电控正流量挖掘机分工况功率匹配研究

Research on Power Matching of Electronically Controlled Positive Flow Excavator under Different Working Conditions

针对目前电控正流量挖掘机系统研究较少、空载时能量损失大、发动机与主泵功率不匹配以及节能控制效果不佳的问题,搭建基于AMESim和Simulink的挖掘机电液系统联合仿真平台,提出一种双变量泵的发动机-泵恒功率控制方法。通过样机仿真实验以及分工况功率匹配研究,验证搭建的电控正流量挖掘机系统的正确性以及分工况功率匹配的有效性。仿真实验结果表明:设计的仿真模型以及功率匹配策略表现良好,在仿真和实验中,不同的工况模式下均可以保证泵的恒功率特性,可以实现对发动机的功率控制,发动机功率可以得到充分利用。

Aiming at the problems of less research on the current electronically controlled positive flow excavator system,large energy loss at no-load,power mismatch between engine and main pump and poor energy-saving control effect,a co-simulation platform of excavator electro-hydraulic system based on AMESim and Simulink was built and an engine-pump constant power control method for dual variable pump was proposed.Through the simulation experiment of the prototype and the research of power matching under different working conditions,the correctness of the built electronically controlled positive flow excavator system and the effectiveness of power matching under different working conditions were verified.The simulation results show that the designed simulation model and power matching strategy perform well.In the simulation and experiment,the constant power characteristics of the pump can be guaranteed under different working conditions,engine power can be fully utilized and the power control of the engine can be realized.