基于数字流量阀负载口独立控制系统

负载口独立控制技术解决了传统阀控缸系统操纵性和节能性难以同时达到最优的问题，但负载口独立控制系统在恶劣工况下，控制器的抗干扰能力可能成为制约负载口独立控制技术广泛应用的一个关键问题。提出将PWM控制的新型数字流量阀应用于负载口独立控制系统中，介绍了新型数字流量阀结构及负载口独立控制系统原理，提出了对液压缸两腔流量、压力分别进行复合控制的控制策略。通过SimulationX软件建立系统仿真模型，对液压缸典型工况进行仿真分析。结果表明：通过对系统进行前馈 反馈复合控制，当载波频率大于40 Hz时，基于数字流量阀的负载口独立控制系统能够实现对液压缸速度的平稳控制。

The Independent Metering System Based on Digital Flow Valve

The independent metering technique can solve the issue that the characteristics of operability and energy saving are difficult to achieve optimal simultaneously in the traditional valve control cylinder system. However, when the independent metering system is under harsh conditions, the bad anti interference ability of the controller may become a key issue to limit the independent metering control system technology applied successfully. In this thesis, a new digital flow valve controlled by PWM is applied to the independent metering control system. First， the structure of new digital flow valve and the system principle based on digital flow valve control is introduced. Then the compound control strategy respectively for flow and pressure according to the hydraulic cylinder is proposed. Finally, the system simulation model based on SimulationX software is established and the typical working condition of hydraulic cylinder is analyzed. The results show that when the carrier frequency is greater than 40 Hz, the control system based on digital flow valve with the feed forward and feedback compound control can control the cylinder speed stably.