In this paper, a mechanism-oriented control strategy is proposed to cut off the introduction process of negative damping caused by the Stribeck effect for suppressing the vehicle start-up judder. From the experimental analysis, the characteristic frequency of start-up judder is mainly concentrated at about 8.25 Hz, coinciding with the first-order natural frequency of the driveline system. A 13-degree-of-freedom powertrain branched model is established, whose validity and accuracy in reflecting the characteristics of start-up judder are verified by comparing with the experimental results in time–frequency domain. The start-up judder mechanism is profoundly revealed through explaining the introduction of negative damping and the origin of characteristic frequency. The positive-feedback closed loop caused by the negative gradient characteristic of the Stribeck effect is the determining factor that promotes the aggravation of the fluctuation in the rotational speed of clutch-driven plate, which is the manifestation of the negative damping. The core idea of the mechanism-oriented control strategy is to cut off the positive-feedback closed loop, which is achieved by fine-tuning the position of release bearing. The judder-suppression performance behaves well both in simulation and in experiment.

中文翻译：

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干式自动离合器车辆起步抖动抑制的机构导向控制：实验与仿真分析

本文提出了一种面向机构的控制策略，以切断由 Stribeck 效应引起的负阻尼的引入过程，以抑制车辆启动抖动。从实验分析来看，启动抖动的特征频率主要集中在8.25Hz左右，与传动系统的一阶固有频率一致。建立了13自由度动力总成分支模型，通过与时频域实验结果的对比，验证了其在反映启动抖动特性方面的有效性和准确性。通过解释负阻尼的引入和特征频率的起源，深刻揭示了启动抖动机制。Stribeck效应的负梯度特性引起的正反馈闭环是促使离合器从动盘转速波动加剧的决定因素，是负阻尼的表现形式。面向机构的控制策略的核心思想是切断正反馈闭环，通过微调分离轴承的位置来实现。抖动抑制性能在模拟和实验中都表现良好。这是通过微调分离轴承的位置来实现的。抖动抑制性能在模拟和实验中都表现良好。这是通过微调分离轴承的位置来实现的。抖动抑制性能在模拟和实验中都表现良好。