中文摘要：

针对现有电液比例控制技术中内反馈阀结构复杂，制造难度大，控制精度低，而采用电反馈阀成本高，难以满足普通用户需求，且二者在机械结构上不兼容，为设计制造带来不便等问题。突破传统原理，创造性地将位移．流量反馈原理应用到三位四通比例方向阀，构造开环可工作的比例方向阀，在此基础上进一步增设电子闭环通道，用前馈控制器消除内反馈与电闭环之间的耦合。研究中，根据阀的结构及工作原理建立完整数学模型，通过合理假设将其动态模型简化为一阶线性系统并进行理论分析；进一步在Simulation X仿真平台上建立阀的多学科模型，分别对阀处于内反馈和电闭环两种工作模式下的动静态特性进行仿真研究，通过数字仿真确定出阀的主要结构参数，制造出样机，在试验台上对物理样机的基本特性进行测试，验证仿真结果的正确性，表明新原理阀具有较好的动静态性能。

英文摘要：

Considering the problems that in existing electro-hydraulic proportional control technology, the internal feedback valve has complex structure, difficulties in manufacture and low control accuracy. While the electronic closed-loop controlled valve is of high cost, so it is difficult to meet the needs of ordinary customers. Since they are not compatible in mechanical structures, it brings great inconvenience for enterprises to manufacture. The traditional principle is broken through, and the displacement flow feedback control principle is applied innovatively to the 3-position 4-way proportional direction valve that may operate under open loop condition. Based on this, electronic closed loop channel is applied. And the coupling between internal feedback and electronic closed loop is eliminated by feed forward controller. In the research, a complete mathematical model is established based on the structure and working principle of the new valve. And the dynamic model is simplified as a first order linear system for theoretical analysis with the help of reasonable hypothesis. Then the multi-domain model is set up in simulation platform--SimulationX. Research on the dynamic and stile characteristics of the valve working respectively in internal feedback and electronic closed-loop control model is involved. By digital simulation the key geometric parameters are calculate, and the valve prototype is manufactured. The basic properties are tested on a testbed. Experimental findings validate the correctness of the simulation results. It shows that the new valve is of good static and dynamic characteristics.