Comparison On Section Occupation Logical Checking Between The Relay Type And The Software Type And Simulation Analysis

The track circuit is a basic device used to reflect the track section being occupied or free. And bad shunting of track circuit in the long-term existence security hidden danger, commonly known as "pressure die". Train track occupancy section, but due to the track circuit lose shunting effect, track relay can not work normally, the track section losing occupancy indication, at this time will likely lead to serious train crash consequences. Every year traffic fault caused by bad shunting accounts for quite high proportion among traffic fault.Section occupation logical checking based on the train in the section running sequential occupancy, clearing track circuit section, can timely judge the track circuit in the section bad shunting such fault, in order to protect and alarm for fault point, prevent subsequent overrunning, for this reason, guaranteeing the safety of train running in the section. Although can not fundamentally solve the Bad Shunting brings security problems, but in a large extent reduces the bad shunting of driving risk. At the same time, the prevention point automatically move forwards and revocation, whick makes the impact of protective function on transportation efficiency to a minimum, is one of the technical scheme is feasible and effective.In this paper, comparing the realization of the section occupation logical checking based on the method of relay circuit and the method of computer software. First, using station unlocking conditions of the "three check" theory to the section, analysis of the train running in the section in a variety of scenarios, through programming to achieve various scenes of block section logical state transfer and deal with traffic range, in order to realize section occupation logical checking based on software. Secondly, based on the specific characteristics of the relay in the relay circuit drawings, analyze the timing relationship between the critical logical checking relay, draw a timing diagram. Again, for a variety of operating the train scene in the section, comparing and analising the technical solutions to software type and relay style and then concluding the advantages and disadvantages of two different schemes. Finally, in the VS2008 environment using VC++ to build the relay type and software type section occupation logical checking simulation platform, whick can simulate a variety of bad shunting scenarios, to compare the two solutions is how to protection and alarm train operation in the section, visually see both the pros and cons for both solutions for the further improvement of reference.