The novel power-cycling variable transmission (PCVT) has special speed regulation characteristics, and its gearshift process is accompanied by sudden change of speed ratio and change of system efficiency, which affect the shift quality. In order to propose an effective shift control strategies, a dynamic model of shifting process is established based on the analysis of PCVT's working principle and speed regulation characteristics. According to the shifting mechanism of PCVT, the shifting process is divided into four stages, and the dynamic equation is established in stages. Based on the PCVT shift control requirements, the clutch and engine controller are designed in stages. For the torque phase, a finite time linear quadratic regulator is used to determine the optimal clutch engagement and disengagement speed, with the jerk and friction work as optimization indices. For the inertia phase, the fuzzy compensation controllers of the clutch and the engine are designed respectively under the comprehensive consideration of the factors such as the speed ratio of torque converter and the system efficiency. Simulation results show that the proposed shift control strategy can achieve smooth shift and meet the control requirements well.

中文翻译：

---

一种新型动力循环无级变速器的换档控制

新型动力循环变速器(PCVT)具有特殊的调速特性，其换挡过程伴随着速比的突然变化和系统效率的变化，影响换挡质量。为了提出有效的换挡控制策略，在分析PCVT工作原理和调速特性的基础上，建立了换挡过程的动态模型。根据PCVT的换挡机理，将换挡过程分为四个阶段，分阶段建立动力学方程。根据PCVT换档控制要求，分阶段设计离合器和发动机控制器。对于扭矩阶段，使用有限时间线性二次调节器来确定最佳离合器接合和分离速度，加加速度和摩擦功作为优化指标。对于惯性阶段，综合考虑变矩器速比和系统效率等因素，分别设计了离合器和发动机的模糊补偿控制器。仿真结果表明，所提出的换挡控制策略能够实现平稳换挡，很好地满足控制要求。