Abstract: At present, outdoor signals are controlled by station computer interlocking system through drive relays. Low-frequency codes are compiled and sent to outdoor rails by some of the relay coding circuits through the contacts of signal relays inside a station. Such low-frequency codes are received by a locomotive for train control through the receiving device of track circuits. Therefore, there is a direct correlation between the timing of drive of a relay as configured by a computer interlocking device and the accuracy of low-frequency codes received by a outdoor locomotive. Such direct correlation is particularly obvious in the coding circuits of the approach sections of computer interlocking stations (the same scenario problem occurs in train control coding of C2 stations connected to existing lines). Abnormal low-frequency codes may be received by a locomotive at some point due to the design of coding circuits in certain typical scenarios. Therefore, it is necessary to identify and optimize the coding circuits of approach sections in such typical scenarios to improve the accuracy and comprehensiveness of the coding of approach sections. This paper summarizes the problem of coordination between circuit designs and the sequences of relay actions driven by computer interlocking by analyzing several typical scenarios. Optimization schemes are proposed to avoid problems in engineering practices in the future

Key words: computer interlocking, relay coding, approach section, repeating relay

摘要： 当前车站计算机联锁系统通过驱动继电器进行对室外信号控制，部分继电编码电路采用站内信号继电器接点编制低频码并输出到室外钢轨，机车通过轨道电路接收装置接收低频码进行列车控制，因而计算机联锁设备对继电器的驱动时机与室外机车准确接收低频码有直接的关联。在计算机联锁车站接近区段的编码电路(与既有线衔接的C2车站列控编码也有同样的场景问题)中，这种直接的关联体现得尤为明显。一些典型场景的编码电路设计可能导致在某种时机下机车接收到异常低频码，因而有必要对此类典型场景中接近区段的编码电路进行明确和优化，以提高接近区段编码的准确性和全面性。通过几个典型场景分析，总结电路设计与计算机联锁驱动继电器动作时序的配合问题，提出优化方案，以求在后续工程实践中避免问题发生

关键词: 计算机联锁, 继电编码, 接近区段, 复示继电器