离合器到离合器动力降挡过程控制机理研究

对汽车自动变速器离合器到离合器动力降挡过程控制机理及控制策略进行了研究.从理论上阐明了动力降挡过程两离合器之间的动力转化机理，进而提出两离合器之间实现理想动力搭接的方法，并通过仿真及实车试验进行了验证.揭示了离合器完全结合瞬间产生换挡冲击的机理，并指出减少这种冲击的策略.在机理研究的基础上提出了基于输入轴转速目标轨迹的分段控制策略，并进行了仿真和实车试验验证，结果证明了机理分析的正确性和控制策略的可行性. 

Study on the Control Mechanism of Clutch-to-Clutch Power Downshift Process

The control mechanism and control strategy of the clutch-to-clutch power downshift process of automotive automatic transmission were studied. Firstly, the power conversion mechanism between the two clutches in the power downshift process was theoretically clarified, and a method was proposed to achieve the ideal power lap between the two clutches, and verified by simulation and real vehicle test. Then the mechanism of generating a shift shock at the clutch fully engaged was revealed, and a strategy was presented for reducing such a shock. Finally, based on the mechanism research, a piecewise control strategy was proposed for the target trajectory of the input shaft speed. The results of the simulation and real vehicle test show the correctness of the mechanism analysis and the feasibility of the control strategy.