单轴并联式混合动力汽车动力系统转矩分配策略研究  

Study on Torque Distribution Strategy of Power System of Single Axis Parallel Hybrid Power Vehicle

作　　者：付翔[1,2,3] 袁雷 纪剑 

机构地区：[1]武汉理工大学汽车工程学院,湖北武汉430070 [2]现代汽车零部件技术湖北省重点实验室,湖北武汉430070 [3]汽车零部件技术湖北省协同创新中心,湖北武汉430070

出　　处：《公路交通科技》2018年第1期129-136,共8页Journal of Highway and Transportation Research and Development

基　　金：新能源汽车科学与关键技术学科创新引智基地项目(B17034)

摘　　要：针对单轴并联式混合动力汽车,以发动机万有特性和动力电池荷电状态(SOC)为依据,提出了基于能量平衡的逻辑门限的转矩分配控制策略。利用CVT传动系统传动比可连续变化的特性调整发动机工作在高效区,根据发动机万有特性图划分动力系统的工作区间,确定了各工作区间临界阈值参数,制定出整车动力系统控制规则,实时切换了动力系统的工作模式。在不同工作模式下通过确定发动机、驱动电机的最佳工作区对整车需求转矩进行了合理分配,达到提高动力系统的能量利用效率的目标。最后对具有相同动力系统的传统车和该混合动力汽车分别进行了经济性仿真,基于Cruise与Matlab/Simulink仿真平台对提出的转矩分配控制策略进行了联合仿真验证。仿真结果表明:基于能量平衡的逻辑门限的转矩分配策略能够在满足整车动力性的前提下,改善发动机的工作点,增加在高负荷区工作的概率,降低燃油消耗量,提高整车的经济性,并保持动力电池组SOC的波动在高效区内,提高了动力电池的充放电效率,延长其使用寿命。According to the engine universal characteristics and the state of charge （SOC） of battery of single axis parallel hybrid electric vehicle, a torque distribution control strategy based on the logic threshold of energy balance is proposed. The characteristic of continuous change of the transmission ratio of the CVT system is used to adjust the engine to work in the high efficiency zone. According to the engine＇s universal characteristic diagram, the working zones of the power system are divided. The critical threshold parameter value is determined, and the power system control rule of the vehicle is developed to real time switching the working mode of the power system. In different working modes, the demanded vehicle torques are reasonably distributed by determine the best operating areas of the engine and the motor to achieve the goal of increasing the energy utilization efficiency of the power system. Finally, the economic simulations of the traditional vehicle and the hybrid power vehicle with the same dynamic system are carried out. Based on Cruise and Matlab/Simulink simulation platform, the proposed torque distribution control strategy is co-simulated and verified. The simulation result shows that the energy balance logic threshold based torque allocation strategy can satisfy the vehicle dynamics, improve the working points of the engine, increase frequency of working in high load area, reduce fuel consumption, improve the vehicle economy, and keep the change of the power battery SOC in high efficiency range. Thus the charging and discharging efficiency of the power battery are improved and operational life span is prolonged.

关 键 词：汽车工程 转矩分配 联合仿真 动力系统 逻辑门限 工作模式 电池SOC 

分 类 号：U469.7[机械工程—车辆工程]