Logic controller for railway locomotive

Abstract

The logic controller for railway locomotive consists of main control board, input board, output board and power supply board, and features the bi-directional CAN bus communication among the control board, the input board and the output board, and the MOS FET driving between the output board and the electric device of the locomotive to be controlled. The present invention adopts embedded monochip computer system, CAN bus technology, and cured combination logic software in PLC logic ladder diagram structure easy to read and understand. Adopting logic control unit can simplify the design, production and debugging of locomotive control circuit, and raise the reliability of the control system. In addition, the microcomputer and electronic control system has vibration resistance obviously superior to traditional relay contact control system.

Description

[0001] The invention belongs to a railway locomotive control device, in particular to a railway locomotive logic control device. Background technique [0002] For a long time, the locomotive electrical control circuit has been using the traditional relay contact control circuit. The realization of locomotive logic relationship is accomplished through series and parallel connection of switches, auxiliary contacts of contactors, contacts of intermediate relays, time relays, pressure relays, etc. This kind of circuit has poor reliability in a working environment with a lot of vibration and dust. Especially when the speed of the locomotive increases to above 120KM / h, due to the aggravation of the vibration of the locomotive, the malfunction of the relay contact control system increases significantly. There are many line contacts, the line failure rate is high, and the disadvantages of finding and handling line failures are becoming more and more prominent. ...

AI Technical Summary

Problems solved by technology

This kind of circuit has poor reliability in the working environment with heavy vibration and dust.

Especially when the speed of the locomotive increases above 120KM / h, due to the intensified vibration of the locomotive, the malfunction of the relay contact control system increases significantly

There are many line contacts, the line failure rate is high, and the disadvantages of finding and handling line failures are becoming more and more prominent

[0003] If a programmable logic controller (PLC) is used to replace the traditional relay contact control circuit, but because the locomotive relay contact control circuit has many particularities: the control voltage is DC 110V, and the maximum load current of the relay can reach nearly 5A , poor working environment, etc. According to the IEC standard, the general PLC working voltage is DC24V or AC220V, and the load capacity of the DC output point is relatively low. The multi-level driving method of the 110V intermediate relay driven by the conventional relay does not fundamentally solve the problems such as cumbersome wiring, so the general industrial PLC cannot be directly applied to the locomotive

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