noise, even 10~15dB(A) higher than the engine body noise. For this reason, the exhaust noise of the engine is generally reduced by adding an exhaust muffler to achieve the purpose of noise reduction. At present, the design of exhaust mufflers at home and abroad is still based on empirical design, after a multi-round cycle process...

AI Technical Summary

Problems solved by technology

[0004] Among the existing similar test platforms, the function of the relevant test platforms is to provide a simple noise source for the muffler matching test. The design goal of the test platform is not to restore the exhaust state of the engine, and it cannot accurately and quantitatively simulate the exhaust of the engine. surroundings

Some test devices can only simply simulate the engine exhaust in a cold state, such as Cai Chao et al. The design and research of the platform, Shandong Machinery, No. 2, 1998) none of the test platforms designed can simulate the engine exhaust in the hot state; some platforms cannot simulate the exhaust pulsation phenomenon of the vehicle engine, such as Ruan Dengfang et al. Development and Application of Test Device, Internal Combustion Engine Engineering, Issue 4, 2004) The "Internal Combustion Engine Muffler Characteristic Test Device" designed can provide stable high-temperature gas and white noise, but cannot simulate exhaust pulsation

Due to the large difference between the test environment and the actual engine working state, the existing simulation test bench is limited in application

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