Active noise reduction system and method for engine in automobile

An active noise reduction and engine technology, applied in engine components, machines/engines, mechanical equipment, etc., can solve problems such as unsatisfactory active noise reduction effects, improve convergence speed and stability, reduce low-frequency noise, and enhance noise reduction. effect of effect

Active Publication Date: 2016-11-09
HEFEI CHANGAN AUTOMOBILE +1
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[0005] The purpose of the present invention is to provide an active noise reduction system and method for an i

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  • Active noise reduction system and method for engine in automobile
  • Active noise reduction system and method for engine in automobile
  • Active noise reduction system and method for engine in automobile

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] According to the linear superposition principle of the sound field of Young's interference theory, when the sound waves with the same frequency and constant phase difference will produce additive or destructive interference after superposition, the sound energy will be enhanced or weakened. The main frequency of the low-frequency noise caused by most engines is directly related to the engine's own speed, so the sound wave with the same frequency, equal amplitude and opposite phase as the engine noise can be generated by collecting the engine speed characteristics, which can offset the low-frequency noise of the engine.

[0034] An active noise reduction system for an in-vehicle engine includes two error microphones, five secondary sound source speakers, and an adaptive active controller. The layout of the original components of this system: there...

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Abstract

The invention relates to an active noise reduction system for an engine in an automobile. The system comprises two error microphones, five secondary sound source loudspeakers and one self-adaptation active controller. The two error microphones are arranged at automobile roof positions corresponding to a front row and a back row of the automobile. The five secondary sound source loudspeakers are composed of four vehicle-mounted loudspeaker boxes arranged on the automobile door sides and one secondary sound source arranged at the position of a rear row partition plate. The self-adaptation active controller comprises a DSP master control chip, an audio decoding chip, an off-chip storage unit, a CAN bus controller, a power amplifier, an error microphone signal receiving module, a secondary sound source output module and a power module. The invention further relates to an active noise reduction method for the engine in the automobile. By means of the system and method, error noise signals in active noise reduction reach the minimum value during constant noise reduction control, the noise influence caused by the error noise signals can be basically ignored, and the expected noise reduction effect can be rapidly achieved.

Description

technical field [0001] The invention relates to automobile noise reduction technology, in particular to an engine active noise reduction system and method in a car. Background technique [0002] Recently, noise control in automobiles mainly adopts traditional passive noise reduction technologies such as sound insulation, vibration isolation, noise elimination, and sound absorption. These technologies are effective in reducing medium and high-frequency noise in cars, but for Low frequency noise is less than ideal. Active noise reduction technology has attracted people's attention because of its ability to effectively reduce low-frequency noise, and has been gradually applied in reducing low-frequency noise. The principle of active noise reduction is to generate a new sound source signal with the opposite polarity and equal intensity to the source noise through an electro-acoustic system, and use this signal to superimpose the source noise signal to realize the cancellation o...

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Application Information

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IPC IPC(8): F01N1/06
CPCF01N1/065
Inventor 王辉杨宪武徐小敏李宏成王兰军唐禹
Owner HEFEI CHANGAN AUTOMOBILE
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