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目的:电液流量匹配系统通过前馈指令信号来调节泵排量,故可采用增大阀口开度的方法来降低能量损失,但是该方法降低了超越负载工况下的操控性能。为改进该工况下的系统动态性能,本文旨在研究电液流量匹配系统泵阀控制方法,在提高系统效率的前提下,提高系统动态性能。创新点:提出了基于比例阀补偿的动态性能改进方法,研制了考虑动静态性能补偿的比例阀控制器,提高了系统速度控制性能。方法:1.建立电液流量匹配节能系统数学模型,分析在超越或阻抗工况下的系统速度控制需求;2.提出基于比例阀开口补偿的控制方法(图2)以提高系统动态性能;3.相对于传统阀口控制方法,分析提出的方法在不同负载工况下的节能特性;4.通过频域分析法研究系统稳定性,并提出保证系统稳定和动态性能的参数选取准则。结论:1.相比传统阀口控制方法,提出的基于比例阀补偿的控制方法能够提高3.2%~6.8%的系统效率;2.相对于阀口全开控制方法,所提方法的优势在于能保证系统在不同工况下的动态控制性能,尤其能保证在超越负载工况下的系统可控性;3.所提方法不仅提高了设备的效率,也保证了系统的操控性能。
Objective: The electro-hydraulic flow matching system adjusts the displacement of the pump by the feedforward command signal, so the method of increasing the opening of the valve can be adopted to reduce the energy loss. However, this method reduces the control performance beyond the load condition. In order to improve the system dynamic performance under this condition, this paper aims to study the valve control method of electro-hydraulic flow matching system, and improve the system dynamic performance under the premise of improving system efficiency. Innovative point: Proposed the dynamic performance improvement method based on proportional valve compensation, developed a proportional valve controller considering dynamic and static performance compensation, and improved the system speed control performance. To establish the mathematical model of electro-hydraulic flow matching energy-saving system and analyze the demand of system speed control under overrun or impedance condition; 2. Propose the control method based on proportion valve opening compensation (Figure 2) to improve the system dynamic performance; 3 Compared with the traditional method of valve port control, the energy saving characteristics of the proposed method under different load conditions are analyzed.4. The stability of the system is studied by the method of frequency domain analysis, and the parameter selection criteria for ensuring system stability and dynamic performance are proposed. Compared with the traditional valve port control method, the proposed control method based on proportional valve compensation can improve the system efficiency of 3.2% ~ 6.8%; 2. Compared with the valve port full open control method, the proposed method has the advantage of Ensure the dynamic control performance of the system under different operating conditions, and in particular ensure system controllability under overload conditions. The proposed method not only improves the efficiency of the equipment but also ensures the controllability of the system.