【作者】 李海波；

【导师】 何天明；

【作者基本信息】 武汉理工大学 ， 车辆工程， 2008， 硕士

【摘要】 电控机械式自动变速器(Automated Mechanical Transmission,AMT)是一种新型的自动变速器,其通过对手动固定轴线式变速器和干式摩擦离合器的自动化改造从而实现了选挡、换挡以及离合器和油门的自动操纵。研究和开发适合越野车装备的AMT,不仅符合我国国情,而且还可以实现越野车辆的自动化改造,提高越野车的战斗力。换挡规律是AMT的灵魂,它是判断换挡时机的依据。在应用中,通过将采集到的车辆行驶状态与换挡规律相对比,从而判断是否达到最佳的换挡点并自动执行换挡操作,这样大大减轻了驾驶员的疲劳,提高行驶安全,同时使整车具有较好的动力性及燃油经济性。本论文选择动态三参数换挡规律应用在装有AMT的越野车上,研究目的是为了提高越野车的动力性和燃油经济性及通过性。根据控制参数可以分为单参数换挡规律、两参数换挡规律和三参数换挡规律。本文按照换挡模式可以分为越野模式换挡规律和平地模式换挡规律。本文主要研究基于越野模式和平地模式的动态三参数换挡规律。通过对越野模式下的动力学分析,建立越野车行驶方程式,并根据越野车行驶方程式研究动力性换挡规律的制定方法,包括图解法、解析法,并实际制定了各挡间的最佳动态三参数最佳动力性换挡规律曲面;建立了平地模式下燃油消耗方程式,据此研究了燃油经济性换挡规律的制定方法及改进的制定方法;考虑到越野车质量对换挡规律制定的影响,提出一种变结构的最佳换挡系统,丰富了换挡规律理论。利用仿真软件MATLAB/SIMULINK对所需的越野车传动系统建立了仿真模型,并简要的介绍了各个模块的工作原理和内部原理;最后利用所建立的系统仿真模型,将越野模式下改进过和未改进的动态三参数最佳动力性换挡规律应用于整车的换挡仿真,以比较其对越野车动力性的影响;将平地模式下定结构和变结构越野车质量选择相应的动态三参数最佳燃油经济性换挡规律应用于整车的换挡仿真,以比较其对越野车燃油经济性的影响;仿真结果表明本论文所建立的基于换挡模式的动态三参数换挡规律应用在越野车上是合理的。更多还原

【Abstract】 Automated Mechanical Transmission, as so called AMT, is a new-style transmission system. AMT technology applies the automatic technology to the manual mechanical transmission and makes the selection-gear, shift, clutch and throttle implement automatically. Therefore, research and development of AMT suitable for Off-road vehicle not only fits the situation of our country, but also can realize automatization-alteration and improve battle effectiveness of the Off-road vehicle.Shift schedules decide the time to shift and are the soul of the AMT. When the AMT is working, by comparing the states of the vehicle with the optimal shift schedules, the AMT decides the optimal shift time and achieves the shift automatically. This will lessen the tiredness of the driver and improve the safety. At the same time, the power and fuel-economy of the vehicle can also be improved. The author chooses the optimized dynamic 3-parameter shift schedule to apply in the Off-road vehicle equipped with AMT and the main study aim of this thesis is to improve the power, trafficability, and fuel-economy of the vehicle.The control parameter of shift schedule can be divided into single-parameter, 2-parameters and 3-parameters. According to the shift mode, shift schedule can be classified into off-road and flat shift schedule. The research of this thesis is focused on the 3-parameter dynamic shift schedule based on off-road and flat shift mode.Through making dynamics analysis in the off-road mode, established driving equation, and did some research on the methods making dynamic shift schedule in accordance with this formula, including graphic method and analytic method, and practically make optimal 3-parameter dynamic shift schedule surface; established fuel consumption equation of the flat mode, and did some research on the methods making fuel-economical shift schedule and improved methods; In order to solve the influence of mass on the shift schedule, the author presents a variable-structure-controlled shift system. This enriches the theory of shift schedules.In this thesis, the author uses the simulation toolbox MATLAB/SIMULINK to set up the simulation model for shift schedules. The operating principle and implementation of each block under the model were introduced too. The improved and unimproved dynamic and fuel-economical shift schedules in the two mode were used respectively in the processes of simulation-based evaluation, and do some comparisons. Using this model, the 3-parameter dynamic shift schedule based on off-road and flat shift mode are simulated and proved to be reasonable.更多还原