关键词: 新能源汽车；控制臂；衬套异响；问题分析

Abstract: In the winter environment of a new energy model in the northern market, the conventional small rolling road conditions and braking conditions will appear "squelch" abnormal noise. The paper uses fault tree analysis to analyse and verify the vehicle's operating environment, bushing structure and other aspects, and identifies the bushing structure as the main cause of the noise. After the improvement of the bushing structure, performance tests related to the bushing are conducted, such as low temperature pull-off force, bushing stiffness, fatigue endurance, comprehensive road test and other related performance verification. Simultaneously, the vehicle's handling stability and driving comfort are also verified to ensure that the bushing structure change do not cause significant changes in other performance. Finally, the aftermarket complaint rate is monitored: six months after the changeover is completed, the number of complaints in the aftermarket had effectively dropped from 116 between January and March of the first year to one between January and March of the second year, a significant reduction in the complaint rate, thus demonstrating the effectiveness of the programme.

Key words: New energy vehicle; Control arms; Bushings rattles; Problem analysis