【作者】 孙文凯；

【导师】 刘旺；

【作者基本信息】 武汉科技大学 ， 机械制造及其自动化， 2007， 硕士

【摘要】 日益严峻的能源危机和环境危机促进了电动汽车产业再次繁荣。对并联混合动力汽车的研究开发,有力地促进电动汽车产业的发展。本文首先介绍了电动汽车的特点及共性关键技术,介绍了并联混合动力汽车的特点及其分类。指出建模仿真技术在包括并联混合动力汽车在内的电动汽车研发工作中的重要性,阐述整车控制策略是影响该类汽车性能的关键因素。确定论文研究的对象是并联混合动力汽车系统建模与并联混合动力系统工作模式切换时的转矩动态控制的仿真研究。基于MATLAB/Simulink软件平台,以描述法与查表法相结合,完成了某型并联混合动力汽车动力系统和传动系统中发动机、电动机和变速器等主要部件仿真模型的建立,确定了整车多能源动力总成控制系统的结构,为设计及验证整车控制策略提供了仿真环境。基于稳态逻辑门限的控制方法,以保证汽油机高效率运行为目的,对并联混合动力系统中的发动机、电动机目标转矩进行了预分配。通过分析并联混合动力系统的工作模式及发动机、电动机的工作特性,指出在混合动力系统模式切换时对系统输出转矩进行动态控制的必要性,设计了以混合动力系统转矩预分配策略为基础,以转矩动态控制策略为核心的并联混合动力系统整车控制策略,完成了整车多能源控制系统的设计,建立了整车仿真模型。在新欧洲驾驶循环工况下,通过运行不含转矩动态控制策略的整车模型,证明了所建仿真模型的正确有效性。通过并联混合动力系统工作模式切换的5种定工况仿真以及加速、减速制动2种全工况仿真,通过对比分析模式切换时有无转矩动态控制的相关仿真结果,证明了转矩动态控制策略在并联混合动力系统工作模式切换过程中,能够较好地利用电动机响应迅速的优点来弥补发动机响应滞后的缺点,从而保证并联混合动力系统的输出转矩满足驾驶员转矩的需求,保证了汽车的动力性,同时也能保证传动系统动力传递的平稳。更多还原

【Abstract】 The crisis of energy and environment in the earth become worse, which hence flourish the industry of Electric Vehicle (EV) again. The researches on the Parallel Hybrid Electric Vehicle (PHEV) greatly promote the development of the EV industry.The characteristic and the general key technologies have been introduced in the paper firstly, and then the characteristic and the sort of the PHEV. It pointed out that the technology of modeling and simulation was essential to study on the EV, and the energy control strategy of PHEV was the key which affects the performance of the PHEV. The system modeling of PHEV has been determined as the study object of this paper, also the strategy of torque by dynamic control which took effect during the course of mode switching of parallel hybrid system.Based on the software platform of MATLAB/Simulink, the major simulation model of the certain PHEV dynamic system and the transmission system have been established by the way of describing and look-up table, such as the gasoline engine, the electric motor and the gearbox, and so on. The structure of the multi-energy powertrain control system of the PHEV has been also determined. It provided the simulation environment for design and testing the control strategy of the PHEV.The target torque of the engine and the electric motor in the parallel hybrid powertrain have been preassignment by the method of logic threshold control on stable state to insure that engine could operate in high efficiency. The working pattern of the hybrid system and the work attribute of the engine and the electric motor have been all analyzed, and the conclusion that the torque should be controlled in dynamic state. And then, the control strategy which based on torque by dynamic control for the PHEV has been designed, and also the multi-energy control system. Finally, the simulation model of the PHEV has been established.The simulation model of the PHEV only exclude the strategy of torque by dynamic control has been certified correct and valid with the New European Driving Cycle (NEDC). The vehicle simulation model has been simulated with (or without) the strategy of torque by dynamic control by 5 certain operating conditions during the course of the operating modes of hybrid powertrain switching and 2 kinds of whole operating conditions of acceleration and deceleration. The comparative analysis confirmed that the strategy of torque by dynamic control could make use of the advantage that electric motor response to the signal of torque demand rapidly to make up for the shortcoming of the engine response to the signa of torque demand slowly . The strategy insured that the torque output by hybrid powertrain could accord with the driver’s torque demand, and the strategy also guaranteed that the torque transmission of hybrid powertrain was stable.更多还原