中文摘要：

基于自主开发的5速干式双离合器自动变速器（Dualclutchtransmissions。DCT），为充分反映驾驶员意图并改善不同行驶工况下DCT的换挡品质，从系统层面探讨发动机与双离合器间的转矩协调控制问题，推导换挡过程发动机转速及离合器传递转矩的计算公式。考虑该DCT物理结构特征，建立5自由度换挡动力学方程，简化后分别得到2自由度滑摩阶段模型和单自由度在挡运行模型。根据换挡品质要求量化换挡控制目标，分析换挡过程发动机与离合器的转速和转矩特性，提出模糊换挡时间决策和基于DCT动态模型的转矩协调控制策略。在Matlab／Simulink软件平台上，搭建DCT换挡控制仿真模型，对驾驶员不同意图下DCT的升、降挡过程进行仿真分析，并开展实车转毂试验。仿真及试验结果表明，所提出基于模型的转矩协调控制策略不仅有效体现了驾驶员换挡意图，改善了DCT换挡品质，而且能够较好地适应各种换挡工况，具有较强的鲁棒性。

英文摘要：

Based on the five-speed dry dual clutch transmission（DCT） which have been independently developed, the issue of torque coordinating control between engine and twin clutches is been discussed from the system level in order to adequately reflect the driver＇s intension and improve the shift quality of DCT, calculation formulas of engine speed and clutch delivered torque during the shifting process are been induced also. Considering the characteristic of physical configuration, five degrees-of-freedom（DOF） shifting dynamics equations of DCT are been established, after simplifying two-DOF model in the stage of slip-friction and one-DOF model in the stage of in-gear stable operation are been respectively attained. According to the requirements of the shift quality, the quantitative control objectives of shifting process are been proposed. Based on the analysis of torque and speed characteristics of engine and twin clutches during the shifting process, the fuzzy time decision and the model-based torque coordinating control strategy are been produced. Simulation model of DCT shifting control is been established on the Matlab/Simulink software platform, upshifting process and downshifting process are been simulated and analyzed under different driving intension. Real vehicle chassis dynamometer test has also been done. Simulation and experiment results show that the proposed model-based torque coordinating control strategy can not only effectively reflects the driver shift intention and improve the shift quality of DCT, but also be adaptable to the various shifting conditions and has strong robustness.