提升车辆驾驶品质的干式离合器抗扰最优滑磨控制

电控机械式自动变速器（Automated manual transmission,AMT）换档品质难以控制,其主要原因是干式离合器没有油膜缓冲,且存在摩擦因数变化、膜片弹簧衰退等不确定因素。为了提高换档过程的驾驶品质,提出对离合器滑磨与驱动力矩恢复进行并行控制的动力换档模式,并为此过程设计"抗扰最优控制+模型误差观测"的换档控制策略。通过扰动观测器得到离合器与车辆动力传动系统的建模误差及外界扰动,进而将其视为系统扰动,设计可处理快变扰动的最优换档控制器,实现任意工况下滑磨功和冲击度的综合优化。联合仿真与实车试验结果表明,提出的方法不仅提升换档过程的驾驶品质,而且对不同工况有自适应能力,从而解决AMT车辆难以保证驾驶品质控制效果一致性的行业难题。

Optimal Clutch Slip Control of AMT to Improve Vehicle Drivability

The shift quality of automated manual transmission(AMT) is difficult to control, and its main reason is that the dry clutch has no oil film buffer, and there are uncertain factors like various friction coefficient, the diaphragm spring decline, etc. To improve the shift quality, a powertrain shift control mode is proposed, which keeps clutch slip process and the rise of driving torque under control parallelly, along with that a control strategy of "disturbance optimal controller + model error observer" for shift process is designed. The modeling errors and disturbances in clutch and the plant model of vehicle powertrain are obtained through the disturbance observer firstly, which regarded as the system disturbance. Then the shift optimal controller which could deal with the rapid time-varying disturbances is designed with the comprehensive optimization between the slipping friction loss and jerk in any working condition. The results of the co-simulation (AMESim & Matlab/Simulink) and experimental tests show that, the proposed methods not only improve the shift quality, but also have self-adaptability to different working conditions, which solve the industry problem that it is hard for AMT vehicles to ensure the consistency of quality control effects.