基于LabVIEW平台的工程机械故障树和网络诊断系统

工程机械使用工况复杂，系统可靠性要求高，在故障识别和诊断的方法上，利用顶事件与底事件之间的内在关系，采用液晶屏上棒条模拟量显示，加分级声光报警的形式，在专家故障知识库的基础上，建立了工程机械发动机和变速器的故障树，设计了基于虚拟仪器的远程网络监测与诊断系统，提供了在LabVIEW平台下的远程网络监测及故障诊断方法，实现故障巡回检查、故障回放、故障查询、液晶灰度自动调节等功能，为提高工程机械整机系统的可靠性提出了有效的措施。

Network diagnosis and fault tree system of construction machinery based on LabVIEW

The complex working status requires construction machinery having higher reliability. Using the interrelationship between fault phenomena and fault causation, and display simulation bar on LCD, sounding and lighting Mann, the fault tree of gear shift and engine of construction machinery was established on the basis of the expert system. A remote network monitoring and diagnosis system based on Virtual Instruments is presented and the method of remote network monitoring and fault diagnosis based on LabVIEW is given. The functions of fault returning checking, fault re-displaying, fault inquiring, and LCD auto-adjusting are carried out. The research result will be an effective measure of improving system reliability of fault diagnosis of construction machinery.