【作者】 周丹；

【导师】 过学迅；

【作者基本信息】 武汉理工大学 ， 车辆工程， 2011， 硕士

【摘要】 机械式自动变速器是在机械式变速器基础上进行改造,增添自动变速操纵部分,是一种新型的自动变速器,秉承了液力自动变速器操纵方便的优点,同时具有机械式变速器高效率、低成本、易于制造、工作可靠等优点。目前,对于传统汽车自动变速理论及换挡规律的研究已经成熟,先后提出双参数换挡规律、动态三参数换挡规律及最佳同步换挡规律。现阶段AMT多采用双参数换挡规律,即节气门开度和车速作为换挡控制参数。混合动力汽车方面的研究日渐成熟,研究的重点是整车控制策略,即发动机与电机的转矩分配,很少有针对混合动力换挡规律的研究,几乎所有的混合动力汽车都采用传统的双参数换挡规律。然而,混合动力汽车在系统结构和工作原理上与传统汽车有较大差别,并不能单单以双参数来控制换挡。在爬坡或加速工况,由电机和发动机联合驱动车辆；在减速制动工况,由电机发电,回收制动能量。因此,混合动力汽车换挡规律研究当中必须要考虑电池和电机的影响。同时,电机的功能随工作模式而变化,故不同的工作模式下,换挡规律应当不同。本文依托与中国汽车工程研究院合作项目,首先介绍了混合动力客车及混合动力汽车机械式自动变速器应用现状,同时阐述了混合动力汽车AMT换挡规律的研究背景和意义。通过对传统汽车AMT换挡规律研究,得出单轴式并联混合动力汽车双参数换挡规律,在传统汽车换挡规律研究基础上,根据混合动力汽车动力系统特点,提出由发动机转矩(或节气门开度)、电机转矩(或“油门”)和车速控制的三参数换挡规律,分别得出最佳动力性和最佳经济性三参数升挡规律,讨论了驱动模式三参数降挡规律,并针对混合动力动力系统特点,给出制动模式下最佳经济性降挡规律。将所求换挡规律在advisor软件中进行仿真,利用单轴并联混合动力客车双参数与三参数换挡规律进行比较分析,突显三参数换挡规律优势。更多还原

【Abstract】 The automatic mechanical transmission (i.e. AMT) makes the transformation in the foundation of mechanical transmission, adding the self-shifting operation part. It is a new kind of automatic transmission, has received the advantage of hydraulic automatic transmission on convenient operation, and simultaneously has the performance of mechanical transmission:high efficiency, the low cost, easy to make, operation reliable and so on.At present the research on shift schedule on conventional car automatic mechanical transmission is already mature, coming up with the double parameter shift schedule, the dynamic three parameters shift schedule and the best synchronization shift schedule. At the present stage, AMT always uses the double parameter shift schedule, namely the throttle percentage and the vehicle speed as shifting control variable. Working on Hybrid Electric Vehicle (i.e. HEV) is mature day after day, but the research key point is the almost the vehicle control policy, namely the distribution of engine and electrical machinery’s torque, rarely directing at the HEV shift schedule research, so almost the HEV uses the double parameter shift schedule. However, HEV has the wide difference in the system structure and the operation principle with the traditional automobile, cannot solely control by the double parameter to shift. In hill climbing or acceleration operating mode, operate by electrical machine and engine compound; in the retarding brake operating mode, generate electricity by the electrical machine to recycling brake energy. Therefore, study on HEV shift schedule probably considers the battery and electrical machine’s influence. At the same time, the function of electrical machine changes along with the working mode, therefore under the different working mode, shift schedule should be different.The paper depends on the cooperative project with China Automotive Engineering Research Institute. Firstly, introduce the application of HEV and HEV AMT, simultaneously elaborated the research background and the significance of HEV AMT shift schedule.Through the research on shift schedule of traditional automobile AMT, obtain double-parameter-controlled shift schedule of the single axle type parallel HEV. In the research foundation of traditional automobile shift schedule, proposed the three-parameter shift schedule controlled by the engine torque, the motor torque and the vehicle speed according to HEV dynamic system characteristic, obtain the best dynamic property and the best economical efficiency three-parameter upward shift schedule, and aiming at HEV dynamic system characteristic, specially put forward the best economical efficiency three-parameter downward shift schedule under the brake mode.Using the shift schedules carry on the simulation in the advisor software, analyze and compare the result of the double-parameter and three-parameter shift schedules of the single-axle parallel HEV, protrude the superiority of three-parameter shift schedule.更多还原