液阻全桥网络负载口独立电液系统节能控制策略仿真

针对传统电液控制系统节流损失大、能耗高、效率低的问题，采用液阻全桥网络搭建了具有负载口独立控制特性的新型电液控制系统，详细研究了该系统在典型四象限负载下的节能控制策略。液阻全桥网络电液系统由5个二位二通比例阀组成，根据其具有的负载口独立控制特性，将系统归纳为传统三位四通、负载口独立和负载敏感3种控制模式。传统三位四通下，两负载口开度控制模拟三位四通进出口耦合形式；负载口独立模式下，采用一腔控制流量另一腔阀口全开的控制策略；负载敏感模式下，控制泵出口压力比进油腔压力高一个定值，从而实现负载敏感功能。在超越负载下，3种模式都使用流量再生回路进行节能控制。AMESim+Matlab联合仿真结果表明，与传统的三位四通模式相比，三位四通流量再生、负载口独立、负载口独立流量再生、负载敏感模式分别节能43.38%、65.27%、77.91%、83.58%。

Simulation of energy-saving control strategy for independent metering electro-hydraulic system based on hydranlic-resistance full-bridge network

To address issues such as high throttle loss, high energy consumption, and low efficiency in traditional electro-hydraulic control systems, a novel electro-hydraulic control system characterized by independent metering is introduced in this study. This system incorporates a full-bridge hydraulic resistance network, and its energy-saving control strategy is extensively investigated under typical four-quadrant load. Comprising five two-position two-way proportional valves, the hydraulic-resistance full-bridge electro-hydraulic system is categorized into three control modes: a traditional three-position four-way control mode, an independent metering control mode, and a load sensitive control mode. In the traditional mode, the opening control of the two load ports mimics three-position and four-way inlet and outlet coupling. In the independent metering mode, one cavity regulates the flow, while the other cavity controls the full opening of the valve port. The load-sensitive mode ensures a fixed pump outlet pressure higher than the intake cavity pressure, achieving load-sensitive functionality. Additionally, a flow regeneration circuit is used for energy-saving control across all three modes. Results of combined simulation using AMESim+MAT2 show that compared with the traditional three-position four-way valve mode, the three-position four-way flow regeneration mode, the independent metering flow regeneration mode, and the load sensitive mode can achieve energy savings of 43.38%, 65.27%, 77.91% and 83.58%, respectively.