【作者】 张宇；

【导师】 孟顺；

【作者基本信息】 合肥工业大学 ， 动力机械及工程， 2024， 硕士

【摘要】 混合动力汽车因结合了燃油汽车与电动汽车的优点,可以有效地解决续航焦虑,因而得到广泛应用。混合动力汽车热管理系统结构和控制策略复杂,合理的分析和利用热管理系统各回路之间的耦合关系可以有效解决热管理需求,提升车辆的动力学、经济性及舒适性。本文以某款混合动力汽车为研究对象,建立了整车热管理系统的计算模型和控制策略,分析了不同环境温度、不同荷电状态(state of charge,SOC)对整车热管理系统性能的影响,获得了发动机及电池的能量流及主要部件的能耗情况。利用AMEsim与Matlab/Simulink联合仿真平台,建立了整车热管理系统模型,搭建了发动机子系统、电池子系统、电机子系统和空调系统的热管理控制策略,实现了混合动力汽车整车热管理系统的动态仿真;利用车辆热管理系统测试数据,对部件和热管理系统进行了标定。利用联合仿真计算模型,开展了电池加热、空调制冷和电驱系统冷却过程分析,明确了热管理子系统制热模式和制冷模式的运行原理。针对整车热管理系统,开展了高温和低温环境下的热管理系统性能分析,在标准循环工况C-WTVC下,对不同环境温度(-20℃、-10℃、0℃、35℃、40℃、45℃)、不同初始电量SOC(70%、30%)下车辆主要部件的运行温度进行了仿真研究,结合动力系统的运行模式,分析了环境温度及SOC对发动机冷却系统、电池热管理系统和电驱冷却系统的主要参数影响变化规律。结果表明:高温条件下,随着环境温度的升高发动机及电驱系统冷却液温度升高,空调制冷能力下降,电池及乘员舱温度下降较慢。低温条件下,随着环境温度的降低,电驱系统及发动机冷却液温度上升的较慢,PTC及发动机余热利用的时间逐渐加大。随着初始SOC的降低,电驱系统及发动机冷却液温度上升较快,电池温度变化的速度下降。采用热管理系统能量流分析方法,针对C-WTVC工况,分析了不同环境温度(-20℃、-10℃、0℃、20℃、35℃、40℃、45℃)、不同初始电量SOC(70%、30%)下热管理系统能量流和能耗分布情况。研究发现,高温环境下,随着环境温度的上升,发动机的能耗保持相对稳定,动力电池的能耗主要用于P3电机的动力输出和满足压缩机的制冷需求;低温环境下,动力电池能量主要用于P3电机的动力输出和满足PTC加热的需求。更多还原

【Abstract】 Hybrid vehicles can effectively address range anxiety because they combine the advantages of fuel and electric vehicles and can effectively address range anxiety.The structure and control strategy of the thermal management system of hybrid vehicles are complex,and reasonable analysis and use of the coupling relationship between the circuits of the thermal management system can effectively solve the thermal management needs and improve the dynamics,economy and comfort of the vehicle.This dissertation takes a certain hybrid vehicle as the research object,establishes the calculation model and control strategy of the thermal management system of the whole vehicle,analyses the influence of different ambient temperatures and different battery state of charge(SOC)on the performance of the thermal management system of the whole vehicle,and obtains the energy flow of the engine and the battery as well as the energy consumption of the main components.Using the joint simulation platform of AMEsim and Matlab/Simulink,the thermal management system model of the whole vehicle was established,the thermal management control strategies of the engine sub-system,battery sub-system,motor sub-system and air-conditioning system were constructed,and the dynamic simulation of the thermal management system of the whole vehicle of the hybrid vehicle was realized;and using the test data of the thermal management system of the vehicle,the calibration of the components and the thermal management system was carried out.Using the joint simulation calculation model,the analyses of the battery heating,air conditioning and cooling and the cooling process of the electric drive system were carried out,and the operating principles of the thermal management subsystem in the heating and cooling modes were clarified.For the thermal management system of the whole vehicle,the performance analysis of the thermal management system under high and low temperature environments was carried out,and the simulation study of the operating temperatures of the main components of the vehicle under different ambient temperatures(-20°C,-10°C,0°C,35°C,40°C,45°C)and different initial power SOC(70%,30%)was conducted under the standard cycle condition C-WTVC,and the operating modes of the power system were combined to analyze the impact of the ambient temperature and SOC on the engine cooling system,battery thermal management system,and the battery thermal management system.Combined with the operation mode of power system,we analyzed the change rule of the influence of ambient temperature and SOC on the main parameters of engine cooling system,battery thermal management system and electric drive cooling system.The results show that,under high-temperature conditions,the coolant temperature of the engine and electric drive system rises with the increase of ambient temperature,the cooling capacity of the air conditioner decreases,and the temperature of the battery and the passenger compartment decreases more slowly.Under low-temperature conditions,as the ambient temperature decreases,the electric drive system and engine coolant temperatures rise more slowly,and the duration for PTC and engine waste heat utilization gradually increases.As the initial SOC decreases,the electric drive system and engine coolant temperatures rise more rapidly,and the rate of battery temperature change decreases.Using the thermal management system energy flow analysis method,the thermal management system energy flow and energy consumption distribution were analyzed under different ambient temperatures(-20°C,-10°C,0°C,20°C,35°C,40°C,45°C)and different initial power SOC(30%,70%)for the C-WTVC operating conditions.It is found that at high temperatures,the energy consumption of the engine remains relatively stable as the ambient temperature rises,the energy consumption of the power battery is mainly used for the power output of the P3 motor and to satisfy the cooling demand of the compressor;At low temperatures,the power battery energy is mainly used for the power output of the P3 motor and to satisfy the demand of the PTC heating.更多还原