车辆怠速抖动分析及优化

周伟强，白小婷，胡军峰，张艳，林霄喆

无锡星驱动力科技有限公司，江苏 无锡  214000

摘要：为解决车辆开发过程中怠速抖动问题，排查怠速抖动成因，采用怠速转速振动测试试验及旋转件动平衡测试，分析旋转件动平衡、怠速转速设置对振动速度的影响，并采用调整动平衡和将怠速转速设置为700 r/min的方法进行优化。结果表明：将双离合器花键与双质量飞轮花键在原状态下旋转180°进行装配，测点振动速度不满足测试要求，不能解决怠速抖动问题；怠速转速增大，车辆抖动程度增大；怠速转速对应的振动频率与整车动力总成的刚体模态频率相近，车辆振动更加明显；怠速转速调整为700 r/min时，对应的振动频率为11.7 Hz，测点振动速度满足测试要求，为最优解决方案。

关键词：自动变速器；怠速转速；怠速抖动；振动测试

Analysis and optimization of vehicle idle speed vibration

ZHOU Weiqiang, BAI Xiaoting, HU Junfeng, ZHANG Yan, LIN Xiaozhe

Wuxi InfiMotion Propulsion Technology Co., Ltd., Wuxi 214000, China

Abstract: To solve the problem of idle vibration during vehicle development and identify its causes, idle speed vibration tests and rotating component dynamic balance tests are carried out to analyze the impacts of rotating component dynamic balance and idle speed setting on vibration velocity. An optimization method is adopted by adjusting the dynamic balance and setting the idle speed to 700 r/min. The results show that the vibration velocity of the test point is not satisfied with the test requirement and the problem of idle vibration can not be solved when the spline of the dual clutch is assembled with the spline of the dual mass flywheel by rotating 180° degrees in the original state. The degree of vehicle vibration increases with the rise of idle speed. When the vibration frequency corresponding to the idle speed is close to the rigid body modal frequency of the vehicle powertrain, the vehicle vibration becomes more obvious. When the idle speed is adjusted to 700 r/min, the corresponding vibration frequency is 11.7 Hz, and the vibration velocity at the measuring points meets the test requirements, which is the optimal solution.

Keywords: automatic transmission; idle speed; idle vibration; vibration test