摘要:简要介绍了DF12 型机车恒低速PLC 控制系统的研究情况、系统构成与功能及工作原理等。装有该系统的机车在神华西部铁路有限公司装煤站的实际使用表明，该系统稳定可靠，使用效果良好。关键词机车恒低速控制PLC DF12 型DF12型机车恒低速控制系统是根据用户（神华西部铁路有限公司）的特殊要求而设计的。要求该机车可在给定的0.8 ～ 3km/ h 低速度范围内恒速运行。为此我们在DF12 型机车的基础上增设了恒低速控制功能。Abstract The system composition，functions，and operational principle as well as the research status of the PLC control system for DF12 locomotives running at constant low speed are introduced. The practical application of the locomotives equipped this system in coal loading station of Shenhua Western Railway Co.，Ltd. is also presented.Keywords Locomotive Constant low speed control PLC DF12
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