【作者】 董鹏；

【导师】 吴斌； 吴加加；

【作者基本信息】 北京工业大学 ， 动力工程（专业学位）， 2017， 硕士

【摘要】 随着当前环境污染和能源短缺问题的日益严重,节能减排成为目前主要的解决方法,对于汽车行业也是如此。传统发动机存在燃料燃烧的过程,使得汽车排放成为主要的污染源之一。发展新能源汽车则是一种解决汽车排放的重要途径,电动汽车作为绿色汽车,已越来越受到大家的关注,在国家政策和环境压力下,纯电动汽车技术取得了快速发展。目前纯电动汽车考虑到成本和结构布局因素,驱动系统主要采用固定速比的减速器,单一挡位不能较好地满足汽车加速、爬坡和超车等多种驾驶需求。多挡位变速器能较好地解决这方面问题,但同时也存在换挡动力中断的问题,影响驾驶的舒适性,针对此问题提出无动力中断换挡策略,并进行实验台架验证。首先根据整车性能要求,计算匹配整车动力系统的参数,并确定电机和变速器的类型和主要参数。在AVL CRUISE软件上对匹配的整车性能参数进行仿真验证,包括最高车速,加速时间和爬坡度,仿真结果显示所设计驱动系统参数满足整车性能要求,证明了其参数匹配的合理性。然后搭建双电机AMT驱动系统的实验台架,对实验设备进行标定并验证台架的可靠性。以无动力中断换挡为控制目标,提出双电机输出转矩协同控制策略,并采用基于模型的方式在MATLAB/Simulink软件上开发控制策略模型。在搭建好的实验台架上对建立的控制策略模型进行验证,实验结果表明,双电机转矩协同控制在换挡时可以减小变速器输出轴的转速波动,维持变速器的转矩输出,验证了双电机无动力中断换挡的可行性。最后对单电机两挡变速器驱动系统进行循环工况实验,计算工况下的能量消耗.同时用动态规划算法对原换挡曲线进行优化,提高了整车的经济性能。更多还原

【Abstract】 With the increasingly serious problem of environmental pollution and energy shortage,energy saving and emission reduction has become a major solution.The traditional engine has the process of fuel combustion,which makes the vehicle emission become one of the main pollution sources.The development of new energy vehicles is an important way to solve the vehicle emissions,electric vehicles as a green car,has been more and more attention.In the national policy and the environment under the pressure,the pure electric vehicle technology has made rapid development.In consideration of cost and structure layout in pure electric vehicle at present,driving system mainly adopts the fixed ratio reducer,single gear cannot meet the driving requirements for automobile acceleration,climbing and overtaking.Multi gear transmission can solve this problem,but there are also problems of interruption of traction force in shift process,the driving comfort is reduced.Therefore this article put forward the new uninterrupted shift strategy,and bench experiments are verify by construction test system.Firstly,according to the requirements of vehicle performance,calculated parameters of the vehicle power system,determine the type and main parameters of motor and gearbox.Vehicle driving performance parameters were simulated in CRUISE software,including the maximum speed,acceleration time and climbing,the simulation results show that meet the requirements of the performance of the vehicle,to prove the matching parameters are rationality.The experimental bench is built which dual-motor AMT of drive system,the platform validity is verified by measuring test devices.Uninterrupted shift as the control target,put forward a dual-motor output torque coordination control strategy,and base model designed control strategy model in MATLAB/Simulink software.After building the experiment bench,the control strategy of the model is verified.The test results show that the dual-motor torque coordination control can reduce the speed fluctuation of the transmission output shaft during the shifting,and maintain torque transmission,verify the feasibility of dual-motor uninterrupted shift.Finally,making the driving cycle experiment of single motor two gear drive system,the energy consumption of cycle is calculated.Meanwhile the original shift curve was optimized using dynamic programming algorithm,this mean can improve the economic performance of the vehicle.更多还原