分布驱动式电动汽车电池系统分布形态对能耗特性影响的研究

A Study on the Effects of Distribution Pattern of Battery System on the Energy Consumption Characteristics of Distributed Drive EV

针对分布式四轮驱动纯电动汽车,分析具有不同分布形态的电池系统能耗特性。选取Rint等效电路模型建立电池系统内阻损耗模型,通过理论计算分析分布式电池系统与集中式电池系统的能耗特性。然后基于AMESim/Simulink软件建立了电动汽车能耗特性仿真平台,并以驱动能量消耗最少为控制目标,对前后轴驱动电机转矩进行最优分配控制,在NEDC循环工况下对电池系统内阻损耗进行仿真。理论和仿真分析结果均表明:在分布式驱动情况下,采用集中式电池系统时的能耗特性优于分布式电池系统,且分布式电池系统会产生SOC不一致的问题,从而导致车载充电系统设计的复杂化。

The energy consumption characteristics of battery system with different distribution patterns are analyzed for four-wheel distributed drive electric vehicles, a model for the energy consumption on the internal resistance of battery system is built based on Rint equivalent circuit model, and the energy consumption characteristics of both distributed and centralized battery systems are analyzed by theoretical calculation. Then a simulation platform for the energy consumption characteristics of electric vehicle is set up with AMESim/Simulink software, and aiming at the optimal torque distribution of driving motors in both front and rear axles with minimizing driving energy consumption as objective, a simulation on the energy consumption on the internal resistance of battery system is conducted with NEDC driving cycle. The results of both theoretical analysis and simulation indicate that the energy consumption characteristics with centralized battery system is superior to that with distributed system, which also has a problem of inconsistent SOC, leading to the complexity of on-board charging system design.