中文摘要：

针对无级自动变速传动（Continuously Variable Transmission，CVT）液压系统存在的速比响应特性差和夹紧力控制精度差导致的速比响应滞后和带轮过紧或滑转等问题，从CVT液压系统速比控制和夹紧力控制系统的实际结构两方面着手，采用有针对性的优化方法，通过对系统结构参数进行优化设计来提高速比控制和夹紧力控制的动态响应速度和跟踪精度。结合起步整车工况，运用AMESim仿真平台进行了分析验证，仿真结果表明：优化后的系统在动态响应性能及跟踪误差精度上都得到了较大的提高。

英文摘要：

Aiming at speed ratio＇s lag, tracking deviation and pulleys＇ slipping and over clamping during clamping force control of CVT （continuously variable transmission） hydraulic system, corresponding optimal design methods are employed based on the practical structure of speed ratio control and clamping force control system, and the speed ratio control and clamping force control are employed by the optimal design of the system＇s structural parameters. Combine with vehicle＇s start-up working condition, simulation analysis is carried out on the platform of AMESim. The analysis results show that the dynamic characteristics and precision of tracking deviation are improved by the optimal design system.