并联混合动力挖掘机系统建模及控制策略仿真

Modeling and Control Strategy of Parallel Hybrid System in Hydraulic Excavator

摘要:

分析了以超级电容和ISG(integrated starter generator)电机组成辅助动力源、电机驱动回转为特征的并联混合动力挖掘机系统；提出了发动机双模式转矩均衡控制策略，以负载工况与超级电容SOC(state of charge,荷电状态)为决策依据，实现发动机工作点的自适应调节.在特定工作点下，以转矩均衡控制策略替代传统的转速感应控制，系统转速更加稳定.ISG电机可以均衡发动机转矩，使其工作于高效率区.另外，利用回转驱动电机实现回转势能的再生利用.建立并联混合动力挖掘机系统的Simulink仿真模型.结果表明，该控制策略适用于挖掘机并联混合动力系统，具有显著的节能性.

Abstract:

An analysis was made for a parallel hybrid excavator system with ultra capacitor and ISG (Integrated Starter Generator) as auxiliary electrical power source and characterized by motor-driven slewing mechanism.A dual-mode engine torque balancing control strategy was proposed,and the load condition and the SOC(state of charge) of ultra capacitor were employed as decision-making basis to adapt the engine operating point.At a specific point,the torque balancing control strategy was adopted instead of the traditional speed sensing control,thus the system could be more stable. ISG motor can balance the engine torque to make it work in high efficiency area.In addition,the slewing mechanism-driven motor can recycle Potential energy.A simulink simulation model of the parallel hybrid excavator system was set up.Results show that the control strategy is suitable for parallel hybrid power system excavator with significant energy saving.