Design Of Microcomputer Control System For 160km/h AC Transmission Rail Engineering Vehicle

With the development of science and technology and the development of domestic rail transportation,the requirements for railway engineering vehicles are getting higher and higher.AC transmission technology has incomparable advantages over traditional hydraulic transmission and DC transmission.AC transmission locomotives have good starting acceleration performance and resistance braking performance,convenient maintenance,superior traction performance and wide application range.The application of advanced AC transmission experience to railway engineering vehicles is very beneficial to improving the performance and manufacturing level of railway engineering vehicles.The application of AC drive technology in rail engineering vehicles not only improves the comprehensive strength in the field of rail engineering,but also significantly improves the performance index and locomotive design of rail engineering vehicles.Therefore,the design of AC drive rail engineering vehicles is of great significance.This paper mainly focuses on the research on the microcomputer control system of 160km/h AC drive railway engineering vehicle.First of all,by comparing and analyzing the advantages and disadvantages of hydraulic transmission,mechanical transmission and electric transmission,it is proposed that the electric transmission of 160km/h AC transmission rail engineering vehicle adopts AC-DC-AC working mode,and the design and selection basis of traction motor,traction converter,rectifier unit,main generator and diesel engine of main electric transmission system are analyzed.Secondly,according to the function of the microcomputer control system of the railway engineering vehicle,the principle of the hardware design process of the two generation microcomputer control system is analyzed.Although the hardware design of the two generation microcomputer control platform 68 K platform and CPCI platform are different,the functions realized are the same.The design principles of CPU plug-in,digital input plug-in,digital output plug-in and analog plug-in of the two generation microcomputer platform are emphatically analyzed.Then,aiming at the 160km/h AC drive railway engineering vehicle,the software structure design,logic control design,intermediate voltage control design,traction/braking characteristic design,fault diagnosis and protection strategy design of the microcomputer control system are analyzed in detail,wherein the microcomputer control system software is divided into analog acquisition task according to task functions,digital quantity acquisition and logic control task,frequency acquisition and diesel engine speed control task,fault handling control task,excitation control task,power control task,communication data processing task,etc.Finally,this paper analyzes and summarizes the test results of the railway engineering vehicle,and designs a new treatment method for the problems encountered in the test: locomotive traction control adds PID adjustment function of diesel engine load,fault storage adopts polling storage mechanism,fault communication adds fault speed regulation mode or emergency traction treatment strategy,etc.after software optimization,good control effect has been achieved,the operation performance of the railway engineering vehicle has been greatly improved,and a good reference and experience has been provided for the design of other railway engineering vehicles in the future.