某国六SUV车型碳罐电磁阀工作引起的车内噪声分析与优化

Analysis and Optimization of Vehicle Noise Caused by the Operation of Carbon Tank Solenoid Valve for China Sixth SUV Vehicle

本文以搭载2.0T汽油发动机和6AT变速箱的某国六样车为研究对象,针对怠速车内“哒哒声”问题,通过传递路径分析以及脱离脱附管验证,确定了碳罐电磁阀-脱附管-地板为主要传递路径,问题频段为450-600Hz。依据扩张消音器的工作原理,在脱附管上增加50mL的扩张腔体,最终怠速车内“哒哒声”消失,利用频谱分析法得到优化前后450-600Hz之间车内中排噪声降低了4.9dB(A),后排噪声降低了7.8dB(A),对应车内中排总声压级降低了1.3dB(A),后排总声压级降低了2.7dB(A),且主观评价完全可以接受。该优化方案简单有效,成本较低,具有一定的工程指导意义。

In this paper,a China sixth SUV vehicle with 2.0T gasoline engine and 6AT gearbox is taken as the research object.In order to solve the problems of“click”in the vehicle under idle condition,the main transmission path of carbon tank solenoid valve-desorption pipe-floor is determined through the analysis of transmission path and the verification of separating the desorption pipe.The frequency band of the problem is 450-600Hz.According to the working principle of expansion muffler,50mL expansion chamber was added to the desorption pipe.Finally,the“click”disappeared in the vehicle under idle condition.By using spectrum analysis method before and after optimization,it is found that the middle noise in the vehicle is reduced by 4.9dB(A),the rear noise by 7.8dB(A)between in the frequency band of 450-600Hz.Besides,the total sound pressure level of middle noise in the vehicle is reduced by 1.3dB(A)and the rear noise by 2.7dB(A)before and after optimization.More importantly,subjective evaluation is completely acceptable.The optimization scheme is simple and effective with low cost,which has certain engineering guiding significance.