Fault Diagnosis System of Hydraulic System Using Lab Windows/CVI and Virtual Instrument Technology
Huanliang Li, Xiaoqiang Yang, Yaming Gao

Abstract
Due to the electro-mechanical and electric-hydraulic coupling as well as structure complexity of hydraulic system of engineering equipment, its fault diagnosis is difficult to be implemented. Therefore a novel fault diagnosis system is introduced in this. It consists of host computer, portable test platform, signal adapter unit, test interface and connection cables. Its hardware platform encompasses host computer, universal fault test and diagnosis platform, PXI-bus data acquisition system, signal conditioning circuits, power supply system, interface unit, connection cable and peripheral dedicated test equipments. Ant its software is developed by C and Lab Windows/CVI based on Win32 operating system. The software consists of three parts: the main control and management software module running on test and diagnosis platform, the data acquistion modules operating on signal adapter unit as well as the remote interface software module. The fault diagnosis system can perform fault diagnosis of hydraulic excavator on replaceable circuit board and block of the hydraulic system or electrical system. It can also help equipment repairmen and operator accomplish quick repairs and maintenance for the hydraulic system and electronic control system of military engineering equipment

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