The development of fault detection and diagnosis system is accomplished with the application of PXI interface technology, modular instrument and signal processing technology. The total technical scheme of host computer, portable test platform, signal adapter unit, test interface and cable together with peripheral components is introduced in the presented system. Consequently, the hardware includes master computer (fault test and diagnosis platform), PXI-bus data acquisition system, signal interface adapter, power supply system, interface unit, connection cable and peripheral dedicated test equipments. And the software is developed by C and LabWindows/CVI based on Win32 operating system. In addition, the modular and object-oriented programming are adopted in the software development. The software consists of three parts: the master program running on test and diagnosis platform, the client software module on signal adapter unit as well as the remote interface software module. It can implement fault detection of electrical system on replaceable circuit board and block of the hydraulic system or electrical system. So it can help equipment repairmen and operator perform quick repairs and maintenance to the electrical system for engineering equipment.
This paper deals with the testing, isolating and diagnosis of construction machinery. Subsequently, the analysis of operating status, faulty mode and running parameter is carried out. The equipment implements the detection, processing, storage and alarming of the operating status parameters, such as temperature of cooling system, oil temperature, oil pressure, engine rotation speed, oil temperature of torque converter as well as oil level of sump and etc. Meanwhile, the real time fault alarm and historical data analysis results can also be performed and illustrated by vivid graphical interface. The embedded ARM microcontroller, which is the core module of the system, manipulates the data acquisition of operating parameters for the construction machinery. Application software of ARM chip processes the operating status parameters and accomplishes alarm and control operations under failure pattern of the machine. The failure data can not only be displayed and alarmed synchronously, but also can be stored for further fault analysis. The equipment can record various types of operating parameters, and is applicable to many different types of engineering vehicles.
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