【作者】 刘立强；

【导师】 王启瑞； 陈无畏；

【作者基本信息】 合肥工业大学 ， 车辆工程， 2005， 硕士

【摘要】 本文利用可测得输出反馈来设计控制策略,实现汽车电动助力转向系统(EPS)与主动悬架系统(ASS)的集成控制。首先,对1/4汽车转向工况下悬架系统的运动特性进行了仿真研究:接着,建立了整车的转向与悬架综合模型,设计了一种LQG控制策略,改善了车身横摆角速度、车身垂直加速度和车身侧倾角等的输出响应;再次,加入了汽车EPS系统,建立了EPS与ASS综合模型,设计了输出反馈的随机次优控制策略,提高了转向时的轻便性、操纵稳定性、行驶平顺性和安全性;然后,采用输出反馈的最优滑模变结构控制策略,设计了EPS与ASS的集成控制系统并进行了仿真研究,结果表明所设计的集成控制策略不仅能提高操纵轻便而且能较好地抑制车身姿态变化:最后,详细介绍了集成控制器的单片机硬件电路设计和软件程序的流程,并进行多种工况下的道路试验,试验结果证明了所设计的集成控制器的有效性和可行性。更多还原

【Abstract】 The dissertation aims to realize the integrated control of the vehicle Electric Power Steering and Active Suspension System based on the control scheme of output feedback. Firstly, a simulation of a 1/4 car dynamic model is given under steering situation. Secondly, based on the integrated model of the steering and active suspension presented, an extensive regulator of active suspension LQG control is designed to complete the control of the yaw rate, vertical acceleration, pitch angle and roll angle of the car body. Combining automotive Electrical Power Steering System (EPS) model and steering model with Active Suspension System (ASS), a full car dynamic model is set up. Based on the integrated model, the Random Sub-Optimal integrated Control of output feedback is presented to control the EPS and ASS. The presented control scheme improves vehicle maneuverability, handling, safety and ride performance. Thirdly, the optimal variable structure control scheme is presented. The simulation results confirm that the control scheme not only can improve the maneuverability, but also can control the position of the body. Finally, the dissertation particularly introduces the process of designing the SCM hardware and software, then the tests are carried out under different situations, the test results prove the validity and feasibility of the integrated controllers and that the models are correct.更多还原