中文摘要：

为进一步提高金属带CVT转矩承载能力，扩大CVT的应用范围，设计了一种双金属带式CVT。分析了双金属带CVT的运动及动力学传动特性及变速器传动效率；建立了液压控制系统简化数学模型并分析了系统稳定性；建立了基于某车型的双金属带无级变速器AMEsim整车仿真模型并进行了PID参数整定。结果表明：设计的液压系统较好解决了速比同步控制问题并具有良好的速比控制精度，与单金属带CVT相比，可实现相同带轮夹紧力条件下变速器转矩承载能力倍增，验证了该结构CVT及液压控制系统的可行性。

英文摘要：

To improve torque load capacity and extend the application scope of current continuous variable transmissions （CVT）, a kind of bi-metal belts CVT was designed. The transmission principle of kinematics and dynamics and transmission efficiency of the proposed CVT was derived. Mathematical model of the CVT hydraulic system was deduced and stability of the model was analyzed. The bi-metal belts CVT was simulated by AMEsim and the PID controller parameters were adjusted. The results showed that the proposed CVT could solve ratio synchronous control problem and had good ratio tracking accuracy. The bi-metal belts CVT could double the torque load capacity in contrast to typical CVT on the same clamping fore condition. Feasibility of the proposed CVT was verified preliminary.