中文摘要：

为了研究高速开关阀在液压缸位置控制系统中的应用,在分析高速开关阀流量特性的基础上,针对高速开关阀流量控制存在的死区和饱和区,利用脉频调制（PFM）和脉宽调制（PWM）相结合的控制方式对高速开关阀进行补偿,使其流量线性化。在液压缸控制过程中,针对纯反馈的滞后性和前馈控制抗干扰性差的特点,提出了前馈-反馈的控制策略,即对高速开关阀提前给定一定频率和占空比的脉冲信号,利用模糊算法实时调整高速开关阀的工作频率和占空比,对液压缸中活塞的位移误差进行修正,以达到对液压缸中活塞位置的精确控制。利用节点容腔法建立了液压缸的进油和回油支路的流量与力学方程,并在Simulink环境下建立起仿真模型,通过FESTO液压实验平台搭建油路进行实验验证,得出了仿真与实验情况下的液压缸中活塞位移及高速开关阀的频率、占空比特性曲线。仿真与实验对比结果表明：综合运用模糊控制修正的前馈-反馈控制策略与PWM-PFM相结合的控制算法,可有效实现液压缸中活塞位置的精确控制,其误差可控制在-0.3-0.3mm内。

英文摘要：

A strategy combined the PWM with pulse frequency modulation（PFM）was proposed to compensate the dead and saturated zones of a high-speed on-off valve,and linearized the flow of hignspeed on-off valve,which was on the groundwork of the analysis of the flow characteristic of highspeed on-off valve.A compound algorithm of fuzzy feedforward-feedback was put forward to realize the precise position control,which could be considered as the duty cycle was given ahead,and the fuzzy algorithm was designed and utilized to deal with the position errors by adjusting frequency and duty cycle of the high-speed on-off valve.The mathematical models of the force balance and the flow continuously equation were analyzed and simulated with Simulink using the finite chamber method.The hydraulic loop was established to verify the simulation results with FESTO.The simulation and experimental results show that the compound algorithm of fuzzy feedforward-feedback and the control method of PWM and PFM can realize the precise position control effectively,and the position errors can be limited within-0.3-0.3mm.