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离合器接合过程的抖振现象严重影响动力传动系统平顺性,增大摩擦片的磨损,是一个困扰离合器接合控制的问题。从摩擦导入阻尼的角度研究抖振机理,将摩擦环节的导入阻尼模型嵌入三自由度动力学模型。应用根轨迹法进行稳定性分析,得到系统稳定条件。综合激振避免和稳定性控制两条减振途径,推导出压紧力加载的抖振抑制算法,并分析了温度的影响。理论推导和仿真结果表明,离合器接合过程动力学稳定的必要条件是滑摩扭矩综合阻尼为正斜率特性,且该特性由摩擦特性和压紧力历程共同决定。考虑摩擦特性,可合理施加压紧力,以形成滑摩扭矩综合阻尼的正斜率特性,可有效抑制抖振、提高离合器接合品质。
The phenomenon of chattering in the process of clutch engagement seriously affects the smoothness of the powertrain and increases the wear of the friction plate, which is a problem that disturbs the clutch engagement control. The chattering mechanism is studied from the perspective of frictional damping, and the damping model of the friction component is embedded into the three-freedom kinetic model. The root locus method is used to analyze the stability, and the system stability conditions are obtained. Based on the two avenues of vibration reduction and stability control, the buffeting suppression algorithm based on the compression force is derived and the influence of temperature is analyzed. The theoretical derivation and simulation results show that the necessary condition for the dynamic stability of the clutch engagement process is that the compound damping of sliding friction torque is a positive slope characteristic, and the characteristic is determined by both the friction characteristics and the compaction force history. Considering the friction characteristics, the pressing force can be reasonably applied to form the positive slope characteristic of the comprehensive damping of the slip torque, which can effectively suppress chattering and improve the clutch engagement quality.