Urban Rail Vehicle Traction / Braking Testing Virtual Platform Development

In order to developing fault testing system in vehicle,the city railcar's electromotor parameters should be tested,collected and disposed in real time,so traction / brake power and electromotor moment can be calculated by ' electrical current,voltage and rotate speed,and so traction / brake trait curve can be protracted. According to this,traction electrsmotor's working status can be got using fuzzy synthesis judge method,which provides bases for realizing electric traction system's fault diagnosis in city railcar.This testing system is composed of collection and transfers singlechip circuits and testing programme in computer. This article describes the methods for designing singlechip circuits,communicate programme and for data collection and fault diagnosis programme by testing software in computer. The singlechip design includes sensor circuits for testing electromotor's electrical current,voltage and rotate speed,and includes data collection board and data communication board,and includes RS-232 and RS-485 communicate mode. LabVIEW,a professional test software,is adopted in making up of virtual instruments. The design of software includes three modules:data communicate module,data calculate module and the instruments panel module used to accepting the command and to displaying the result. In addition,fuzzy synthesis judge method for fault diagnosis in electric traction system is introduced.