【作者】 黄诚；

【导师】 胡明辉； 董其慧；

【作者基本信息】 重庆大学 ， 工程硕士（车辆工程领域）（专业学位）， 2016， 硕士

【摘要】 我国地域辽阔,拥有着世界上面积最大高原地域,随着海拔高度的增加,气候条件会随之改变。高原地区公路技术等级低,道路条件较差,同时由于地理条件的限制,道路的海拔落差会很大,高原公路会经常出现长上坡和长下坡的路况。因此,由于气候条件和道路条件的限制,汽车在高原地区行驶时的性能会大幅下降。本文开展了基于高原气候环境的AMT汽车换挡策略研究以及基于高原道路条件的换挡控制策略研究,旨在使AMT汽车进一步适应复杂的行驶环境,提高AMT汽车在高原地区行驶时的动力性和安全性。本文的主要内容包括:(1)利用GT-Power建立起了发动机模型,通过该模型获得发动机在高原地区的稳态数据,然后利用MATLAB/Simulink建立起了整车模型,为制定高原地区的AMT汽车换挡规律奠定了基础。(2)介绍了传统换挡规律的理论知识及其分类,并针对本文所研究车型分别制定了最佳动力性换挡规律和最佳经济性换挡规律。(3)论述了汽车在高原气候下运行需要模拟的环境条件,然后分析了由于环境条件的改变对发动机以及整车性能的影响,最后把环境因素带来的影响考虑到整车模型中,进一步分析整车的动力性和经济性。通过仿真分析可知,当选用平原下的最佳动力性和最佳燃油经济性换挡规律时,汽车的动力性和经济性均会出现不同程度的降低,因而需要针对高原气候条件制定专门的换挡策略,对汽车的高原性能进行改善。(4)针对汽车在高原地区行驶时性能会受到高原特殊气候和道路条件的影响而下降的问题,提出了基于不同海拔高度的换挡策略制定方法以及基于高原道路条件的换挡策略制定方法,并在最后对所提出的策略进行了验证。更多还原

【Abstract】 China has a vast territory, we have the largest plateau region in the world, and climate conditions will be changed with the increase of altitude. The technical level of plateau highway is low, and the road conditions are poor, at the same time, due to the restrictions of geographical conditions, the elevation drop of the road will be very large and plateau highway will often appear long uphill and long downhill road conditions. Therefore, due to climate condition and road condition, the performance of the vehicle in the plateau region will be significantly reduced.In this paper, a research on the shift strategy of AMT vehicle based on the plateau climate environment and the shift control strategy based on the plateau road conditions are carried out, the purpose is to make the AMT cars adapt to the complex driving environment and to improve the dynamic performance and safety of AMT cars in plateau area. The main contents of this paper include:(1)The engine model is established by using GT-Power, through this model, the steady state data of the engine in plateau area is obtained. Then establish the vehicle model by using MATLAB/Simulink to lay the foundation for the formulation of the AMT vehicle shift schedule in the plateau area.(2)The theoretical basis and classification of the traditional shift schedule are introduced, and optimal power shift schedule and optimal fuel economy shift schedule are formulated for the research vehicle.(3)This paper discusses the environmental conditions of the vehicle in the plateau climate, and then analyzes the influence of the change of the environmental conditions on the performance of the engine and the vehicle. Finally, analyze the vehicle’s performance and economy in the vehicle model. Simulation analysis shows that, when selecting the optimal power shift schedule and optimal fuel economy shift schedule, the power and economy of the vehicle will be reduced in different degrees. Therefore, it is necessary to develop the special shift strategy for the plateau climate to improve the performance of the vehicle driving on the plateau.(4)In the plateau area, the performance of the vehicle will be affected by the special weather and road conditions, the shift strategy formulation method based on different altitudes and road conditions is proposed in this paper. In the end, the proposed strategy is verified.更多还原