针对液压缸正反方向运动特性不一致问题，建立包含死区的电液比例阀控非对称液压缸系统的数学模型，分析外负载变化、液压缸结构不对称对系统特性的影响。根据系统的数学模型得到比例阀开口处于线性区域时系统在任意负载状态下的负载流量特性曲线。研究结果表明：随着液压缸两腔面积比的减小，系统的不对称特性增大；随着压力负载增加，系统的非对称性先减弱后增强；随着拉力负载的增加，系统的非对称性增强；实际负载流量比与理论负载流量比相对误差不超过6%，验证了负载流量特性分析的正确性。%Aiming at the inconsistent dynamic property, the mathematic model of asymmetric electrohydraulic proportional system with dead zone was built, and the asymmetric property of the system was analysed based on the model with the influence of the load and the asymmetric structure. The load flow property curve in any load situation was obtained using the mathematic model when the proportional valve was in the linear flow zone. The results show that the asymmetric property of proportional valve is more obvious with the increase of pulling load and the decrease of the area proportion, but is less obvious at first and then more with the increase of pressure load. The relative error between the actual load flow proportion and the theoretical value is less than 6%and the analysis of the load flow property is verified correct.
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