主动先导级控制的电液比例流量阀关键技术研究

High-precision electro-hydraulic proportional flow valve is a core component of many major machinery and equipment in the electro-hydraulic control system. But nowadays used pressure compensator or flow sensor controls flow, the valve will reduce the flow capacity, increase system power loss and cause serious system heat; the valve is affected by load changes impact very large, low control accuracy; low operating pressure range of poor control, dynamic response slow. In order to improve these phenomena, we propose to use motor-driven hydraulic pump module connected valvistor valve to construct the structure of new high-precision electro-hydraulic proportional flow valve, The main valve flow proportionai to the Pilot flow, no matter how big or small、 plus or minus pressure difference, it can output the premise of stable flow to improve flow valve of the purpose of the low voltage control and dynamic response. Based on the high precision flow control strategy, the failure mechanism and its low voltage controlled scientific problems for research, and establish the role of the valve CFD model to calculate the transient and steady-state flow force on the main valve, optimization design of the main valve structure; build the static valve dynamic mathematical model to analyze the influence of various parameters on the performance of the valve; establish a control valve and flow compensated algorithm model; Build the flow characteristics of the valve and its test platform multidisciplinary mathematical model for testing and validation, the new research will electro-hydraulic proportional flow valve is designed to provide a new theoretical basis and methodological guidance.

高精度电液比例流量阀是很多重大机械装备中电液控制系统的核心部件。但采用压差补偿器或流量传感器控制流量，会降低阀的通流能力，增加系统功率损失和发热；从而导致系统受负载变化影响大，控制精度低；低工作压力范围可控性差、动态响应慢。因此，提出利用电机驱动液压泵作为先导级，连接Valvistor主阀，构造新的高精度电液比例流量阀，使主阀流量与先导流量成正比，其无论压差大小、正负皆可输出稳定的先导流量，达到提高流量阀的低压可控性和动态响应特性的目的。围绕高精度流量的调控策略，阀失效机理及其低压可控性的科学问题进行研究，建立阀的CFD模型以计算作用在主阀芯上的瞬态和稳态液动力，优化设计主阀结构；构建阀的静、动态数学模型，分析各参数对其性能的影响；建立阀的控制与流量补偿算法模型；搭建试验平台对该阀的流量特性及其多学科数学模型进行测试和验证，该研究成果将为新型电液比例流量阀的设计提供新的理论依据和方法指导。

高精度电液比例流量阀是很多重大机械装备中电液控制系统的核心部件。但目前采用压差补偿器或流量传感器控制流量，会降低阀的通流能力，增加系统功率损失和发热；从而导致系统受负载变化影响大，控制精度低；低工作压力范围可控性差、动态响应慢。因此，提出利用电机驱动液压泵，连接主阀，构造新的高精度电液比例流量阀，使主阀流量与先导流量成正比，不受负载压差影响。采用液压泵作为先导级，其无论压差大小、正负皆可输出稳定的先导流量，提高阀的低压可控性和动态响应特性。围绕高精度流量的调控策略，阀失效机理及其低压可控性的科学问题进行研究，建立了新电液比例流量阀的数学模型，并建立其AMESim模型，对该阀的静动态特性的影响进行计算仿真分析，为进一步优化新电液比例流量阀结构提供依据；通过对新型采用主动先导级控制的电液比例流量阀研究，探索负载在剧烈变化时的高精度电液比例流量阀流量补偿方法及关键技术；为电液控制系统高精度流量提供新原理和新方法，为电液比例流量阀在工程、矿山机械等领域的推广与应用奠定理论及试验基础。