In the context of national"carbon peaking and carbon neutrality", electric vehicles are the future of automobiles. Differential is an important part of the automotive steering system, and its NVH performance directly affects the driving quality of the whole vehicle. When doing a lemniscate steering, noise was encountered in the test. To address the problem, sensors were arranged on the brackets of half-shafts on both sides and the accessories of the bearing housing of the electric drive. Vibration and noise signals were collected, then characteristics of those data were analyzed in the time domain as well as some audio data. Combined with evaluation during subjective driving, the instantaneous shock of the vibration acceleration of the electric drive differential are obvious, and the amplitude of vibration of the differential bearing housing is the largest. Tests were carried out to reproduce some failure in the electric driving assembly. Finally, locking the electric differential was found to be the main cause of the noise during lemniscate steering. Optimization strategy was formulated and bench test and vehicle verification were completed, which successfully solved this engineering problem.
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