电磁环境对电液比例变量泵性能的影响

 工程机械处于电磁环境中时，机电液控制系统中的电磁敏感元件容易受到电磁场的干扰，使机电液控制系统的输入输出发生变化，导致工程机械无法正常工作。根据某工程机械液压系统控制原理，针对电液比例变量泵的负荷传感控制和电比例调解的运行方式，分析液压系统的特点及影响系统性能的因素。比例电磁铁的非线性磁特性壳体材料在磁场环境下，材料内的磁场强度会发生变化。根据比例电磁铁的结构，左右输出端空气隙磁通量发生变化使输出力特性发生变化。通过对比例电磁铁磁路分析，确立了电磁环境下比例电磁铁的力学模型。比例电磁铁输出力的变化对负荷传感控制元件的作用将改变系统的输出性能。利用天线发射电磁波产生电磁场环境，通过测试某工程机械液压系统在电磁环境下的输出特性，来分析电磁场对比例电磁铁的影响变化。试验结果显示，在电磁场作用下比例电磁铁推力的变化与输入的电流不成比例，出现了偏差；机电液控制系统的控制性能变得不稳定，表明应提高机电液控制系统中电磁敏感元件的抗电磁干扰能力。

Effect of Electromagnetic Environment on the Performance of Electric Proportional Variable-capacity Pump

In the electromagnetic environments, the mechanical electrical hydraulic control system of engineering machinery's electromagnetic sense organs is susceptible to electromagnetic interference, which will in turn cause failures due to the change of the mechanical electrical hydraulic control system's input and output. According to engineering machinery hydraulic system control principle, based on the study of the structural features and the non-linear magnetic properties of shell materials, this paper analyzes the change of electromagnetism in the proportional solenoid around the output air gap in the electromagnetic environments, the electro-hydraulic proportional variable displacement pump's load sensing control system, the electric-hydraulic proportional control mediation, with respect to the hydraulic system property and affecting factors on the system performance, and proposes a mechanical model of proportional solenoid in the electromagnetic environments. System output performance will be changed by the action of the output force change in the proportional solenoid for the load sensing control component. Using antennas to emit electromagnetic wave to generate the electromagnetic environments, we analyze the proportional solenoid changes on the impact of the variable pump performance in the electromagnetic environments, by testing the electric proportional variable pump's output pressure. Experimental results show that the electric proportional variable pump's output pressure is elevated and the mechanical electrical hydraulic control system's control performance will become unstable. One should improve the anti-jamming capability of electromagnetic sense organs.