The Development And Design Of Logic Control Unitcriterion For AC Drive Diesel Locomotive

As the speed of our railway transportation our country continues to improve in our country, the requirement of locomotive manipulation is also increasing. However, as traditional diesel locomotive uses electrical control system with contacts; this electrical control system has so many inherent and inevitable defects. For example, the wrong mechanical move of the device with contacts there are so many wires in the control circuit, the universal of the system is poor and there is so much workload for checking. In this design, we use the technology of modern power electrics and micro electrics for making the logic control unit to replace the traditional logic control system. The orders of the microchip can control the devices with the output channels made by power electrics devices; it can avoid driving devices for so many levels. So it can simplify the control circuit of the diesel locomotive, reduce the number of wires, improve the reliability of the system and simplify the control system of the locomotive, shorten the cycle of the design and commissioning. The microchip makes the logic control module had the function for fault judgment, so that improve the safety of the locomotive.In this thesis, the AC drive diesel locomotive electrical control system is analyzed based on the AC diesel shunting lomocotive as the control object. Not only to complete the extraction of input, but also the logic control ladder diagram for the AC drive diesel locomotive is designed according to the locomotive logic control relationships. The feature of AC drive diesel locomotive logic control is given according to the logic control relationships. And the overall structure of the LCU is designed. The logic control unit hardware is divided into two parts, including the central control board and input output board, which are respectively based on TMS320F2812and EPM7128AETC144-5as main control chip. The logic relationship,the input and output signal collecting circuit, amplifying functions and the PCB board have been designed. The logic control unit based on hardware software is completed basedon C language on the CCS3.3platform compiler. The logical operations, the input and output signal processing are completed. The software part is composed of logic control program for the logic control unit, communication program, fault self-diagnosis system. After the logic function completed, the logic control unit of the system reliability is analyzed in fault-tolerance, fault avoidance measures and fault diagnosis measures.