Based on the traditional automatic transmission, Dedicated Hybrid Transmission (DHT) with P2 configuration is developed by replacing hydraulic torque converter with a wet electronically controlled clutch and a driving motor. The paper proposed a coordinated control strategy of the upshift process for the P2 configuration parallel hybrid vehicle equipped with DHT to ensure the shift quality. Firstly, considering the meshing transmission loss, the dynamics modelling of DHT shifting process was built by Lagrange method, and the model parameters were identified by bench test; Secondly, taking no jerk as the constraint and minimum slipping work as the optimisation goal, the forward discrete dynamic programming was used to solve the optimal control law of the transmission torque of the shifting clutch and the input shaft torque of transmission. Besides, for the hybrid operation mode, further considering the influence of the motor, engine and main clutch, two coordinated control strategies of the main clutch engagement and slipping were proposed. The simulation results show that the two coordinated control strategies can achieve small jerk and slipping work, ensure smoothness in the course of gear shift. And by the method of slipping control of the main clutch, the shifting time can be shortened.

在传统自动变速器的基础上，采用湿式电控离合器和驱动电机取代液力变矩器，开发出P2配置的专用混合动力变速器（DHT）。为保证换档质量的P2配置并联式混合动力汽车，提出了一种升档过程协调控制策略。首先，考虑啮合传动损失，采用拉格朗日方法建立DHT换档过程动力学模型，并通过台架试验确定模型参数；其次，以无加加速度为约束条件，以最小打滑功为优化目标，采用前向离散动态规划求解换档离合器传递转矩和变速器输入轴转矩的最优控制律。除了，针对混合动力运行模式，进一步考虑电机、发动机和主离合器的影响，提出了主离合器接合和打滑两种协调控制策略。仿真结果表明，两种协调控制策略可以实现小跳动和打滑工作，保证换档过程中的平顺性。并且通过主离合器打滑控制的方法，可以缩短换档时间。