中文摘要：

双离合器式自动变速器（Dual clutch transmission,DCT）换档过程控制的关键在于发动机、双离合器间的协调控制,以及各离合器传递转矩和发动机输出转矩的精确闭环控制,而离合器转矩闭环控制的实施及控制精度则完全依赖于其传递转矩的实时有效估计。针对6速干式DCT,设计了换档过程离合器以及发动机的协调控制策略;基于双遗忘因子的递推最小二乘法对车辆行驶阻力矩进行估计,同时搭建高阶滑模观测器对发动机以及输出轴的角加速度进行重构,并设计未知输入观测器估计离合器传递转矩;基于自主设计的干式DCT动态试验台架,对所设计的离合器传递转矩估计算法进行台架试验验证。仿真以及试验结果表明：所采用的高阶滑模观测估计算法以及未知输入观测器能有效地估计换档过程中离合器实际所传递的转矩,为后续进一步改善干式DCT样车换档品质奠定了基础。

英文摘要：

The key for the shifting control of the dual clutch transmission（DCT） lies in the coordination control between the engine and the double clutch,and the accurate closed-loop control of torque transmitted by each clutch as well as the output torque of the engine,and the implementation and the control precision of the clutch torque closed-loop control is completely dependent on the effectively real-time estimation of the clutch torque.As for the six-speed dry dual clutch transmission（DDCT）,the shifting control strategy is made based on the dynamical model of the DCT,and the vehicle drag torque is estimated on the basis of the recursive least square with dual forgetting factors accounts for different rates of change for different parameters,and the angular acceleration of the engine and the output shaft is refactored utilizing the high order sliding mode observer algorithm.The clutch transmitted torque is estimated using the unknown input observer.The shifting process of the DCT vehicle is simulated on the basis of the self-designed DCT dynamical test bench,and the clutch torque estimation algorithm is validated based on the sliding mode observer as well as the unknown input observer.The simulation and the experiment results show that the proposed sliding mode observer and the unknown input observer could estimate the clutch torque effectively,and lays the foundation for subsequent real vehicle control strategy development.