Research And Modification On The Electrical Control System Of The Diesel Locomotive

With the development of modern science and technology, the application of microcomputer technology in industrial automation, industrial intelligent control, and is widely used in the livelihood of the people, It has high efficiency, and other significant characteristics of accurate and humanization. Before the development of electrical railway, in our country is mainly used for steam engines, diesel locomotive, the application of internal combustion locomotive will be mainly used by the diesel-electric passenger, freight and ac/dc power diesel-electric locomotive station shunting locomotive.The amount of type DF4B locomotive attachment, in a lot of diesel locomotive type is the largest. And the model that consumed the most time.Under the technical conditions at the time, DF4B locomotive electric control system is relatively advanced, reliable.But with the rapid development of microcomputer technics. The later stage of such as DF8B、DF11、DF11G Locomotive manufacture are equipped with advanced microcomputer control system. (with full of locomotive logic control, perfect fault diagnosis function of locomotive engine. low fuel consumption of diesel and other advantages).For these reasons, to integrate several main control function of DF4B locomotive, which form a microcomputer centralized control.(This control system includes main circuits, auxiliary circuits, excitation circuits, control circuits etc).New microcomputer control system can improve the locomotive traction performance, to ensure the locomotives to move smoothly (under the different turn speed of diesel machine,and the locomotive running speed, the control of main generator running on the specified characteristic curve, realize power error 1%, give full play to the output power of diesel engine, reduce the diesel engine fuel consumption diesel engine.). Simplify the performance of the locomotives in the state transition, scatter on the locomotive parts function. Make the function of scattered parts of locomotive to integration and intelligent improve the stability modularization.In this thesis, on the basis of the further study of the microcomputer control, using PLC(programmable logic controller)to improve the idea of DF4B locomotive. external control circuit. PLC has high reliability, strong anti-interference,convenient programming, it is the developing direction of industrial automation:at present, the advanced PF11G reconnection locomotive control circuit using the PLC. control technology praetical, application effect is very good.This article is about how DF4B locomotive control circuit designed the concrete PLC reform scheme and programs.After DF4B diesel locomotive microcomputer and PLC control system, have already upgraded, the efficiency of diesel engine is improved obviously, the crew members personnel operating and emergency disposal will be more easy, humanization. locomotive maintenance, debugging cycle will be further compressed to improve the using efficiency of locomotives.