并联式混合动力液压挖掘机动力源特性研究

针对液压挖掘机在15s的一个典型工作周期下的工况,分析液压挖掘机的工况特点,建立并联式混合动力液压挖掘机动力源部分的数学模型,提出一种并联式混合动力液压挖掘机动力参数的优化组合配置,研究空间矢量脉宽调制(SVPWM)控制的永磁同步电机（PMSM）以及NiMH电池组在典型工作周期下的发电/电动、充电/发电能量转化效率、电机转速、转矩等动态响应特性以及SOC变化特性.仿真结果表明,该优化组合的动力总成能满足液压挖掘机动力需求和能量转化效率要求,能提升整机系统的油耗特性,并且电池系统只充当能量交互的媒介,实现液压挖掘机的高效节能的控制.

Dynamic characteristic of power source in parallel hybrid hydraulic excavator

The working condition property of the hydraulic excavator was analyzed based on the 15 second typical operating cycle. The mathematical model of power source in parallel hybrid hydraulic excavator was established. An optimal set of power source parameters in parallel hybrid hydraulic excavator was proposed. Then the generator/motor efficiencies of the space vector pulse width modulation (SVPWM)-controlled permanent magnet synchronous motor (PMSM) and the charge/discharge efficiencies of the NiMH battery were analyzed under the same circumstance as well as the dynamic response characteristic including motor speed, motor torque and battery SOC. Simulation results show that the optimal set of power source in powertrain can satisfy the requirement of power and energy transformation efficiency for hydraulic excavator, and help achieve better fuel consumption with hybrid configuration. Furthermore the battery system was only treated as a media to transform energy. The more energy-saving and higher efficient control for the hydraulic excavator was achieved.