【作者】 李平；

【导师】 卢博友；

【作者基本信息】 西北农林科技大学 ， 机械设计及理论， 2007， 硕士

【摘要】 水泵是水冷发动机冷却系统中的核心部件,水泵性能和工作状况的好坏将直接关系到发动机乃至整车的性能及工作状况。综合性能试验是水泵开发设计中主要的测试手段,只有采用先进的测试技术、精确的测量方法和仪器对水泵进行试验,获得精确的试验数据,通过分析试验数据,才能评定水泵工作状况是否满足发动机工作的要求,因此综合试验对水泵的设计、制造至关重要。研究开发自动化程度较高的水泵试验台,对于提高水泵产品质量,促进国内发动机及车辆零部件的发展具有重要意义。本论文针对国家及行业标准、工厂产品试验大纲以及技术条件提出的水泵性能试验要求,以工业计算机和多功能数据采集卡构成控制核心,变频三相异步交流电机作为调速系统带动水泵运转,模拟水泵实际工况;由温度、压力、液位、转速扭矩、流量、电流以及限位传感器等多种传感器和数据采集卡构成信号检测系统,获取试验及试验台相关的数据;控制核心与水箱温度、压力调控及低液位补水、电机变频调速、试验台辅助动作等执行单元一起构成水泵综合试验台硬件系统。按照工厂产品试验大纲、技术条件以及试验工艺规程的要求,本论文采用虚拟仪器的概念开发了基于Lab Windows/CVI的水泵综合试验台自动控制系统和现场试验数据采集分析系统。系统能够按照工艺要求控制试验台准确地完成水泵的性能试验,同时对试验台的压力、温度、液位、转速扭矩、电流、流量等参数进行现场数据采集、处理、分析,并对其进行有效监控。测控软件系统界面友好,具有人机对话、实时监控的功能,为水泵综合试验经济运行提供了可靠的数据。本文创新点:在传统电气手动控制的水泵综合试验台控制系统中引入了计算机控制、虚拟仪器、数据采集和变频调速等先进技术,实现了试验台的自动化控制,不仅提高了试验台的可靠性及水泵试验的灵活性,也大大改善了工作环境,减少了人为因素对试验的影响。更多还原

【Abstract】 The water pump is a core part in the cooling system of the water-cooled engine, and its performance influences the behaviors of the engine directly, even the vehicle. Thus the multipurpose test is the major testing way in the development of the pumps. Only if adopting the advanced technologies, the precise methods and instruments to test the pumps, in order to acquit the accurate testing data, whether the working behavior of the pumps meets the needs of the engine is evaluated through by these data. As a result, the multipurpose test is great important for its design and manufacture. The research of a more automatic testing equipment for the pumps is more significant for heightening the quality of the products and promoting the development of the engines and vehicle components in home.In the view of the requirements for the function test of the pumps, suggested in the specifications and testing outlines and other standards of the industry and the nation, the working behavior of the pumps is imitated, composing the control center with IPC and DAQ cards, the timing speeding system with the frequency conversion three-phases asynchronous motor to drive the pumps. The data, related to the testing and the equipments, could be obtained, in the via of building up the signal monitoring system by DAQ cards and many sensors and transducers. The hard system of the platform is made up of the control center and, the temperature controlling, pressure adjusting, speeding, and any others aid units.According to the requirements from the testing outline, testing procedure and the specification for the products, adopting the concept of VI, the automatic control system, of the multipurpose testing platform for the water pumps, based on Lab Windows/CVI, and the collecting and analyzing system of the locale testing data, were developed. In the light of the procedure, the system could, commanding the platform, accomplish the performance tests exactly for the pumps, collect, process and analyze the locale data of the bed such as the pressures, temperatures, speed, the current and the flow, and control them efficiently. The test-control system has a friendly interface and possesses the functions of the human- machine dialogue and the real-time monitoring, which provide the economical running of the multipurpose test with reliable data.The new ideas: The advanced technology, such as CC, VI, DAQ and frequency-speed, are introduced into the control system of the multipurpose platform for the pumps, which was controlled by the hand movement of the traditional electric method. It carried out the automatic control and simplified the operation to the platform. Not only dose it enhance the reliability and flexibility of the testing and the platform, but also improves the testing environment; moreover, it cut down the effects from individual factors.更多还原