Turbo supercharged engine air inlet system noise reduction structure

Abstract

The invention discloses a turbo supercharged engine air inlet system noise reduction structure. The structure comprises an air filter assembly, a turbosupercharger and an electronic pressure relief valve. An air filter air outlet pipe of the air filter assembly is communicated with the turbosupercharger, a pressure relief air inlet pipe of the electronic pressure relief valve is communicated with a supercharged air outlet pipe of the turbosupercharger, a hollow inner inserting pipe is arranged on the air filter assembly, at least part of the inner inserting pipe is located in the air filter assembly, through holes are distributed in the side wall of the part of the inner inserting pipe, and a pressure relief air outlet pipe of the electronic pressure relief valve is communicated with the inner inserting pipe. By the adoption of the above structure, air from the pressure relief air outlet pipe enters the air filter assembly, the air is weakened through the inner inserting pipe, then, the air enters a filter cavity to be filtered, and continuously passes through a circulation booster loop, the howlround loop is weakened, NVH influences brought by air cycle of a supercharged engine air inlet system are avoided, and car comfort is improved.

Description

technical field [0001] The invention belongs to the technical field of automobile engines, and in particular relates to a noise reduction structure of a turbocharged engine intake system. Background technique [0002] When the traditional car engine is working, once the driver releases the pedal, the ECU will send a control signal to close the throttle valve and reduce the speed of the turbocharger through the waste gas valve. It takes 70 to 130ms to close the throttle. For example, at 800mbar boost pressure, the pressure peak could be an additional 600mbar. At the same time, the wastegate begins to slow down the turbocharger. If there is no bypass, the pressure must be reduced through the internal resistance of the compressor. In this case, the time required to fully reduce the pressure may exceed 1000ms, and the turbocharger will "surge", usually using an electronic pressure relief valve. The boost air in the turbocharger compressor is recirculated from the compressor r...

AI Technical Summary

Problems solved by technology

If there is no bypass, the pressure must be reduced through the internal resistance of the compressor. In this case, the time required to fully reduce the pressure may exceed 1000ms, and the turbocharger will "surge", usually using an electronic pressure relief valve. The boost air in the turbocharger compressor is recirculated from the compressor rear end and sent back to the compressor inlet pipe side, thereby quickly reducing the boost pressure during engine surge and shifting, forming a loop, but because When the gas passes through the electronic pressure relief valve, the diameter of the pipe changes from large to small, resulting in a sharp change in pressure, which will cause pressure relief whistle and increase the NVH problem of the car

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