毕业设计-汽车制动试验台控制系统设计.docVIP

摘要 在道路交通中,制动对确保行车安全有着重要的作用和意义，一方面是使汽车在任何情况下减速或停车，确保行车的安全；另一方面也是提高汽车的运行速度，提高承载力，即提高道路交通能力的重要手段。 随着计算机软硬件技术的迅猛发展，汽车制动测试系统开始向计算机的方向发展。虚拟仪器(Virtual Instrument)是现代计算机技术、仪器技术以及其他新技术完美结合的产物。利用虚拟仪器技术，工程师只需要将所需的测量信号采集送入计算机，然后再利用计算机的强大分析能力和处理能力，实现对测试数据的显示、存储以及分析处理。本课题研究的虚拟仪器系统采用PC-DAQ技术，以台式电脑和PC-8335A数据采集卡为基本的仪器硬件平台，配合必要的信号调理电路，利用美国NI公司的图形化虚拟仪器编程环境LabView 8.20为开发平台，组成了一个多功能的虚拟仪器测试系统。 论文首先对ABS制动系统以及汽车制动试验台的技术发展，组成部分和硬件设计做了简要的介绍；接着对虚拟仪器的基本概念、组成部分和发展情况进行概述；再对我所设计的ABS制动试验台测控系统的总体设计做详细的说明，接着是测控系统的硬件设计包括：传感器、信号处理、数据采集卡和台式电脑组成的系统硬件设备的功能和设计。LabView 8.20软件设计，以及测控系统操作流程的设计思想。然后根据软件的设计，分析用基于LabView 8.20平台软件编写出的各个功能模块程序，包括了设定参数和开关、采集数据，显示、最终分析模块。 本系统实际运行在Microsoft Windows xp 环境下，实际结果表明，系统的软件、硬件设计可行可靠、易于开发、并且具有良好的可操作性和扩展性，能够适应多种制动产品的性能试验，能较好的满足工业现场环境下的测试任务。 关键词：虚拟仪器；LabView；制动试验台；控制系统 Abstract In the transportation, braking is very important for the security of running the automobile .On one hand, it can slow down or stop the under any situation so as to guarantee the safety in process, on the other hand, it can also acts as an important means to advance the transport capacity of the road, i.e. the capacity to accelerate the automobile and its load. With the swift development of computer hardware technologies, application of a novel visual instrument has been a tendency in the measuring area. By applying Virtual Instrument technology, engineers only need to send the signals to tested into the computers, and then use the great abilities of computing and analyzing to realize data display, data storage and data processing. Based on PC-DAQ technology, a multifunctional Virtual Instrument, which is proposed in this thesis, has the hardware which is mainly based on a desktop computer, one PCI-8335A data acquisition card and necessary signal condition box. Its software is developed by the graphical virtual instrument programming enviroment LabView 8.20,which is produced by NI. This thesis first introduces the technology of the anti-locking system ,and the component of the system. Th