负载敏感泵流量控制精度及变量机构节流损耗特性

为了提升负载敏感泵控系统流量控制特性，建立了负载敏感泵控系统动态数学模型及动态仿真模型，并对模型的正确性开展了台架试验验证.以动态模型为依据，着重分析了变量机构关键配合参数对负载敏感泵控系统流量控制精度及变量机构能耗特性的影响规律.研究发现，适当的负载敏感阀及压力切断阀径向配合间隙和负载敏感阀口负遮盖量，不仅有利于提高负载敏感泵控系统的流量控制精度，而且能将变量机构节流损耗控制在较低水平.过大的间隙和负遮盖量设计，不仅会导致变量机构节流损耗大幅增加，而且会导致负载敏感泵控系统的流量控制精度大幅降低.

Flow Control Accuracy of Load Sensing Pump and Energy Loss of Displacement Control Mechanism

In order to improve the control characteristics of load sensing pump control system, a dynamic mathematical model and a dynamic simulation model of load sensing pump control system were established, and the correctness of the models were verified by bench test. Based on the dynamic model, the influence of the key matching parameters of the displacement control mechanism on the flow control accuracy of load sensing pump control system and the energy consumption characteristics of the displacement control mechanism was emphatically analyzed. The results show that proper radial fit clearance of load sensing valve and pressure shut-off valve and proper negative cover amount of load sensing valve port are not only conducive to improve the flow control accuracy of load sensing pump control system, but also constrain the energy consumption of displacement control mechanism at a low level. Excessive clearance and excessive negative cover amount will not only greatly increase the throttling loss of displacement control mechanism, but also greatly reduce the flow control accuracy of load sensing pump control system.