Design and Implementation of a DC Switch Machine Electronic Control Module

Abstract

The electronic interlocking system offers advantages including flexible configuration, reduced cost and space requirements, and simplified debugging and installation compared to traditional relay-based interfaces. In order to realize the electronic control of DC switch, a DC switch machine electronic control module was designed, which adopts two-out-of-two security architecture, and The switch interface unit utilizes a heterogeneous design combining a mechanical contactor and an electronic switch to mitigate common-cause failures. The software, developed in compliance with the EN 50128 standard, comprises five components: initialization, communication control, state machine calculation, driving and application program. Reliability analysis demonstrates that the module meets the requirements for Safety Integrity Level 4 (SIL 4), and has passed a series of experiments. The electronic control module of DC switch has high reliability and availability, and meets the requirements of all-electronic computer interlocking system of rail transit.