汽车ehb液压系统动态特性仿真与试验分析.docx

摘 要
当前车辆对制动性能的要求越来越高,电子液压制动系统 EHB (Electro Hydraulic Brake)作为一种新型的线控制动系统,弥补了传统制动系统的不足,提高了车辆的制动性能。汽车 EHB 液压系统作为汽车 EHB 系统的执行机构,其动态特性直接影响轮缸制动压力控制算法的设计, 对其工作特性的研究是开发汽车 EHB 系统的基础。因此,对汽车 EHB 液压系统的研究具有重要的研究意义与工程应用价值。本文完成的主要工作如下:
(1)基于 AMESim 和 Matlab/Simulink 联合仿真平台,对汽车 EHB 液压系统的动态特性进行了仿真研究,得到了电磁阀的响应特性以及汽车 EHB 液压系统的增压特性和减压特性,为汽车 EHB 液压系统的动态特性试验提供了理论依据;
(2)搭建了汽车 EHB 系统试验平台,试验平台包括汽车 EHB 液压系统试验台和汽车 EHB 液压系统的动态特性测试系统,测试系统包括硬件设计和软件设计。汽车 EHB 液压系统的动态特性测试系统实现了基于 CAN 总线的上位机(PC)和下位机(单片机)的通讯和电磁阀的控制以及轮缸制动压力数据的采集;
(3)基于汽车 EHB 液压系统试验平台,对汽车 EHB 液压系统的动态特性进行了试验研究, 试验结果验证了基于 AMESim 所建立的汽车 EHB 液压系统仿真模型的正确性,得到了电磁阀的开关响应时间以及汽车 EHB 系统轮缸制动压力控制的 MAP 图。
关键词:EHB 液压系统,动态特性,模型,仿真研究,试验研究
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Abstract
At present, the requirements of the brake performance e higher and higher. The deficiency in traditional brake system can be made up by EHB(Electronic Hydraulic Brake System)as one of the new-boomed system, and the braking ability can be improved. The design for the control algorithm of brake chamber pressure is affected by the dynamic characteristic of hydraulic system, which is the executive part of automobile EHB. So the research on the dynamic characteristic of hydraulic system is basis for the design of automobile EHB system. Therefore the research on hydraulic system is significant and indispensable. The main work contents are as follows:
The simulation research on the dynamic characteristic of hydraulic system is carried out by the co-simulation platform which is based on AMESim and Matlab/Simulink. The response characteristic of solenoid valves, the pressure growth characteristic and the pressure drop characteristic of hydraulic system are essfully gained. The theoretical basis will be provided to the experiment research on the dynamic characteristic of hydraulic system.
The testing platform including the testing flat for hydraulic system and the testing system for the dynamic characteristic of hydraulic system are set up. The hardware and software are designed in the testing system. In thi