New energy vehicle and its active noise reduction method and system

Abstract

A new energy vehicle, and an active noise reduction method and system thereof. The method comprises: acquiring operating parameters of a new energy vehicle, and obtaining, according to the operating parameters, the frequency of an in-vehicle ambient noise signal associated with the operating parameters (S101), wherein the operating parameters comprise at least a motor rotating speed of the new energy vehicle, and the motor rotational speed corresponds to the frequency of the in-vehicle ambient noise signal; searching, according to the frequency of the in-vehicle ambient noise signal, a preconfigured generated-sound database to obtain a generated-sound signal corresponding to the in-vehicle ambient noise signal (S102); and controlling a sound playback module in the new energy vehicle to output the generated-sound signal, wherein the generated-sound signal is combined with the in-vehicle ambient noise signal to reduce noise in an in-vehicle environment (S103). The active noise reduction method is easily implemented and operated and is easily used by a user.

Description

technical field [0001] The invention relates to the technical field of noise control, in particular to an active noise reduction method for a new energy vehicle, an active noise reduction system for a new energy vehicle and a new energy vehicle. Background technique [0002] The sound quality problem has become a new NVH (Noise Vibration and Harshness) problem in the automotive industry, especially for new energy vehicles, the sound quality problem is more important, because without the masking of the engine sound, the noise of the motor is more Prominent, and the sound signal of the motor is generally sharp, which will bring great trouble to the user. [0003] At present, the noise reduction methods in the automotive field mainly include: (1) Physical noise reduction, which refers to the use of some traditional materials with sound insulation, sound absorption, and damping characteristics to isolate, absorb, and wrap noise and noise sources to achieve noise reduction. Purp...

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Problems solved by technology

[0004] However, although physical noise reduction technology can achieve a certain noise reduction effect, physical noise reduction can only be used to a limited extent due to the constraints of interior space, special-shaped structures, and heat dissipation indicators. Especially for motor noise, it cannot be done too much on the motor side Packaging processing; ANC technology has a certain elimination effect on low-frequency signals, but is ineffective on high-frequency signals; one problem with the masking effect is the sound pressure level of the masking sound signal. When the masking sound signal can mask the high-frequency motor signal , its sound pressure level is much higher than the natural sound pressure level of the original environment

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