【作者】 罗福祎；

【导师】 王增才；

【作者基本信息】 山东大学 ， 车辆工程， 2007， 硕士

【摘要】 悬架系统是汽车的重要组成部分，对汽车的操纵稳定性及乘坐舒适性有很重大影响。传统的被动悬架由于其自身的固有局限性而无法根据路面及行驶状况的变化做出适当的调整从而使汽车的整体行驶性能达到最佳。电子控制空气悬架在车辆行驶过程中，其刚度可以根据路况和需要进行调节，对提高汽车行驶平顺性、操纵稳定性以及减轻对路面的破坏具有显著的效果。美国、日本和欧洲等发达国家已经在高档客车上普及空气悬架，然而，我国目前还处在空气悬架引进、消化阶段，空气悬架控制策略方面的研究也很少，但空气悬架车辆在中国的市场前景非常乐观，因此展开对空气悬架的性能研究、匹配设计和控制策略的探讨就具有巨大的意义了。本文正是在这种需求下，展开对商用车空气悬架智能控制策略的研究。作者首先对电控空气悬架的结构和可变刚度特性进行了详细分析，然后针对空气悬架的特点在Matlab2006中的Simulink下建立了空气弹簧模型，并在Matlab2006中的Simulink及SimMechanics工具箱中建立了车辆静态模型、空气悬架控制系统动力学模型，在此基础上用Matlab2006中Stateflow工具箱编写了控制策略，于车辆模型连接对空气悬架的主要功能进行了模拟仿真；并搭建了空气悬架仿真试验台，通过将空气悬控制策略注入以XC164CM为核心的ECU实现了空气悬架的各种基本功能，同时也检验了空气悬架控制系统动力学模型的正确性。紧接着在上面工作的基础上提出了利用空气悬架对车身平衡进行调节可大大降低车辆倾翻的可能。对车辆发生事故危险性较高的倾翻工况进行了分析，并列举了目前减小车辆侧翻事故的几种方法，针对空气悬架特点设计了控制器。通过在时域内对仿真结果进行分析可知，空气悬架能够在车辆转弯时降低车辆质心高度，减小侧倾角，同时提高倾翻阀值，有效地降低了车辆倾翻的可能。最后建立车辆爆胎模型，对车辆爆胎进行了模拟，通过空气悬架判断车辆爆胎后ECU采取相应的控制策略，自动对车辆四个轮胎分別进行制动，同时降低车身高度，调节车身姿态，提高车辆稳定性。结果证明所采用的控制方法能够实现商用车空气悬架的功能，能够提高商用车的行驶平顺性和操纵稳定性。更多还原

【Abstract】 Suspension system is the important portion of vehicle; it plays an extremely important part in improving vehicle ride comfort and handling stability. The passive suspension system is only a compromise between ride comfort and handling stability, because of the spring and the damper are not controllable. But the electronically controlled air suspension can adjust its rigidity according to the state of roads and needs to carry on, so it has the remarkable effect in enhancing the automobile smooth running, the operation stability as well as reduce to the road surface destruction. The air suspensions have already been popularized in the High-grade commercial buses in many developed countries, such as US, Japan and Europe etc. However, at present our country also occupies the air suspension introduction, the digestion stage. The air suspension control strategy was researched very few, but the vehicles with air suspension are extremely optimistic in China’s market prospect. Therefore it has the huge significance which launches to the air suspension performance research, the match design and the discussion of controlling strategy.In this need, this paper studies the controlling strategy of intellective air suspension. First, we analyzed the structure and alterable rigidity of the electronically controlled air suspension. Then this paper sets up air suspension model and vehicle model to establish the state equation according to moving differential equation. Then in the time domains, the author simulates three main working conditions: static state, vehicle rollover and tire blow-out. We also set up the test-bed of the air suspension to validate the model, and make the ECU of air suspension using XC164CM. The basal functions of the electronically controlled air suspension were achieved on the test-bed. Next, for the commercial vehicle rollover more an more happening, a preventing the rollover method is proposed. The method with air suspension enhances the rollover threshold and reduces the danger of the vehicle rollover. We make up the vehicle rollover model and compile the controller. From the result of the emulator, we can see the effort of the semi-active air suspension on vehicle rollover stability. Last, this paper simulated the tire blow-out, analyzed the state of the vehicle. The electronically controlledair suspension can improve vehicle ride comfort and handling stability.更多还原