车内发动机噪声主动降噪辨识方法及DSP实现  

Active Noise Reduction Identification Method of Engine Noise in Vehicle and DSP Implementation

作　　者：张程鹏 张士强 李浩 王石 李允 曹蕴涛 ZHANG Chengpeng;ZHANG Shiqiang;LI Hao;WANG Shi;LI Yun;CAO Yuntao(China FAW Group Corporation,Changchun 130011,China)

机构地区：[1]中国第一汽车集团有限公司,吉林长春130011

出　　处：《汽车实用技术》2023年第8期107-112,共6页Automobile Applied Technology

摘　　要：车内主动降噪技术在低频噪声控制方面有较明显的优势,利用车内扬声器发出抵消声波实现降噪。论文采用扫频的方法进行主动降噪的次级路径建模,并在某四缸发动机车型上实现了控制器与原车线路匹配,采用原车音响搭建车内发动机主动降噪系统。采用MATLAB搭建仿真模型验证自适应陷波算法,推导了用于车内次级路径建模的扫频公式及辨识结果。再从工程角度介绍控制器与整车接口的匹配方法。最后采用数字信号处理(DSP)技术进行实车效果验证,在锁定二挡的加速工况下发动机二、四、六阶噪声降低,30~300 Hz的声压级Overall(OA)值最大降低4 dB。Active noise reduction technology has obvious advantages in low-frequency noise control.It uses the speakers in the car to cancel the sound waves to achieve noise reduction.In this paper,the frequency sweep method is used to carry out the calibration process of active noise reduction,and the controller and the original car line matching are realized on a four-cylinder engine model,and the original car audio is used to build the in-car engine active noise reduction system.Using MATLAB to build a simulation model to verify the adaptive notch algorithm,derive the sound transfer function formula in the car,and derive the identification results.From the engineering point of view,the matching method of the controller and the vehicle interface is introduced.Finally,digital signal processing(DSP)technology is used to verify the real vehicle effect,the second,fourth,and sixth-order noise of the engine is reduced under the acceleration condition of locking the second gear,and the sound pressure level overall(OA)value of 30~300 Hz is reduced by 4 dB at the maximum.

关 键 词：发动机 主动降噪 辨识方法 DSP实现 

分 类 号：U461.4[机械工程—车辆工程]