An active noise control system and control method for automobile exhaust system

Abstract

The invention relates to an active noise control system for an automobile exhaust system. The active noise control system comprises an exhaust pipe connected to an engine of an automobile, a three-way catalyst connected between the engine and a tail pipe of the exhaust pipe and a control system connected with the engine and the tail pipe respectively. The active noise control system further comprises an active muffler connected between the three-way catalyst and the tail pipe. The active muffler is provided with a vibration plate. A control signal output by the control system is transmitted to the active muffler and is used for controlling vibration of the vibration plate and generating reverse sound to eliminate medium-frequency and low-frequency noise. According to the active noise control system, the reverse sound is generated through vibration of the vibration plate in the active muffler, the problem that a loudspeaker of a traditional active muffler is poor in reliability and durability is solved, the muffling size and the weight of the exhaust system are further reduced, and combustion efficiency of the automobile is improved.

Description

technical field [0001] The invention belongs to the field of acoustics, and relates to an active noise control system for an automobile exhaust system and a control method thereof. Background technique [0002] During the running of the vehicle, noise is generated due to the continuously occurring working cycles of the internal combustion engine, in particular intake and compression of the fuel-air mixture, ignition / expansion and discharge of the combusted fuel-air mixture. These noises pass through the internal combustion engine as solid-borne sound and are emitted outside the internal combustion engine as airborne sound. Noise, on the other hand, is emitted as airborne sound through the exhaust system of the internal combustion engine together with the burning fuel-air mixture. [0003] These noises are often considered undesirable. The noise passing through the internal combustion engine as solid-borne sound is attenuated with high efficiency and therefore generally doe...

AI Technical Summary

Problems solved by technology

These present mufflers have the disadvantage that they require a large volume and impose a relatively high resistance to the burning fuel-air mixture where high damping efficiency is required

However, due to problems such as high temperature and easy corrosion inside the exhaust system, it is difficult to solve the reliability and durability of the speaker

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