一种新型并联混合动力系统的性能研究

RESEARCH ON THE PERFORMANCE OF A NOVEL PARALLEL HYBRID POWERTRAIN

提出了一种新型并联混合动力系统,其采用PX型单环路系统,可有效规避无级变速器的扭矩和功率容量,通过串联两挡变速器,扩大该PX型单环路系统的调速范围。针对再生制动模式,对PX型单环路系统的功率流可逆性进行了验证。该新型并联混合动力系统采用电动机以实现纯电动驱动和制动能量回收,高速重载时发动机和电动机同时驱动车辆。建立了该动力传动系统的键合图模型,并推导了其状态方程。以Matlab/Simulink为平台建立了整车仿真模型,选取US06驾驶循环的高速公路工况,对该动力传动系统进行了仿真。仿真结果表明:通过模式切换,该并联混合动力系统确保了发动机工作在其高效率区域,车辆实际运行速度能够较好的跟随循环工况,同时,仿真前后电池荷电状态保持在期望范围内。

A novel parallel hybrid powertrain was proposed.The PX type single-loop system was adopted.It could effectively avoid the CVT’s torque and power capacity.By serially connection to 2-speed gearbox,The PX type single-loop system ratio spread was enlarged.For regenerative braking mode,the power flow reversibility of the PX single loop system was verified.The electric motor was used to realize pure electric drive and recovery braking energy.At high speed and heavy load,the vehicle was driven simultaneously by the engine and the motor.The bond graph model of the powertrain was established,and the state equation of the system was given.Based on MATLAB/Simulink,the vehicle simulation model was established,and the highway portion of the US06 drive cycle was selected to simulate the powertrain.The simulation results show that:through mode switch,engine operates in high efficiency areas,and the actual speed of the vehicle can well follow the driving cycle.At the same time,the battery state of charge is ensured in the expected range before and after the simulation.