基于负载平衡的混合动力挖掘机功率匹配研究

Power Matching of Hybrid Excavator Based on Load Balance

液压挖掘机在工作时,工况变化剧烈,但在每个工作循环中输出功率是有规律可循的,通过对单工作循环能量的回收与利用,能够使柴油机工况稳定。采用二次调节技术对负载功率进行平衡,使柴油机稳定工作在燃油高效区。利用Simulation X对原机系统进行建模,包括液压系统、柴油机、多体动力学模型,并与试验数据进行对比,验证仿真模型;将油液混合动力系统应用到原机系统,并对主要参数进行匹配;在前馈与压力双控制方案下,对改进后的模型进行功率匹配研究。仿真试验结果研究发现:在前馈与压力双控制方案下,能够减小柴油机装机功率并使柴油机功率输出平稳,基本稳定在燃油高效区。

When the hydraulic excavator at work, the working condition changes drastically, but the output power of the hydraulic excavator is regular. In this study, the load power is balanced by the secondary regulation technology, so that the diesel engine can work stably in the high fuel efficiency zone. The models of the original machine system are built in SimulationX, including hydraulic system, diesel engine, the multi-body dynamics model, and then the simulation model is verified by comparing with the experimental data. Then the hydraulic hybrid system is applied to the original system, and the main parameters are matched; under the feedforward and pressure double control scheme, the power matching of the modified model is studied. The results of the simulation test shows that ： under the control scheme of feed forward and pressure, the diesel engine installed power can be reduced, and the output power can basically work in the high fuel efficiency zone.